doc/README: add v0.7.0 download links

.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)
+.DEFAULT_GOAL := dist
+
+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

@@ -1,25 +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:
   - Badger v4
   - Bolt
-    - Full compatibility via the upstream [etcd-io/bbolt](https://github.com/etcd-io/bbolt) library
     - Recursive bucket support
-  - SQLite
+    - Option to open as readonly for shared access
-    - Uses CGo if available or modernc.org if not
+    - 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
 
@@ -29,7 +34,7 @@ This project redistributes images from the famfamfam/silk icon set under the [CC
 
 This project includes trademarked logo images for each supported database type.
 
-## Usage
+## 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)
@@ -38,6 +43,51 @@ This project includes trademarked logo images for each supported database type.
 
 ## 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
+
+[⬇️ Download for Windows x86_64](https://git.ivysaur.me/code.ivysaur.me/yvbolt/releases/download/v0.7.0/yvbolt.win64.zip)
+
+[⬇️ Download for Linux x86_64](https://git.ivysaur.me/code.ivysaur.me/yvbolt/releases/download/v0.7.0/yvbolt.linux64.tar.xz)
+
+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

TODO

@@ -1,24 +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
+		- CLI using psql
 	- MSSQL (recursive navigation for instances)
-- SSH tunnels
+	- Other K/V stores from https://github.com/smallnest/kvbench 
-- Special actions
+	- Windows registry
-	- Refresh tables
+	- LDAP
-	- Per-db actions e.g. compact, export backup
+- Connection dialog
-	- Per-table actions e.g. drop table
+	- SSH tunnels
-- Sqlite cli driver for ssh tunnel
+	- Badger encryption key dialog
+	- Pebble: connection options dialog
+- SQLite CLI driver:
+	- Context support
+	- 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
-- Makefile to cross-compile release binaries in docker
+- SQLite: drop table doesn't autorefresh nav since callback is late
-- Build own liblcl binaries in docker
+- Build
-- Win32 icon resource
+	- Build own liblcl binaries in docker
-- Faster virtual rendering
+	- Win32 icon resource
-	- https://github.com/ying32/govcl/blob/master/samples/listviewvirtualdata/main.go
+		- 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);`

db_badger.go

@@ -7,7 +7,6 @@ import (
 
 	"github.com/dgraph-io/badger/v4"
 	"github.com/ying32/govcl/vcl"
-	"github.com/ying32/govcl/vcl/types"
 )
 
 type badgerLoadedDatabase struct {
@@ -34,7 +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
 
@@ -42,25 +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
@@ -71,9 +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
 			})
@@ -84,12 +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) {
@@ -103,8 +94,8 @@ 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() {

db_bolt.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"path/filepath"
 	"sort"
@@ -9,11 +10,14 @@ import (
 	"unsafe"
 
 	"github.com/ying32/govcl/vcl"
-	"github.com/ying32/govcl/vcl/types"
 	"go.etcd.io/bbolt"
 	"go.etcd.io/bbolt/version"
 )
 
+const (
+	boltFilter = "Bolt database|*.db|All files|*.*"
+)
+
 type boltLoadedDatabase struct {
 	displayName string
 	path        string
@@ -39,7 +43,7 @@ func (ld *boltLoadedDatabase) Keepalive(ndata *navData) {
 	ld.arena = append(ld.arena, ndata)
 }
 
-func (ld *boltLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
+func (ld *boltLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
 
 	// Load properties
 
@@ -48,19 +52,11 @@ func (ld *boltLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 	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.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(tx *bbolt.Tx) error {
 		b := boltTargetBucket(tx, ndata.bucketPath)
@@ -70,23 +66,74 @@ func (ld *boltLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 		}
 
 		// Valid
-		f.contentBox.Clear()
-
 		c := b.Cursor()
 		for k, v := c.First(); k != nil; k, v = c.Next() {
-			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
 	})
 	if err != nil {
-		vcl.ShowMessage(fmt.Sprintf("Failed to load data for bucket %q: %s", bucketDisplayName, err.Error()))
+		return err
-		return
 	}
 
 	// 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) {
@@ -94,8 +141,55 @@ func (ld *boltLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
 	return boltChildBucketNames(ld.db, ndata.bucketPath)
 }
 
-func (ld *boltLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
+func (ld *boltLoadedDatabase) NavContext(ndata *navData) (ret []contextAction, err error) {
-	vcl.ShowMessage("Bolt doesn't support querying")
+	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() {
@@ -107,9 +201,15 @@ var _ loadedDatabase = &boltLoadedDatabase{} // interface assertion
 
 //
 
-func (f *TMainForm) boltAddDatabaseFromFile(path string) {
+func (f *TMainForm) boltAddDatabaseFromFile(path string, readonly bool) {
 	// TODO load in background thread to stop blocking the UI
-	db, err := bbolt.Open(path, 0644, &bbolt.Options{Timeout: 1 * time.Second})
+
+	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
@@ -120,6 +220,9 @@ func (f *TMainForm) boltAddDatabaseFromFile(path string) {
 		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
@@ -169,13 +272,13 @@ func boltChildBucketNames(db *bbolt.DB, path []string) ([]string, error) {
 		if len(path) > 0 {
 			b := tx.Bucket([]byte(path[0]))
 			if b == nil {
-				return fmt.Errorf("Unexpected missing root bucket %q", path[0])
+				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("Unexpected missing bucket %q", strings.Join(path[0:i], `/`))
+					return fmt.Errorf("Bucket %q: %w", strings.Join(path[0:i], `/`), ErrNavNotExist)
 				}
 			}
 

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

@@ -7,7 +7,7 @@ import (
 type noLoadedDatabase struct{}
 
 func (n *noLoadedDatabase) DisplayName() string {
-	return "yvbolt"
+	return APPNAME
 }
 
 func (n *noLoadedDatabase) DriverName() string {
@@ -18,19 +18,19 @@ func (n *noLoadedDatabase) RootElement() *vcl.TTreeNode {
 	return nil
 }
 
-func (n *noLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
+func (n *noLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
 	f.propertiesBox.SetText("Open a database to get started...")
-	f.contentBox.SetEnabled(false)
+	return nil
-	f.contentBox.Clear()
-}
-
-func (n *noLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
 }
 
 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) {
 }
 

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

@@ -4,12 +4,12 @@ import (
 	"context"
 	"fmt"
 	"strconv"
-	"strings"
 	"unsafe"
 
+	"yvbolt/lexer"
+
 	"github.com/redis/go-redis/v9"
 	"github.com/ying32/govcl/vcl"
-	"github.com/ying32/govcl/vcl/types"
 )
 
 type redisLoadedDatabase struct {
@@ -40,83 +40,71 @@ func (ld *redisLoadedDatabase) Keepalive(ndata *navData) {
 	ld.arena = append(ld.arena, ndata)
 }
 
-func (ld *redisLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
+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 {
-			vcl.ShowMessage(fmt.Sprintf("Retreiving database info: %v", err))
+			return fmt.Errorf("Retreiving database info: %w", err)
-			return
 		}
 
 		f.propertiesBox.SetText(infostr)
 
-		// Disable data tab
+		// Leave data tab disabled (default behaviour)
-		f.contentBox.SetEnabled(false)
+		return nil
-		f.contentBox.Clear()
 
 	} 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 {
-			vcl.ShowMessage(fmt.Sprintf("Switching to database %q: %v", ndata.bucketPath[0], err))
+			return fmt.Errorf("Switching to database %q: %w", ndata.bucketPath[0], err)
-			return
 		}
 
 		allKeys, err := ld.db.Keys(ctx, "*").Result()
 		if err != nil {
-			vcl.ShowMessage(fmt.Sprintf("Listing keys in database %q: %v", ndata.bucketPath[0], err))
+			return fmt.Errorf("Listing keys in database %q: %w", ndata.bucketPath[0], err)
-			return
 		}
 
 		f.propertiesBox.SetText(fmt.Sprintf("Database %s\nTotal keys: %d\n", ndata.bucketPath[0], len(allKeys)))
 
 		// Redis always uses Key + Value as the columns
 
-		f.contentBox.SetEnabled(false)
-		f.contentBox.Clear()
-
-		f.contentBox.Columns().Clear()
 		colKey := f.contentBox.Columns().Add()
-		colKey.SetCaption("Key")
+		colKey.Title().SetCaption("Key")
-		colKey.SetWidth(MY_WIDTH)
-		colKey.SetAlignment(types.TaLeftJustify)
 		colType := f.contentBox.Columns().Add()
-		colType.SetCaption("Type")
+		colType.Title().SetCaption("Type")
 		colVal := f.contentBox.Columns().Add()
-		colVal.SetCaption("Value")
+		colVal.Title().SetCaption("Value")
 
 		for _, key := range allKeys {
 			typeName, err := ld.db.Type(ctx, key).Result()
 			if err != nil {
-				vcl.ShowMessage(fmt.Sprintf("Loading %q/%q: %v", ndata.bucketPath[0], key, err))
+				return fmt.Errorf("Loading %q/%q: %w", ndata.bucketPath[0], key, err)
-				return
 			}
 
-			dataEntry := f.contentBox.Items().Add()
+			rpos := f.contentBox.RowCount()
-			dataEntry.SetCaption(key) // formatUtf8
+			f.contentBox.SetRowCount(rpos + 1)
-			dataEntry.SubItems().Add(typeName)
+			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 {
-					vcl.ShowMessage(fmt.Sprintf("Loading %q/%q: %v", ndata.bucketPath[0], key, err))
+					return fmt.Errorf("Loading %q/%q: %w", ndata.bucketPath[0], key, err)
-					return
 				}
-				dataEntry.SubItems().Add(val)
+				f.contentBox.SetCells(2, rpos, val)
 
 			case "hash":
 				val, err := ld.db.HGetAll(ctx, key).Result()
 				if err != nil {
-					vcl.ShowMessage(fmt.Sprintf("Loading %q/%q: %v", ndata.bucketPath[0], key, err))
+					return fmt.Errorf("Loading %q/%q: %w", ndata.bucketPath[0], key, err)
-					return
 				}
 				// It's a map[string]string
-				dataEntry.SubItems().Add(formatAny(val))
+				f.contentBox.SetCells(2, rpos, formatAny(val))
 
 			case "lists":
 				fallthrough
@@ -128,17 +116,18 @@ func (ld *redisLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 				fallthrough
 
 			default:
-				dataEntry.SubItems().Add("<<<other object type>>>")
+				f.contentBox.SetCells(2, rpos, "<<<other object type>>>")
 			}
 
 		}
 
 		// Valid
+		vcl_stringgrid_columnwidths(f.contentBox)
 		f.contentBox.SetEnabled(true)
+		return nil
 
 	} else {
-		vcl.ShowMessage(fmt.Sprintf("Unexpected nav position %q", ndata.bucketPath))
+		return fmt.Errorf("Unexpected nav position %q", ndata.bucketPath)
-		return
 
 	}
 }
@@ -165,45 +154,54 @@ func (ld *redisLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
 	}
 }
 
-func (ld *redisLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
+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
-	// TODO This needs to better handle quotes, escaping, ...
+	fields, err := lexer.Fields(query)
-	fields := strings.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 {
-		vcl.ShowMessage(fmt.Sprintf("The redis query returned an error: %v", err))
+		return fmt.Errorf("The redis query returned an error: %w", err)
-		return
 	}
 
-	resultArea.SetEnabled(false)
+	vcl_stringgrid_clear(resultArea)
-	resultArea.Clear()
 
-	resultArea.Columns().Clear()
 	colVal := resultArea.Columns().Add()
-	colVal.SetCaption("Result")
+	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 {
-			cell := resultArea.Items().Add()
+
-			cell.SetCaption(single) // formatUtf8
+			rpos := resultArea.RowCount()
+			resultArea.SetRowCount(rpos + 1)
+			resultArea.SetCells(0, rpos, formatUtf8([]byte(single)))
 		}
 
 	default:
 		// Single value
-		dataEntry := resultArea.Items().Add()
+		rpos := resultArea.RowCount()
-		dataEntry.SetCaption(formatAny(ret)) // formatUtf8
+		resultArea.SetRowCount(rpos + 1)
+		resultArea.SetCells(0, rpos, formatAny(ret)) // formatUtf8
 
 	}
 
+	vcl_stringgrid_columnwidths(resultArea)
 	resultArea.SetEnabled(true)
+
+	return nil
 }
 
 func (ld *redisLoadedDatabase) Close() {

db_sqlite.go

@@ -1,17 +1,22 @@
 package main
 
 import (
+	"context"
 	"database/sql"
+	"errors"
 	"fmt"
 	"path/filepath"
+	"strings"
 	"unsafe"
 
+	_ "yvbolt/sqliteclidriver"
+
 	"github.com/ying32/govcl/vcl"
-	"github.com/ying32/govcl/vcl/types"
 )
 
 const (
 	sqliteTablesCaption = "Tables"
+	sqliteFilter        = "SQLite database|*.db;*.db3;*.sqlite;*.sqlite3|All files|*.*"
 )
 
 type sqliteLoadedDatabase struct {
@@ -35,19 +40,17 @@ func (ld *sqliteLoadedDatabase) Keepalive(ndata *navData) {
 	ld.arena = append(ld.arena, ndata)
 }
 
-func (ld *sqliteLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
+func (ld *sqliteLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) error {
 
 	if len(ndata.bucketPath) == 0 {
 		// Top-level
 		f.propertiesBox.SetText("Please select...")
-		f.contentBox.SetEnabled(false)
+		return nil
-		f.contentBox.Clear()
 
 	} else if len(ndata.bucketPath) == 1 {
 		// Category (tables, ...)
 		f.propertiesBox.SetText("Please select...")
-		f.contentBox.SetEnabled(false)
+		return nil
-		f.contentBox.Clear()
 
 	} else if len(ndata.bucketPath) == 2 && ndata.bucketPath[0] == sqliteTablesCaption {
 		// Render for specific table
@@ -64,17 +67,13 @@ func (ld *sqliteLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 		// 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 fmt.Errorf("Failed to load columns for table %q: %w", tableName)
-			return
 		}
 
 		populateColumns(columnNames, f.contentBox)
@@ -83,26 +82,28 @@ func (ld *sqliteLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
 		// 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)
+		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 fmt.Errorf("Failed to load data for table %q: %w", tableName, err)
-			return
 		}
 		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)
+	colr, err := ld.db.Query(`SELECT name FROM pragma_table_info( ? )`, tableName)
 	if err != nil {
 		return nil, fmt.Errorf("Query: %w", err)
 	}
@@ -127,17 +128,14 @@ func (ld *sqliteLoadedDatabase) sqliteGetColumnNamesForTable(tableName string) (
 	return ret, nil
 }
 
-func populateColumns(names []string, dest *vcl.TListView) {
+func populateColumns(names []string, dest *vcl.TStringGrid) {
-	dest.Columns().Clear()
 	for _, columnName := range names {
 		col := dest.Columns().Add()
-		col.SetCaption(columnName)
+		col.Title().SetCaption(columnName)
-		col.SetWidth(MY_WIDTH)
-		col.SetAlignment(types.TaLeftJustify)
 	}
 }
 
-func populateRows(rr *sql.Rows, dest *vcl.TListView) {
+func populateRows(rr *sql.Rows, dest *vcl.TStringGrid) {
 
 	numColumns := int(dest.Columns().Count())
 
@@ -154,10 +152,10 @@ func populateRows(rr *sql.Rows, dest *vcl.TListView) {
 			return
 		}
 
-		dataEntry := dest.Items().Add()
+		rpos := dest.RowCount()
-		dataEntry.SetCaption(formatAny(fields[0]))
+		dest.SetRowCount(rpos + 1)
-		for i := 1; i < len(fields); i += 1 {
+		for i := 0; i < len(fields); i += 1 {
-			dataEntry.SubItems().Add(formatAny(fields[i]))
+			dest.SetCells(int32(i), rpos, formatAny(fields[i]))
 		}
 
 	}
@@ -167,29 +165,149 @@ func populateRows(rr *sql.Rows, dest *vcl.TListView) {
 	}
 }
 
-func (ld *sqliteLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
+func (ld *sqliteLoadedDatabase) ExecQuery(query string, resultArea *vcl.TStringGrid) error {
 	rr, err := ld.db.Query(query)
 	if err != nil {
-		vcl.ShowMessage(err.Error())
+		return err
-		return
 	}
 
 	defer rr.Close()
 
-	resultArea.SetEnabled(false)
+	vcl_stringgrid_clear(resultArea)
-	resultArea.Clear()
 
 	columns, err := rr.Columns()
 	if err != nil {
-		vcl.ShowMessage(err.Error())
+		return err
-		return
 	}
 
 	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) {
@@ -230,6 +348,54 @@ func (ld *sqliteLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
 	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
@@ -239,10 +405,15 @@ var _ loadedDatabase = &sqliteLoadedDatabase{} // interface assertion
 
 //
 
-func (f *TMainForm) sqliteAddDatabaseFromFile(path string) {
+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("sqlite3", path)
+	db, err := sql.Open(driver, path)
 	if err != nil {
 		vcl.ShowMessage(fmt.Sprintf("Failed to load database '%s': %s", path, err.Error()))
 		return

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

@@ -3,39 +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/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c // 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/redis/go-redis/v9 v9.5.3 // 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=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+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=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
+cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
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+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
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+cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
+cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
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 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
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 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
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 github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
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 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
+github.com/cockroachdb/datadriven v1.0.3-0.20230801171734-e384cf455877 h1:1MLK4YpFtIEo3ZtMA5C795Wtv5VuUnrXX7mQG+aHg6o=
+github.com/cockroachdb/errors v1.11.3 h1:5bA+k2Y6r+oz/6Z/RFlNeVCesGARKuC6YymtcDrbC/I=
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+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+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=
@@ -164,3 +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 +10,28 @@ 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
@@ -45,22 +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

@@ -1,21 +1,38 @@
 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.
 type navData struct {
 	ld             loadedDatabase

main.go

@@ -1,7 +1,10 @@
 package main
 
 import (
+	"errors"
 	"fmt"
+	"runtime"
+	"runtime/debug"
 	"strings"
 	"unsafe"
 
@@ -11,18 +14,39 @@ import (
 	"github.com/ying32/govcl/vcl/types/colors"
 )
 
+const (
+	APPNAME      = "yvbolt"
+	HOMEPAGE_URL = "https://code.ivysaur.me/yvbolt"
+
+	CO_INSERT        = colors.ClYellow
+	CO_EDIT_IMPLICIT = colors.ClLightgreen
+	CO_EDIT_EXPLICIT = colors.ClGreen
+	CO_DELETE        = colors.ClRed
+)
+
 type TMainForm struct {
 	*vcl.TForm
 
-	ImageList     *vcl.TImageList
+	ImageList *vcl.TImageList
-	Menu          *vcl.TMainMenu
+	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
@@ -39,29 +63,24 @@ 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")
 
+	//
+
 	mnuFileBadger := vcl.NewMenuItem(mnuFile)
 	mnuFileBadger.SetCaption("Badger")
 	mnuFileBadger.SetImageIndex(imgVendorDgraph)
 	mnuFile.Add(mnuFileBadger)
 
-	mnuFileBadgerOpen := vcl.NewMenuItem(mnuFileBadger)
+	vcl_menuitem(mnuFileBadger, "Open database...", imgDatabaseAdd, f.OnMnuFileBadgerOpenClick)
-	mnuFileBadgerOpen.SetCaption("Open database...")
+	vcl_menuitem(mnuFileBadger, "New in-memory database", imgDatabaseAdd, f.OnMnuFileBadgerMemoryClick)
-	mnuFileBadgerOpen.SetImageIndex(imgDatabaseAdd)
-	mnuFileBadgerOpen.SetOnClick(f.OnMnuFileBadgerOpenClick)
-	mnuFileBadger.Add(mnuFileBadgerOpen)
-
-	mnuFileBadgerMemory := vcl.NewMenuItem(mnuFileBadger)
-	mnuFileBadgerMemory.SetCaption("New in-memory database")
-	mnuFileBadgerMemory.SetImageIndex(imgDatabaseAdd)
-	mnuFileBadgerMemory.SetOnClick(f.OnMnuFileBadgerMemoryClick)
-	mnuFileBadger.Add(mnuFileBadgerMemory)
 
 	//
 
@@ -70,12 +89,28 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	mnuFileBolt.SetImageIndex(imgVendorGithub)
 	mnuFile.Add(mnuFileBolt)
 
-	mnuFileBoltOpen := vcl.NewMenuItem(mnuFileBolt)
+	vcl_menuitem(mnuFileBolt, "New database...", imgDatabaseAdd, f.OnMnuFileBoltNewClick)
-	mnuFileBoltOpen.SetCaption("Open database...")
+	vcl_menuitem(mnuFileBolt, "Open database...", imgDatabaseAdd, f.OnMnuFileBoltOpenClick)
-	mnuFileBoltOpen.SetImageIndex(imgDatabaseAdd)
+	vcl_menuitem(mnuFileBolt, "Open database (read-only)...", imgDatabaseAdd, f.OnMnuFileBoltOpenReadonlyClick)
-	mnuFileBoltOpen.SetShortCutFromString("Ctrl+O")
+
-	mnuFileBoltOpen.SetOnClick(f.OnMnuFileOpenClick)
+	//
-	mnuFileBolt.Add(mnuFileBoltOpen)
+
+	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)
 
 	//
 
@@ -84,11 +119,7 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	mnuFileRedis.SetImageIndex(imgVendorRedis)
 	mnuFile.Add(mnuFileRedis)
 
-	mnuFileRedisConnect := vcl.NewMenuItem(mnuFileRedis)
+	vcl_menuitem(mnuFileRedis, "Connect...", imgDatabaseAdd, f.OnMnuFileRedisConnectClick)
-	mnuFileRedisConnect.SetCaption("Connect...")
-	mnuFileRedisConnect.SetImageIndex(imgDatabaseAdd)
-	mnuFileRedisConnect.SetOnClick(f.OnMnuFileRedisConnectClick)
-	mnuFileRedis.Add(mnuFileRedisConnect)
 
 	//
 
@@ -97,23 +128,16 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	mnuFileSqlite.SetImageIndex(imgVendorSqlite)
 	mnuFile.Add(mnuFileSqlite)
 
-	mnuFileSqliteOpen := vcl.NewMenuItem(mnuFileSqlite)
+	vcl_menuitem(mnuFileSqlite, "Open database...", imgDatabaseAdd, f.OnMnuFileSqliteOpenClick)
-	mnuFileSqliteOpen.SetCaption("Open database...")
+	vcl_menuitem(mnuFileSqlite, "New in-memory database", imgDatabaseAdd, f.OnMnuFileSqliteMemoryClick)
-	mnuFileSqliteOpen.SetImageIndex(imgDatabaseAdd)
-	mnuFileSqliteOpen.SetOnClick(f.OnMnuFileSqliteOpenClick)
-	mnuFileSqlite.Add(mnuFileSqliteOpen)
 
-	mnuFileSqliteMemory := vcl.NewMenuItem(mnuFileSqlite)
+	vcl_menuseparator(mnuFileSqlite)
-	mnuFileSqliteMemory.SetCaption("New in-memory database")
+	f.SQLiteUseCliDriver = vcl_menuitem(mnuFileSqlite, "Connect using CLI driver (experimental)", -1, nil)
-	mnuFileSqliteMemory.SetImageIndex(imgDatabaseAdd)
+	f.SQLiteUseCliDriver.SetAutoCheck(true)
-	mnuFileSqliteMemory.SetOnClick(f.OnMnuFileSqliteMemoryClick)
-	mnuFileSqlite.Add(mnuFileSqliteMemory)
 
 	//
 
-	mnuSep := vcl.NewMenuItem(mnuFile)
+	vcl_menuseparator(mnuFile)
-	mnuSep.SetCaption("-") // Creates separator
-	mnuFile.Add(mnuSep)
 
 	mnuFileExit := vcl.NewMenuItem(mnuFile)
 	mnuFileExit.SetCaption("Exit")
@@ -127,14 +151,19 @@ 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 yvbolt")
+	mnuHelpHomepage.SetCaption("About " + APPNAME)
 	mnuHelpHomepage.SetShortCutFromString("F1")
 	mnuHelpHomepage.SetOnClick(f.OnMnuHelpHomepage)
 	mnuHelp.Add(mnuHelpHomepage)
@@ -183,8 +212,8 @@ 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(true)        // Need to leave it enabled so scrolling works
+	f.propertiesBox.SetEnabled(true) // Need to leave it enabled so scrolling works
-	f.propertiesBox.SetColor(colors.ClForm) // 0x00f0f0f0
+	f.propertiesBox.SetColor(vcl_default_tab_background())
 
 	f.propertiesBox.SetBorderStyle(types.BsNone)
 	f.propertiesBox.SetScrollBars(types.SsAutoVertical)
@@ -194,14 +223,56 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	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.SetAlign(types.AlClient)     // fill remaining space
+	f.contentBox.BorderSpacing().SetRight(MY_SPACING)
-	f.contentBox.SetViewStyle(types.VsReport) // "Report style" i.e. has columns
+	f.contentBox.BorderSpacing().SetBottom(MY_SPACING)
-	f.contentBox.SetAutoWidthLastColumn(true)
+	f.contentBox.SetAlign(types.AlClient) // fill remaining space
-	f.contentBox.SetReadOnly(true)
+	f.contentBox.SetOptions(f.contentBox.Options().Include(types.GoThumbTracking, types.GoColSizing, types.GoDblClickAutoSize, types.GoEditing))
-	f.contentBox.Columns().Clear()
+	f.contentBox.SetOnPrepareCanvas(f.OnDataPrepareCanvas)
+	f.contentBox.SetOnEditingDone(f.OnDataCellEdited)
+	f.contentBox.SetOnGetEditText(f.OnDataCellEditStarting)
+	f.contentBox.SetDefaultColWidth(MY_WIDTH)
+	vcl_stringgrid_clear(f.contentBox)
 
 	queryTab := vcl.NewTabSheet(f.Tabs)
 	queryTab.SetParent(f.Tabs)
@@ -213,64 +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)
-	f.queryInput.Font().SetName("monospace")
+	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.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)
 	}
 }
 
@@ -285,11 +386,38 @@ 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) {
@@ -315,12 +443,37 @@ func (f *TMainForm) OnMnuFileExitClick(sender vcl.IObject) {
 }
 
 func (f *TMainForm) OnMnuHelpHomepage(sender vcl.IObject) {
-	err := browser.OpenURL("https://code.ivysaur.me/yvbolt")
+	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
 
@@ -330,15 +483,43 @@ func (f *TMainForm) OnNavContextPopup(sender vcl.IObject, mousePos types.TPoint,
 		return
 	}
 
+	ndata := (*navData)(curItem.Data())
+
 	mnu := vcl.NewPopupMenu(f.Buckets)
+	mnu.SetImages(f.ImageList)
 
 	mnuRefresh := vcl.NewMenuItem(mnu)
 	mnuRefresh.SetCaption("Refresh")
-	mnuRefresh.SetOnClick(f.OnNavContextRefresh)
+	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.
@@ -349,6 +530,7 @@ func (f *TMainForm) OnNavContextPopup(sender vcl.IObject, mousePos types.TPoint,
 		mnuClose := vcl.NewMenuItem(mnu)
 		mnuClose.SetCaption("Close")
 		mnuClose.SetOnClick(f.OnNavContextClose)
+		mnuClose.SetImageIndex(imgDatabaseDelete)
 		mnu.Items().Add(mnuClose)
 	}
 
@@ -356,9 +538,157 @@ func (f *TMainForm) OnNavContextPopup(sender vcl.IObject, mousePos types.TPoint,
 	mnu.Popup2()
 }
 
-func (f *TMainForm) OnNavContextRefresh(sender vcl.IObject) {
+func (f *TMainForm) RefreshCurrentItem() {
-	vcl.ShowMessage("TODO")
+	item := f.Buckets.Selected()
-	// TODO
+	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) {
@@ -378,6 +708,46 @@ func (f *TMainForm) OnNavContextClose(sender vcl.IObject) {
 	// 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 {
@@ -390,6 +760,10 @@ func (f *TMainForm) OnQueryExecute(sender vcl.IObject) {
 		queryString = f.queryInput.SelText() // Just the selected text
 	}
 
+	if strings.TrimSpace(queryString) == "" {
+		return // prevent blank query
+	}
+
 	// Execute
 	node := f.Buckets.Selected()
 	if node == nil {
@@ -398,7 +772,18 @@ func (f *TMainForm) OnQueryExecute(sender vcl.IObject) {
 	}
 
 	ndata := (*navData)(node.Data())
-	ndata.ld.ExecQuery(queryString, 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) {
@@ -411,7 +796,33 @@ func (f *TMainForm) OnNavChange(sender vcl.IObject, node *vcl.TTreeNode) {
 		ld = ndata.ld
 	}
 
-	ld.RenderForNav(f, ndata) // Handover to the database type's own renderer function
+	// 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)
+
+	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(ld.DisplayName() + " | " + ld.DriverName())
@@ -429,6 +840,15 @@ func (f *TMainForm) OnNavExpanding(sender vcl.IObject, node *vcl.TTreeNode, allo
 
 	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

redisConnectionDialog.go

@@ -26,9 +26,9 @@ type TRedisConnectionDialog struct {
 func (f *TRedisConnectionDialog) OnFormCreate(sender vcl.IObject) {
 
 	f.SetCaption("Connect to Redis...")
-	f.ScreenCenter()
 	f.SetWidth(320)
 	f.SetHeight(160)
+	f.SetPosition(types.PoOwnerFormCenter)
 
 	// row 1
 

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

@@ -8,4 +8,14 @@ func box_interface[T any](input []T) []interface{} {
 		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

@@ -1,14 +1,19 @@
 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.
@@ -25,3 +30,94 @@ func vcl_row(owner vcl.IWinControl, top int32) *vcl.TPanel {
 
 	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
+		}
+	}
+}