doc: v0.7.0 changelog, update TODO

.gitignore

@@ -1,4 +1,8 @@
 testdata/
-liblcl*
+liblcl-*.zip
+liblcl.so
+liblcl.dll
 yvbolt
 yvbolt.exe
+yvbolt.linux64.tar.xz
+yvbolt.win64.zip

Makefile

@@ -0,0 +1,46 @@
+SHELL:=/bin/bash
+
+SOURCES=$(find . -name '*.go' -type f)
+
+liblcl-2.2.3.zip:
+	rm -f liblcl-2.2.3.zip
+	wget 'https://github.com/ying32/govcl/releases/download/v2.2.3/liblcl-2.2.3.zip'
+	
+liblcl.so: liblcl-2.2.3.zip
+	echo "154b4e4a1d5137a2ffe51cb4d0bf152dd997c12616ae30862775c0e4f0928e88 liblcl-2.2.3.zip" | sha256sum -c
+	rm -f liblcl.so
+	unzip -j liblcl-2.2.3.zip linux64-gtk2/liblcl.so -d .
+	touch liblcl.so
+
+liblcl.dll: liblcl-2.2.3.zip
+	echo "154b4e4a1d5137a2ffe51cb4d0bf152dd997c12616ae30862775c0e4f0928e88 liblcl-2.2.3.zip" | sha256sum -c
+	rm -f liblcl.dll
+	unzip -j liblcl-2.2.3.zip win64/liblcl.dll -d .
+	touch liblcl.dll
+
+yvbolt: $(SOURCES)
+	CGO_CFLAGS='-O2 -Wno-return-local-addr' GOOS=linux GOARCH=amd64 CGO_ENABLED=1 go build -trimpath -ldflags '-s -w'
+	chmod 755 yvbolt
+
+yvbolt.exe: $(SOURCES)
+	CGO_CFLAGS='-O2 -Wno-return-local-addr' GOOS=windows GOARCH=amd64 CGO_ENABLED=1 CC=x86_64-w64-mingw32-gcc-win32 go build -trimpath -ldflags '-s -w -H windowsgui'
+	upx --lzma yvbolt.exe
+
+yvbolt.linux64.tar.xz: yvbolt liblcl.so
+	rm -f yvbolt.linux64.tar.xz
+	XZ_OPT='-T0 -9' tar caf yvbolt.linux64.tar.xz --owner=0 --group=0 yvbolt liblcl.so
+	
+yvbolt.win64.zip: yvbolt.exe liblcl.dll
+	rm -f yvbolt.win64.zip
+	zip -9 yvbolt.win64.zip yvbolt.exe liblcl.dll
+
+.PHONY: dist
+dist: yvbolt.linux64.tar.xz yvbolt.win64.zip
+
+.PHONY: clean
+clean:
+	rm -f yvbolt.exe yvbolt yvbolt.linux64.tar.xz yvbolt.win64.zip
+
+.PHONY: clean-all
+clean-all: clean
+	rm -f liblcl-2.2.3.zip liblcl.so liblcl.dll

README.md

@@ -1,23 +1,30 @@
 # yvbolt
 
-A graphical browser for multiple databases using [GoVCL](https://z-kit.cc/en/).
+A graphical interface for multiple databases using [GoVCL](https://z-kit.cc/en/).
-
-This is an experimental application and you should generally prefer to use [qbolt](https://code.ivysaur.me/qbolt).
 
 ## Features
 
 - Native desktop application, running on Linux, Windows, and macOS
-- Connect to multiple databases
+- Connect to multiple databases at once
 - Browse table/bucket content
+  - Use context menu to perform special table/bucket actions
 - Run custom SQL queries
+  - Select text to run partial query
 - Safe handling for non-UTF8 key and data fields
 - Supported databases:
-  - Bolt
-    - Full compatibility via the upstream [etcd-io/bbolt](https://github.com/etcd-io/bbolt) library
-    - Recursive bucket support
-  - SQLite
-    - Uses CGo if available or modernc.org if not
   - Badger v4
+  - Bolt
+    - Recursive bucket support
+    - Option to open as readonly for shared access
+    - Supports editing
+    - See also [qbolt](https://code.ivysaur.me/qbolt) for more/different functionality
+  - Debconf
+  - Pebble
+  - Redis
+  - SQLite
+    - Drivers: mattn (CGo), modernc.org (no cgo), experimental command-line driver
+    - Supports editing
+    - Integrated vacuum and export commands
 
 ## License
 
@@ -25,7 +32,9 @@ The code in this project is licensed under the ISC license (see `LICENSE` file f
 
 This project redistributes images from the famfamfam/silk icon set under the [CC-BY 2.5 license](http://creativecommons.org/licenses/by/2.5/).
 
-## Usage
+This project includes trademarked logo images for each supported database type.
+
+## Compiling
 
 1. `CGO_ENABLED=1 go build`
 2. [Download liblcl](https://github.com/ying32/govcl/releases/download/v2.2.3/liblcl-2.2.3.zip) for your platform, or [compile it yourself](https://github.com/ying32/liblcl) (tested with v2.2.3)
@@ -34,20 +43,73 @@ This project redistributes images from the famfamfam/silk icon set under the [CC
 
 ## Changelog
 
+2024-07-18 v0.7.0
+
+- SQLite, Bolt: Initial support for editing data (insert, per-cell update, delete)
+- SQLite: Add context menu actions for compact (vacuum), export, and drop table
+- App: New grid widget
+- App: Add refresh button
+- App: Bigger window size, use icons for toolbars, better UI colours for Windows
+- App: Prevent submitting blank queries to database
+- Refactor database interface and error handling
+
+2024-06-30 v0.6.0
+
+- Debconf: Add as supported database
+- SQLite: Support table names containing special characters
+- SQLite: Improvements for experimental command-line driver 
+- Redis: Improve connection dialog window position
+- App: Cosmetic fixes for frame borders, help dialog, and Windows fonts+colours
+- Build: Change compression parameters for release builds
+- Build: Compile CGO with -O2 for release builds
+
+[⬇️ Download for Windows x86_64](https://git.ivysaur.me/code.ivysaur.me/yvbolt/releases/download/v0.6.0/yvbolt.win64.zip)
+
+[⬇️ Download for Linux x86_64](https://git.ivysaur.me/code.ivysaur.me/yvbolt/releases/download/v0.6.0/yvbolt.linux64.tar.xz)
+
+2024-06-29 v0.5.0
+
+- Pebble: Add as supported database
+- Bolt: Support opening as readonly
+- Bolt: Support creating new databases
+- Bolt: Support adding/removing recursive child buckets
+- SQLite: Support custom CLI driver that parses `/usr/bin/sqlite3 -json` output (experimental)
+- Redis: Improve query parser to support quoted strings
+- App: Support refreshing elements in nav tree
+- App: Help menu option to show driver versions
+- App: Add image icons for refresh and close context menu actions
+- Build: Add makefile for cross-compiling release binaries
+
+[⬇️ Download for Windows x86_64](https://git.ivysaur.me/code.ivysaur.me/yvbolt/releases/download/v0.5.0/yvbolt.win64.zip)
+
+[⬇️ Download for Linux x86_64](https://git.ivysaur.me/code.ivysaur.me/yvbolt/releases/download/v0.5.0/yvbolt.linux64.tar.xz)
+
+2024-06-23 v0.4.0
+
+- Redis: Add as supported database
+- Badger: Allow creating in-memory databases
+- App: Allow selecting partial query text to execute
+- App: Allow closing database connections from context menu
+- App: Allow scrolling large content on Properties pane
+- App: Preload recursive navigation
+- App: Automatically switch to selected database when new connection is created
+- App: Add help website link
+- App: Add database logo images
+
 2024-06-25 v0.3.0
 
-- Add support for running custom queries
+- Badger: Add BadgerDB v4 as supported database
-- Add BadgerDB v4 as supported database
+- SQLite: Add support for CGo-free SQLite driver under cross-compilation
-- Add support for CGo-free SQLite driver under cross-compilation
+- Bolt: Update Bolt to v1.4.0-alpha.1
-- Add status bar showing currently selected DB
+- App: Add support for running custom queries
-- Update Bolt to v1.4.0-alpha.1
+- App: Add status bar showing currently selected DB
-- Fix missing icons in nav when selecting items 
+- App: Fix missing icons in nav when selecting items 
-- Fix extra quotemarks when browsing string content of database
+- App: Fix extra quotemarks when browsing string content of database
 
 2024-06-08 v0.2.0
 
-- Add SQLite support (now requires CGo)
+- SQLite: Add SQLite support (now requires CGo)
-- Add images for menu and navigation items
+- App: Add images for menu and navigation items
 
 2024-06-03 v0.1.0
 

TODO

@@ -1,23 +1,41 @@
-- Insert
+- Syntax highlighting in editor
-- Update cell
+- Mutation
-- Delete row(s)
+	- Get real primary key for mutation instead of string approximation
+	- Badger: Support insert/update/delete
+	- Pebble: Support insert/update/delete
+	- Debconf: Support insert/update/delete
+	- Redis: Support insert/update/delete
 - Binary data viewer
 	- Detect jpg/png and show as image
-- Warning if data table is filtered to 1000 rows, or add pagination
 - More DB types
 	- MySQL
 	- Postgres
-	- Redis
+		- CLI using psql
 	- MSSQL (recursive navigation for instances)
+	- Other K/V stores from https://github.com/smallnest/kvbench 
+	- Windows registry
+	- LDAP
+- Connection dialog
 	- SSH tunnels
-- Special actions
+	- Badger encryption key dialog
-	- Refresh tables
+	- Pebble: connection options dialog
-	- Per-db actions e.g. compact, export backup
+- SQLite CLI driver:
-	- Per-table actions e.g. drop table
+	- Context support
-- Sqlite cli driver for ssh tunnel
+	- Attach to SSH tunnel
+	- Configure binary path
 	- https://ricardoanderegg.com/posts/sqlite-remote-explorer-gui/
 	- https://github.com/litements/litexplore
-- Badger encryption key dialog
+- Debconf: separate groups by first slash in name
-- Badger in-memory
+- SQLite: drop table doesn't autorefresh nav since callback is late
-- Makefile to cross-compile release binaries in docker
+- Build
+	- Build own liblcl binaries in docker
 	- Win32 icon resource
+		- https://github.com/ying32/govcl/tree/master/Tools/winRes
+- Performance
+	- Warning if data table is filtered to 1000 rows, or add pagination
+	- Context/interrupt slow queries
+	- Faster virtual rendering
+		- https://github.com/ying32/govcl/blob/master/samples/listviewvirtualdata/main.go
+- Query history
+- Test suite
+	- `CREATE TABLE foo (id integer primary key, aaa text not null, bbb text not null);`

bolt.go

@@ -1,200 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"path/filepath"
-	"sort"
-	"strings"
-	"time"
-	"unsafe"
-
-	"github.com/ying32/govcl/vcl"
-	"github.com/ying32/govcl/vcl/types"
-	"go.etcd.io/bbolt"
-	"go.etcd.io/bbolt/version"
-)
-
-type boltLoadedDatabase struct {
-	displayName string
-	path        string
-	db          *bbolt.DB
-	nav         *vcl.TTreeNode
-
-	arena []*navData // keepalive
-}
-
-func (ld *boltLoadedDatabase) DisplayName() string {
-	return ld.displayName
-}
-
-func (ld *boltLoadedDatabase) DriverName() string {
-	return "Bolt " + version.Version
-}
-
-func (ld *boltLoadedDatabase) RootElement() *vcl.TTreeNode {
-	return ld.nav
-}
-
-func (ld *boltLoadedDatabase) Keepalive(ndata *navData) {
-	ld.arena = append(ld.arena, ndata)
-}
-
-func (ld *boltLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
-
-	// Load properties
-
-	bucketDisplayName := strings.Join(ndata.bucketPath, `/`)
-	content := fmt.Sprintf("Selected database: %#v\n\n\nSelected bucket: %q\n", ld.db.Stats(), bucketDisplayName)
-	f.propertiesBox.SetText(content)
-
-	// Load data
-
-	f.contentBox.SetEnabled(false)
-	f.contentBox.Clear()
-
-	// Bolt always uses Key + Value as the columns
-
-	f.contentBox.Columns().Clear()
-	colKey := f.contentBox.Columns().Add()
-	colKey.SetCaption("Key")
-	colKey.SetWidth(MY_WIDTH)
-	colKey.SetAlignment(types.TaLeftJustify)
-	colVal := f.contentBox.Columns().Add()
-	colVal.SetCaption("Value")
-
-	err := ld.db.View(func(tx *bbolt.Tx) error {
-		b := boltTargetBucket(tx, ndata.bucketPath)
-		if b == nil {
-			// no such bucket
-			return nil
-		}
-
-		// Valid
-		f.contentBox.Clear()
-
-		c := b.Cursor()
-		for k, v := c.First(); k != nil; k, v = c.Next() {
-			dataEntry := f.contentBox.Items().Add()
-			dataEntry.SetCaption(formatUtf8(k))
-			dataEntry.SubItems().Add(formatUtf8(v))
-		}
-		return nil
-	})
-	if err != nil {
-		vcl.ShowMessage(fmt.Sprintf("Failed to load data for bucket %q: %s", bucketDisplayName, err.Error()))
-		return
-	}
-
-	// Valid
-	f.contentBox.SetEnabled(true)
-}
-
-func (ld *boltLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
-	// In the bolt implementation, the nav is a recursive tree of child buckets
-	return boltChildBucketNames(ld.db, ndata.bucketPath)
-}
-
-func (ld *boltLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
-	vcl.ShowMessage("Bolt doesn't support querying")
-}
-
-var _ loadedDatabase = &boltLoadedDatabase{} // interface assertion
-
-//
-
-func (f *TMainForm) boltAddDatabaseFromFile(path string) {
-	// TODO load in background thread to stop blocking the UI
-	db, err := bbolt.Open(path, 0644, &bbolt.Options{Timeout: 1 * time.Second})
-	if err != nil {
-		vcl.ShowMessage(fmt.Sprintf("Failed to load database '%s': %s", path, err.Error()))
-		return
-	}
-
-	ld := &boltLoadedDatabase{
-		path:        path,
-		displayName: filepath.Base(path),
-		db:          db,
-	}
-
-	ld.nav = f.Buckets.Items().Add(nil, ld.displayName)
-	ld.nav.SetHasChildren(true) // dynamically populate in OnNavExpanding
-	ld.nav.SetImageIndex(imgDatabase)
-	ld.nav.SetSelectedIndex(imgDatabase)
-	navData := &navData{
-		ld:             ld,
-		childrenLoaded: false,      // will be loaded dynamically
-		bucketPath:     []string{}, // empty = root
-	}
-	ld.nav.SetData(unsafe.Pointer(navData))
-
-	f.dbs = append(f.dbs, ld)
-
-	ld.Keepalive(navData)
-}
-
-func boltTargetBucket(tx *bbolt.Tx, path []string) *bbolt.Bucket {
-
-	// If we are already deep in buckets, go directly there to find children
-	if len(path) == 0 {
-		return nil
-	}
-
-	b := tx.Bucket([]byte(path[0]))
-	if b == nil {
-		return nil // unexpectedly missing
-	}
-
-	for i := 1; i < len(path); i += 1 {
-		b = b.Bucket([]byte(path[i]))
-		if b == nil {
-			return nil // unexpectedly missing
-		}
-	}
-
-	return b // OK
-}
-
-func boltChildBucketNames(db *bbolt.DB, path []string) ([]string, error) {
-	var nextBucketNames []string
-
-	err := db.View(func(tx *bbolt.Tx) error {
-
-		// If we are already deep in buckets, go directly there to find children
-		if len(path) > 0 {
-			b := tx.Bucket([]byte(path[0]))
-			if b == nil {
-				return fmt.Errorf("Unexpected missing root bucket %q", path[0])
-			}
-
-			for i := 1; i < len(path); i += 1 {
-				b = b.Bucket([]byte(path[i]))
-				if b == nil {
-					return fmt.Errorf("Unexpected missing bucket %q", strings.Join(path[0:i], `/`))
-				}
-			}
-
-			// Find child buckets of this bucket
-			b.ForEachBucket(func(bucketName []byte) error {
-				nextBucketNames = append(nextBucketNames, string(bucketName))
-				return nil
-			})
-
-		} else {
-			// Find root bucket names
-			return tx.ForEach(func(bucketName []byte, _ *bbolt.Bucket) error {
-				nextBucketNames = append(nextBucketNames, string(bucketName))
-				return nil
-			})
-		}
-
-		// OK
-		return nil
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	sort.Strings(nextBucketNames)
-
-	return nextBucketNames, nil
-}

db_badger.go

@@ -7,12 +7,10 @@ import (
 
 	"github.com/dgraph-io/badger/v4"
 	"github.com/ying32/govcl/vcl"
-	"github.com/ying32/govcl/vcl/types"
 )
 
 type badgerLoadedDatabase struct {
 	displayName string
-	path        string
 	db          *badger.DB
 	nav         *vcl.TTreeNode
 
@@ -35,7 +33,7 @@ func (ld *badgerLoadedDatabase) Keepalive(ndata *navData) {
 	ld.arena = append(ld.arena, ndata)
 }
 
-func (ld *badgerLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
+func (ld *badgerLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
 
 	// Load properties
 
@@ -43,25 +41,15 @@ func (ld *badgerLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 	f.propertiesBox.SetText(content)
 
 	// Load data
-
-	f.contentBox.SetEnabled(false)
-	f.contentBox.Clear()
-
 	// Badger always uses Key + Value as the columns
 
-	f.contentBox.Columns().Clear()
 	colKey := f.contentBox.Columns().Add()
-	colKey.SetCaption("Key")
+	colKey.Title().SetCaption("Key")
-	colKey.SetWidth(MY_WIDTH)
-	colKey.SetAlignment(types.TaLeftJustify)
 	colVal := f.contentBox.Columns().Add()
-	colVal.SetCaption("Value")
+	colVal.Title().SetCaption("Value")
 
 	err := ld.db.View(func(txn *badger.Txn) error {
 
-		// Valid
-		f.contentBox.Clear()
-
 		// Create iterator
 		opts := badger.DefaultIteratorOptions
 		opts.PrefetchSize = 64
@@ -72,9 +60,10 @@ func (ld *badgerLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 			item := it.Item()
 			k := item.Key()
 			err := item.Value(func(v []byte) error {
-				dataEntry := f.contentBox.Items().Add()
+				rpos := f.contentBox.RowCount()
-				dataEntry.SetCaption(formatUtf8(k))
+				f.contentBox.SetRowCount(rpos + 1)
-				dataEntry.SubItems().Add(formatUtf8(v))
+				f.contentBox.SetCells(0, rpos, formatUtf8(k))
+				f.contentBox.SetCells(1, rpos, formatUtf8(v))
 
 				return nil
 			})
@@ -85,12 +74,13 @@ func (ld *badgerLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 		return nil
 	})
 	if err != nil {
-		vcl.ShowMessage(fmt.Sprintf("Failed to load data: %s", err.Error()))
+		return err
-		return
 	}
 
 	// Valid
+	vcl_stringgrid_columnwidths(f.contentBox)
 	f.contentBox.SetEnabled(true)
+	return nil
 }
 
 func (ld *badgerLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
@@ -104,28 +94,45 @@ func (ld *badgerLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
 	}
 }
 
-func (ld *badgerLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
+func (ld *badgerLoadedDatabase) NavContext(ndata *navData) ([]contextAction, error) {
-	vcl.ShowMessage("Badger doesn't support querying")
+	return nil, nil // No special actions are supported
+}
+
+func (ld *badgerLoadedDatabase) Close() {
+	_ = ld.db.Close()
+	ld.arena = nil
 }
 
 var _ loadedDatabase = &badgerLoadedDatabase{} // interface assertion
 
 //
 
+func (f *TMainForm) badgerAddDatabaseFromMemory() {
+	f.badgerAddDatabaseFrom(badger.DefaultOptions("").WithInMemory(true))
+}
+
 func (f *TMainForm) badgerAddDatabaseFromDirectory(path string) {
+	f.badgerAddDatabaseFrom(badger.DefaultOptions(path))
+}
+
+func (f *TMainForm) badgerAddDatabaseFrom(opts badger.Options) {
 	// TODO load in background thread to stop blocking the UI
-	db, err := badger.Open(badger.DefaultOptions(path))
+	db, err := badger.Open(opts)
 	if err != nil {
-		vcl.ShowMessage(fmt.Sprintf("Failed to load database '%s': %s", path, err.Error()))
+		vcl.ShowMessage(fmt.Sprintf("Failed to load database: %s", err.Error()))
 		return
 	}
 
 	ld := &badgerLoadedDatabase{
-		path:        path,
-		displayName: filepath.Base(path),
 		db: db,
 	}
 
+	if opts.Dir == "" {
+		ld.displayName = ":memory:" // SQLite-style naming
+	} else {
+		ld.displayName = filepath.Base(opts.Dir)
+	}
+
 	ld.nav = f.Buckets.Items().Add(nil, ld.displayName)
 	ld.nav.SetHasChildren(true) // dynamically populate in OnNavExpanding
 	ld.nav.SetImageIndex(imgDatabase)
@@ -138,6 +145,7 @@ func (f *TMainForm) badgerAddDatabaseFromDirectory(path string) {
 	ld.nav.SetData(unsafe.Pointer(navData))
 
 	f.dbs = append(f.dbs, ld)
+	f.Buckets.SetSelected(ld.nav) // Select new element
 
 	ld.Keepalive(navData)
 }

db_bolt.go

@@ -0,0 +1,309 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"path/filepath"
+	"sort"
+	"strings"
+	"time"
+	"unsafe"
+
+	"github.com/ying32/govcl/vcl"
+	"go.etcd.io/bbolt"
+	"go.etcd.io/bbolt/version"
+)
+
+const (
+	boltFilter = "Bolt database|*.db|All files|*.*"
+)
+
+type boltLoadedDatabase struct {
+	displayName string
+	path        string
+	db          *bbolt.DB
+	nav         *vcl.TTreeNode
+
+	arena []*navData // keepalive
+}
+
+func (ld *boltLoadedDatabase) DisplayName() string {
+	return ld.displayName
+}
+
+func (ld *boltLoadedDatabase) DriverName() string {
+	return "Bolt " + version.Version
+}
+
+func (ld *boltLoadedDatabase) RootElement() *vcl.TTreeNode {
+	return ld.nav
+}
+
+func (ld *boltLoadedDatabase) Keepalive(ndata *navData) {
+	ld.arena = append(ld.arena, ndata)
+}
+
+func (ld *boltLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
+
+	// Load properties
+
+	bucketDisplayName := strings.Join(ndata.bucketPath, `/`)
+	content := fmt.Sprintf("Selected database: %#v\n\n\nSelected bucket: %q\n", ld.db.Stats(), bucketDisplayName)
+	f.propertiesBox.SetText(content)
+
+	// Load data
+	// Bolt always uses Key + Value as the columns
+	colKey := f.contentBox.Columns().Add()
+	colKey.Title().SetCaption("Key")
+	colVal := f.contentBox.Columns().Add()
+	colVal.Title().SetCaption("Value")
+
+	err := ld.db.View(func(tx *bbolt.Tx) error {
+		b := boltTargetBucket(tx, ndata.bucketPath)
+		if b == nil {
+			// no such bucket
+			return nil
+		}
+
+		// Valid
+		c := b.Cursor()
+		for k, v := c.First(); k != nil; k, v = c.Next() {
+			rpos := f.contentBox.RowCount()
+			f.contentBox.SetRowCount(rpos + 1)
+			f.contentBox.SetCells(0, rpos, formatUtf8(k))
+			f.contentBox.SetCells(1, rpos, formatUtf8(v))
+		}
+		return nil
+	})
+	if err != nil {
+		return err
+	}
+
+	// Valid
+	vcl_stringgrid_columnwidths(f.contentBox)
+	f.contentBox.SetEnabled(true)
+	return nil
+}
+
+func (n *boltLoadedDatabase) ApplyChanges(f *TMainForm, ndata *navData) error {
+	if n.db.IsReadOnly() {
+		return errors.New("Database was opened read-only")
+	}
+
+	// We have rendered row IDs, need to convert back to a bolt primary key
+	// TODO stash the real key inside f.contentBox.Objects()
+	// FIXME breaks if you try and edit the primary key(!)
+	primaryKeyForRendered := func(rowid int32) []byte {
+		return []byte(f.contentBox.Cells(0, rowid))
+	}
+
+	return n.db.Update(func(tx *bbolt.Tx) error {
+
+		// Get current bucket handle
+		b := boltTargetBucket(tx, ndata.bucketPath)
+
+		// Edit
+		for rowid, _ /*editcells*/ := range f.updateRows {
+			k := primaryKeyForRendered(rowid)
+			v := f.contentBox.Cells(1, rowid) // There's only one value cell
+			err := b.Put(k, []byte(v))
+			if err != nil {
+				return fmt.Errorf("Updating cell %q: %w", formatUtf8(k), err)
+			}
+		}
+
+		// Delete by key (affects rowids after re-render)
+		for rowid, _ := range f.deleteRows {
+			k := primaryKeyForRendered(rowid)
+			err := b.Delete(k)
+			if err != nil {
+				return fmt.Errorf("Deleting cell %q: %w", formatUtf8(k), err)
+			}
+		}
+
+		// Insert all new entries
+		for rowid, _ := range f.insertRows {
+			k := primaryKeyForRendered(rowid)
+			v := f.contentBox.Cells(1, rowid) // There's only one value cell
+			err := b.Put(k, []byte(v))
+			if err != nil {
+				return fmt.Errorf("Inserting cell %q: %w", formatUtf8(k), err)
+			}
+		}
+
+		// Done
+		return nil
+	})
+}
+
+func (ld *boltLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
+	// In the bolt implementation, the nav is a recursive tree of child buckets
+	return boltChildBucketNames(ld.db, ndata.bucketPath)
+}
+
+func (ld *boltLoadedDatabase) NavContext(ndata *navData) (ret []contextAction, err error) {
+	ret = append(ret, contextAction{"Add bucket...", ld.AddChildBucket})
+
+	if len(ndata.bucketPath) > 0 {
+		ret = append(ret, contextAction{"Delete bucket", ld.DeleteBucket})
+	}
+
+	return
+}
+
+func (ld *boltLoadedDatabase) AddChildBucket(sender vcl.IComponent, ndata *navData) error {
+	bucketName := ""
+	if !vcl.InputQuery(APPNAME, "Enter a name for the new bucket:", &bucketName) {
+		return nil // cancel
+	}
+
+	err := ld.db.Update(func(tx *bbolt.Tx) error {
+		parent := boltTargetBucket(tx, ndata.bucketPath)
+		if parent != nil {
+			_, err := parent.CreateBucket([]byte(bucketName))
+			return err
+		}
+
+		// Top-level
+		_, err := tx.CreateBucket([]byte(bucketName))
+		return err
+	})
+	if err != nil {
+		return fmt.Errorf("Error adding bucket: %w", err)
+	}
+	return nil
+}
+
+func (ld *boltLoadedDatabase) DeleteBucket(sender vcl.IComponent, ndata *navData) error {
+	err := ld.db.Update(func(tx *bbolt.Tx) error {
+		// Find parent of this bucket.
+		if len(ndata.bucketPath) >= 2 {
+			// child bucket
+			parent := boltTargetBucket(tx, ndata.bucketPath[0:len(ndata.bucketPath)-1])
+			return parent.DeleteBucket([]byte(ndata.bucketPath[len(ndata.bucketPath)-1]))
+		} else {
+			// top-level bucket
+			return tx.DeleteBucket([]byte(ndata.bucketPath[0]))
+		}
+	})
+	if err != nil {
+		return fmt.Errorf("Error deleting bucket %q: %w", strings.Join(ndata.bucketPath, `/`), err)
+	}
+	return nil
+}
+
+func (ld *boltLoadedDatabase) Close() {
+	_ = ld.db.Close()
+	ld.arena = nil
+}
+
+var _ loadedDatabase = &boltLoadedDatabase{} // interface assertion
+
+//
+
+func (f *TMainForm) boltAddDatabaseFromFile(path string, readonly bool) {
+	// TODO load in background thread to stop blocking the UI
+
+	opts := bbolt.Options{
+		Timeout:  1 * time.Second,
+		ReadOnly: readonly,
+	}
+
+	db, err := bbolt.Open(path, 0644, &opts)
+	if err != nil {
+		vcl.ShowMessage(fmt.Sprintf("Failed to load database '%s': %s", path, err.Error()))
+		return
+	}
+
+	ld := &boltLoadedDatabase{
+		path:        path,
+		displayName: filepath.Base(path),
+		db:          db,
+	}
+	if readonly {
+		ld.displayName += " (read-only)"
+	}
+
+	ld.nav = f.Buckets.Items().Add(nil, ld.displayName)
+	ld.nav.SetHasChildren(true) // dynamically populate in OnNavExpanding
+	ld.nav.SetImageIndex(imgDatabase)
+	ld.nav.SetSelectedIndex(imgDatabase)
+	navData := &navData{
+		ld:             ld,
+		childrenLoaded: false,      // will be loaded dynamically
+		bucketPath:     []string{}, // empty = root
+	}
+	ld.nav.SetData(unsafe.Pointer(navData))
+
+	f.dbs = append(f.dbs, ld)
+	f.Buckets.SetSelected(ld.nav) // Select new element
+
+	ld.Keepalive(navData)
+}
+
+func boltTargetBucket(tx *bbolt.Tx, path []string) *bbolt.Bucket {
+
+	// If we are already deep in buckets, go directly there to find children
+	if len(path) == 0 {
+		return nil
+	}
+
+	b := tx.Bucket([]byte(path[0]))
+	if b == nil {
+		return nil // unexpectedly missing
+	}
+
+	for i := 1; i < len(path); i += 1 {
+		b = b.Bucket([]byte(path[i]))
+		if b == nil {
+			return nil // unexpectedly missing
+		}
+	}
+
+	return b // OK
+}
+
+func boltChildBucketNames(db *bbolt.DB, path []string) ([]string, error) {
+	var nextBucketNames []string
+
+	err := db.View(func(tx *bbolt.Tx) error {
+
+		// If we are already deep in buckets, go directly there to find children
+		if len(path) > 0 {
+			b := tx.Bucket([]byte(path[0]))
+			if b == nil {
+				return fmt.Errorf("Root bucket %q: %w", path[0], ErrNavNotExist)
+			}
+
+			for i := 1; i < len(path); i += 1 {
+				b = b.Bucket([]byte(path[i]))
+				if b == nil {
+					return fmt.Errorf("Bucket %q: %w", strings.Join(path[0:i], `/`), ErrNavNotExist)
+				}
+			}
+
+			// Find child buckets of this bucket
+			b.ForEachBucket(func(bucketName []byte) error {
+				nextBucketNames = append(nextBucketNames, string(bucketName))
+				return nil
+			})
+
+		} else {
+			// Find root bucket names
+			return tx.ForEach(func(bucketName []byte, _ *bbolt.Bucket) error {
+				nextBucketNames = append(nextBucketNames, string(bucketName))
+				return nil
+			})
+		}
+
+		// OK
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	sort.Strings(nextBucketNames)
+
+	return nextBucketNames, nil
+}

db_debconf.go

@@ -0,0 +1,132 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"unsafe"
+
+	"yvbolt/debconf"
+
+	"github.com/ying32/govcl/vcl"
+)
+
+type debconfLoadedDatabase struct {
+	displayName string
+	db          *debconf.Database
+	nav         *vcl.TTreeNode
+
+	arena []*navData // keepalive
+}
+
+func (ld *debconfLoadedDatabase) DisplayName() string {
+	return ld.displayName
+}
+
+func (ld *debconfLoadedDatabase) DriverName() string {
+	return "debconf"
+}
+
+func (ld *debconfLoadedDatabase) RootElement() *vcl.TTreeNode {
+	return ld.nav
+}
+
+func (ld *debconfLoadedDatabase) Keepalive(ndata *navData) {
+	ld.arena = append(ld.arena, ndata)
+}
+
+func (ld *debconfLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
+
+	// Load properties
+
+	content := fmt.Sprintf("Entries: %d\nUnique attributes: %d\n", len(ld.db.Entries), len(ld.db.AllColumnNames))
+	f.propertiesBox.SetText(content)
+
+	// Load data
+
+	indexes := make(map[string]int)
+
+	for i, cname := range ld.db.AllColumnNames {
+		indexes[cname] = i
+
+		col := f.contentBox.Columns().Add()
+		col.Title().SetCaption(cname)
+	}
+
+	for _, entry := range ld.db.Entries {
+
+		rpos := f.contentBox.RowCount()
+		f.contentBox.SetRowCount(rpos + 1)
+		f.contentBox.SetCells(0, rpos, entry.Name)
+
+		for _, proppair := range entry.Properties {
+			f.contentBox.SetCells(int32(indexes[proppair[0]]), rpos, proppair[1])
+		}
+	}
+
+	// Valid
+	vcl_stringgrid_columnwidths(f.contentBox)
+	f.contentBox.SetEnabled(true)
+	return nil
+}
+
+func (ld *debconfLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
+	// In the debconf implementation, there is only one child: "Data"
+	if len(ndata.bucketPath) == 0 {
+		return []string{"Data"}, nil
+
+	} else {
+		// No children deeper than that
+		return []string{}, nil
+	}
+}
+
+func (ld *debconfLoadedDatabase) NavContext(ndata *navData) ([]contextAction, error) {
+	return nil, nil // No special actions are supported
+}
+
+func (ld *debconfLoadedDatabase) Close() {
+	ld.arena = nil
+}
+
+var _ loadedDatabase = &debconfLoadedDatabase{} // interface assertion
+
+//
+
+func (f *TMainForm) debconfAddDatabaseFrom(path string) {
+	// TODO load in background thread to stop blocking the UI
+
+	fh, err := os.OpenFile(path, os.O_RDONLY, 0400)
+	if err != nil {
+		vcl.ShowMessage(fmt.Sprintf("Failed to load database: %s", err.Error()))
+		return
+	}
+	defer fh.Close()
+
+	db, err := debconf.Parse(fh)
+	if err != nil {
+		vcl.ShowMessage(fmt.Sprintf("Failed to load database: %s", err.Error()))
+		return
+	}
+
+	ld := &debconfLoadedDatabase{
+		db:          db,
+		displayName: filepath.Base(path),
+	}
+
+	ld.nav = f.Buckets.Items().Add(nil, ld.displayName)
+	ld.nav.SetHasChildren(true) // dynamically populate in OnNavExpanding
+	ld.nav.SetImageIndex(imgDatabase)
+	ld.nav.SetSelectedIndex(imgDatabase)
+	navData := &navData{
+		ld:             ld,
+		childrenLoaded: false,      // will be loaded dynamically
+		bucketPath:     []string{}, // empty = root
+	}
+	ld.nav.SetData(unsafe.Pointer(navData))
+
+	f.dbs = append(f.dbs, ld)
+	f.Buckets.SetSelected(ld.nav) // Select new element
+
+	ld.Keepalive(navData)
+}

db_none.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"github.com/ying32/govcl/vcl"
+)
+
+type noLoadedDatabase struct{}
+
+func (n *noLoadedDatabase) DisplayName() string {
+	return APPNAME
+}
+
+func (n *noLoadedDatabase) DriverName() string {
+	return "No database selected"
+}
+
+func (n *noLoadedDatabase) RootElement() *vcl.TTreeNode {
+	return nil
+}
+
+func (n *noLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
+	f.propertiesBox.SetText("Open a database to get started...")
+	return nil
+}
+
+func (n *noLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
+	return []string{}, nil
+}
+
+func (ld *noLoadedDatabase) NavContext(ndata *navData) ([]contextAction, error) {
+	return nil, nil // No special actions are supported
+}
+
+func (n *noLoadedDatabase) Keepalive(ndata *navData) {
+}
+
+func (n *noLoadedDatabase) Close() {}

db_pebble.go

@@ -0,0 +1,134 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"path/filepath"
+	"unsafe"
+
+	"github.com/cockroachdb/pebble"
+	"github.com/cockroachdb/pebble/vfs"
+	"github.com/ying32/govcl/vcl"
+)
+
+type pebbleLoadedDatabase struct {
+	displayName string
+	db          *pebble.DB
+	nav         *vcl.TTreeNode
+
+	arena []*navData // keepalive
+}
+
+func (ld *pebbleLoadedDatabase) DisplayName() string {
+	return ld.displayName
+}
+
+func (ld *pebbleLoadedDatabase) DriverName() string {
+	return "Pebble " + version_Pebble // Parsed from embedded go.mod copy
+}
+
+func (ld *pebbleLoadedDatabase) RootElement() *vcl.TTreeNode {
+	return ld.nav
+}
+
+func (ld *pebbleLoadedDatabase) Keepalive(ndata *navData) {
+	ld.arena = append(ld.arena, ndata)
+}
+
+func (ld *pebbleLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
+
+	ctx := context.Background()
+
+	// Load properties
+
+	content := fmt.Sprintf("Pebble metrics: %#v", ld.db.Metrics())
+	f.propertiesBox.SetText(content)
+
+	// Load data
+	// pebble always uses Key + Value as the columns
+
+	colKey := f.contentBox.Columns().Add()
+	colKey.Title().SetCaption("Key")
+	colVal := f.contentBox.Columns().Add()
+	colVal.Title().SetCaption("Value")
+
+	itr := ld.db.NewIterWithContext(ctx, nil)
+	defer itr.Close()
+
+	for itr.First(); itr.Valid(); itr.Next() {
+		k := itr.Key()
+		v, err := itr.ValueAndErr()
+		if err != nil {
+			return fmt.Errorf("Failed to load data for key %q: %w", formatAny(k), err)
+		}
+
+		rpos := f.contentBox.RowCount()
+		f.contentBox.SetRowCount(rpos + 1)
+		f.contentBox.SetCells(0, rpos, formatUtf8(k))
+		f.contentBox.SetCells(0, rpos, formatUtf8(v))
+	}
+
+	// Valid
+	vcl_stringgrid_columnwidths(f.contentBox)
+	f.contentBox.SetEnabled(true)
+	return nil
+}
+
+func (ld *pebbleLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
+	// In the pebble implementation, there is only one child: "Data"
+	if len(ndata.bucketPath) == 0 {
+		return []string{"Data"}, nil
+
+	} else {
+		// No children deeper than that
+		return []string{}, nil
+	}
+}
+
+func (ld *pebbleLoadedDatabase) NavContext(ndata *navData) ([]contextAction, error) {
+	return nil, nil // No special actions are supported
+}
+
+func (ld *pebbleLoadedDatabase) Close() {
+	_ = ld.db.Close()
+	ld.arena = nil
+}
+
+var _ loadedDatabase = &pebbleLoadedDatabase{} // interface assertion
+
+//
+
+func (f *TMainForm) pebbleAddDatabaseFromMemory() {
+	f.pebbleAddDatabaseFrom("", &pebble.Options{FS: vfs.NewMem()})
+}
+
+func (f *TMainForm) pebbleAddDatabaseFrom(dirname string, opts *pebble.Options) {
+	// TODO load in background thread to stop blocking the UI
+
+	db, err := pebble.Open(dirname, opts)
+	if err != nil {
+		vcl.ShowMessage(fmt.Sprintf("Failed to load database: %s", err.Error()))
+		return
+	}
+
+	ld := &pebbleLoadedDatabase{
+		db:          db,
+		displayName: filepath.Base(dirname),
+	}
+
+	ld.nav = f.Buckets.Items().Add(nil, ld.displayName)
+	ld.nav.SetHasChildren(true) // dynamically populate in OnNavExpanding
+	ld.nav.SetImageIndex(imgDatabase)
+	ld.nav.SetSelectedIndex(imgDatabase)
+	navData := &navData{
+		ld:             ld,
+		childrenLoaded: false,      // will be loaded dynamically
+		bucketPath:     []string{}, // empty = root
+	}
+	ld.nav.SetData(unsafe.Pointer(navData))
+
+	f.dbs = append(f.dbs, ld)
+	f.Buckets.SetSelected(ld.nav) // Select new element
+
+	ld.Keepalive(navData)
+}

db_redis.go

@@ -0,0 +1,280 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"strconv"
+	"unsafe"
+
+	"yvbolt/lexer"
+
+	"github.com/redis/go-redis/v9"
+	"github.com/ying32/govcl/vcl"
+)
+
+type redisLoadedDatabase struct {
+	displayName string
+	db          *redis.Client
+	nav         *vcl.TTreeNode
+
+	currentDb     int
+	maxDb         int
+	serverVersion string // populated at connection-time from INFO command
+
+	arena []*navData // keepalive
+}
+
+func (ld *redisLoadedDatabase) DisplayName() string {
+	return ld.displayName
+}
+
+func (ld *redisLoadedDatabase) DriverName() string {
+	return "Redis " + ld.serverVersion
+}
+
+func (ld *redisLoadedDatabase) RootElement() *vcl.TTreeNode {
+	return ld.nav
+}
+
+func (ld *redisLoadedDatabase) Keepalive(ndata *navData) {
+	ld.arena = append(ld.arena, ndata)
+}
+
+func (ld *redisLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
+	ctx := context.Background()
+
+	if len(ndata.bucketPath) == 0 {
+		// Top-level: Show info() on main Properties tab
+		infostr, err := ld.db.Info(ctx).Result()
+		if err != nil {
+			return fmt.Errorf("Retreiving database info: %w", err)
+		}
+
+		f.propertiesBox.SetText(infostr)
+
+		// Leave data tab disabled (default behaviour)
+		return nil
+
+	} else if len(ndata.bucketPath) == 1 {
+		// One selected database
+		// Figure out its content
+		err := ld.db.Do(ctx, "SELECT", ndata.bucketPath[0]).Err()
+		if err != nil {
+			return fmt.Errorf("Switching to database %q: %w", ndata.bucketPath[0], err)
+		}
+
+		allKeys, err := ld.db.Keys(ctx, "*").Result()
+		if err != nil {
+			return fmt.Errorf("Listing keys in database %q: %w", ndata.bucketPath[0], err)
+		}
+
+		f.propertiesBox.SetText(fmt.Sprintf("Database %s\nTotal keys: %d\n", ndata.bucketPath[0], len(allKeys)))
+
+		// Redis always uses Key + Value as the columns
+
+		colKey := f.contentBox.Columns().Add()
+		colKey.Title().SetCaption("Key")
+		colType := f.contentBox.Columns().Add()
+		colType.Title().SetCaption("Type")
+		colVal := f.contentBox.Columns().Add()
+		colVal.Title().SetCaption("Value")
+
+		for _, key := range allKeys {
+			typeName, err := ld.db.Type(ctx, key).Result()
+			if err != nil {
+				return fmt.Errorf("Loading %q/%q: %w", ndata.bucketPath[0], key, err)
+			}
+
+			rpos := f.contentBox.RowCount()
+			f.contentBox.SetRowCount(rpos + 1)
+			f.contentBox.SetCells(0, rpos, formatUtf8([]byte(key)))
+			f.contentBox.SetCells(1, rpos, typeName)
+
+			switch typeName {
+			case "string":
+				val, err := ld.db.Get(ctx, key).Result()
+				if err != nil {
+					return fmt.Errorf("Loading %q/%q: %w", ndata.bucketPath[0], key, err)
+				}
+				f.contentBox.SetCells(2, rpos, val)
+
+			case "hash":
+				val, err := ld.db.HGetAll(ctx, key).Result()
+				if err != nil {
+					return fmt.Errorf("Loading %q/%q: %w", ndata.bucketPath[0], key, err)
+				}
+				// It's a map[string]string
+				f.contentBox.SetCells(2, rpos, formatAny(val))
+
+			case "lists":
+				fallthrough
+			case "sets":
+				fallthrough
+			case "sorted sets":
+				fallthrough
+			case "stream":
+				fallthrough
+
+			default:
+				f.contentBox.SetCells(2, rpos, "<<<other object type>>>")
+			}
+
+		}
+
+		// Valid
+		vcl_stringgrid_columnwidths(f.contentBox)
+		f.contentBox.SetEnabled(true)
+		return nil
+
+	} else {
+		return fmt.Errorf("Unexpected nav position %q", ndata.bucketPath)
+
+	}
+}
+
+func (ld *redisLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
+	// ctx := context.Background()
+
+	if len(ndata.bucketPath) == 0 {
+		// Top-level: list of all child databases (usually 16x)
+		ret := make([]string, 0, ld.maxDb)
+		for i := 0; i < ld.maxDb; i++ {
+			ret = append(ret, fmt.Sprintf("%d", i))
+		}
+		return ret, nil
+
+	} else if len(ndata.bucketPath) == 1 {
+		// One selected database
+		// No child keys underneath it
+		return []string{}, nil
+
+	} else {
+		return nil, fmt.Errorf("Unexpected nav position %q", ndata.bucketPath)
+
+	}
+}
+
+func (ld *redisLoadedDatabase) NavContext(ndata *navData) ([]contextAction, error) {
+	return nil, nil // No special actions are supported
+}
+
+func (ld *redisLoadedDatabase) ExecQuery(query string, resultArea *vcl.TStringGrid) error {
+	ctx := context.Background()
+
+	// Need to parse the query into separate string+args fields for the protocol
+	fields, err := lexer.Fields(query)
+	if err != nil {
+		return fmt.Errorf("Parsing the query: %w", err)
+	}
+
+	fields_boxed := box_interface(fields)
+
+	ret, err := ld.db.Do(ctx, fields_boxed...).Result()
+	if err != nil {
+		return fmt.Errorf("The redis query returned an error: %w", err)
+	}
+
+	vcl_stringgrid_clear(resultArea)
+
+	colVal := resultArea.Columns().Add()
+	colVal.Title().SetCaption("Result")
+
+	// The result is probably a single value or a string slice
+	switch ret := ret.(type) {
+	case []string:
+		// Multiple values
+		for _, single := range ret {
+
+			rpos := resultArea.RowCount()
+			resultArea.SetRowCount(rpos + 1)
+			resultArea.SetCells(0, rpos, formatUtf8([]byte(single)))
+		}
+
+	default:
+		// Single value
+		rpos := resultArea.RowCount()
+		resultArea.SetRowCount(rpos + 1)
+		resultArea.SetCells(0, rpos, formatAny(ret)) // formatUtf8
+
+	}
+
+	vcl_stringgrid_columnwidths(resultArea)
+	resultArea.SetEnabled(true)
+
+	return nil
+}
+
+func (ld *redisLoadedDatabase) Close() {
+	_ = ld.db.Close()
+	ld.arena = nil
+}
+
+var _ loadedDatabase = &redisLoadedDatabase{} // interface assertion
+
+//
+
+func (f *TMainForm) redisConnect(opts *redis.Options) {
+	// TODO load in background thread to stop blocking the UI
+	ctx := context.Background()
+
+	ld := &redisLoadedDatabase{
+		displayName:   opts.Addr,
+		currentDb:     0,
+		maxDb:         1,
+		serverVersion: "<unknown>",
+	}
+
+	// Patch in a hook to remember current DB after keepalive reconnection
+	opts.DB = 0 // Default
+	opts.OnConnect = func(ctx context.Context, cn *redis.Conn) error {
+		return cn.Select(ctx, ld.currentDb).Err()
+	}
+
+	// NewClient doesn't necessarily connect, so it can't throw an err
+	ld.db = redis.NewClient(opts)
+
+	// Make an INFO request (mandatory)
+	info, err := ld.db.InfoMap(ctx).Result()
+	if err != nil {
+		vcl.ShowMessage(fmt.Sprintf("Failed to connect to Redis server: During INFO: %v", err))
+		return
+	}
+
+	if serverInfo, ok := info["Server"]; ok {
+		if v, ok := serverInfo["redis_version"]; ok {
+			ld.serverVersion = v
+		}
+	}
+
+	// List available databases (usually 1..16) with "0" as default
+	// If this fails, probably the target redis does not support multiple databases
+	// (e.g. Redis Cluster). Assume max=0.
+	if maxDatabases, err := ld.db.ConfigGet(ctx, "databases").Result(); err == nil {
+		// Got a result. Must parse it
+		m, err := strconv.ParseInt(maxDatabases["databases"], 10, 64)
+		if err != nil {
+			vcl.ShowMessage(fmt.Sprintf("Failed to connect to Redis server: During CONFIG GET databases: %v", err))
+			return
+		}
+
+		ld.maxDb = int(m)
+	}
+
+	// Done with setup
+
+	ld.nav = f.Buckets.Items().Add(nil, ld.displayName)
+	ld.nav.SetHasChildren(true) // dynamically populate in OnNavExpanding
+	ld.nav.SetImageIndex(imgDatabase)
+	ld.nav.SetSelectedIndex(imgDatabase)
+	navData := &navData{
+		ld:             ld,
+		childrenLoaded: false,      // will be loaded dynamically
+		bucketPath:     []string{}, // empty = root
+	}
+	ld.nav.SetData(unsafe.Pointer(navData))
+
+	f.dbs = append(f.dbs, ld)
+	f.Buckets.SetSelected(ld.nav) // Select new element
+
+	ld.Keepalive(navData)
+}

db_sqlite.go

@@ -0,0 +1,443 @@
+package main
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+	"path/filepath"
+	"strings"
+	"unsafe"
+
+	_ "yvbolt/sqliteclidriver"
+
+	"github.com/ying32/govcl/vcl"
+)
+
+const (
+	sqliteTablesCaption = "Tables"
+	sqliteFilter        = "SQLite database|*.db;*.db3;*.sqlite;*.sqlite3|All files|*.*"
+)
+
+type sqliteLoadedDatabase struct {
+	displayName string
+	path        string
+	db          *sql.DB
+	nav         *vcl.TTreeNode
+
+	arena []*navData // keepalive
+}
+
+func (ld *sqliteLoadedDatabase) DisplayName() string {
+	return ld.displayName
+}
+
+func (ld *sqliteLoadedDatabase) RootElement() *vcl.TTreeNode {
+	return ld.nav
+}
+
+func (ld *sqliteLoadedDatabase) Keepalive(ndata *navData) {
+	ld.arena = append(ld.arena, ndata)
+}
+
+func (ld *sqliteLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
+
+	if len(ndata.bucketPath) == 0 {
+		// Top-level
+		f.propertiesBox.SetText("Please select...")
+		return nil
+
+	} else if len(ndata.bucketPath) == 1 {
+		// Category (tables, ...)
+		f.propertiesBox.SetText("Please select...")
+		return nil
+
+	} else if len(ndata.bucketPath) == 2 && ndata.bucketPath[0] == sqliteTablesCaption {
+		// Render for specific table
+		tableName := ndata.bucketPath[1]
+
+		// Get some basic properties
+		r := ld.db.QueryRow(`SELECT sql FROM sqlite_schema WHERE name = ?;`, tableName)
+		var schemaStmt string
+		err := r.Scan(&schemaStmt)
+		if err != nil {
+			schemaStmt = fmt.Sprintf("* Failed to describe table %q: %s", tableName, err.Error())
+		}
+
+		// Display table properties
+		f.propertiesBox.SetText(fmt.Sprintf("Selected table %q\n\nSchema:\n\n%s", tableName, schemaStmt))
+
+		// Load column details
+		// Use SELECT form instead of common PRAGMA table_info so we can just get names
+		// We could possibly get this from the main data select, but this will
+		// work even when there are 0 results
+		columnNames, err := ld.sqliteGetColumnNamesForTable(tableName)
+		if err != nil {
+			return fmt.Errorf("Failed to load columns for table %q: %w", tableName)
+		}
+
+		populateColumns(columnNames, f.contentBox)
+
+		// Select count(*) so we know to display a warning if there are too many entries
+		// TODO
+
+		// Select * with small limit
+		datar, err := ld.db.Query(`SELECT * FROM "` + tableName + `" LIMIT 1000`) // WARNING can't prepare this parameter, but it comes from the DB (trusted)
+		if err != nil {
+			return fmt.Errorf("Failed to load data for table %q: %w", tableName, err)
+		}
+		defer datar.Close()
+		populateRows(datar, f.contentBox)
+
+		// We successfully populated the data grid
+		vcl_stringgrid_columnwidths(f.contentBox)
+		f.contentBox.SetEnabled(true)
+		return nil
+
+	} else {
+		// ??? unknown
+		return errors.New("?")
+
+	}
+
+}
+
+func (ld *sqliteLoadedDatabase) sqliteGetColumnNamesForTable(tableName string) ([]string, error) {
+	colr, err := ld.db.Query(`SELECT name FROM pragma_table_info( ? )`, tableName)
+	if err != nil {
+		return nil, fmt.Errorf("Query: %w", err)
+	}
+	defer colr.Close()
+
+	var ret []string
+
+	for colr.Next() {
+
+		var columnName string
+		err = colr.Scan(&columnName)
+		if err != nil {
+			return nil, fmt.Errorf("Scan: %w", colr.Err())
+		}
+
+		ret = append(ret, columnName)
+	}
+	if colr.Err() != nil {
+		return nil, colr.Err()
+	}
+
+	return ret, nil
+}
+
+func populateColumns(names []string, dest *vcl.TStringGrid) {
+	for _, columnName := range names {
+		col := dest.Columns().Add()
+		col.Title().SetCaption(columnName)
+	}
+}
+
+func populateRows(rr *sql.Rows, dest *vcl.TStringGrid) {
+
+	numColumns := int(dest.Columns().Count())
+
+	for rr.Next() {
+		fields := make([]interface{}, numColumns)
+		pfields := make([]interface{}, numColumns)
+		for i := 0; i < numColumns; i += 1 {
+			pfields[i] = &fields[i]
+		}
+
+		err := rr.Scan(pfields...)
+		if err != nil {
+			vcl.ShowMessageFmt("Failed to load data: %s", err.Error())
+			return
+		}
+
+		rpos := dest.RowCount()
+		dest.SetRowCount(rpos + 1)
+		for i := 0; i < len(fields); i += 1 {
+			dest.SetCells(int32(i), rpos, formatAny(fields[i]))
+		}
+
+	}
+	if rr.Err() != nil {
+		vcl.ShowMessageFmt("Failed to load data: %s", rr.Err().Error())
+		return
+	}
+}
+
+func (ld *sqliteLoadedDatabase) ExecQuery(query string, resultArea *vcl.TStringGrid) error {
+	rr, err := ld.db.Query(query)
+	if err != nil {
+		return err
+	}
+
+	defer rr.Close()
+
+	vcl_stringgrid_clear(resultArea)
+
+	columns, err := rr.Columns()
+	if err != nil {
+		return err
+	}
+
+	populateColumns(columns, resultArea)
+
+	populateRows(rr, resultArea)
+
+	vcl_stringgrid_columnwidths(resultArea)
+	resultArea.SetEnabled(true)
+	return nil
+}
+
+func (n *sqliteLoadedDatabase) ApplyChanges(f *TMainForm, ndata *navData) (retErr error) {
+
+	if len(ndata.bucketPath) != 2 {
+		return errors.New("invalid selection")
+	}
+	tableName := ndata.bucketPath[1]
+
+	// We have rendered row IDs, need to convert back to an SQLite primary key
+	// TODO stash the real key inside f.contentBox.Objects()
+	// FIXME breaks if you try and edit the primary key(!)
+
+	ctx := context.Background()
+
+	tx, err := n.db.BeginTx(ctx, nil)
+	if err != nil {
+		return err
+	}
+
+	var commitOK bool = false
+	defer func() {
+		if !commitOK {
+			err := tx.Rollback()
+			if err != nil {
+				retErr = err
+			}
+		}
+	}()
+
+	// Data grid properties
+	var columnNames []string
+	for i := int32(0); i < f.contentBox.ColCount(); i++ {
+		columnNames = append(columnNames, f.contentBox.Columns().Items(i).Title().Caption())
+	}
+
+	// Query sqlite table metadata to determine which of these is the PRIMARY KEY
+	var primaryColumnName string
+	err = tx.QueryRowContext(ctx, `SELECT l.name FROM pragma_table_info(?) as l WHERE l.pk = 1;`, tableName).Scan(&primaryColumnName)
+	if err != nil {
+		return fmt.Errorf("Finding primary key for update: %w", err)
+	}
+
+	// Convert it to an index
+	var primaryColumnIdx int = -1
+	for i := 0; i < len(columnNames); i++ {
+		if columnNames[i] == primaryColumnName {
+			primaryColumnIdx = i
+			break
+		}
+	}
+	if primaryColumnIdx == -1 {
+		return fmt.Errorf("Primary key %q missing from available columns", primaryColumnName)
+	}
+
+	// SQLite can only LIMIT 1 on update/delete if it was compiled with
+	// SQLITE_ENABLE_UPDATE_DELETE_LIMIT, which isn't the case for the mattn
+	// cgo library
+	// Skip that, and just rely on primary key uniqueness
+
+	// Edit
+	for rowid, editcells := range f.updateRows {
+		stmt := `UPDATE "` + tableName + `" SET `
+		params := []interface{}{} // FIXME reinstate types for the driver (although SQLite doesn't mind)
+
+		for ct, cell := range editcells {
+			if ct > 0 {
+				stmt += `, `
+			}
+			stmt += `"` + columnNames[cell] + `" = ?`
+			params = append(params, f.contentBox.Cells(cell, rowid))
+		}
+		stmt += ` WHERE "` + primaryColumnName + `" = ?`
+		pkVal := f.contentBox.Cells(int32(primaryColumnIdx), rowid)
+		params = append(params, pkVal)
+
+		_, err = tx.ExecContext(ctx, stmt, params...)
+		if err != nil {
+			return fmt.Errorf("Updating row %q: %w", pkVal, err)
+		}
+	}
+
+	// Delete by key (affects rowids after re-render)
+	for rowid, _ := range f.deleteRows {
+		pkVal := f.contentBox.Cells(int32(primaryColumnIdx), rowid)
+
+		stmt := `DELETE FROM "` + tableName + `" WHERE "` + primaryColumnName + `" = ?`
+
+		_, err = tx.ExecContext(ctx, stmt, pkVal)
+		if err != nil {
+			return fmt.Errorf("Deleting row %q: %w", pkVal, err)
+		}
+	}
+
+	// Insert all new entries
+	for rowid, _ := range f.insertRows {
+		stmt := `INSERT INTO "` + tableName + `" (` + strings.Join(columnNames, `, `) + `) VALUES (`
+		params := []interface{}{} // FIXME reinstate types for the driver (although SQLite doesn't mind)
+
+		for colid := 0; colid < len(columnNames); colid++ {
+			if colid > 0 {
+				stmt += `, `
+			}
+			stmt += "?"
+			params = append(params, f.contentBox.Cells(int32(colid), rowid))
+		}
+		stmt += `)`
+
+		_, err = tx.ExecContext(ctx, stmt, params...)
+		if err != nil {
+			return fmt.Errorf("Inserting row: %w", err)
+		}
+	}
+
+	err = tx.Commit()
+	if err != nil {
+		return err
+	}
+
+	commitOK = true // no need for rollback
+	return nil
+}
+
+func (ld *sqliteLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
+
+	if len(ndata.bucketPath) == 0 {
+		// The top-level children are always:
+		return []string{sqliteTablesCaption}, nil
+	}
+
+	if len(ndata.bucketPath) == 1 && ndata.bucketPath[0] == sqliteTablesCaption {
+		rr, err := ld.db.Query(`SELECT name FROM sqlite_master WHERE type='table' ORDER BY name ASC;`)
+		if err != nil {
+			return nil, err
+		}
+		defer rr.Close()
+
+		var gather []string
+		for rr.Next() {
+			var tableName string
+			err = rr.Scan(&tableName)
+			if err != nil {
+				return nil, err
+			}
+
+			gather = append(gather, tableName)
+		}
+		if rr.Err() != nil {
+			return nil, rr.Err()
+		}
+
+		return gather, nil
+	}
+
+	if len(ndata.bucketPath) == 2 {
+		return nil, nil // Never any deeper children
+	}
+
+	return nil, fmt.Errorf("unknown nav path %#v", ndata.bucketPath)
+}
+
+func (ld *sqliteLoadedDatabase) NavContext(ndata *navData) (ret []contextAction, err error) {
+
+	if len(ndata.bucketPath) == 0 {
+		ret = append(ret, contextAction{"Compact database", ld.CompactDatabase})
+		ret = append(ret, contextAction{"Export backup...", ld.ExportBackup})
+	}
+	if len(ndata.bucketPath) == 2 {
+		ret = append(ret, contextAction{"Drop table", ld.DropTable})
+	}
+	return
+}
+
+func (ld *sqliteLoadedDatabase) CompactDatabase(sender vcl.IComponent, ndata *navData) error {
+	_, err := ld.db.Exec(`VACUUM;`)
+	return err
+}
+
+func (ld *sqliteLoadedDatabase) ExportBackup(sender vcl.IComponent, ndata *navData) error {
+	// Popup for output file
+	dlg := vcl.NewSaveDialog(sender)
+	dlg.SetTitle("Save backup as...")
+	dlg.SetFilter(sqliteFilter)
+	ret := dlg.Execute() // Fake blocking
+	if !ret {
+		return nil // cancelled
+	}
+
+	_, err := ld.db.Exec(`VACUUM INTO ?`, dlg.FileName())
+	return err
+}
+
+func (ld *sqliteLoadedDatabase) DropTable(sender vcl.IComponent, ndata *navData) error {
+	if len(ndata.bucketPath) != 2 {
+		return errors.New("Invalid selection")
+	}
+
+	//
+
+	tableName := ndata.bucketPath[1]
+
+	if !vcl_confirm_dialog(sender, "Drop table", fmt.Sprintf("Are you sure you want to drop the table %q?", tableName)) {
+		return nil // cancelled
+	}
+
+	_, err := ld.db.Exec(`DROP TABLE "` + tableName + `"`) // WARNING can't prepare this parameter, but it comes from the DB (trusted)
+	return err
+}
+
+func (ld *sqliteLoadedDatabase) Close() {
+	_ = ld.db.Close()
+	ld.arena = nil
+}
+
+var _ loadedDatabase = &sqliteLoadedDatabase{} // interface assertion
+
+//
+
+func (f *TMainForm) sqliteAddDatabaseFromFile(path string, cliDriver bool) {
+
+	driver := "sqlite3"
+	if cliDriver {
+		driver = "sqliteclidriver"
+	}
+
+	// TODO load in background thread to stop blocking the UI
+	db, err := sql.Open(driver, path)
+	if err != nil {
+		vcl.ShowMessage(fmt.Sprintf("Failed to load database '%s': %s", path, err.Error()))
+		return
+	}
+
+	ld := &sqliteLoadedDatabase{
+		path:        path,
+		displayName: filepath.Base(path),
+		db:          db,
+	}
+
+	ld.nav = f.Buckets.Items().Add(nil, ld.displayName)
+	ld.nav.SetImageIndex(imgDatabase)
+	ld.nav.SetSelectedIndex(imgDatabase)
+	ld.nav.SetHasChildren(true) // dynamically populate in OnNavExpanding
+	navData := &navData{
+		ld:             ld,
+		childrenLoaded: false,      // will be loaded dynamically
+		bucketPath:     []string{}, // empty = root
+	}
+	ld.nav.SetData(unsafe.Pointer(navData))
+
+	f.dbs = append(f.dbs, ld)
+	f.Buckets.SetSelected(ld.nav) // Select new element
+
+	ld.Keepalive(navData)
+}

db_sqlite_cgo.go

@@ -3,10 +3,16 @@
 package main
 
 import (
+	"yvbolt/sqliteclidriver"
+
 	sqlite3 "github.com/mattn/go-sqlite3"
 )
 
 func (ld *sqliteLoadedDatabase) DriverName() string {
+	if _, ok := ld.db.Driver().(*sqliteclidriver.SCDriver); ok {
+		return "SQLite (sqliteclidriver)"
+	}
+
 	ver1, _, _ := sqlite3.Version()
 	return "SQLite " + ver1
 }

db_sqlite_nocgo.go

@@ -3,9 +3,15 @@
 package main
 
 import (
+	"yvbolt/sqliteclidriver"
+
 	_ "modernc.org/sqlite"
 )
 
 func (ld *sqliteLoadedDatabase) DriverName() string {
+	if _, ok := ld.db.Driver().(*sqliteclidriver.SCDriver); ok {
+		return "SQLite (sqliteclidriver)"
+	}
+
 	return "SQLite (modernc.org)"
 }

debconf/debconf.go

@@ -0,0 +1,94 @@
+package debconf
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"strings"
+)
+
+const (
+	DefaultConfigDat    = `/var/cache/debconf/config.dat`
+	DefaultPasswordsDat = `/var/cache/debconf/passwords.dat`
+	DefaultTemplatesDat = `/var/cache/debconf/templates.dat`
+)
+
+type Entry struct {
+	Name       string
+	Properties [][2]string
+}
+
+type Database struct {
+	Entries        []Entry
+	AllColumnNames []string
+}
+
+func Parse(r io.Reader) (*Database, error) {
+	sc := bufio.NewScanner(r)
+
+	var entries []Entry
+	var wip Entry
+	var linenum int = 0
+
+	knownColumnNames := map[string]struct{}{
+		"Name": struct{}{},
+	}
+	var discoveredColumns []string = []string{"Name"}
+
+	for sc.Scan() {
+		linenum++
+		line := sc.Text()
+
+		if line == "" {
+			if wip.Name != "" {
+				entries = append(entries, wip)
+				wip = Entry{}
+			}
+			continue
+		}
+
+		if line[0] == ' ' {
+			// continuation of last text entry
+			if len(wip.Properties) == 0 {
+				return nil, fmt.Errorf("Continuation of nonexistent entry on line %d", linenum)
+			}
+
+			wip.Properties[len(wip.Properties)-1][1] += line[1:]
+
+		} else {
+			// New pair on current element
+			key, rest, ok := strings.Cut(line, `:`)
+			if !ok {
+				return nil, fmt.Errorf("Missing : on line %d", linenum)
+			}
+
+			if _, ok := knownColumnNames[key]; !ok {
+				knownColumnNames[key] = struct{}{}
+				discoveredColumns = append(discoveredColumns, key)
+			}
+
+			rest = strings.TrimLeft(rest, " \t")
+
+			if key == `Name` {
+				wip.Name = rest
+			} else {
+				wip.Properties = append(wip.Properties, [2]string{key, rest})
+			}
+
+		}
+
+	}
+
+	if sc.Err() != nil {
+		return nil, sc.Err()
+	}
+
+	if wip.Name != "" {
+		entries = append(entries, wip)
+	}
+
+	return &Database{
+		Entries:        entries,
+		AllColumnNames: discoveredColumns,
+	}, nil
+}

debconf/debconf_test.go

@@ -0,0 +1,30 @@
+package debconf
+
+import (
+	"os"
+	"testing"
+)
+
+func TestDebconfParse(t *testing.T) {
+	src, err := os.Open(DefaultConfigDat)
+	if err != nil {
+		if os.IsNotExist(err) {
+			t.Skip(err)
+		}
+		t.Fatal(err)
+	}
+	defer src.Close()
+
+	db, err := Parse(src)
+	if err != nil {
+		t.Fatalf("Parse: %v", err)
+	}
+
+	if len(db.Entries) == 0 {
+		t.Errorf("expected >0 entries, got %v", len(db.Entries))
+	}
+
+	if len(db.AllColumnNames) == 0 {
+		t.Errorf("expected >0 column names, got %v", len(db.AllColumnNames))
+	}
+}

go.mod

@@ -3,36 +3,59 @@ module yvbolt
 go 1.19
 
 require (
+	github.com/cockroachdb/pebble v1.0.0
 	github.com/dgraph-io/badger/v4 v4.2.0
+	github.com/google/uuid v1.6.0
 	github.com/mattn/go-sqlite3 v1.14.22
+	github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c
+	github.com/redis/go-redis/v9 v9.5.3
+	github.com/stretchr/testify v1.9.0
 	github.com/ying32/govcl v2.2.3+incompatible
 	go.etcd.io/bbolt v1.4.0-alpha.1
 	modernc.org/sqlite v1.24.0
 )
 
 require (
+	github.com/DataDog/zstd v1.4.5 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/cockroachdb/errors v1.11.3 // indirect
+	github.com/cockroachdb/logtags v0.0.0-20230118201751-21c54148d20b // indirect
+	github.com/cockroachdb/redact v1.1.5 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dgraph-io/ristretto v0.1.1 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/getsentry/sentry-go v0.27.0 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/glog v1.0.0 // indirect
-	github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6 // indirect
+	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
-	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
-	github.com/golang/snappy v0.0.3 // indirect
+	github.com/golang/snappy v0.0.4 // indirect
 	github.com/google/flatbuffers v1.12.1 // indirect
-	github.com/google/uuid v1.3.0 // indirect
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
-	github.com/klauspost/compress v1.12.3 // indirect
+	github.com/klauspost/compress v1.16.0 // indirect
-	github.com/mattn/go-isatty v0.0.16 // indirect
+	github.com/kr/pretty v0.3.1 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/mattn/go-isatty v0.0.17 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/prometheus/client_golang v1.12.0 // indirect
+	github.com/prometheus/client_model v0.2.1-0.20210607210712-147c58e9608a // indirect
+	github.com/prometheus/common v0.32.1 // indirect
+	github.com/prometheus/procfs v0.7.3 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/rogpeppe/go-internal v1.9.0 // indirect
 	go.opencensus.io v0.22.5 // indirect
-	golang.org/x/mod v0.3.0 // indirect
+	golang.org/x/exp v0.0.0-20230626212559-97b1e661b5df // indirect
-	golang.org/x/net v0.7.0 // indirect
+	golang.org/x/mod v0.18.0 // indirect
+	golang.org/x/net v0.23.0 // indirect
 	golang.org/x/sys v0.19.0 // indirect
-	golang.org/x/tools v0.0.0-20210106214847-113979e3529a // indirect
+	golang.org/x/text v0.14.0 // indirect
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	golang.org/x/tools v0.13.0 // indirect
-	google.golang.org/protobuf v1.28.1 // indirect
+	google.golang.org/protobuf v1.33.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 	lukechampine.com/uint128 v1.2.0 // indirect
 	modernc.org/cc/v3 v3.40.0 // indirect
 	modernc.org/ccgo/v3 v3.16.13 // indirect

go.sum

@@ -1,9 +1,71 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
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+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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@@ -13,126 +75,492 @@ github.com/dgraph-io/ristretto v0.1.1 h1:6CWw5tJNgpegArSHpNHJKldNeq03FQCwYvfMVWa
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 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
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 google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
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 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
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 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
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+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 lukechampine.com/uint128 v1.2.0 h1:mBi/5l91vocEN8otkC5bDLhi2KdCticRiwbdB0O+rjI=
 lukechampine.com/uint128 v1.2.0/go.mod h1:c4eWIwlEGaxC/+H1VguhU4PHXNWDCDMUlWdIWl2j1gk=
 modernc.org/cc/v3 v3.40.0 h1:P3g79IUS/93SYhtoeaHW+kRCIrYaxJ27MFPv+7kaTOw=
@@ -157,3 +585,6 @@ modernc.org/tcl v1.15.2 h1:C4ybAYCGJw968e+Me18oW55kD/FexcHbqH2xak1ROSY=
 modernc.org/token v1.0.1 h1:A3qvTqOwexpfZZeyI0FeGPDlSWX5pjZu9hF4lU+EKWg=
 modernc.org/token v1.0.1/go.mod h1:UGzOrNV1mAFSEB63lOFHIpNRUVMvYTc6yu1SMY/XTDM=
 modernc.org/z v1.7.3 h1:zDJf6iHjrnB+WRD88stbXokugjyc0/pB91ri1gO6LZY=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=

images.go

@@ -10,17 +10,33 @@ import (
 var assetsFs embed.FS
 
 const (
-	imgChartBar int32 = iota
+	imgAdd int32 = iota
+	imgArrowRefresh
+	imgChartBar
 	imgDatabase
 	imgDatabaseAdd
 	imgDatabaseDelete
 	imgDatabaseLightning
 	imgDatabaseSave
+	imgDelete
 	imgLightning
+	imgLightningGo
+	imgPencil
+	imgPencilAdd
+	imgPencilDelete
+	imgPencilGo
+	imgResultsetNext
 	imgTable
 	imgTableAdd
 	imgTableDelete
 	imgTableSave
+	imgVendorCockroach
+	imgVendorDebian
+	imgVendorDgraph
+	imgVendorGithub
+	imgVendorMySQL
+	imgVendorRedis
+	imgVendorSqlite
 )
 
 func loadImages(owner vcl.IComponent) *vcl.TImageList {
@@ -40,17 +56,36 @@ func loadImages(owner vcl.IComponent) *vcl.TImageList {
 	}
 
 	ilist := vcl.NewImageList(owner)
+
+	// ls assets | sort | sed -re 's~(.+)~ilist.Add(mustLoad("assets/\1"), nil)~'
+	ilist.Add(mustLoad("assets/add.png"), nil)
+	ilist.Add(mustLoad("assets/arrow_refresh.png"), nil)
 	ilist.Add(mustLoad("assets/chart_bar.png"), nil)
 	ilist.Add(mustLoad("assets/database.png"), nil)
 	ilist.Add(mustLoad("assets/database_add.png"), nil)
 	ilist.Add(mustLoad("assets/database_delete.png"), nil)
 	ilist.Add(mustLoad("assets/database_lightning.png"), nil)
 	ilist.Add(mustLoad("assets/database_save.png"), nil)
+	ilist.Add(mustLoad("assets/delete.png"), nil)
 	ilist.Add(mustLoad("assets/lightning.png"), nil)
+	ilist.Add(mustLoad("assets/lightning_go.png"), nil)
+	ilist.Add(mustLoad("assets/pencil.png"), nil)
+	ilist.Add(mustLoad("assets/pencil_add.png"), nil)
+	ilist.Add(mustLoad("assets/pencil_delete.png"), nil)
+	ilist.Add(mustLoad("assets/pencil_go.png"), nil)
+	ilist.Add(mustLoad("assets/resultset_next.png"), nil)
 	ilist.Add(mustLoad("assets/table.png"), nil)
 	ilist.Add(mustLoad("assets/table_add.png"), nil)
 	ilist.Add(mustLoad("assets/table_delete.png"), nil)
 	ilist.Add(mustLoad("assets/table_save.png"), nil)
+	ilist.Add(mustLoad("assets/vendor_cockroach.png"), nil)
+	ilist.Add(mustLoad("assets/vendor_debian.png"), nil)
+	ilist.Add(mustLoad("assets/vendor_dgraph.png"), nil)
+	ilist.Add(mustLoad("assets/vendor_github.png"), nil)
+	ilist.Add(mustLoad("assets/vendor_mysql.png"), nil)
+	ilist.Add(mustLoad("assets/vendor_redis.png"), nil)
+	ilist.Add(mustLoad("assets/vendor_sqlite.png"), nil)
+
 	return ilist
 
 }

lexer/lexer.go

@@ -0,0 +1,155 @@
+package lexer
+
+import (
+	"fmt"
+	"strings"
+)
+
+func isWhitespace(r byte) bool {
+	return (r == ' ' || r == '\t' || r == '\r' || r == '\n')
+}
+
+func Quote(input string) string {
+	return `"` + strings.ReplaceAll(strings.ReplaceAll(input, `\`, `\\`), `"`, `\"`) + `"`
+}
+
+// Fields splits a string into separate tokens using something kind of vaguely
+// like how SQL would do it.
+// The result still includes the quote and backslash characters.
+func Fields(input string) ([]string, error) {
+
+	const (
+		StateToplevel           = 0
+		StateWhitespace         = 1
+		StateInDoubleQuote      = 2
+		StateInDoubleQuoteSlash = 3
+		StateInSingleQuote      = 4
+		StateInSingleQuoteSlash = 5
+	)
+
+	var (
+		ret   []string
+		state int = StateToplevel
+		wip   string
+	)
+
+	for pos := 0; pos < len(input); pos++ {
+		c := input[pos]
+
+		switch state {
+
+		case StateToplevel:
+			if isWhitespace(c) {
+				state = StateWhitespace
+				if len(wip) != 0 {
+					ret = append(ret, wip)
+					wip = ""
+				}
+
+			} else if c == '"' {
+				if len(wip) != 0 {
+					return nil, fmt.Errorf(`Unexpected " at char %d`, pos)
+				}
+
+				wip += string(c)
+				state = StateInDoubleQuote
+
+			} else if c == '\'' {
+				if len(wip) != 0 {
+					return nil, fmt.Errorf(`Unexpected ' at char %d`, pos)
+				}
+
+				wip += string(c)
+				state = StateInSingleQuote
+
+			} else if c == '\\' {
+				return nil, fmt.Errorf(`Unexpected \ at char %d`, pos)
+
+			} else if c == '(' || c == ')' || c == '?' || c == ',' || c == '+' || c == '*' || c == '-' || c == '/' || c == '%' || c == ';' || c == '=' {
+				// Tokenize separately, even if they appear touching another top-level token
+				// Should still be safe to re-join
+				if len(wip) != 0 {
+					ret = append(ret, wip)
+					wip = ""
+				}
+				ret = append(ret, string(c))
+
+			} else {
+				wip += string(c)
+			}
+
+		case StateWhitespace:
+			if isWhitespace(c) {
+				// continue
+			} else {
+				state = StateToplevel
+				pos-- // reparse
+			}
+
+		case StateInDoubleQuote:
+			if c == '"' {
+				wip += string(c)
+				ret = append(ret, wip)
+				wip = ""
+				state = StateToplevel
+
+			} else if c == '\\' {
+				wip += string(c)
+				state = StateInDoubleQuoteSlash
+
+			} else {
+				wip += string(c)
+			}
+
+		case StateInDoubleQuoteSlash:
+			if isWhitespace(c) {
+				return nil, fmt.Errorf(`Unexpected whitespace after \ at char %d`, pos)
+
+			} else {
+				wip += string(c)
+				state = StateInDoubleQuote
+			}
+
+		case StateInSingleQuote:
+			if c == '\'' {
+				wip += string(c)
+				ret = append(ret, wip)
+				wip = ""
+				state = StateToplevel
+
+			} else if c == '\\' {
+				wip += string(c)
+				state = StateInSingleQuoteSlash
+
+			} else {
+				wip += string(c)
+			}
+
+		case StateInSingleQuoteSlash:
+			if isWhitespace(c) {
+				return nil, fmt.Errorf(`Unexpected whitespace after \ at char %d`, pos)
+
+			} else {
+				wip += string(c)
+				state = StateInSingleQuote
+			}
+		}
+
+	}
+
+	// Reached the end of input stream
+	switch state {
+	case StateToplevel:
+		if len(wip) > 0 {
+			ret = append(ret, wip)
+			wip = ""
+		}
+		return ret, nil
+
+	case StateWhitespace:
+		return ret, nil
+
+	default:
+		return nil, fmt.Errorf(`Unexpected end of quoted input`)
+	}
+}

lexer/lexer_test.go

@@ -0,0 +1,125 @@
+package lexer
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestLexer(t *testing.T) {
+	type testCase struct {
+		input     string
+		expect    []string
+		expectErr bool
+	}
+
+	cases := []testCase{
+
+		testCase{
+			input:     "foo bar baz",
+			expect:    []string{"foo", "bar", "baz"},
+			expectErr: false,
+		},
+
+		// Quotes
+
+		testCase{
+			input:     `foo "bar" baz`,
+			expect:    []string{"foo", `"bar"`, "baz"},
+			expectErr: false,
+		},
+		testCase{
+			input:     `foo "bar baz" quux`,
+			expect:    []string{"foo", `"bar baz"`, "quux"},
+			expectErr: false,
+		},
+		testCase{
+			input:     `foo 'bar baz' quux`,
+			expect:    []string{"foo", `'bar baz'`, "quux"},
+			expectErr: false,
+		},
+
+		// Escape characters
+
+		testCase{
+			input:     `foo 'bar \n baz' quux`,
+			expect:    []string{"foo", `'bar \n baz'`, "quux"},
+			expectErr: false,
+		},
+		testCase{
+			input:     `foo "bar\"" baz`,
+			expect:    []string{"foo", `"bar\""`, "baz"},
+			expectErr: false,
+		},
+
+		// Collapsing whitespace
+
+		testCase{
+			input:     "   foo    bar   \r\t\n baz\n",
+			expect:    []string{"foo", "bar", "baz"},
+			expectErr: false,
+		},
+
+		// Special characters lexed as separate tokens, but only at top level
+
+		testCase{
+			input:     `3+5*(2.3/6);`,
+			expect:    []string{"3", `+`, "5", "*", "(", "2.3", "/", "6", ")", ";"},
+			expectErr: false,
+		},
+		testCase{
+			input:     `SELECT "3+5*(2.3/6)" AS expression;`,
+			expect:    []string{"SELECT", `"3+5*(2.3/6)"`, "AS", "expression", ";"},
+			expectErr: false,
+		},
+		testCase{
+			input:     `INSERT INTO foo (bar, baz) VALUES (?, ?);`,
+			expect:    []string{"INSERT", "INTO", "foo", "(", "bar", ",", "baz", ")", "VALUES", "(", "?", ",", "?", ")", ";"},
+			expectErr: false,
+		},
+
+		// Errors
+
+		testCase{
+			input:     `foo "bar`,
+			expect:    nil,
+			expectErr: true, // mismatched quotes
+		},
+		testCase{
+			input:     `foo 'bar`,
+			expect:    nil,
+			expectErr: true, // mismatched quotes
+		},
+		testCase{
+			input:     `foo \"bar"`,
+			expect:    nil,
+			expectErr: true, // invalid top-level escape
+		},
+		testCase{
+			input:     `foo "bar\ "`,
+			expect:    nil,
+			expectErr: true, // escaping nothing
+		},
+	}
+
+	for _, tc := range cases {
+		out, err := Fields(tc.input)
+
+		if err != nil {
+			if !tc.expectErr {
+				t.Errorf("Test %q got error %v, expected nil", tc.input, err)
+			}
+
+		} else {
+
+			if tc.expectErr {
+				t.Errorf("Test %q got error <nil>, expected error", tc.input)
+				continue
+			}
+
+			if !reflect.DeepEqual(out, tc.expect) {
+				t.Errorf("Test %q\n- got:     %#v\n- expected %#v", tc.input, out, tc.expect)
+			}
+		}
+
+	}
+}

loadedDatabase.go

@@ -1,18 +1,36 @@
 package main
 
 import (
+	"errors"
+
 	"github.com/ying32/govcl/vcl"
 )
 
+var ErrNavNotExist error = errors.New("The selected item no longer exists")
+
+type contextAction struct {
+	Name     string
+	Callback func(sender vcl.IComponent, ndata *navData) error
+}
+
 // loadedDatabase is a DB-agnostic interface for each loaded database.
 type loadedDatabase interface {
 	DisplayName() string
 	DriverName() string
 	RootElement() *vcl.TTreeNode
-	RenderForNav(f *TMainForm, ndata *navData)
+	RenderForNav(f *TMainForm, ndata *navData) error
-	ExecQuery(query string, resultArea *vcl.TListView)
 	NavChildren(ndata *navData) ([]string, error)
+	NavContext(ndata *navData) ([]contextAction, error)
 	Keepalive(ndata *navData)
+	Close()
+}
+
+type queryableLoadedDatabase interface {
+	ExecQuery(query string, resultArea *vcl.TStringGrid) error
+}
+
+type editableLoadedDatabase interface {
+	ApplyChanges(f *TMainForm, ndata *navData) error
 }
 
 // navData is the .Data() pointer for each TTreeNode in the left-hand tree.

main.go

@@ -1,19 +1,27 @@
 package main
 
 import (
+	"errors"
 	"fmt"
+	"runtime"
+	"runtime/debug"
 	"strings"
 	"unsafe"
 
-	_ "github.com/ying32/govcl/pkgs/winappres" // Extra _syso files for Windows
+	"github.com/pkg/browser"
 	"github.com/ying32/govcl/vcl"
 	"github.com/ying32/govcl/vcl/types"
+	"github.com/ying32/govcl/vcl/types/colors"
 )
 
 const (
-	MY_SPACING = 6
+	APPNAME      = "yvbolt"
-	MY_HEIGHT  = 90
+	HOMEPAGE_URL = "https://code.ivysaur.me/yvbolt"
-	MY_WIDTH   = 180
+
+	CO_INSERT        = colors.ClYellow
+	CO_EDIT_IMPLICIT = colors.ClLightgreen
+	CO_EDIT_EXPLICIT = colors.ClGreen
+	CO_DELETE        = colors.ClRed
 )
 
 type TMainForm struct {
@@ -21,14 +29,26 @@ type TMainForm struct {
 
 	ImageList *vcl.TImageList
 	Menu      *vcl.TMainMenu
+
+	SQLiteUseCliDriver *vcl.TMenuItem
+
 	StatusBar     *vcl.TStatusBar
 	Buckets       *vcl.TTreeView
 	Tabs          *vcl.TPageControl
 	propertiesBox *vcl.TMemo
-	contentBox    *vcl.TListView
+	contentBox    *vcl.TStringGrid
-	queryInput    *vcl.TMemo
+	dataInsertBtn *vcl.TToolButton
-	queryResult   *vcl.TListView
+	dataDelRowBtn *vcl.TToolButton
+	dataCommitBtn *vcl.TToolButton
+	isEditing     bool
+	insertRows    map[int32]struct{} // Rows in the StringGrid that are to-be-inserted
+	deleteRows    map[int32]struct{}
+	updateRows    map[int32][]int32 // Row->cells that are to-be-updated
+	queryExecBtn  *vcl.TToolButton
+	queryInput    *vcl.TRichEdit
+	queryResult   *vcl.TStringGrid
 
+	none *noLoadedDatabase
 	dbs  []loadedDatabase
 }
 
@@ -43,40 +63,81 @@ func main() {
 func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	f.ImageList = loadImages(f)
 
-	f.SetCaption("yvbolt")
+	f.SetCaption(APPNAME)
+	f.ScreenCenter()
+	f.SetWidth(1280)
+	f.SetHeight(640)
 	f.ImageList.GetIcon(imgDatabaseLightning, f.Icon())
 
 	mnuFile := vcl.NewMenuItem(f)
 	mnuFile.SetCaption("File")
 
-	mnuFileOpen := vcl.NewMenuItem(mnuFile)
+	//
-	mnuFileOpen.SetCaption("Open Bolt database...")
-	mnuFileOpen.SetImageIndex(imgDatabaseAdd)
-	mnuFileOpen.SetShortCutFromString("Ctrl+O")
-	mnuFileOpen.SetOnClick(f.OnMnuFileOpenClick)
-	mnuFile.Add(mnuFileOpen)
 
-	mnuFileSqliteOpen := vcl.NewMenuItem(mnuFile)
+	mnuFileBadger := vcl.NewMenuItem(mnuFile)
-	mnuFileSqliteOpen.SetCaption("Open SQLite database...")
+	mnuFileBadger.SetCaption("Badger")
-	mnuFileSqliteOpen.SetImageIndex(imgDatabaseAdd)
+	mnuFileBadger.SetImageIndex(imgVendorDgraph)
-	mnuFileSqliteOpen.SetOnClick(f.OnMnuFileSqliteOpenClick)
+	mnuFile.Add(mnuFileBadger)
-	mnuFile.Add(mnuFileSqliteOpen)
 
-	mnuFileBadgerOpen := vcl.NewMenuItem(mnuFile)
+	vcl_menuitem(mnuFileBadger, "Open database...", imgDatabaseAdd, f.OnMnuFileBadgerOpenClick)
-	mnuFileBadgerOpen.SetCaption("Open Badger v4 database...")
+	vcl_menuitem(mnuFileBadger, "New in-memory database", imgDatabaseAdd, f.OnMnuFileBadgerMemoryClick)
-	mnuFileBadgerOpen.SetImageIndex(imgDatabaseAdd)
-	mnuFileBadgerOpen.SetOnClick(f.OnMnuFileBadgerOpenClick)
-	mnuFile.Add(mnuFileBadgerOpen)
 
-	mnuFileSqliteMemory := vcl.NewMenuItem(mnuFile)
+	//
-	mnuFileSqliteMemory.SetCaption("New SQLite in-memory database")
-	mnuFileSqliteMemory.SetImageIndex(imgDatabaseAdd)
-	mnuFileSqliteMemory.SetOnClick(f.OnMnuFileSqliteMemoryClick)
-	mnuFile.Add(mnuFileSqliteMemory)
 
-	mnuSep := vcl.NewMenuItem(mnuFile)
+	mnuFileBolt := vcl.NewMenuItem(mnuFile)
-	mnuSep.SetCaption("-") // Creates separator
+	mnuFileBolt.SetCaption("Bolt")
-	mnuFile.Add(mnuSep)
+	mnuFileBolt.SetImageIndex(imgVendorGithub)
+	mnuFile.Add(mnuFileBolt)
+
+	vcl_menuitem(mnuFileBolt, "New database...", imgDatabaseAdd, f.OnMnuFileBoltNewClick)
+	vcl_menuitem(mnuFileBolt, "Open database...", imgDatabaseAdd, f.OnMnuFileBoltOpenClick)
+	vcl_menuitem(mnuFileBolt, "Open database (read-only)...", imgDatabaseAdd, f.OnMnuFileBoltOpenReadonlyClick)
+
+	//
+
+	mnuFileDebconf := vcl.NewMenuItem(mnuFile)
+	mnuFileDebconf.SetCaption("Debconf")
+	mnuFileDebconf.SetImageIndex(imgVendorDebian)
+	mnuFile.Add(mnuFileDebconf)
+
+	vcl_menuitem(mnuFileDebconf, "Open database...", imgDatabaseAdd, f.OnMnuFileDebianOpenClick)
+
+	//
+
+	mnuFilePebble := vcl.NewMenuItem(mnuFile)
+	mnuFilePebble.SetCaption("Pebble")
+	mnuFilePebble.SetImageIndex(imgVendorCockroach)
+	mnuFile.Add(mnuFilePebble)
+
+	vcl_menuitem(mnuFilePebble, "Open database...", imgDatabaseAdd, f.OnMnuFilePebbleOpenClick)
+	vcl_menuitem(mnuFilePebble, "New in-memory database", imgDatabaseAdd, f.OnMnuFilePebbleMemoryClick)
+
+	//
+
+	mnuFileRedis := vcl.NewMenuItem(mnuFile)
+	mnuFileRedis.SetCaption("Redis")
+	mnuFileRedis.SetImageIndex(imgVendorRedis)
+	mnuFile.Add(mnuFileRedis)
+
+	vcl_menuitem(mnuFileRedis, "Connect...", imgDatabaseAdd, f.OnMnuFileRedisConnectClick)
+
+	//
+
+	mnuFileSqlite := vcl.NewMenuItem(mnuFile)
+	mnuFileSqlite.SetCaption("SQLite")
+	mnuFileSqlite.SetImageIndex(imgVendorSqlite)
+	mnuFile.Add(mnuFileSqlite)
+
+	vcl_menuitem(mnuFileSqlite, "Open database...", imgDatabaseAdd, f.OnMnuFileSqliteOpenClick)
+	vcl_menuitem(mnuFileSqlite, "New in-memory database", imgDatabaseAdd, f.OnMnuFileSqliteMemoryClick)
+
+	vcl_menuseparator(mnuFileSqlite)
+	f.SQLiteUseCliDriver = vcl_menuitem(mnuFileSqlite, "Connect using CLI driver (experimental)", -1, nil)
+	f.SQLiteUseCliDriver.SetAutoCheck(true)
+
+	//
+
+	vcl_menuseparator(mnuFile)
 
 	mnuFileExit := vcl.NewMenuItem(mnuFile)
 	mnuFileExit.SetCaption("Exit")
@@ -90,13 +151,28 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	mnuQueryExecute.SetCaption("Execute")
 	mnuQueryExecute.SetShortCutFromString("F5")
 	mnuQueryExecute.SetOnClick(f.OnQueryExecute)
-	mnuQueryExecute.SetImageIndex(imgLightning)
+	mnuQueryExecute.SetImageIndex(imgResultsetNext)
 	mnuQuery.Add(mnuQueryExecute)
 
+	mnuHelp := vcl.NewMenuItem(f)
+	mnuHelp.SetCaption("Help")
+
+	mnuHelpVersion := vcl.NewMenuItem(mnuHelp)
+	mnuHelpVersion.SetCaption("Driver versions...")
+	mnuHelpVersion.SetOnClick(f.OnMenuHelpVersion)
+	mnuHelp.Add(mnuHelpVersion)
+
+	mnuHelpHomepage := vcl.NewMenuItem(mnuHelp)
+	mnuHelpHomepage.SetCaption("About " + APPNAME)
+	mnuHelpHomepage.SetShortCutFromString("F1")
+	mnuHelpHomepage.SetOnClick(f.OnMnuHelpHomepage)
+	mnuHelp.Add(mnuHelpHomepage)
+
 	f.Menu = vcl.NewMainMenu(f)
 	f.Menu.SetImages(f.ImageList)
 	f.Menu.Items().Add(mnuFile)
 	f.Menu.Items().Add(mnuQuery)
+	f.Menu.Items().Add(mnuHelp)
 
 	//
 
@@ -114,6 +190,7 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	f.Buckets.SetReadOnly(true) // prevent click to rename on nodes
 	f.Buckets.SetOnExpanding(f.OnNavExpanding)
 	f.Buckets.SetOnChange(f.OnNavChange)
+	f.Buckets.SetOnContextPopup(f.OnNavContextPopup)
 
 	hsplit := vcl.NewSplitter(f)
 	hsplit.SetParent(f)
@@ -135,23 +212,67 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	f.propertiesBox.BorderSpacing().SetAround(MY_SPACING)
 	f.propertiesBox.SetAlign(types.AlClient) // fill remaining space
 	f.propertiesBox.SetReadOnly(true)
-	f.propertiesBox.SetEnabled(false)
+	f.propertiesBox.SetEnabled(true) // Need to leave it enabled so scrolling works
+	f.propertiesBox.SetColor(vcl_default_tab_background())
+
 	f.propertiesBox.SetBorderStyle(types.BsNone)
-	f.propertiesBox.SetText("Open a database to get started...")
+	f.propertiesBox.SetScrollBars(types.SsAutoVertical)
 
 	dataTab := vcl.NewTabSheet(f.Tabs)
 	dataTab.SetParent(f.Tabs)
 	dataTab.SetCaption("Data")
 	dataTab.SetImageIndex(imgTable)
 
-	f.contentBox = vcl.NewListView(dataTab)
+	dataButtonBar := vcl.NewToolBar(dataTab)
+	dataButtonBar.SetParent(dataTab)
+	dataButtonBar.SetAlign(types.AlTop)
+	dataButtonBar.BorderSpacing().SetLeft(MY_SPACING)
+	dataButtonBar.BorderSpacing().SetTop(MY_SPACING)
+	dataButtonBar.BorderSpacing().SetBottom(1)
+	dataButtonBar.BorderSpacing().SetRight(MY_SPACING)
+	dataButtonBar.SetEdgeBorders(0)
+	dataButtonBar.SetImages(f.ImageList)
+
+	dataRefreshBtn := vcl.NewToolButton(dataButtonBar)
+	dataRefreshBtn.SetParent(dataButtonBar)
+	dataRefreshBtn.SetHint("Refresh")
+	dataRefreshBtn.SetShowHint(true)
+	dataRefreshBtn.SetImageIndex(imgArrowRefresh)
+	dataRefreshBtn.SetOnClick(func(sender vcl.IObject) { f.RefreshCurrentItem() })
+
+	f.dataInsertBtn = vcl.NewToolButton(dataButtonBar)
+	f.dataInsertBtn.SetParent(dataButtonBar)
+	f.dataInsertBtn.SetImageIndex(imgAdd)
+	f.dataInsertBtn.SetHint("Insert")
+	f.dataInsertBtn.SetShowHint(true)
+	f.dataInsertBtn.SetOnClick(f.OnDataInsertClick)
+
+	f.dataDelRowBtn = vcl.NewToolButton(dataButtonBar)
+	f.dataDelRowBtn.SetParent(dataButtonBar)
+	f.dataDelRowBtn.SetImageIndex(imgDelete)
+	f.dataDelRowBtn.SetHint("Delete Row")
+	f.dataDelRowBtn.SetShowHint(true)
+	f.dataDelRowBtn.SetOnClick(f.OnDataDeleteRowClick)
+
+	f.dataCommitBtn = vcl.NewToolButton(dataButtonBar)
+	f.dataCommitBtn.SetParent(dataButtonBar)
+	f.dataCommitBtn.SetImageIndex(imgPencilGo)
+	f.dataCommitBtn.SetHint("Commit")
+	f.dataCommitBtn.SetShowHint(true)
+	f.dataCommitBtn.SetOnClick(f.OnDataCommitClick)
+
+	f.contentBox = vcl.NewStringGrid(dataTab)
 	f.contentBox.SetParent(dataTab)
-	f.contentBox.BorderSpacing().SetAround(MY_SPACING)
+	f.contentBox.BorderSpacing().SetLeft(MY_SPACING)
+	f.contentBox.BorderSpacing().SetRight(MY_SPACING)
+	f.contentBox.BorderSpacing().SetBottom(MY_SPACING)
 	f.contentBox.SetAlign(types.AlClient) // fill remaining space
-	f.contentBox.SetViewStyle(types.VsReport) // "Report style" i.e. has columns
+	f.contentBox.SetOptions(f.contentBox.Options().Include(types.GoThumbTracking, types.GoColSizing, types.GoDblClickAutoSize, types.GoEditing))
-	f.contentBox.SetAutoWidthLastColumn(true)
+	f.contentBox.SetOnPrepareCanvas(f.OnDataPrepareCanvas)
-	f.contentBox.SetReadOnly(true)
+	f.contentBox.SetOnEditingDone(f.OnDataCellEdited)
-	f.contentBox.Columns().Clear()
+	f.contentBox.SetOnGetEditText(f.OnDataCellEditStarting)
+	f.contentBox.SetDefaultColWidth(MY_WIDTH)
+	vcl_stringgrid_clear(f.contentBox)
 
 	queryTab := vcl.NewTabSheet(f.Tabs)
 	queryTab.SetParent(f.Tabs)
@@ -163,61 +284,94 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	queryButtonBar.SetAlign(types.AlTop)
 	queryButtonBar.BorderSpacing().SetLeft(MY_SPACING)
 	queryButtonBar.BorderSpacing().SetTop(MY_SPACING)
-	queryButtonBar.BorderSpacing().SetBottom(0)
+	//queryButtonBar.BorderSpacing().SetBottom(1)
 	queryButtonBar.BorderSpacing().SetRight(MY_SPACING)
+	queryButtonBar.SetEdgeBorders(0)
 	queryButtonBar.SetImages(f.ImageList)
 	queryButtonBar.SetShowCaptions(true)
 
-	queryExecBtn := vcl.NewToolButton(queryButtonBar)
+	f.queryExecBtn = vcl.NewToolButton(queryButtonBar)
-	queryExecBtn.SetParent(queryButtonBar)
+	f.queryExecBtn.SetParent(queryButtonBar)
-	queryExecBtn.SetCaption("Execute")
+	f.queryExecBtn.SetHint("Execute")
-	// queryExecBtn.SetImageIndex(imgLightning)
+	f.queryExecBtn.SetShowHint(true)
-	queryExecBtn.SetOnClick(f.OnQueryExecute)
+	f.queryExecBtn.SetImageIndex(imgResultsetNext)
+	f.queryExecBtn.SetOnClick(f.OnQueryExecute)
 
-	f.queryInput = vcl.NewMemo(queryTab)
+	f.queryInput = vcl.NewRichEdit(queryTab)
 	f.queryInput.SetParent(queryTab)
 	f.queryInput.SetHeight(MY_HEIGHT)
 	f.queryInput.SetAlign(types.AlTop)
 	f.queryInput.SetTop(1)
+	if runtime.GOOS == "windows" {
+		f.queryInput.Font().SetName("Consolas")
+	} else {
 		f.queryInput.Font().SetName("monospace")
+	}
+	f.queryInput.SetCursor(types.CrIBeam) // Use text cursor instead of default pointer cursor
 	f.queryInput.BorderSpacing().SetLeft(MY_SPACING)
-	f.queryInput.BorderSpacing().SetTop(0)
+	//f.queryInput.BorderSpacing().SetTop(1)
 	f.queryInput.BorderSpacing().SetRight(MY_SPACING)
+	f.queryInput.SetBorderStyle(types.BsFrame)
+	// f.queryInput.SetOnKeyUp(f.OnQueryTextChanged) // Performs extremely slowly
 
 	vsplit := vcl.NewSplitter(queryTab)
 	vsplit.SetParent(queryTab)
 	vsplit.SetAlign(types.AlTop)
 	vsplit.SetTop(2)
 
-	f.queryResult = vcl.NewListView(queryTab)
+	f.queryResult = vcl.NewStringGrid(queryTab)
 	f.queryResult.SetParent(queryTab)
 	f.queryResult.SetAlign(types.AlClient) // fill remaining space
-	f.queryResult.SetViewStyle(types.VsReport) // "Report style" i.e. has columns
-	f.queryResult.SetAutoWidthLastColumn(true)
-	f.queryResult.SetReadOnly(true)
-	f.queryResult.Columns().Clear()
 	f.queryResult.BorderSpacing().SetLeft(MY_SPACING)
 	f.queryResult.BorderSpacing().SetRight(MY_SPACING)
 	f.queryResult.BorderSpacing().SetBottom(MY_SPACING)
+	f.queryResult.SetOptions(f.queryResult.Options().Include(types.GoThumbTracking))
+	f.queryResult.SetDefaultColWidth(MY_WIDTH)
+	vcl_stringgrid_clear(f.queryResult)
+
+	f.none = &noLoadedDatabase{}
+	f.OnNavChange(f, nil) // calls f.none.RenderForNav and sets up status bar content
 }
 
-func (f *TMainForm) OnMnuFileOpenClick(sender vcl.IObject) {
+func (f *TMainForm) OnMnuFileBoltNewClick(sender vcl.IObject) {
-	dlg := vcl.NewOpenDialog(f)
+	dlg := vcl.NewSaveDialog(f)
-	dlg.SetTitle("Select a database file...")
+	dlg.SetTitle("Save database as...")
-	dlg.SetFilter("Bolt database|*.db|All files|*.*")
+	dlg.SetFilter(boltFilter)
 	ret := dlg.Execute() // Fake blocking
 	if ret {
-		f.boltAddDatabaseFromFile(dlg.FileName())
+		f.boltAddDatabaseFromFile(dlg.FileName(), false)
+	}
+}
+
+func (f *TMainForm) OnMnuFileBoltOpenClick(sender vcl.IObject) {
+	dlg := vcl.NewOpenDialog(f)
+	dlg.SetTitle("Select a database file...")
+	dlg.SetFilter(boltFilter)
+	ret := dlg.Execute() // Fake blocking
+	if ret {
+		f.boltAddDatabaseFromFile(dlg.FileName(), false)
+	}
+}
+
+func (f *TMainForm) OnMnuFileBoltOpenReadonlyClick(sender vcl.IObject) {
+	dlg := vcl.NewOpenDialog(f)
+	dlg.SetTitle("Select a database file...")
+	dlg.SetFilter(boltFilter)
+	ret := dlg.Execute() // Fake blocking
+	if ret {
+		f.boltAddDatabaseFromFile(dlg.FileName(), true)
 	}
 }
 
 func (f *TMainForm) OnMnuFileSqliteOpenClick(sender vcl.IObject) {
+	cliDriver := f.SQLiteUseCliDriver.Checked()
+
 	dlg := vcl.NewOpenDialog(f)
 	dlg.SetTitle("Select a database file...")
-	dlg.SetFilter("SQLite database|*.db;*.db3;*.sqlite;*.sqlite3|All files|*.*")
+	dlg.SetFilter(sqliteFilter)
 	ret := dlg.Execute() // Fake blocking
 	if ret {
-		f.sqliteAddDatabaseFromFile(dlg.FileName())
+		f.sqliteAddDatabaseFromFile(dlg.FileName(), cliDriver)
 	}
 }
 
@@ -230,14 +384,370 @@ func (f *TMainForm) OnMnuFileBadgerOpenClick(sender vcl.IObject) {
 	}
 }
 
+func (f *TMainForm) OnMnuFileBadgerMemoryClick(sender vcl.IObject) {
+	f.badgerAddDatabaseFromMemory()
+}
+
+func (f *TMainForm) OnMnuFilePebbleOpenClick(sender vcl.IObject) {
+	dlg := vcl.NewSelectDirectoryDialog(f)
+	dlg.SetTitle("Select a database directory...")
+	ret := dlg.Execute() // Fake blocking
+	if ret {
+		f.pebbleAddDatabaseFrom(dlg.FileName(), nil)
+	}
+}
+
+func (f *TMainForm) OnMnuFileDebianOpenClick(sender vcl.IObject) {
+	dlg := vcl.NewOpenDialog(f)
+	dlg.SetTitle("Select a database file...")
+	dlg.SetFilter("Debconf database|*.dat|All files|*.*")
+	if runtime.GOOS == "linux" {
+		dlg.SetInitialDir(`/var/cache/debconf/`)
+	}
+	ret := dlg.Execute() // Fake blocking
+	if ret {
+		f.debconfAddDatabaseFrom(dlg.FileName())
+	}
+}
+
+func (f *TMainForm) OnMnuFilePebbleMemoryClick(sender vcl.IObject) {
+	f.pebbleAddDatabaseFromMemory()
+}
+
 func (f *TMainForm) OnMnuFileSqliteMemoryClick(sender vcl.IObject) {
-	f.sqliteAddDatabaseFromFile(`:memory:`)
+	cliDriver := f.SQLiteUseCliDriver.Checked()
+
+	f.sqliteAddDatabaseFromFile(`:memory:`, cliDriver)
+}
+
+func (f *TMainForm) OnMnuFileRedisConnectClick(sender vcl.IObject) {
+
+	var child *TRedisConnectionDialog
+	vcl.Application.CreateForm(&child)
+	defer child.Free()
+
+	var ret TRedisConnectionDialogResult
+	child.CustomReturn = &ret
+
+	mr := child.ShowModal() // Fake blocking
+	if mr != types.MrOk || ret == nil {
+		return // Cancelled
+	}
+
+	// Connect
+	f.redisConnect(ret)
 }
 
 func (f *TMainForm) OnMnuFileExitClick(sender vcl.IObject) {
 	f.Close()
 }
 
+func (f *TMainForm) OnMnuHelpHomepage(sender vcl.IObject) {
+	err := browser.OpenURL(HOMEPAGE_URL)
+	if err != nil {
+		vcl.ShowMessage("Opening browser: " + err.Error())
+	}
+}
+
+func (f *TMainForm) OnMenuHelpVersion(sender vcl.IObject) {
+
+	bi, ok := debug.ReadBuildInfo()
+	if !ok {
+		return
+	}
+
+	info := "This version of " + APPNAME + " was compiled with:\n\n"
+	for _, dep := range bi.Deps {
+
+		// Filter to only interesting things
+		switch dep.Path {
+		case `github.com/cockroachdb/pebble`,
+			`github.com/dgraph-io/badger/v4`,
+			`github.com/mattn/go-sqlite3`,
+			`github.com/redis/go-redis/v9`,
+			`go.etcd.io/bbolt`,
+			`modernc.org/sqlite`:
+			info += fmt.Sprintf("- %s %s\n", dep.Path, dep.Version)
+		}
+	}
+
+	vcl.ShowMessage(info)
+}
+
+func (f *TMainForm) OnNavContextPopup(sender vcl.IObject, mousePos types.TPoint, handled *bool) {
+	*handled = true
+
+	curItem := f.Buckets.Selected()
+	if curItem == nil {
+		// Nothing is selected at all
+		return
+	}
+
+	ndata := (*navData)(curItem.Data())
+
+	mnu := vcl.NewPopupMenu(f.Buckets)
+	mnu.SetImages(f.ImageList)
+
+	mnuRefresh := vcl.NewMenuItem(mnu)
+	mnuRefresh.SetCaption("Refresh")
+	mnuRefresh.SetImageIndex(imgArrowRefresh)
+	mnuRefresh.SetOnClick(func(sender vcl.IObject) { f.OnNavContextRefresh(curItem, ndata) })
+	mnu.Items().Add(mnuRefresh)
+
+	// Check what custom actions the ndata->db itself wants to add
+	actions, err := ndata.ld.NavContext(ndata)
+	if err != nil {
+		vcl.ShowMessage(err.Error())
+		return
+	}
+
+	if len(actions) > 0 {
+		mnuSep := vcl.NewMenuItem(mnu)
+		mnuSep.SetCaption("-")
+		mnu.Items().Add(mnuSep)
+
+		for _, action := range actions {
+			mnuAction := vcl.NewMenuItem(mnu)
+			mnuAction.SetCaption(action.Name)
+			cb := action.Callback // Copy to avoid reuse of loop variable
+			mnuAction.SetOnClick(func(sender vcl.IObject) {
+				err = cb(f, ndata)
+				if err != nil {
+					vcl.ShowMessage(err.Error())
+				}
+				f.OnNavContextRefresh(curItem, ndata)
+			})
+			mnu.Items().Add(mnuAction)
+		}
+	}
+
+	if curItem.Parent() == nil {
+		// Top-level item (database connection). Allow closing by right-click.
+		mnuSep := vcl.NewMenuItem(mnu)
+		mnuSep.SetCaption("-")
+		mnu.Items().Add(mnuSep)
+
+		mnuClose := vcl.NewMenuItem(mnu)
+		mnuClose.SetCaption("Close")
+		mnuClose.SetOnClick(f.OnNavContextClose)
+		mnuClose.SetImageIndex(imgDatabaseDelete)
+		mnu.Items().Add(mnuClose)
+	}
+
+	// Show popup
+	mnu.Popup2()
+}
+
+func (f *TMainForm) RefreshCurrentItem() {
+	item := f.Buckets.Selected()
+	if item == nil {
+		return // nothing to do
+	}
+
+	ndata := (*navData)(item.Data())
+
+	f.OnNavContextRefresh(item, ndata) // Refresh LHS pane/children
+	f.OnNavChange(f.Buckets, item)     // Refresh RHS pane/data content
+}
+
+func (f *TMainForm) OnNavContextRefresh(item *vcl.TTreeNode, ndata *navData) {
+	isExpanded := item.Expanded()
+
+	// Reset nav node to 'unloaded' state
+	item.Collapse(true)
+	item.DeleteChildren()
+	item.SetHasChildren(true)
+	ndata.childrenLoaded = false
+
+	// Trigger a virtual reload
+	item.Expand(false) // Calls OnNavExpanding to dynamically detect children
+
+	// Restore previous gui state
+	item.SetExpanded(isExpanded)
+}
+
+func (f *TMainForm) OnDataPrepareCanvas(sender vcl.IObject, aCol, aRow int32, aState types.TGridDrawState) {
+
+	if _, ok := f.deleteRows[aRow]; ok {
+		f.contentBox.Canvas().Brush().SetColor(CO_DELETE)
+		return
+	}
+
+	if _, ok := f.insertRows[aRow]; ok {
+		f.contentBox.Canvas().Brush().SetColor(CO_INSERT)
+		return
+	}
+
+	if er, ok := f.updateRows[aRow]; ok {
+		// This row is being edited
+		if int32slice_contains(er, aCol) {
+			f.contentBox.Canvas().Brush().SetColor(CO_EDIT_EXPLICIT)
+		} else {
+			f.contentBox.Canvas().Brush().SetColor(CO_EDIT_IMPLICIT)
+		}
+		return
+	}
+}
+
+// func (f *TMainForm) OnDataCellEditStarting(sender vcl.IObject, aCol, aRow int32, editor **vcl.TWinControl) {
+func (f *TMainForm) OnDataCellEditStarting(sender vcl.IObject, aCol, aRow int32, value *string) {
+	f.isEditing = true
+}
+
+func (f *TMainForm) OnDataCellEdited(sender vcl.IObject) {
+	// The OnEditingDone event fires whenever the TStringGrid loses focus, even
+	// if editing was not currently taking place
+	// To detect real edits, set a flag in the OnSelectEditor event
+	if !f.isEditing {
+		return
+	}
+	f.isEditing = false
+
+	aRow := f.contentBox.Row()
+	aCol := f.contentBox.Col()
+
+	// If this is an insert row, no need to patch updateRows
+	if _, ok := f.insertRows[aRow]; ok {
+		return // nothing to do
+	}
+
+	if chk, ok := f.updateRows[aRow]; ok {
+		if int32slice_contains(chk, aCol) {
+			// nothing to do
+		} else {
+			chk = append(chk, aCol)
+			f.updateRows[aRow] = chk
+		}
+	} else {
+		f.updateRows[aRow] = []int32{aCol}
+	}
+
+	// If this row was marked for deletion, this new event takes priority
+	delete(f.deleteRows, aRow)
+
+	// Signal repaint
+	f.contentBox.InvalidateRow(aRow)
+}
+
+func (f *TMainForm) OnDataInsertClick(sender vcl.IObject) {
+	if !f.contentBox.Enabled() {
+		return // Not an active data view
+	}
+
+	rpos := f.contentBox.RowCount()
+	f.contentBox.SetRowCount(rpos + 1)
+
+	f.insertRows[rpos] = struct{}{}
+
+	// Scroll to bottom
+	f.contentBox.SetTopRow(rpos)
+}
+
+func (f *TMainForm) OnDataDeleteRowClick(sender vcl.IObject) {
+	if !f.contentBox.Enabled() {
+		return // Not an active data view
+	}
+
+	rpos := f.contentBox.Row()
+	f.deleteRows[rpos] = struct{}{}
+
+	// If this row was marked for edit, this takes priority
+	delete(f.updateRows, rpos)
+
+	// Repaint
+	f.contentBox.InvalidateRow(rpos)
+}
+
+func (f *TMainForm) OnDataCommitClick(sender vcl.IObject) {
+	if !f.contentBox.Enabled() {
+		return // Not an active data view
+	}
+
+	node := f.Buckets.Selected()
+	if node == nil {
+		vcl.ShowMessage("No database selected")
+		return
+	}
+
+	scrollPos := f.contentBox.TopRow()
+
+	ndata := (*navData)(node.Data())
+
+	editableLd, ok := ndata.ld.(editableLoadedDatabase)
+	if !ok {
+		vcl.ShowMessage("Unsupported action for this database")
+		return
+	}
+
+	err := editableLd.ApplyChanges(f, ndata)
+	if err != nil {
+		vcl.ShowMessage(err.Error())
+	}
+
+	// Refresh content
+	f.OnNavChange(f.Buckets, node) // Refresh RHS pane/data content
+
+	// Preserve scroll position
+	f.contentBox.SetTopRow(scrollPos)
+}
+
+func (f *TMainForm) OnNavContextClose(sender vcl.IObject) {
+	curItem := f.Buckets.Selected()
+	if curItem == nil {
+		return // Nothing selected (shouldn't happen)
+	}
+	if curItem.Parent() != nil {
+		return // Selection is not top-level DB connection (shouldn't happen)
+	}
+
+	ndata := (*navData)(curItem.Data())
+
+	ndata.ld.Close()
+	curItem.Delete()
+
+	// n.b. This triggers OnNavChange, which will then re-render from noLoadedDatabase{}
+}
+
+// func (f *TMainForm) OnQueryTextChanged(sender vcl.IObject) {
+func (f *TMainForm) OnQueryTextChanged(sender vcl.IObject, key *types.Char, shift types.TShiftState) {
+
+	// FIXME changing the text colour calls the onchange handler recursively
+	// FIXME changing the text colour pushes into the undo stack
+
+	// Preserve
+	f.queryInput.Lines().BeginUpdate()
+	origPos := f.queryInput.SelStart()
+	origLen := f.queryInput.SelLength()
+	defer func() {
+		f.queryInput.SetSelStart(origPos)
+		f.queryInput.SetSelLength(origLen)
+		f.queryInput.Lines().EndUpdate()
+	}()
+
+	tx := strings.ToLower(f.queryInput.Text())
+
+	// Reset all existing colors
+	f.queryInput.SetSelStart(0)
+	f.queryInput.SetSelLength(int32(len(tx)))
+	f.queryInput.SelAttributes().SetColor(colors.ClBlack)
+
+	searchPos := 0
+	for {
+		matchPos := strings.Index(tx[searchPos:], "select")
+		if matchPos == -1 {
+			break
+		}
+
+		matchPos += searchPos // compensate for slicing
+
+		f.queryInput.SetSelStart(int32(matchPos))
+		f.queryInput.SetSelLength(6)
+		f.queryInput.SelAttributes().SetColor(colors.ClRed)
+
+		searchPos = matchPos + 6 // strlen(SELECT)
+	}
+}
+
 func (f *TMainForm) OnQueryExecute(sender vcl.IObject) {
 	// If query tab is not selected, switch to it, but do not exec
 	if f.Tabs.ActivePageIndex() != 2 {
@@ -245,6 +755,15 @@ func (f *TMainForm) OnQueryExecute(sender vcl.IObject) {
 		return
 	}
 
+	queryString := f.queryInput.Text()
+	if f.queryInput.SelLength() > 0 {
+		queryString = f.queryInput.SelText() // Just the selected text
+	}
+
+	if strings.TrimSpace(queryString) == "" {
+		return // prevent blank query
+	}
+
 	// Execute
 	node := f.Buckets.Selected()
 	if node == nil {
@@ -253,22 +772,60 @@ func (f *TMainForm) OnQueryExecute(sender vcl.IObject) {
 	}
 
 	ndata := (*navData)(node.Data())
-	ndata.ld.ExecQuery(f.queryInput.Text(), f.queryResult)
+
+	queryableLd, ok := ndata.ld.(queryableLoadedDatabase)
+	if !ok {
+		vcl.ShowMessage("Unsupported action for this database")
+		return
+	}
+
+	err := queryableLd.ExecQuery(queryString, f.queryResult)
+	if err != nil {
+		vcl.ShowMessage(err.Error())
+		return
+	}
 }
 
 func (f *TMainForm) OnNavChange(sender vcl.IObject, node *vcl.TTreeNode) {
 
-	if node.Data() == nil {
+	var ld loadedDatabase = f.none
-		vcl.ShowMessage("unexpected nil data")
+	var ndata *navData = nil
-		return
+
+	if node != nil && node.Data() != nil {
+		ndata = (*navData)(node.Data())
+		ld = ndata.ld
 	}
 
-	ndata := (*navData)(node.Data())
+	// Reset some controls that the render function is expected to populate
+	f.insertRows = make(map[int32]struct{})
+	f.updateRows = make(map[int32][]int32)
+	f.deleteRows = make(map[int32]struct{})
+	f.isEditing = false
+	f.propertiesBox.Clear()
+	vcl_stringgrid_clear(f.contentBox)
 
-	ndata.ld.RenderForNav(f, ndata) // Handover to the database type's own renderer function
+	err := ld.RenderForNav(f, ndata) // Handover to the database type's own renderer function
+	if err != nil {
+		vcl.ShowMessage(err.Error())
+
+		// Ensure elements are disabled
+		f.contentBox.SetEnabled(false)
+	}
+
+	// Toggle the Edit functionality
+	_, ok := ld.(editableLoadedDatabase)
+	f.dataCommitBtn.SetEnabled(ok)
+	f.dataDelRowBtn.SetEnabled(ok)
+	f.dataInsertBtn.SetEnabled(ok)
+
+	// Toggle the Query functionality
+	_, ok = ld.(queryableLoadedDatabase)
+	f.queryInput.SetEnabled(ok)
+	f.queryResult.SetEnabled(ok)
+	f.queryExecBtn.SetEnabled(ok)
 
 	// We're in charge of common status bar text updates
-	f.StatusBar.SetSimpleText(ndata.ld.DisplayName() + " | " + ndata.ld.DriverName())
+	f.StatusBar.SetSimpleText(ld.DisplayName() + " | " + ld.DriverName())
 }
 
 func (f *TMainForm) OnNavExpanding(sender vcl.IObject, node *vcl.TTreeNode, allowExpansion *bool) {
@@ -281,25 +838,67 @@ func (f *TMainForm) OnNavExpanding(sender vcl.IObject, node *vcl.TTreeNode, allo
 
 	ndata := (*navData)(node.Data())
 
-	if ndata.childrenLoaded {
+	err := f.NavLoadChildren(node, ndata)
+	if err != nil {
+
+		if errors.Is(err, ErrNavNotExist) {
+			// The nav entry has been deleted.
+			// This is a normal thing to happen when e.g. deleting a table
+			// f.StatusBar.SetSimpleText(err.Error()) // Just gets overridden when the selection changes
+			node.Delete()
 			return
 		}
 
+		vcl.ShowMessage(err.Error())
+		*allowExpansion = false // Permanently block
+		return
+	}
+
+	*allowExpansion = node.HasChildren()
+
+	// While we're here - preload one single level deep (not any deeper)
+
+	if node.HasChildren() {
+
+		// This node has children that we haven't processed. Process them now
+		cc := node.GetFirstChild()
+
+		for {
+			ndataChild := (*navData)(cc.Data())
+			if ndataChild.childrenLoaded {
+				break // We always do them together, so if one's done, no need to keep looking
+			}
+
+			f.NavLoadChildren(cc, ndataChild)
+
+			cc = cc.GetNextSibling()
+			if cc == nil {
+				break
+			}
+		}
+
+	}
+}
+
+func (f *TMainForm) NavLoadChildren(node *vcl.TTreeNode, ndata *navData) error {
+
+	if ndata.childrenLoaded {
+		return nil // Nothing to do
+	}
+
 	// Find the child buckets from this point under the element
 	nextBucketNames, err := ndata.ld.NavChildren(ndata)
 	if err != nil {
-		vcl.ShowMessage(fmt.Sprintf("Failed to find child buckets under %q: %s", strings.Join(ndata.bucketPath, `/`), err.Error()))
+		return fmt.Errorf("Failed to find child buckets under %q: %w", strings.Join(ndata.bucketPath, `/`), err)
-		*allowExpansion = false
-		return
 	}
 
 	ndata.childrenLoaded = true // don't repeat this work
 
 	if len(nextBucketNames) == 0 {
 		node.SetHasChildren(false)
-		*allowExpansion = false
 
 	} else {
+		node.SetHasChildren(true)
 
 		// Populate LCL child nodes
 		for _, bucketName := range nextBucketNames {
@@ -319,7 +918,7 @@ func (f *TMainForm) OnNavExpanding(sender vcl.IObject, node *vcl.TTreeNode, allo
 
 			ndata.ld.Keepalive(navData)
 		}
+	}
 
-		*allowExpansion = true
+	return nil
-	}
 }

platform_windows.go

@@ -0,0 +1,5 @@
+package main
+
+import (
+	_ "github.com/ying32/govcl/pkgs/winappres" // Extra _syso files for Windows
+)

redisConnectionDialog.go

@@ -0,0 +1,130 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/redis/go-redis/v9"
+	"github.com/ying32/govcl/vcl"
+	"github.com/ying32/govcl/vcl/types"
+)
+
+type TRedisConnectionDialogResult = *redis.Options
+
+type TRedisConnectionDialog struct {
+	*vcl.TForm
+
+	Address         *vcl.TEdit
+	Port            *vcl.TSpinEdit
+	Password        *vcl.TEdit
+	IsResp3Protocol *vcl.TCheckBox
+	ConnectBtn      *vcl.TButton
+
+	// CustomReturn must be set by the caller to a *redis.Options variable.
+	CustomReturn *TRedisConnectionDialogResult // nil = no CustomReturn/cancelled dialog
+}
+
+func (f *TRedisConnectionDialog) OnFormCreate(sender vcl.IObject) {
+
+	f.SetCaption("Connect to Redis...")
+	f.SetWidth(320)
+	f.SetHeight(160)
+	f.SetPosition(types.PoOwnerFormCenter)
+
+	// row 1
+
+	row1 := vcl_row(f, 1)
+
+	lblAddress := vcl.NewLabel(row1)
+	lblAddress.SetParent(row1)
+	lblAddress.SetCaption("Address:")
+	lblAddress.SetAlign(types.AlLeft)
+	lblAddress.SetLayout(types.TlCenter)
+	lblAddress.SetLeft(1)
+	lblAddress.BorderSpacing().SetAround(MY_SPACING)
+
+	f.Address = vcl.NewEdit(row1)
+	f.Address.SetParent(row1)
+	f.Address.SetAlign(types.AlClient) // grow AlLeft)
+	f.Address.SetWidth(MY_WIDTH)
+	f.Address.SetLeft(2)
+	f.Address.SetText("127.0.0.1")
+	f.Address.BorderSpacing().SetAround(MY_SPACING)
+
+	lblPort := vcl.NewLabel(row1)
+	lblPort.SetParent(row1)
+	lblPort.SetCaption(":")
+	lblPort.SetAlign(types.AlRight)
+	lblPort.SetLayout(types.TlCenter)
+	lblPort.SetLeft(0)
+	lblPort.SetAutoSize(true)
+	lblPort.BorderSpacing().SetAround(MY_SPACING)
+
+	f.Port = vcl.NewSpinEdit(row1)
+	f.Port.SetParent(row1)
+	f.Port.SetMinValue(1)
+	f.Port.SetMaxValue(65535)
+	f.Port.SetValue(6379) // Redis default port
+	f.Port.SetAlign(types.AlRight)
+	f.Port.SetLeft(1000)
+	f.Port.BorderSpacing().SetAround(MY_SPACING)
+
+	// row 2
+
+	row2 := vcl_row(f, 2)
+
+	lblPassword := vcl.NewLabel(row2)
+	lblPassword.SetParent(row2)
+	lblPassword.SetCaption("Password:")
+	lblPassword.SetAlign(types.AlLeft)
+	lblPassword.SetLayout(types.TlCenter)
+	lblPassword.SetLeft(1)
+	lblPassword.BorderSpacing().SetAround(MY_SPACING)
+
+	f.Password = vcl.NewEdit(row2)
+	f.Password.SetParent(row2)
+	f.Password.SetAlign(types.AlClient) // grow
+	f.Password.SetLeft(2)
+	f.Password.SetWidth(MY_WIDTH)
+	f.Password.SetPasswordChar(uint16('*'))
+	f.Password.BorderSpacing().SetAround(MY_SPACING)
+
+	// row 3
+
+	f.IsResp3Protocol = vcl.NewCheckBox(f)
+	f.IsResp3Protocol.SetParent(f)
+	f.IsResp3Protocol.SetCaption("Use RESP v3 protocol")
+	f.IsResp3Protocol.SetChecked(true)
+	f.IsResp3Protocol.SetAlign(types.AlTop)
+	f.IsResp3Protocol.SetTop(3)
+	f.IsResp3Protocol.BorderSpacing().SetAround(MY_SPACING)
+
+	// buttons
+
+	row4 := vcl_row(f, 4)
+	row4.SetAlign(types.AlBottom)
+
+	f.ConnectBtn = vcl.NewButton(row4)
+	f.ConnectBtn.SetParent(row4)
+	f.ConnectBtn.SetAlign(types.AlRight)
+	f.ConnectBtn.SetCaption("Connect")
+	f.ConnectBtn.SetOnClick(f.OnConnectBtnClick)
+}
+
+func (f *TRedisConnectionDialog) OnConnectBtnClick(sender vcl.IObject) {
+
+	ret := &redis.Options{
+		Addr:     fmt.Sprintf("%s:%d", f.Address.Text(), f.Port.Value()),
+		Password: f.Password.Text(),
+		DB:       0, // Start off with default DB, but, we will browse them ourselves
+		Protocol: 2, // RESP2
+	}
+
+	if f.IsResp3Protocol.Checked() {
+		ret.Protocol = 3 // RESP3
+	}
+
+	// Success.
+	// Fill in target pointer and close dialog with "MrOk" sentinel
+	*f.CustomReturn = ret
+	f.SetModalResult(types.MrOk)
+}

sqlite.go

@@ -1,266 +0,0 @@
-package main
-
-import (
-	"database/sql"
-	"fmt"
-	"path/filepath"
-	"unsafe"
-
-	"github.com/ying32/govcl/vcl"
-	"github.com/ying32/govcl/vcl/types"
-)
-
-const (
-	sqliteTablesCaption = "Tables"
-)
-
-type sqliteLoadedDatabase struct {
-	displayName string
-	path        string
-	db          *sql.DB
-	nav         *vcl.TTreeNode
-
-	arena []*navData // keepalive
-}
-
-func (ld *sqliteLoadedDatabase) DisplayName() string {
-	return ld.displayName
-}
-
-func (ld *sqliteLoadedDatabase) RootElement() *vcl.TTreeNode {
-	return ld.nav
-}
-
-func (ld *sqliteLoadedDatabase) Keepalive(ndata *navData) {
-	ld.arena = append(ld.arena, ndata)
-}
-
-func (ld *sqliteLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
-
-	if len(ndata.bucketPath) == 0 {
-		// Top-level
-		f.propertiesBox.SetText("Please select...")
-		f.contentBox.SetEnabled(false)
-		f.contentBox.Clear()
-
-	} else if len(ndata.bucketPath) == 1 {
-		// Category (tables, ...)
-		f.propertiesBox.SetText("Please select...")
-		f.contentBox.SetEnabled(false)
-		f.contentBox.Clear()
-
-	} else if len(ndata.bucketPath) == 2 && ndata.bucketPath[0] == sqliteTablesCaption {
-		// Render for specific table
-		tableName := ndata.bucketPath[1]
-
-		// Get some basic properties
-		r := ld.db.QueryRow(`SELECT sql FROM sqlite_schema WHERE name = ?;`, tableName)
-		var schemaStmt string
-		err := r.Scan(&schemaStmt)
-		if err != nil {
-			schemaStmt = fmt.Sprintf("* Failed to describe table %q: %s", tableName, err.Error())
-		}
-
-		// Display table properties
-		f.propertiesBox.SetText(fmt.Sprintf("Selected table %q\n\nSchema:\n\n%s", tableName, schemaStmt))
-
-		f.contentBox.SetEnabled(false)
-		f.contentBox.Clear()
-
-		// Load column details
-		// Use SELECT form instead of common PRAGMA table_info so we can just get names
-		// We could possibly get this from the main data select, but this will
-		// work even when there are 0 results
-		columnNames, err := ld.sqliteGetColumnNamesForTable(tableName)
-		if err != nil {
-			vcl.ShowMessageFmt("Failed to load columns for table %q: %s", tableName, err.Error())
-			return
-		}
-
-		populateColumns(columnNames, f.contentBox)
-
-		// Select count(*) so we know to display a warning if there are too many entries
-		// TODO
-
-		// Select * with small limit
-		datar, err := ld.db.Query(`SELECT * FROM ` + tableName + ` LIMIT 1000`) // WARNING can't prepare this parameter, but it comes from the DB (trusted)
-		if err != nil {
-			vcl.ShowMessageFmt("Failed to load data for table %q: %s", tableName, err.Error())
-			return
-		}
-		defer datar.Close()
-		populateRows(datar, f.contentBox)
-
-		// We successfully populated the data grid
-		f.contentBox.SetEnabled(true)
-
-	} else {
-		// ??? unknown
-
-	}
-
-}
-
-func (ld *sqliteLoadedDatabase) sqliteGetColumnNamesForTable(tableName string) ([]string, error) {
-	colr, err := ld.db.Query(`SELECT name FROM pragma_table_info(?)`, tableName)
-	if err != nil {
-		return nil, fmt.Errorf("Query: %w", err)
-	}
-	defer colr.Close()
-
-	var ret []string
-
-	for colr.Next() {
-
-		var columnName string
-		err = colr.Scan(&columnName)
-		if err != nil {
-			return nil, fmt.Errorf("Scan: %w", colr.Err())
-		}
-
-		ret = append(ret, columnName)
-	}
-	if colr.Err() != nil {
-		return nil, colr.Err()
-	}
-
-	return ret, nil
-}
-
-func populateColumns(names []string, dest *vcl.TListView) {
-	dest.Columns().Clear()
-	for _, columnName := range names {
-		col := dest.Columns().Add()
-		col.SetCaption(columnName)
-		col.SetWidth(MY_WIDTH)
-		col.SetAlignment(types.TaLeftJustify)
-	}
-}
-
-func populateRows(rr *sql.Rows, dest *vcl.TListView) {
-
-	numColumns := int(dest.Columns().Count())
-
-	for rr.Next() {
-		fields := make([]interface{}, numColumns)
-		pfields := make([]interface{}, numColumns)
-		for i := 0; i < numColumns; i += 1 {
-			pfields[i] = &fields[i]
-		}
-
-		err := rr.Scan(pfields...)
-		if err != nil {
-			vcl.ShowMessageFmt("Failed to load data: %s", err.Error())
-			return
-		}
-
-		dataEntry := dest.Items().Add()
-		dataEntry.SetCaption(formatAny(fields[0]))
-		for i := 1; i < len(fields); i += 1 {
-			dataEntry.SubItems().Add(formatAny(fields[i]))
-		}
-
-	}
-	if rr.Err() != nil {
-		vcl.ShowMessageFmt("Failed to load data: %s", rr.Err().Error())
-		return
-	}
-}
-
-func (ld *sqliteLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
-	rr, err := ld.db.Query(query)
-	if err != nil {
-		vcl.ShowMessage(err.Error())
-		return
-	}
-
-	defer rr.Close()
-
-	resultArea.SetEnabled(false)
-	resultArea.Clear()
-
-	columns, err := rr.Columns()
-	if err != nil {
-		vcl.ShowMessage(err.Error())
-		return
-	}
-
-	populateColumns(columns, resultArea)
-
-	populateRows(rr, resultArea)
-
-	resultArea.SetEnabled(true)
-}
-
-func (ld *sqliteLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
-
-	if len(ndata.bucketPath) == 0 {
-		// The top-level children are always:
-		return []string{sqliteTablesCaption}, nil
-	}
-
-	if len(ndata.bucketPath) == 1 && ndata.bucketPath[0] == sqliteTablesCaption {
-		rr, err := ld.db.Query(`SELECT name FROM sqlite_master WHERE type='table' ORDER BY name ASC;`)
-		if err != nil {
-			return nil, err
-		}
-		defer rr.Close()
-
-		var gather []string
-		for rr.Next() {
-			var tableName string
-			err = rr.Scan(&tableName)
-			if err != nil {
-				return nil, err
-			}
-
-			gather = append(gather, tableName)
-		}
-		if rr.Err() != nil {
-			return nil, rr.Err()
-		}
-
-		return gather, nil
-	}
-
-	if len(ndata.bucketPath) == 2 {
-		return nil, nil // Never any deeper children
-	}
-
-	return nil, fmt.Errorf("unknown nav path %#v", ndata.bucketPath)
-}
-
-var _ loadedDatabase = &sqliteLoadedDatabase{} // interface assertion
-
-//
-
-func (f *TMainForm) sqliteAddDatabaseFromFile(path string) {
-
-	// TODO load in background thread to stop blocking the UI
-	db, err := sql.Open("sqlite3", path)
-	if err != nil {
-		vcl.ShowMessage(fmt.Sprintf("Failed to load database '%s': %s", path, err.Error()))
-		return
-	}
-
-	ld := &sqliteLoadedDatabase{
-		path:        path,
-		displayName: filepath.Base(path),
-		db:          db,
-	}
-
-	ld.nav = f.Buckets.Items().Add(nil, ld.displayName)
-	ld.nav.SetImageIndex(imgDatabase)
-	ld.nav.SetSelectedIndex(imgDatabase)
-	ld.nav.SetHasChildren(true) // dynamically populate in OnNavExpanding
-	navData := &navData{
-		ld:             ld,
-		childrenLoaded: false,      // will be loaded dynamically
-		bucketPath:     []string{}, // empty = root
-	}
-	ld.nav.SetData(unsafe.Pointer(navData))
-
-	f.dbs = append(f.dbs, ld)
-
-	ld.Keepalive(navData)
-}

sqliteclidriver/eventcmd.go

@@ -0,0 +1,115 @@
+package sqliteclidriver
+
+import (
+	"io"
+	"os/exec"
+	"sync"
+)
+
+const (
+	evtypeStdout int = iota
+	evtypeStderr
+	evtypeExit
+)
+
+type processEvent struct {
+	evtype int
+	data   []byte
+	err    error
+}
+
+func (pe processEvent) Error() string {
+	if pe.err != nil {
+		return pe.err.Error()
+	}
+
+	if pe.evtype == evtypeStderr {
+		return string(pe.data)
+	}
+
+	return "<no error>"
+}
+
+func (pe processEvent) Unwrap() error {
+	return pe.err
+}
+
+//
+
+func ExecEvents(cmd *exec.Cmd) (<-chan processEvent, io.WriteCloser, error) {
+
+	pw, err := cmd.StdinPipe()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	pr, err := cmd.StdoutPipe()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	pe, err := cmd.StderrPipe()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	err = cmd.Start()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	chEvents := make(chan processEvent, 0)
+
+	var wg sync.WaitGroup
+
+	go func() {
+		defer wg.Done()
+		processEventWorker(pr, evtypeStdout, chEvents)
+	}()
+
+	go func() {
+		defer wg.Done()
+		processEventWorker(pe, evtypeStderr, chEvents)
+	}()
+	wg.Add(2)
+
+	go func() {
+		// Only call cmd.Wait() after pipes are closed
+		wg.Wait()
+
+		err = cmd.Wait()
+		chEvents <- processEvent{
+			evtype: evtypeExit,
+			err:    err,
+		}
+
+		close(chEvents)
+	}()
+
+	return chEvents, pw, nil
+}
+
+func processEventWorker(p io.Reader, evtype int, dest chan<- processEvent) {
+	for {
+		buf := make([]byte, 1024)
+		n, err := p.Read(buf)
+
+		if n > 0 {
+			dest <- processEvent{
+				evtype: evtype,
+				data:   buf[0:n],
+			}
+		}
+
+		if err != nil {
+			dest <- processEvent{
+				evtype: evtype,
+				err:    err,
+			}
+
+			// Assume all errors are permanent
+			// Ordering can produce either io.EOF, ErrClosedPipe, or PathError{"file already closed"}
+			return
+		}
+	}
+}

sqliteclidriver/eventcmd_test.go

@@ -0,0 +1,69 @@
+package sqliteclidriver
+
+import (
+	"errors"
+	"io"
+	"os/exec"
+	"sync"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestEventCmd(t *testing.T) {
+	cmd := exec.Command("/bin/bash", "-c", `echo "hello world"`)
+
+	ch, _, err := ExecEvents(cmd)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var consume []processEvent
+	for ev := range ch {
+		consume = append(consume, ev)
+	}
+
+	expect := []processEvent{
+		processEvent{evtype: evtypeStdout, data: []byte("hello world\n")},
+		processEvent{evtype: evtypeStdout, err: io.EOF},
+		processEvent{evtype: evtypeStderr, err: io.EOF},
+		processEvent{evtype: evtypeExit, err: nil},
+	}
+
+	require.EqualValues(t, expect, consume)
+}
+
+func TestEventCmdStdin(t *testing.T) {
+	cmd := exec.Command("/usr/bin/tr", "a-z", "A-Z")
+
+	ch, pw, err := ExecEvents(cmd)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	wg := sync.WaitGroup{}
+	wg.Add(1)
+	var consume []processEvent
+	go func() {
+		defer wg.Done()
+
+		for ev := range ch {
+			if ev.err != nil && errors.Is(ev.err, io.EOF) {
+				continue // skip flakey ordering of two EOF statements
+			}
+			consume = append(consume, ev)
+		}
+	}()
+
+	pw.Write([]byte("hello world"))
+	pw.Close()
+
+	wg.Wait()
+
+	expect := []processEvent{
+		processEvent{evtype: evtypeStdout, data: []byte("HELLO WORLD")},
+		processEvent{evtype: evtypeExit, err: nil},
+	}
+
+	require.EqualValues(t, expect, consume)
+}

sqliteclidriver/orderedkv.go

@@ -0,0 +1,85 @@
+package sqliteclidriver
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+)
+
+type Pair struct {
+	Key   string
+	Value any
+}
+
+type OrderedKV []Pair
+
+func (o *OrderedKV) UnmarshalJSON(data []byte) error {
+	// Rough estimate malloc size based on number of `:`
+	// This is a lower bound since there might be nested elements
+	var elCount int64
+	for _, c := range data {
+		if c == ':' {
+			elCount += 1
+		}
+	}
+
+	*o = make([]Pair, 0, elCount)
+
+	// Parse the initial opening { delimiter from the JSON stream
+
+	reader := bytes.NewReader(data)
+	dec := json.NewDecoder(reader)
+
+	tok, err := dec.Token()
+	if err != nil {
+		return fmt.Errorf("expected '{': %w", err)
+	}
+	if d, ok := tok.(json.Delim); !ok || (rune(d) != '{') {
+		return fmt.Errorf("expected '{', got %v", tok)
+	}
+
+	// Read remaining content
+
+	for dec.More() {
+
+		var p Pair
+
+		// Parse key: either string or Delim('}')
+		tok, err := dec.Token()
+		if err != nil {
+			return fmt.Errorf("expected '{': %w", err)
+		}
+		switch tok := tok.(type) {
+		case json.Delim:
+			if rune(tok) == '}' {
+				// Finished
+				break
+			}
+			// Something else
+			return fmt.Errorf("expected string or }, got %v", tok)
+
+		case string:
+			// Valid key
+			p.Key = tok
+
+		default:
+			return fmt.Errorf("expected string or }, got %v", tok)
+		}
+
+		// Parse value (any)
+		err = dec.Decode(&p.Value)
+		if err != nil {
+			return err
+		}
+
+		*o = append(*o, p)
+	}
+
+	// Assert that there is no remaining content
+	if reader.Len() != 0 {
+		return fmt.Errorf("Unexpected trailing data (%d bytes remaining)", reader.Len())
+	}
+
+	// Done
+	return nil
+}

sqliteclidriver/orderedkv_test.go

@@ -0,0 +1,30 @@
+package sqliteclidriver
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestOrderedKV(t *testing.T) {
+
+	input := `
+{
+	"zzz": "foo",
+	"aaa": "bar"
+}
+`
+	var got OrderedKV
+	err := json.Unmarshal([]byte(input), &got)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expect := OrderedKV{
+		Pair{Key: "zzz", Value: "foo"},
+		Pair{Key: "aaa", Value: "bar"},
+	}
+
+	require.EqualValues(t, expect, got)
+}

sqliteclidriver/sqliteclidriver.go

@@ -0,0 +1,378 @@
+// sqliteclidriver is a database/sql driver for SQLite implemented on top of
+// the sqlite3 command-line tool. This allows it to be used over remote SSH
+// connections.
+//
+// Functionality is limited.
+//
+// Known caveats:
+// - Bad error handling
+// - Few supported types
+// - Has to escape parameters for CLI instead of preparing them, so not safe for untrusted usage
+// - No context handling
+// - No way to configure sqlite3 command line path
+package sqliteclidriver
+
+import (
+	"bytes"
+	"context"
+	"database/sql"
+	"database/sql/driver"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"os/exec"
+
+	"yvbolt/lexer"
+
+	"github.com/google/uuid"
+)
+
+var ErrNotSupported = errors.New("Not supported")
+
+//
+
+type SCDriver struct{}
+
+func (d *SCDriver) Open(connectionString string) (driver.Conn, error) {
+	// TODO support custom binpath from our connection string
+
+	cmd := exec.Command(`/usr/bin/sqlite3`, `-noheader`, `-json`, connectionString) // n.b. doesn't support `--`
+
+	chEvents, pw, err := ExecEvents(cmd)
+	if err != nil {
+		return nil, err
+	}
+
+	return &SCConn{
+		listen: chEvents,
+		w:      pw,
+	}, nil
+}
+
+var _ driver.Driver = &SCDriver{} // interface assertion
+
+func init() {
+	sql.Register("sqliteclidriver", &SCDriver{})
+}
+
+//
+
+type SCConnector struct {
+	connectionString string
+	driver           *SCDriver
+}
+
+func (c *SCConnector) Connect(context.Context) (driver.Conn, error) {
+	return c.driver.Open(c.connectionString)
+}
+
+func (c *SCConnector) Driver() driver.Driver {
+	return c.driver
+}
+
+var _ driver.Connector = &SCConnector{} // interface assertion
+
+//
+
+type SCConn struct {
+	listen <-chan processEvent
+	w      io.WriteCloser
+}
+
+func (c *SCConn) Prepare(query string) (driver.Stmt, error) {
+	f, err := lexer.Fields(query) // Rely on the query's escaping still being present
+	if err != nil {
+		return nil, err
+	}
+
+	if len(f) == 0 {
+		return nil, errors.New("Empty query")
+	}
+
+	if f[len(f)-1] != ";" {
+		f = append(f, ";") // Query must end in semicolon
+	}
+
+	return &SCStmt{
+		conn:  c,
+		query: f,
+	}, nil
+}
+
+func (c *SCConn) Close() error {
+	return c.w.Close()
+}
+
+func (c *SCConn) Begin() (driver.Tx, error) {
+	return nil, ErrNotSupported
+}
+
+var _ driver.Conn = &SCConn{} // interface assertion
+
+//
+
+type SCStmt struct {
+	conn  *SCConn
+	query []string
+}
+
+func (s *SCStmt) Close() error {
+	return nil
+}
+
+func (s *SCStmt) NumInput() int {
+	var ct int = 0
+	for _, token := range s.query {
+		if token == `?` {
+			ct++
+		}
+	}
+
+	return ct
+}
+
+func (s *SCStmt) buildQuery(args []driver.Value) ([]byte, error) {
+
+	// Embed query params
+	// WARNING: Not secure against injection? That's not a security boundary
+	// for the purposes of yvbolt, but maybe for other package users
+
+	var querybuilder bytes.Buffer
+
+	for _, token := range s.query {
+		if token == `?` {
+			if len(args) == 0 {
+				return nil, errors.New("Not enough arguments")
+			}
+
+			arg := args[0]
+			args = args[1:]
+
+			// Format the argument
+			if szarg, ok := arg.(string); ok {
+				querybuilder.WriteString(lexer.Quote(szarg))
+
+			} else if intarg, ok := arg.(int64); ok {
+				querybuilder.WriteString(fmt.Sprintf("%d", intarg))
+
+			} else if flarg, ok := arg.(float64); ok {
+				querybuilder.WriteString(fmt.Sprintf("%f", flarg))
+
+			} else {
+				return nil, fmt.Errorf("Parameter %v has unsupported type", arg)
+			}
+
+		} else {
+			// Normal token
+			querybuilder.WriteString(token)
+		}
+
+		// Whitespace
+		querybuilder.WriteByte(' ')
+	}
+
+	if len(args) != 0 {
+		return nil, errors.New("Too many arguments")
+	}
+
+	// Swap final whitespace for a \n
+	submit := querybuilder.Bytes()
+	submit[len(submit)-1] = '\n'
+
+	return submit, nil
+}
+
+func (s *SCStmt) Exec(args []driver.Value) (driver.Result, error) {
+
+	submit, err := s.buildQuery(args)
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = io.CopyN(s.conn.w, bytes.NewReader(submit), int64(len(submit)))
+	if err != nil {
+		return nil, fmt.Errorf("Write: %w", err)
+	}
+
+	// Drain stdout
+	// TODO
+
+	// Drain stderr
+	// TODO
+
+	return &SCResult{}, nil
+}
+
+func (s *SCStmt) Query(args []driver.Value) (driver.Rows, error) {
+	ctx := context.Background()
+
+	submit, err := s.buildQuery(args)
+	if err != nil {
+		return nil, err
+	}
+
+	// If there are no results to the query, the sqlite3 -json mode does not
+	// print anything on stdout at all and we would hang forever
+	// Add a followup sentinel query that we can detect
+	const sentinelKey = `__sqliteclidriver_sentinel`
+	sentinelVal := uuid.Must(uuid.NewRandom()).String()
+	submit = append(submit, []byte(fmt.Sprintf("SELECT \"%s\" AS %s;\n", sentinelVal, sentinelKey))...)
+
+	//
+
+	_, err = io.CopyN(s.conn.w, bytes.NewReader(submit), int64(len(submit)))
+	if err != nil {
+		return nil, fmt.Errorf("Write: %w", err)
+	}
+
+	// Consume process events until either error or the json decoder is satisfied
+	pr, pw := io.Pipe()
+
+	listenContext, listenContextCancel := context.WithCancel(ctx) // Use to stop signalling once json decoder is satisfied
+
+	go func() {
+		defer pw.Close()
+		for {
+			select {
+			case msg, ok := <-s.conn.listen:
+				if !ok {
+					pw.CloseWithError(fmt.Errorf("process already closed"))
+					return
+				}
+				if msg.err != nil {
+					pw.CloseWithError(msg.err)
+					return
+				}
+
+				if msg.evtype == evtypeStdout {
+					_, err := io.CopyN(pw, bytes.NewReader(msg.data), int64(len(msg.data)))
+					if err != nil {
+						pw.CloseWithError(msg.err)
+						return
+					}
+
+				} else {
+					// Anything else (process event / stderr)
+					// Throw
+					pw.CloseWithError(msg)
+					return
+				}
+
+			case <-listenContext.Done():
+				return
+			}
+		}
+	}()
+
+	// We expect some kind of thing on stdout
+	// If something happens on stderr, or to the process, pr will read an error
+	ret := []OrderedKV{}
+	decoder := json.NewDecoder(pr)
+	err = decoder.Decode(&ret)
+	if err != nil {
+		return nil, err
+	}
+
+	// Check if this was the data or the sentinel
+	wasSentinel := false
+	if len(ret) > 0 && len(ret[0]) > 0 && ret[0][0].Key == sentinelKey {
+		if check, ok := ret[0][0].Value.(string); ok && check == sentinelVal {
+			// It was the sentinel
+			wasSentinel = true
+			// Nothing more to parse
+		}
+	}
+
+	if wasSentinel {
+		// There was no data.
+		// Wipe out `ret`
+		ret = nil
+
+	} else {
+		// There was data.
+		// Need to decode again (from the same decoder reader) until we find the sentinel
+		surplus := []map[string]any{}
+		err = decoder.Decode(&surplus)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	listenContextCancel()
+
+	// Drain stderr
+	// TODO
+
+	// Come up with a canonical ordering for the columns after json.NewDecoder
+	// wiped it out for us
+	// FIXME use a different json parsing library
+
+	var columnNames []string
+	if len(ret) > 0 {
+		for _, cell := range ret[0] {
+			columnNames = append(columnNames, cell.Key)
+		}
+	}
+
+	//
+
+	return &SCRows{
+		idx:     0,
+		columns: columnNames,
+		data:    ret,
+	}, nil
+}
+
+var _ driver.Stmt = &SCStmt{} // interface assertion
+
+//
+
+type SCResult struct{}
+
+func (r *SCResult) LastInsertId() (int64, error) {
+	return 0, ErrNotSupported
+}
+
+func (r *SCResult) RowsAffected() (int64, error) {
+	return 0, ErrNotSupported
+}
+
+var _ driver.Result = &SCResult{} // interface assertion
+
+//
+
+type SCRows struct {
+	idx     int
+	columns []string
+	data    []OrderedKV
+}
+
+func (r *SCRows) Columns() []string {
+	return r.columns
+}
+
+func (r *SCRows) Close() error {
+	r.idx = 0
+	r.data = nil
+	return nil
+}
+
+func (r *SCRows) Next(dest []driver.Value) error {
+	if r.idx >= len(r.data) {
+		return io.EOF
+	}
+
+	if len(dest) != len(r.data[r.idx]) {
+		return errors.New("Wrong number of arguments to Next()")
+	}
+
+	for i := 0; i < len(dest); i++ {
+		cell := r.data[r.idx][i]
+
+		dest[i] = cell.Value
+	}
+
+	r.idx++
+	return nil
+}

sqliteclidriver/sqliteclidriver_test.go

@@ -0,0 +1,78 @@
+package sqliteclidriver
+
+import (
+	"database/sql"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestSqliteCliDriver(t *testing.T) {
+	db, err := sql.Open("sqliteclidriver", ":memory:")
+	require.NoError(t, err)
+
+	_, err = db.Exec(`CREATE TABLE my_test_table ( id INTEGER PRIMARY KEY, extra TEXT NOT NULL );`)
+	require.NoError(t, err)
+
+	_, err = db.Exec(`INSERT INTO my_test_table (id, extra) VALUES ( ? , ? ), ( ? , ? );`, 1337, "abcdef", 9001, "whoop")
+	require.NoError(t, err)
+
+	// Repeat this part to ensure we can make followup queries on the same connection
+	for i := 0; i < 3; i++ {
+
+		res, err := db.Query(`SELECT * FROM my_test_table ORDER BY id ASC;`)
+		require.NoError(t, err)
+
+		cols, err := res.Columns()
+		require.NoError(t, err)
+		require.EqualValues(t, cols, []string{"id", "extra"})
+
+		var rowCount int = 0
+
+		for res.Next() {
+			rowCount++
+
+			var idVal int
+			var extraVal string
+			err = res.Scan(&idVal, &extraVal)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			switch rowCount {
+			case 1:
+				require.EqualValues(t, 1337, idVal)
+				require.EqualValues(t, "abcdef", extraVal)
+
+			case 2:
+				require.EqualValues(t, 9001, idVal)
+				require.EqualValues(t, "whoop", extraVal)
+
+			}
+		}
+
+		require.Equal(t, rowCount, 2)
+
+	}
+}
+
+func TestSqliteCliDriverNoResults(t *testing.T) {
+	db, err := sql.Open("sqliteclidriver", ":memory:")
+	require.NoError(t, err)
+
+	// Repeat this part to ensure we can make followup queries on the same connection
+	for i := 0; i < 3; i++ {
+		_, err = db.Query(`SELECT 1 AS expect_no_result WHERE 1=2`)
+		require.NoError(t, err)
+
+		// Mix of results and no-results
+		rr := db.QueryRow(`SELECT 1 AS expect_result WHERE 1=1`)
+		require.NoError(t, rr.Err())
+
+		var result int64
+		err = rr.Scan(&result)
+		require.NoError(t, err)
+		require.EqualValues(t, result, 1)
+	}
+
+}

util_types.go

@@ -0,0 +1,21 @@
+package main
+
+// box_interface creates a slice where all elements of the input slice are boxed
+// in an interface{} type.
+func box_interface[T any](input []T) []interface{} {
+	ret := make([]interface{}, 0, len(input))
+	for _, v := range input {
+		ret = append(ret, v)
+	}
+	return ret
+}
+
+func int32slice_contains(haystack []int32, needle int32) bool {
+	for _, v := range haystack {
+		if v == needle {
+			return true
+		}
+	}
+	
+	return false
+}

util_vcl.go

@@ -0,0 +1,123 @@
+package main
+
+import (
+	"runtime"
+
+	"github.com/ying32/govcl/vcl"
+	"github.com/ying32/govcl/vcl/types"
+	"github.com/ying32/govcl/vcl/types/colors"
+)
+
+const (
+	MY_SPACING = 6
+	MY_HEIGHT  = 90
+	MY_WIDTH   = 180
+
+	MAX_AUTO_COL_WIDTH = 240
+)
+
+// vcl_row makes a TPanel row inside the target component.
+func vcl_row(owner vcl.IWinControl, top int32) *vcl.TPanel {
+
+	r := vcl.NewPanel(owner)
+	r.SetParent(owner)
+	r.SetBorderStyle(types.BsNone)
+	r.SetBevelInner(types.BvNone)
+	r.SetBevelOuter(types.BvNone)
+	r.SetAlign(types.AlTop)
+	r.SetTop(top)
+	r.SetAutoSize(true)
+
+	return r
+}
+
+// vcl_menuitem makes a child TMenuItem inside the parent menu.
+func vcl_menuitem(parent *vcl.TMenuItem, caption string, imageIndex int32, onClick vcl.TNotifyEvent) *vcl.TMenuItem {
+	m := vcl.NewMenuItem(parent)
+	m.SetCaption(caption)
+	if imageIndex != -1 {
+		m.SetImageIndex(imageIndex)
+	}
+	if onClick != nil {
+		m.SetOnClick(onClick)
+	}
+	parent.Add(m)
+
+	return m
+}
+
+// vcl_menuseparator adds a separator to the parent TMenuItem.
+func vcl_menuseparator(parent *vcl.TMenuItem) *vcl.TMenuItem {
+	s := vcl.NewMenuItem(parent)
+	s.SetCaption("-") // Creates separator
+	parent.Add(s)
+
+	return s
+}
+
+func vcl_default_tab_background() types.TColor {
+	if runtime.GOOS == "windows" {
+		// Assuming that uxtheme is loaded
+		// @ref https://stackoverflow.com/a/20332712
+		// return colors.ClBtnHighlight
+
+		// None of the colors.** constants seem to be quite right on a test
+		// Windows 11 machine - should be #f9f9f9
+		return 0x00f9f9f9
+	} else {
+		return colors.ClBtnFace // 0x00f0f0f0
+	}
+}
+
+func vcl_stringgrid_clear(d *vcl.TStringGrid) {
+	d.SetFixedCols(0) // No left-hand cols
+	d.SetRowCount(1)  // The 0th row is the column headers
+	d.SetEnabled(false)
+	d.Columns().Clear()
+	d.Invalidate()
+}
+
+func vcl_stringgrid_columnwidths(d *vcl.TStringGrid) {
+	// Skip slow processing for very large result sets
+	if d.RowCount() > 1000 {
+		return
+	}
+
+	d.AutoAdjustColumns()
+
+	// AutoAdjustColumns will leave some columns massively too large by themselves
+	// Reign them back in
+	ct := d.Columns().Count()
+	for i := int32(0); i < ct; i++ {
+		if d.ColWidths(i) > MAX_AUTO_COL_WIDTH {
+			d.SetColWidths(i, MAX_AUTO_COL_WIDTH)
+		}
+	}
+}
+
+func vcl_confirm_dialog(sender vcl.IComponent, title string, message string) bool {
+
+	dlg := vcl.NewTaskDialog(sender)
+	dlg.SetCaption(APPNAME)
+	dlg.SetTitle(title)
+	dlg.SetText(message)
+	dlg.SetCommonButtons(types.NewSet())
+
+	yesBtn := dlg.Buttons().Add()
+	yesBtn.SetCaption("Confirm")
+	yesBtn.SetModalResult(types.MrYes)
+
+	noBtn := dlg.Buttons().Add()
+	noBtn.SetCaption("Cancel")
+	noBtn.SetModalResult(types.MrCancel)
+
+	ret := dlg.Execute()
+	if !ret {
+		return false // dialog closed
+	}
+	if dlg.ModalResult() != types.MrYes {
+		return false // other button clicked
+	}
+
+	return true // confirmed
+}

versions.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"runtime/debug"
+)
+
+var (
+	version_Pebble string
+)
+
+func init() {
+
+	// ReadBuildInfo still works even with `-ldflags '-s -w'`.
+	mm, ok := debug.ReadBuildInfo()
+	if !ok {
+		panic("Missing build info")
+	}
+
+	for _, dep := range mm.Deps {
+		switch dep.Path {
+		case "github.com/cockroachdb/pebble":
+			version_Pebble = dep.Version
+		}
+	}
+}