From 26ec1dfbe8643aa59b30f2110fbcaf9ed20435ca Mon Sep 17 00:00:00 2001
From: Hermes Agent <hermes@gharbeia.net>
Date: Tue, 12 May 2026 13:49:23 +0000
Subject: [PATCH] fix: backend-size (TIOCGWINSZ), kitty keyboard enable,
 Wayland clipboard, SIGWINCH handler

---
 backend/modern.lisp               | 17 ++++++++++++++---
 src/components/input-package.lisp |  2 ++
 src/components/input.lisp         | 14 ++++++++++++++
 src/components/mouse.lisp         |  9 +++++++--
 4 files changed, 37 insertions(+), 5 deletions(-)

diff --git a/backend/modern.lisp b/backend/modern.lisp
index 23c620a..1cf7bc1 100644
--- a/backend/modern.lisp
+++ b/backend/modern.lisp
@@ -140,18 +140,20 @@ as a fallback when a keyword is not in *named-colors*.")
   (make-instance 'modern-backend :output-stream (or output-stream *standard-output*)))
 
 (defmethod initialize-backend ((b modern-backend))
-  ;; Enter raw mode, enable mouse, bracketed paste
+  ;; Enter raw mode, enable mouse, bracketed paste, kitty keyboard
   (backend-write b (format nil "~C[?1049h" #\Esc))  ; alt screen
   (backend-write b (format nil "~C[?1000h" #\Esc))  ; mouse basic
   (backend-write b (format nil "~C[?1002h" #\Esc))  ; mouse drag
   (backend-write b (format nil "~C[?1006h" #\Esc))  ; SGR mouse
   (backend-write b (format nil "~C[?2004h" #\Esc))  ; bracketed paste
+  (backend-write b (format nil "~C[?u" #\Esc))      ; kitty keyboard
   (cursor-hide b)
   (finish-output (backend-output-stream b))
   b)
 
 (defmethod shutdown-backend ((b modern-backend))
   (cursor-show b)
+  (backend-write b (format nil "~C[?u" #\Esc))      ; restore default keyboard
   (backend-write b (format nil "~C[?2004l" #\Esc))  ; disable bracketed paste
   (backend-write b (format nil "~C[?1006l" #\Esc))  ; disable SGR mouse
   (backend-write b (format nil "~C[?1002l" #\Esc))
@@ -161,8 +163,17 @@ as a fallback when a keyword is not in *named-colors*.")
   (values))
 
 (defmethod backend-size ((b modern-backend))
-  ;; Default fallback — real implementation queries terminal
-  (values 80 24))
+  ;; Query actual terminal dimensions via TIOCGWINSZ ioctl
+  (let* ((+tiocgwinsz+ 21523)  ; 0x5413 on Linux
+         (winsize (sb-alien:make-alien sb-alien:unsigned-short 4)))
+    (unwind-protect
+         (progn
+           (sb-unix:unix-ioctl (sb-sys:fd-stream-fd (backend-output-stream b))
+                               +tiocgwinsz+
+                               winsize)
+           (values (sb-alien:deref winsize 1)  ;; cols
+                   (sb-alien:deref winsize 0))) ;; rows
+      (sb-alien:free-alien winsize))))
 
 (defmethod backend-write ((b modern-backend) string)
   (let ((stream (backend-output-stream b)))
diff --git a/src/components/input-package.lisp b/src/components/input-package.lisp
index 852926d..5d5224f 100644
--- a/src/components/input-package.lisp
+++ b/src/components/input-package.lisp
@@ -15,6 +15,8 @@
    #:with-raw-terminal
    ;; Event reading
    #:read-event
+   ;; Terminal resize flag
+   #:*terminal-resized-p*
    ;; TextInput
    #:text-input #:make-text-input
    #:text-input-value #:text-input-cursor
diff --git a/src/components/input.lisp b/src/components/input.lisp
index 5158dd9..029706b 100644
--- a/src/components/input.lisp
+++ b/src/components/input.lisp
@@ -318,6 +318,20 @@ key event rather than blocking indefinitely."
       (t
        (make-key-event :key :unknown :code b :raw (string (code-char b)))))))
 
+;;; ---------------------------------------------------------------------------
+;;; SIGWINCH handler for terminal resize
+;;; ---------------------------------------------------------------------------
+(defvar *terminal-resized-p* nil
+  "Set to T by SIGWINCH handler when terminal is resized.
+Applications should check and clear this flag each frame.")
+
+#+sbcl
+(eval-when (:load-toplevel :execute)
+  (sb-sys:enable-interrupt sb-posix:sigwinch
+    (lambda (signal info context)
+      (declare (ignore signal info context))
+      (setf *terminal-resized-p* t))))
+
 ;;; ---------------------------------------------------------------------------
 ;;; Backend integration
 ;;; ---------------------------------------------------------------------------
diff --git a/src/components/mouse.lisp b/src/components/mouse.lisp
index db68be7..facd028 100644
--- a/src/components/mouse.lisp
+++ b/src/components/mouse.lisp
@@ -49,8 +49,13 @@ Components without a layout-node or position return nil."
   (when *selection* (sel-text *selection*)))
 
 (defun copy-to-clipboard (text)
-  #+linux (sb-ext:run-program "xclip" (list "-selection" "clipboard")
-                               :input text :wait nil)
+  #+linux
+  (cond
+    ((sb-ext:posix-getenv "WAYLAND_DISPLAY")
+     (sb-ext:run-program "wl-copy" nil :input text :wait nil))
+    (t
+     (sb-ext:run-program "xclip" (list "-selection" "clipboard")
+                         :input text :wait nil)))
   #+darwin (sb-ext:run-program "pbcopy" nil :input text :wait nil))
 
 ;;; --- Selection tracking (mouse drag) ---------------------------------------