terminal/kitty-gfx: add debug function to dump image data

src/terminal/Terminal.zig

@@ -1566,10 +1566,9 @@ pub fn getPwd(self: *const Terminal) ?[]const u8 {
 pub fn kittyGraphics(
     self: *Terminal,
     alloc: Allocator,
-    buf: []u8,
     cmd: *kitty.graphics.Command,
 ) ?kitty.graphics.Response {
-    return kitty.graphics.execute(alloc, self, buf, cmd);
+    return kitty.graphics.execute(alloc, self, cmd);
 }
 
 /// Full reset

src/terminal/kitty/graphics_exec.zig

@@ -28,10 +28,8 @@ const log = std.log.scoped(.kitty_gfx);
 pub fn execute(
     alloc: Allocator,
     terminal: *Terminal,
-    buf: []u8,
     cmd: *Command,
 ) ?Response {
-    _ = buf;
     log.debug("executing kitty graphics command: {}", .{cmd.control});
 
     const resp_: ?Response = switch (cmd.control) {
@@ -246,6 +244,9 @@ fn loadAndAddImage(
         return img;
     }
 
+    // Dump the image data before it is decompressed
+    // img.debugDump() catch unreachable;
+
     // Validate and store our image
     try img.complete(alloc);
     try storage.addImage(alloc, img);

src/terminal/kitty/graphics_image.zig

@@ -1,4 +1,5 @@
 const std = @import("std");
+const builtin = @import("builtin");
 const assert = std.debug.assert;
 const Allocator = std.mem.Allocator;
 const ArenaAllocator = std.heap.ArenaAllocator;
@@ -73,6 +74,31 @@ pub const Image = struct {
         UnsupportedMedium,
     };
 
+    /// Debug function to write the data to a file. This is useful for
+    /// capturing some test data for unit tests.
+    pub fn debugDump(self: Image) !void {
+        if (comptime builtin.mode != .Debug) @compileError("debugDump in non-debug");
+
+        var buf: [1024]u8 = undefined;
+        const filename = try std.fmt.bufPrint(
+            &buf,
+            "image-{s}-{s}-{d}x{d}-{}.data",
+            .{
+                @tagName(self.format),
+                @tagName(self.compression),
+                self.width,
+                self.height,
+                self.id,
+            },
+        );
+        const cwd = std.fs.cwd();
+        const f = try cwd.createFile(filename, .{});
+        defer f.close();
+
+        const writer = f.writer();
+        try writer.writeAll(self.data);
+    }
+
     /// The length of the data in bytes, uncompressed. While this will
     /// decompress compressed data to count the bytes it doesn't actually
     /// store the decompressed data so this doesn't allocate much.

src/termio/Exec.zig

@@ -1087,8 +1087,7 @@ const StreamHandler = struct {
         // log.warn("APC command: {}", .{cmd});
         switch (cmd) {
             .kitty => |*kitty_cmd| {
-                var partial_buf: [512]u8 = undefined;
-                if (self.terminal.kittyGraphics(self.alloc, &partial_buf, kitty_cmd)) |resp| {
+                if (self.terminal.kittyGraphics(self.alloc, kitty_cmd)) |resp| {
                     var buf: [1024]u8 = undefined;
                     var buf_stream = std.io.fixedBufferStream(&buf);
                     try resp.encode(buf_stream.writer());