:zip: Experimental dryrun option

Author: yamnikov-oleg

main.go

@@ -26,23 +26,26 @@ var (
 
 	Version     string = "v0.1+"
 	ShowVersion bool
+
+	DryRun bool
 )
 
 func init() {
 	flag.BoolVar(&SingleInstance, SIFlag, false, "Run an instance of projektor, not a daemon")
 	flag.StringVar(&CPUProfile, "cpuprofile", "", "Run CPU profiling and output results to the `file`")
 	flag.BoolVar(&ShowVersion, "V", false, "Display version of current projektor build.\n\tPlus sign means that the build includes several more commits over the release.")
+	flag.BoolVar(&DryRun, "dry", false, "Prepare to run projektor instance but do not run (useful to force kernel caching).")
 }
 
-func RunInstance() {
+func RunInstance(dry bool) {
 	logf("Running single instance of projektor\n")
 
 	logf("Loading history...\n")
 	LoadHistory()
 	logf("Indexing desktop entries...\n")
 	IndexDesktopEntries()
 	logf("Set up the UI.\n")
-	SetupUi()
+	SetupUi(dry)
 }
 
 func RunDaemon() {
@@ -93,7 +96,7 @@ func main() {
 	}
 
 	if SingleInstance {
-		RunInstance()
+		RunInstance(DryRun)
 	} else {
 		RunDaemon()
 	}

ui.go

@@ -311,7 +311,7 @@ func init() {
 	runtime.LockOSThread()
 }
 
-func SetupUi() {
+func SetupUi(dry bool) {
 	logf("gtk.Init()\n")
 	gtk.Init(&os.Args)
 
@@ -422,8 +422,15 @@ func SetupUi() {
 	logf("UpdateSearchResults()\n")
 	UpdateSearchResults()
 
-	logf("ShowAll()\n")
-	Ui.Window.ShowAll()
+	if dry {
+		logf("Defer MainQuit()\n")
+		glib.IdleAdd(func() {
+			gtk.MainQuit()
+		})
+	} else {
+		logf("ShowAll()\n")
+		Ui.Window.ShowAll()
+	}
 
 	logf("gtk.Main()\n")
 	gtk.Main()