yvbolt/db_debconf.go

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2024-06-30 02:14:41 +00:00
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) {
// 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)
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}
for _, entry := range ld.db.Entries {
rpos := f.contentBox.RowCount()
f.contentBox.SetRowCount(rpos + 1)
f.contentBox.SetCells(0, rpos, entry.Name)
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for _, proppair := range entry.Properties {
f.contentBox.SetCells(int32(indexes[proppair[0]]), rpos, proppair[1])
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}
}
// Valid
vcl_stringgrid_columnwidths(f.contentBox)
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f.contentBox.SetEnabled(true)
}
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) ExecQuery(query string, resultArea *vcl.TStringGrid) {
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vcl.ShowMessage("debconf doesn't support querying")
}
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)
}