[Emacs-diffs] Changes to emacs/lisp/term/xterm.el,v

[Dan Nicolaescu]

CVSROOT:        /cvsroot/emacs
Module name:    emacs
Changes by:     Dan Nicolaescu <dann>   07/07/16 04:05:10

Index: term/xterm.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/term/xterm.el,v
retrieving revision 1.39
retrieving revision 1.40
diff -u -b -r1.39 -r1.40
--- term/xterm.el       13 Jun 2007 18:48:08 -0000      1.39
+++ term/xterm.el       16 Jul 2007 04:04:08 -0000      1.40
@@ -400,7 +400,37 @@
     ;; Do it!
     (xterm-register-default-colors)
     ;; This recomputes all the default faces given the colors we've just set 
up.
-    (tty-set-up-initial-frame-faces)))
+    (tty-set-up-initial-frame-faces)
+
+    ;; Try to turn on the modifyOtherKeys feature on modern xterms.
+    ;; When it is turned on much more key bindings work: things like
+    ;; C-. C-, etc.
+    ;; To do that we need to find out if the current terminal supports
+    ;; modifyOtherKeys. At this time only xterm does.
+    (let ((coding-system-for-read 'binary)
+         (chr nil)
+         (str nil))
+      ;; Try to find out the type of terminal by sending a "Secondary
+      ;; Device Attributes (DA)" query.
+      (send-string-to-terminal "\e[>0c")
+
+      ;; The reply should be of the form: \e [ > NUMBER1 ; NUMBER2 ; NUMBER3 c
+      (when (equal (read-event nil nil 0.1) ?\e)
+       (when (equal (read-event nil nil 0.1) ?\[)
+         (while (not (equal (setq chr (read-event nil nil 0.1)) ?c))
+           (setq str (concat str (string chr))))
+         (when (string-match ">0;\\([0-9]+\\);0" str)
+           ;; NUMBER2 is the xterm version number, look for something
+           ;; greater than 216, the version when modifyOtherKeys was
+           ;; introduced.
+           (when (>= (string-to-number 
+                      (substring str (match-beginning 1) (match-end 1))) 216)
+             ;; Make sure that the modifyOtherKeys state is restored when
+             ;; suspending, resuming and exiting.
+             (add-hook 'suspend-hook 'xterm-turn-off-modify-other-keys)
+             (add-hook 'suspend-resume-hook 'xterm-turn-on-modify-other-keys)
+             (add-hook 'kill-emacs-hook 'xterm-turn-off-modify-other-keys)
+             (xterm-turn-on-modify-other-keys))))))))
 
 ;; Set up colors, for those versions of xterm that support it.
 (defvar xterm-standard-colors
@@ -518,5 +548,13 @@
     ;; right colors, so clear them.
     (clear-face-cache)))
 
+(defun xterm-turn-on-modify-other-keys ()
+  "Turn on the modifyOtherKeys feature of xterm."
+  (send-string-to-terminal "\e[>4;1m"))
+
+(defun xterm-turn-off-modify-other-keys ()
+  "Turn off the modifyOtherKeys feature of xterm."
+  (send-string-to-terminal "\e[>4m"))
+
 ;; arch-tag: 12e7ebdd-1e6c-4b25-b0f9-35ace25e855a
 ;;; xterm.el ends here