basic directory walking

go.mod

@@ -2,7 +2,7 @@ module git.yetaga.in/alazyreader/why
 
 go 1.24.0
 
-require modernc.org/tk9.0 v0.62.0
+require modernc.org/tk9.0 v0.62.1-0.20250222163156-e78eb59c0674
 
 require (
 	github.com/adrg/xdg v0.5.3 // indirect

go.sum

@@ -111,5 +111,7 @@ modernc.org/tcl9.0 v0.15.25 h1:3xNx26D+vYmSY3K9FaNdPmlHd8Hcz39YGiqsBFCYx5c=
 modernc.org/tcl9.0 v0.15.25/go.mod h1:hCbqZz0GQRzN3Xnfn4dKpMCwvA9sfEb+Go++cw1cJ3A=
 modernc.org/tk9.0 v0.62.0 h1:V4lyYhCRSXZKn+txvjZCyUnWodAFVJRYFDpFuLldGlk=
 modernc.org/tk9.0 v0.62.0/go.mod h1:vzTmvDro5F7yCnusSheZrF8VXXOzmY9RxH2c5M3YFqc=
+modernc.org/tk9.0 v0.62.1-0.20250222163156-e78eb59c0674 h1:iIzjoNi8sZ4lw0zIjfNNX730AqytNGIRnE+bZgrWhTg=
+modernc.org/tk9.0 v0.62.1-0.20250222163156-e78eb59c0674/go.mod h1:vzTmvDro5F7yCnusSheZrF8VXXOzmY9RxH2c5M3YFqc=
 modernc.org/token v1.1.0 h1:Xl7Ap9dKaEs5kLoOQeQmPWevfnk/DM5qcLcYlA8ys6Y=
 modernc.org/token v1.1.0/go.mod h1:UGzOrNV1mAFSEB63lOFHIpNRUVMvYTc6yu1SMY/XTDM=

main.go

@@ -11,15 +11,17 @@ import (
 	"io"
 	"log"
 	"os"
+	"path/filepath"
 	"slices"
-	"strings"
 	"time"
 
 	tk "modernc.org/tk9.0"
 )
 
-//go:embed gopher.png
-var gopher []byte
+// this is a default image
+//
+//go:embed noise.png
+var noise []byte
 
 var validFileTypes = []tk.FileType{
 	{
@@ -40,14 +42,32 @@ var validFileTypes = []tk.FileType{
 	},
 }
 
-var metaPressed bool
+var metaActive bool
 
-func isType(filename string, desired string) bool {
-	splode := strings.Split(filename, ".")
-	if len(splode) < 2 {
+var directoryState struct {
+	currentDirectory string
+	currentFile      string
+	images           []string
+}
+
+func isImage(entry os.DirEntry) bool {
+	if entry.IsDir() {
+		return false
+	}
+	ext := filepath.Ext(entry.Name())
+	for _, ft := range validFileTypes {
+		if slices.Contains(ft.Extensions, ext) {
+			return true
+		}
+	}
+	return false
+}
+
+func isType(filename string, desired string) bool {
+	ext := filepath.Ext(filename)
+	if ext == "" {
 		return false
 	}
-	ext := fmt.Sprintf(".%s", splode[len(splode)-1])
 	for _, ft := range validFileTypes {
 		if slices.Contains(ft.Extensions, ext) && ft.TypeName == desired {
 			return true
@@ -79,59 +99,93 @@ func jpegToPng(in io.Reader) (*bytes.Buffer, error) {
 	return buf, nil
 }
 
-func loadImage(img *tk.LabelWidget) func() {
+func newDirectory(img *tk.LabelWidget) func() {
 	return func() {
 		files := tk.GetOpenFile(tk.Filetypes(validFileTypes))
 		if len(files) > 0 {
-			f, err := os.Open(files[0])
+			directoryState.currentFile = filepath.Base(files[0])
+			directoryState.currentDirectory = filepath.Dir(files[0])
+			dirfiles, err := os.ReadDir(directoryState.currentDirectory)
 			if err != nil {
-				log.Println(err.Error())
-				return
+				log.Println(err)
 			}
-			var r io.Reader
-			if isType(files[0], "JPEG") {
-				r, err = jpegToPng(f)
-				if err != nil {
-					log.Println(err.Error())
-					return
+			directoryState.images = []string{}
+			for _, v := range dirfiles {
+				if isImage(v) {
+					directoryState.images = append(directoryState.images, v.Name())
 				}
-			} else {
-				r = f
 			}
-			i, err := io.ReadAll(r)
-			if err != nil {
-				log.Println(err.Error())
-				return
-			}
-			img.Configure(tk.Image(tk.NewPhoto(tk.Data(i))))
+			updateImage(files[0], img)
 		}
 	}
 }
 
+func updateImage(file string, img *tk.LabelWidget) {
+	f, err := os.Open(file)
+	if err != nil {
+		log.Println(err.Error())
+		return
+	}
+	var r io.Reader
+	if isType(file, "JPEG") {
+		r, err = jpegToPng(f)
+		if err != nil {
+			log.Println(err.Error())
+			return
+		}
+	} else {
+		r = f
+	}
+	i, err := io.ReadAll(r)
+	if err != nil {
+		log.Println(err.Error())
+		return
+	}
+	img.Configure(tk.Image(tk.NewPhoto(tk.Data(i))))
+	directoryState.currentFile = filepath.Base(file)
+}
+
 func main() {
-	img := tk.Label(tk.Image(tk.NewPhoto(tk.Data(gopher))))
+	img := tk.Label(tk.Image(tk.NewPhoto(tk.Data(noise))))
 
 	menubar := tk.Menu()
 	fileMenu := menubar.Menu()
-	fileMenu.AddCommand(tk.Lbl("Open"), tk.Underline(0), tk.Accelerator("Meta+O"), tk.Command(loadImage(img)))
+	fileMenu.AddCommand(tk.Lbl("Open"), tk.Underline(0), tk.Accelerator("Meta+O"), tk.Command(newDirectory(img)))
 	menubar.AddCascade(tk.Lbl("File"), tk.Underline(0), tk.Mnu(fileMenu))
 
+	// TODO: if someone presses the Meta key again after the openfile dialog box closes,
+	// it triggers a _release_ event instead of a press event. The second time afterward, it works correctly.
 	tk.Bind(tk.App, "<KeyPress>", tk.Command(func(e *tk.Event) {
-		if e.Keysym == "Meta_L" || e.Keysym == "Meta_R" {
-			metaPressed = true
-		}
-		if e.Keysym == "o" && metaPressed {
-			loadImage(img)()
+		curr := slices.Index(directoryState.images, directoryState.currentFile)
+		switch e.Keysym {
+		case ".":
+			log.Printf("state: %+v", directoryState)
+		case "Meta_L", "Meta_R":
+			metaActive = true
+		case "o":
+			if metaActive {
+				newDirectory(img)()
+			}
+		case "Up":
+			if curr > 0 {
+				updateImage(filepath.Join(directoryState.currentDirectory, directoryState.images[curr-1]), img)
+			}
+		case "Down":
+			if curr < len(directoryState.images)-1 && curr != -1 {
+				updateImage(filepath.Join(directoryState.currentDirectory, directoryState.images[curr+1]), img)
+			}
 		}
 	}))
 	tk.Bind(tk.App, "<KeyRelease>", tk.Command(func(e *tk.Event) {
-		if e.Keysym == "Meta_L" || e.Keysym == "Meta_R" {
-			metaPressed = false
+		switch e.Keysym {
+		case "Meta_L", "Meta_R":
+			metaActive = false
 		}
 	}))
-	tk.Bind(tk.App, "<TouchpadScroll>", tk.Command(func(e *tk.Event) {
-		// TODO: this event doesn't contain deltas, which means I can't tell if I'm scrolling "in" or "out"
-	}))
+	// todo: resize image based on scroll events
+	// tk.Bind(tk.App, "<TouchpadScroll>", tk.Command(func(e *tk.Event) {
+	// 	log.Printf("%v, %v", int16(e.Delta>>16), int16(e.Delta&0xFFFF))
+	// }))
 
 	tk.Pack(img)
 	tk.App.Configure(tk.Mnu(menubar)).Center().Wait()