fit images to window; fix GetOpenFile parsing response

main.go

@@ -7,6 +7,8 @@ import (
 	"os"
 	"path/filepath"
 	"slices"
+	"strconv"
+	"strings"
 
 	"github.com/disintegration/imaging"
 	tk "modernc.org/tk9.0"
@@ -36,6 +38,13 @@ var directoryState struct {
 	images           []string
 }
 
+func must[T any](t T, err error) T {
+	if err != nil {
+		panic(err)
+	}
+	return t
+}
+
 func isImage(entry os.DirEntry) bool {
 	if entry.IsDir() {
 		return false
@@ -51,16 +60,17 @@ func isImage(entry os.DirEntry) bool {
 
 func newFileInDirectory(img *tk.LabelWidget) func() {
 	return func() {
-		files := tk.GetOpenFile(tk.Filetypes(validFileTypes))
+		files := tk.GetOpenFile(tk.Filetypes(validFileTypes), tk.Multiple(false))
 		if len(files) < 1 || files[0] == "" {
 			log.Println("no file chosen")
 			return
 		}
-		directoryState.currentFile = filepath.Base(files[0])
-		directoryState.currentDirectory = filepath.Dir(files[0])
+		file := strings.Join(files, " ") // GetOpenFile returns an array split on spaces!
+		directoryState.currentFile = filepath.Base(file)
+		directoryState.currentDirectory = filepath.Dir(file)
 		dirfiles, err := os.ReadDir(directoryState.currentDirectory)
 		if err != nil {
-			log.Println(err)
+			log.Printf("could not open dir: %v", err)
 			return
 		}
 		directoryState.images = []string{}
@@ -69,7 +79,7 @@ func newFileInDirectory(img *tk.LabelWidget) func() {
 				directoryState.images = append(directoryState.images, v.Name())
 			}
 		}
-		updateImage(files[0], img)
+		updateImage(file, img)
 	}
 }
 
@@ -99,22 +109,19 @@ func newDirectory(img *tk.LabelWidget) func() {
 func updateImage(file string, img *tk.LabelWidget) {
 	i, err := imaging.Open(file, imaging.AutoOrientation(true))
 	if err != nil {
-		log.Println(err.Error())
+		log.Printf("error opening image: %v", err)
 		return
 	}
-	// todo: make these bounds max out at display size
-	if i.Bounds().Dy() > i.Bounds().Dx() {
-		i = imaging.Resize(i, 0, 1000, imaging.CatmullRom)
-	} else {
-		i = imaging.Resize(i, 1000, 0, imaging.CatmullRom)
-	}
+	i = imaging.Fit(i,
+		must(strconv.Atoi(tk.WinfoScreenWidth(tk.App))),
+		must(strconv.Atoi(tk.WinfoScreenHeight(tk.App))),
+		imaging.Linear,
+	)
 	repaint(img, filepath.Base(file), tk.Data(i))
 	directoryState.currentFile = filepath.Base(file)
 }
 
 func repaint(img *tk.LabelWidget, name string, opt tk.Opt) {
-	photo := tk.NewPhoto(opt)
-	log.Printf("height: %v, width: %v", photo.Height(), photo.Width())
 	img.Configure(tk.Image(tk.NewPhoto(opt)))
 	if name != "" {
 		tk.App.WmTitle(fmt.Sprintf("why | %s", name))