fs: add support for flag --no-console on windows to hide the console window

cmd/cmd.go

@@ -382,6 +382,11 @@ func initConfig() {
 	// Finish parsing any command line flags
 	configflags.SetFlags(ci)
 
+	// Hide console window
+	if ci.NoConsole {
+		terminal.HideConsole()
+	}
+
 	// Load filters
 	err := filterflags.Reload(ctx)
 	if err != nil {

fs/config.go

@@ -121,6 +121,7 @@ type ConfigInfo struct {
 	DownloadHeaders        []*HTTPOption
 	Headers                []*HTTPOption
 	RefreshTimes           bool
+	NoConsole              bool
 }
 
 // NewConfig creates a new config with everything set to the default

fs/config/configflags/configflags.go

@@ -124,6 +124,7 @@ func AddFlags(ci *fs.ConfigInfo, flagSet *pflag.FlagSet) {
 	flags.StringArrayVarP(flagSet, &downloadHeaders, "header-download", "", nil, "Set HTTP header for download transactions")
 	flags.StringArrayVarP(flagSet, &headers, "header", "", nil, "Set HTTP header for all transactions")
 	flags.BoolVarP(flagSet, &ci.RefreshTimes, "refresh-times", "", ci.RefreshTimes, "Refresh the modtime of remote files.")
+	flags.BoolVarP(flagSet, &ci.NoConsole, "no-console", "", ci.NoConsole, "Hide console window. Supported on Windows only.")
 }
 
 // ParseHeaders converts the strings passed in via the header flags into HTTPOptions

lib/terminal/hidden_other.go

@@ -0,0 +1,7 @@
+// +build !windows
+
+package terminal
+
+// HideConsole is only supported on windows
+func HideConsole() {
+}

lib/terminal/hidden_windows.go

@@ -0,0 +1,19 @@
+// +build windows
+
+package terminal
+
+import (
+	"syscall"
+)
+
+// HideConsole hides the console window and activates another window
+func HideConsole() {
+	getConsoleWindow := syscall.NewLazyDLL("kernel32.dll").NewProc("GetConsoleWindow")
+	showWindow := syscall.NewLazyDLL("user32.dll").NewProc("ShowWindow")
+	if getConsoleWindow.Find() == nil && showWindow.Find() == nil {
+		hwnd, _, _ := getConsoleWindow.Call()
+		if hwnd != 0 {
+			showWindow.Call(hwnd, 0)
+		}
+	}
+}