Start work on porting icat to Go

tools/cmd/icat/main.go

@@ -0,0 +1,113 @@
+// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package icat
+
+import (
+	"fmt"
+	"os"
+
+	"kitty/tools/cli"
+	"kitty/tools/tty"
+	"kitty/tools/tui/graphics"
+	"kitty/tools/tui/loop"
+	"kitty/tools/utils"
+)
+
+var _ = fmt.Print
+
+var opts *Options
+var lp *loop.Loop
+
+type transfer_mode int
+
+const (
+	unknown transfer_mode = iota
+	unsupported
+	supported
+)
+
+var transfer_by_file, transfer_by_memory, transfer_by_stream transfer_mode
+
+var temp_files_to_delete []string
+var direct_query_id, file_query_id, memory_query_id uint32
+var stderr_is_tty bool
+
+func print_error(format string, args ...any) {
+	if lp == nil || !stderr_is_tty {
+		fmt.Fprintf(os.Stderr, format, args...)
+		fmt.Fprintln(os.Stderr)
+	} else {
+		lp.QueueWriteString(fmt.Sprintf(format, args...))
+		lp.QueueWriteString("\r\n")
+	}
+}
+
+func on_initialize() (string, error) {
+	var iid uint32
+	g := func(t graphics.GRT_t, payload string) uint32 {
+		iid += 1
+		g1 := &graphics.GraphicsCommand{}
+		g1.SetTransmission(t).SetAction(graphics.GRT_action_query).SetImageId(iid).SetDataWidth(1).SetDataHeight(1).SetFormat(graphics.GRT_format_rgb)
+		g1.WriteWithPayloadToLoop(lp, utils.UnsafeStringToBytes(payload))
+		return iid
+	}
+	sz, err := lp.ScreenSize()
+	if err != nil {
+		return "", fmt.Errorf("Failed to query terminal for screen size with error: %w", err)
+	}
+	if sz.WidthPx == 0 || sz.HeightPx == 0 {
+		return "", fmt.Errorf("Terminal does not support reporting screen sizes via the TIOCGWINSZ ioctl")
+	}
+	direct_query_id = g(graphics.GRT_transmission_direct, "123")
+	tf, err := graphics.MakeTemp()
+	if err == nil {
+		file_query_id = g(graphics.GRT_transmission_tempfile, tf.Name())
+		temp_files_to_delete = append(temp_files_to_delete, tf.Name())
+		tf.Write([]byte{1, 2, 3})
+		tf.Close()
+	} else {
+		transfer_by_file = unsupported
+		print_error("Failed to create temporary file for data transfer, file based transfer is disabled. Error: %v", err)
+	}
+
+	return "", nil
+}
+
+func on_finalize() string {
+	if len(temp_files_to_delete) > 0 {
+		for _, name := range temp_files_to_delete {
+			os.Remove(name)
+		}
+	}
+	return ""
+}
+
+func main(cmd *cli.Command, o *Options, args []string) (rc int, err error) {
+	opts = o
+	stderr_is_tty = tty.IsTerminal(os.Stderr.Fd())
+	if opts.PrintWindowSize {
+		t, err := tty.OpenControllingTerm()
+		if err != nil {
+			return 1, fmt.Errorf("Failed to open controlling terminal with error: %w", err)
+		}
+		sz, err := t.GetSize()
+		if err != nil {
+			return 1, fmt.Errorf("Failed to query terminal using TIOCGWINSZ with error: %w", err)
+		}
+		fmt.Printf("%dx%d", sz.Xpixel, sz.Ypixel)
+		return 0, nil
+	}
+	temp_files_to_delete = make([]string, 0, 8)
+	lp, err = loop.New(loop.NoAlternateScreen, loop.NoRestoreColors, loop.NoMouseTracking)
+	if err != nil {
+		return
+	}
+	lp.OnInitialize = on_initialize
+	lp.OnFinalize = on_finalize
+
+	return 0, nil
+}
+
+func EntryPoint(parent *cli.Command) {
+	create_cmd(parent, main)
+}

tools/cmd/tool/main.go

@@ -9,6 +9,7 @@ import (
 	"kitty/tools/cmd/at"
 	"kitty/tools/cmd/clipboard"
 	"kitty/tools/cmd/edit_in_kitty"
+	"kitty/tools/cmd/icat"
 	"kitty/tools/cmd/update_self"
 	"kitty/tools/tui"
 )
@@ -26,6 +27,8 @@ func KittyToolEntryPoints(root *cli.Command) {
 	edit_in_kitty.EntryPoint(root)
 	// clipboard
 	clipboard.EntryPoint(root)
+	// icat
+	icat.EntryPoint(root)
 	// __hold_till_enter__
 	root.AddSubCommand(&cli.Command{
 		Name:            "__hold_till_enter__",