add option to execute command on server initialization (#135)

app.go

@@ -136,6 +136,14 @@ func (app *app) loop() {
 	clientChan := app.ui.readExpr()
 	serverChan := readExpr()
 
+	if gCommand != "" {
+		p := newParser(strings.NewReader(gCommand))
+		if e := p.parseExpr(); e != nil {
+			log.Printf("evaluating start command: %s", e.String())
+			e.eval(app, nil)
+		}
+	}
+
 	for {
 		select {
 		case <-app.quitChan:

main.go

@@ -21,6 +21,7 @@ var (
 	gHostname      string
 	gLastDirPath   string
 	gSelectionPath string
+	gCommand       string
 	gSocketProt    string
 	gSocketPath    string
 	gLogPath       string
@@ -103,6 +104,11 @@ func main() {
 		"",
 		"path to the file to write selected files on open (to use as open file dialog)")
 
+	flag.StringVar(&gCommand,
+		"command",
+		"",
+		"command to execute on client initialization")
+
 	flag.Parse()
 
 	gSocketProt = gDefaultSocketProt