fix: make create_scratch_buffer work correctly across splits

This is useful for recursive command calling to avoid overwriting the
global command arguments buffer.

src/command.zig

@@ -18,11 +18,20 @@ pub const Context = struct {
         cbor.writeValue(&context_buffer.writer, value) catch @panic("command.Context.fmt failed");
         return .{ .args = .{ .buf = context_buffer.written() } };
     }
+
+    fn fmtbuf(buf: []u8, value: anytype) error{CommandContextBufferNoSpaceLeft}!Context {
+        var writer: std.Io.Writer = .fixed(buf);
+        cbor.writeValue(&writer, value) catch |e| return switch (e) {
+            error.WriteFailed => error.CommandContextBufferNoSpaceLeft,
+        };
+        return .{ .args = .{ .buf = writer.buffered() } };
+    }
 };
 
 const context_buffer_allocator = std.heap.c_allocator;
 threadlocal var context_buffer: std.Io.Writer.Allocating = .init(context_buffer_allocator);
 pub const fmt = Context.fmt;
+pub const fmtbuf = Context.fmtbuf;
 
 const Vtable = struct {
     id: ID = ID_unknown,

src/tui/mainview.zig

@@ -724,6 +724,21 @@ const cmds = struct {
         const args = try ctx.args.clone(self.allocator);
         defer self.allocator.free(args.buf);
         tui.reset_drag_context();
+
+        var file_path: []const u8 = undefined;
+        if (ctx.args.match(.{ tp.extract(&file_path), tp.string, tp.string }) catch false or
+            ctx.args.match(.{ tp.extract(&file_path), tp.string }) catch false or
+            ctx.args.match(.{tp.extract(&file_path)}) catch false)
+        {
+            if (self.buffer_manager.get_buffer_for_file(file_path)) |_| {
+                var buf: [tp.max_message_size]u8 = undefined;
+                try command.executeName("navigate", try command.fmtbuf(&buf, .{ .file = file_path }));
+                tui.need_render(@src());
+                self.location_update_from_editor();
+                return;
+            }
+        }
+
         try self.create_editor();
         try command.executeName("open_scratch_buffer", .{ .args = args });
         tui.need_render(@src());

src/tui/tui.zig

@@ -1354,7 +1354,8 @@ const cmds = struct {
             defer buffer_name.deinit();
             buffer_name.writer.print("*{s}*", .{cmd}) catch {};
             call_add_task(task);
-            tp.self_pid().send(.{ "cmd", "create_scratch_buffer", .{ buffer_name.written(), "", "conf" } }) catch |e| self.logger.err("task", e);
+            var buf: [tp.max_message_size]u8 = undefined;
+            try command.executeName("create_scratch_buffer", try command.fmtbuf(&buf, .{ buffer_name.written(), "", "conf" }));
             tp.self_pid().send(.{ "cmd", "shell_execute_stream", .{cmd} }) catch |e| self.logger.err("task", e);
         } else {
             return self.enter_overlay_mode(@import("mode/overlay/task_palette.zig").Type);