sqlite: add context actions for compact, export, drop table

db_sqlite.go

@@ -229,8 +229,52 @@ func (ld *sqliteLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
 	return nil, fmt.Errorf("unknown nav path %#v", ndata.bucketPath)
 }
 
-func (ld *sqliteLoadedDatabase) NavContext(ndata *navData) ([]contextAction, error) {
-	return nil, nil // No special actions are supported
+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() {

util_vcl.go

@@ -90,3 +90,30 @@ func vcl_stringgrid_columnwidths(d *vcl.TStringGrid) {
 		}
 	}
 }
+
+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
+}