use a seperate goroutine/channel for quit

app.go

@@ -9,8 +9,20 @@ import (
 )
 
 type App struct {
-	ui  *UI
-	nav *Nav
+	ui   *UI
+	nav  *Nav
+	quit chan bool
+}
+
+func newApp() *App {
+	ui := newUI()
+	nav := newNav(ui.wins[0].h)
+	quit := make(chan bool)
+	return &App{
+		ui:   ui,
+		nav:  nav,
+		quit: quit,
+	}
 }
 
 func waitKey() error {
@@ -39,9 +51,8 @@ func waitKey() error {
 
 func (app *App) handleInp() {
 	for {
-		// exit check is done on the top just in case user quits
-		// before input handling for some reason (e.g. in configuration file)
-		if gExitFlag {
+		select {
+		case <-app.quit:
 			log.Print("bye!")
 
 			if gLastDirPath != "" {
@@ -60,18 +71,16 @@ func (app *App) handleInp() {
 			}
 
 			return
+		default:
+			e, c := app.ui.getExpr(app.nav)
+			if e == nil {
+				continue
+			}
+			for i := 0; i < c; i++ {
+				e.eval(app, nil)
+			}
+			app.ui.draw(app.nav)
 		}
-		e, c := app.ui.getExpr(app.nav)
-		if e == nil {
-			continue
-		}
-		for i := 0; i < c; i++ {
-			e.eval(app, nil)
-		}
-		if gExitFlag {
-			continue
-		}
-		app.ui.draw(app.nav)
 	}
 }
 

client.go

@@ -25,9 +25,7 @@ func client() {
 	}
 	defer termbox.Close()
 
-	ui := newUI()
-	nav := newNav(ui.wins[0].h)
-	app := &App{ui, nav}
+	app := newApp()
 
 	app.ui.loadFile(app.nav)
 

eval.go

@@ -193,6 +193,7 @@ func (e *CallExpr) eval(app *App, args []string) {
 			out, err := os.Create(gSelectionPath)
 			if err != nil {
 				log.Printf("opening selection file: %s", err)
+				return
 			}
 			defer out.Close()
 
@@ -211,7 +212,8 @@ func (e *CallExpr) eval(app *App, args []string) {
 				log.Printf("writing selection file: %s", err)
 			}
 
-			gExitFlag = true
+			go func() { app.quit <- true }()
+
 			return
 		}
 
@@ -219,7 +221,7 @@ func (e *CallExpr) eval(app *App, args []string) {
 			cmd.eval(app, e.args)
 		}
 	case "quit":
-		gExitFlag = true
+		go func() { app.quit <- true }()
 	case "bot":
 		app.nav.bot()
 		app.ui.loadFile(app.nav)

main.go

@@ -20,7 +20,6 @@ var (
 )
 
 var (
-	gExitFlag      bool
 	gLastDirPath   string
 	gSelectionPath string
 	gSocketPath    string