Let the operator edit the station config in the window instead of hand-editing the file and relaunching.

Co-authored-by: Cursor <cursoragent@cursor.com>

app.go

@@ -5,17 +5,22 @@ import (
 	"fmt"
 	"io"
 
+	wailsruntime "github.com/wailsapp/wails/v2/pkg/runtime"
+
 	"gitea.neitzel.de/konrad/funknetz/audio"
 	"gitea.neitzel.de/konrad/funknetz/station"
 )
 
 // App is the window's view of the station.
 type App struct {
+	ctx     context.Context
 	cancel  context.CancelFunc
 	station *station.Station
+	quit    func(context.Context)
 }
 
 func (a *App) startup(ctx context.Context) {
+	a.ctx = ctx
 	runCtx, cancel := context.WithCancel(ctx)
 	a.cancel = cancel
 	if err := audio.Start(runCtx, a.station.WriteMicrophone, a.station.TakePlayback); err != nil {
@@ -46,6 +51,29 @@ func (a *App) HoldSpace() { a.station.HoldSpace() }
 // ReleaseSpace reports that Space was released.
 func (a *App) ReleaseSpace() { a.station.ReleaseSpace() }
 
+// Config returns the Config window form.
+func (a *App) Config() station.ConfigState { return a.station.Config() }
+
+// OpenConfig opens the Config window, re-reading the file.
+func (a *App) OpenConfig() { a.station.OpenConfig() }
+
+// Save validates and writes the config form.
+func (a *App) Save(form station.ConfigForm) error { return a.station.Save(form) }
+
+// CancelConfig discards the form. When no config has loaded, it quits.
+func (a *App) CancelConfig() {
+	if !a.station.Cancel() {
+		return
+	}
+	quit := a.quit
+	if quit == nil {
+		quit = wailsruntime.Quit
+	}
+	if a.ctx != nil {
+		quit(a.ctx)
+	}
+}
+
 func openStation(args []string) (*station.Station, error) {
 	path, err := resolveConfigPath(args)
 	if err != nil {
@@ -54,8 +82,9 @@ func openStation(args []string) (*station.Station, error) {
 	return station.New(station.Options{ConfigPath: path})
 }
 
-// openStationReported opens the station from args. A flag or config failure is
-// one line on stderr and the returned error. The window is not opened.
+// openStationReported opens the station from args. A flag or path failure is
+// one line on stderr and the returned error. A missing or invalid config still
+// returns a station so the window can open.
 func openStationReported(args []string, stderr io.Writer) (*station.Station, error) {
 	st, err := openStation(args)
 	if err != nil {