From 2c5f017cab8fd503521b813f9a540329c5656a15 Mon Sep 17 00:00:00 2001
From: Matthias Rustler <mrustler@gmx.de>
Date: Fri, 27 Dec 2024 11:45:13 +0100
Subject: [PATCH] enhance GUI to accept filename for file processing and
 display content

---
 cmd/iffmaster/main.go | 10 +++++-----
 internal/gui/gui.go   | 33 +++++++++++++++++++++++++++++++--
 2 files changed, 36 insertions(+), 7 deletions(-)

diff --git a/cmd/iffmaster/main.go b/cmd/iffmaster/main.go
index 36a47ce..f9bae97 100644
--- a/cmd/iffmaster/main.go
+++ b/cmd/iffmaster/main.go
@@ -21,6 +21,8 @@ import (
 )
 
 func main() {
+	var filename string
+
 	showVersion := flag.Bool("version", false, "Display the version of iffmaster")
 	flag.Parse()
 
@@ -30,10 +32,8 @@ func main() {
 	}
 
 	if flag.NArg() > 0 {
-		//filename := flag.Arg(0)
-		//fmt.Println("Filename provided:", filename)
-		// You can add code here to handle the filename, e.g., open the file
-	} else {
-		gui.OpenGUI(Version)
+		filename = flag.Arg(0)
 	}
+
+	gui.OpenGUI(filename, Version)
 }
diff --git a/internal/gui/gui.go b/internal/gui/gui.go
index 38f5176..e115491 100644
--- a/internal/gui/gui.go
+++ b/internal/gui/gui.go
@@ -7,6 +7,8 @@ package gui
 import (
 	"bytes"
 	"io"
+	"log"
+	"os"
 
 	"fyne.io/fyne/v2"
 	"fyne.io/fyne/v2/app"
@@ -36,8 +38,10 @@ type AppData struct {
 	structTableView *widget.Table
 }
 
-// OpenGUI layouts the main window and opens it
-func OpenGUI(version string) {
+// OpenGUI layouts the main window and opens it.
+// If a filename is given, it reads the file and displays its content.
+// The version string is used to display the version of the application.
+func OpenGUI(filename string, version string) {
 	var appData AppData
 	var fileDlg *dialog.FileDialog
 
@@ -110,5 +114,30 @@ func OpenGUI(version string) {
 	appData.win.SetContent(appData.topContainer)
 
 	appData.win.Resize(fyne.NewSize(800, 600))
+
+	readFileName(&appData, filename)
+
 	appData.win.ShowAndRun()
 }
+
+// readFileName reads the file with the given filename and displays its content.
+// If the filename is empty, it does nothing.
+func readFileName(appData *AppData, filename string) {
+	log.Print("readFileName: ", filename)
+	if filename != "" {
+		data, err := os.ReadFile(filename)
+		if err != nil {
+			dialog.ShowError(err, appData.win)
+			return
+		}
+
+		appData.chunks, err = chunks.ReadIFFFile(bytes.NewReader(data), int64(len(data)))
+		if err != nil {
+			dialog.ShowError(err, appData.win)
+			return
+		}
+
+		appData.nodeList = ConvertIFFChunkToListNode(appData.chunks)
+		appData.topContainer.Refresh()
+	}
+}