Support X clipboard managers.

* lisp/select.el (xselect-convert-to-targets): Add MULTIPLE target to list.
(xselect-convert-to-save-targets): New function.

* src/xselect.c: Support for clipboard managers.
(Vselection_alist): Move to termhooks.h as terminal-local var.
(LOCAL_SELECTION): New macro.
(x_atom_to_symbol): Handle x_display_info_for_display fail case.
(symbol_to_x_atom): Remove gratuitous arg.
(x_handle_selection_request, lisp_data_to_selection_data)
(x_get_foreign_selection, Fx_register_dnd_atom): Callers changed.
(x_own_selection, x_get_local_selection, x_convert_selection): New
arg, specifying work frame.  Use terminal-local Vselection_alist.
(some_frame_on_display): Delete unused function.
(Fx_own_selection_internal, Fx_get_selection_internal)
(Fx_disown_selection_internal, Fx_selection_owner_p)
(Fx_selection_exists_p): New optional frame arg.
(frame_for_x_selection, Fx_clipboard_manager_save): New functions.
(x_handle_selection_clear): Don't treat other terminals with the
same keyboard specially.  Use the terminal-local Vselection_alist.
(x_clear_frame_selections): Use Frun_hook_with_args.

* src/termhooks.h (Vselection_alist): Make it terminal-local.

* src/terminal.c (create_terminal): Initialize it.

* src/xterm.c (x_term_init): Intern ATOM and CLIPBOARD_MANAGER atoms.

* src/xterm.h: Add support for those atoms.

1 files changed, 14 insertions, 1 deletions

diff --git a/lisp/select.el b/lisp/select.el
index 1f5191e86c1..5abbf8f795d 100644
--- a/lisp/select.el
+++ b/lisp/select.el
@@ -289,7 +289,9 @@ two markers or an overlay.  Otherwise, it is nil."
 
 (defun xselect-convert-to-targets (_selection _type _value)
   ;; return a vector of atoms, but remove duplicates first.
-  (let* ((all (cons 'TIMESTAMP (mapcar 'car selection-converter-alist)))
+  (let* ((all (cons 'TIMESTAMP
+                    (cons 'MULTIPLE
+                          (mapcar 'car selection-converter-alist))))
          (rest all))
     (while rest
       (cond ((memq (car rest) (cdr rest))
@@ -365,6 +367,12 @@ This function returns the string \"emacs\"."
 (defun xselect-convert-to-identity (_selection _type value) ; used internally
   (vector value))
 
+;; Null target that tells clipboard managers we support SAVE_TARGETS
+;; (see freedesktop.org Clipboard Manager spec).
+(defun xselect-convert-to-save-targets (selection _type _value)
+  (when (eq selection 'CLIPBOARD)
+    'NULL))
+
 (setq selection-converter-alist
       '((TEXT . xselect-convert-to-string)
         (COMPOUND_TEXT . xselect-convert-to-string)
@@ -384,8 +392,13 @@ This function returns the string \"emacs\"."
         (NAME . xselect-convert-to-name)
         (ATOM . xselect-convert-to-atom)
         (INTEGER . xselect-convert-to-integer)
+        (SAVE_TARGETS . xselect-convert-to-save-targets)
         (_EMACS_INTERNAL . xselect-convert-to-identity)))
 
+(when (fboundp 'x-clipboard-manager-save)
+  (add-hook 'delete-frame-functions 'x-clipboard-manager-save)
+  (add-hook 'kill-emacs-hook 'x-clipboard-manager-save))
+
 (provide 'select)
 
 ;;; select.el ends here