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+;;; lselect.el --- Lucid interface to X Selections
+
+;; Copyright (C) 1990, 1993, 2001, 2002, 2003, 2004,
+;;   2005, 2006, 2007 Free Software Foundation, Inc.
+
+;; Maintainer: FSF
+;; Keywords: emulations
+
+;; This won't completely work until we support or emulate Lucid-style extents.
+;; Based on Lucid's selection code.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;;; Code:
+
+;; The selection code requires us to use certain symbols whose names are
+;; all upper-case; this may seem tasteless, but it makes there be a 1:1
+;; correspondence between these symbols and X Atoms (which are upcased.)
+
+;; This is Lucid/XEmacs stuff
+(defvar mouse-highlight-priority)
+(defvar x-lost-selection-functions)
+(defvar zmacs-regions)
+
+(defalias 'x-get-cutbuffer 'x-get-cut-buffer)
+(defalias 'x-store-cutbuffer 'x-set-cut-buffer)
+
+(or (facep 'primary-selection)
+    (make-face 'primary-selection))
+
+(or (facep 'secondary-selection)
+    (make-face 'secondary-selection))
+
+(defun x-get-secondary-selection ()
+  "Return text selected from some X window."
+  (x-get-selection-internal 'SECONDARY 'STRING))
+
+(defvar primary-selection-extent nil
+  "The extent of the primary selection; don't use this.")
+
+(defvar secondary-selection-extent nil
+  "The extent of the secondary selection; don't use this.")
+
+
+(defun x-select-make-extent-for-selection (selection previous-extent face)
+  ;; Given a selection, this makes an extent in the buffer which holds that
+  ;; selection, for highlighting purposes.  If the selection isn't associated
+  ;; with a buffer, this does nothing.
+  (let ((buffer nil)
+	(valid (and (extentp previous-extent)
+		    (extent-buffer previous-extent)
+		    (buffer-name (extent-buffer previous-extent))))
+	start end)
+    (cond ((stringp selection)
+	   ;; if we're selecting a string, lose the previous extent used
+	   ;; to highlight the selection.
+	   (setq valid nil))
+	  ((consp selection)
+	   (setq start (min (car selection) (cdr selection))
+		 end (max (car selection) (cdr selection))
+		 valid (and valid
+			    (eq (marker-buffer (car selection))
+				(extent-buffer previous-extent)))
+		 buffer (marker-buffer (car selection))))
+	  ((extentp selection)
+	   (setq start (extent-start-position selection)
+		 end (extent-end-position selection)
+		 valid (and valid
+			    (eq (extent-buffer selection)
+				(extent-buffer previous-extent)))
+		 buffer (extent-buffer selection)))
+	  )
+    (if (and (not valid)
+	     (extentp previous-extent)
+	     (extent-buffer previous-extent)
+	     (buffer-name (extent-buffer previous-extent)))
+	(delete-extent previous-extent))
+    (if (not buffer)
+	;; string case
+	nil
+      ;; normal case
+      (if valid
+	  (set-extent-endpoints previous-extent start end)
+	(setq previous-extent (make-extent start end buffer))
+	;; use same priority as mouse-highlighting so that conflicts between
+	;; the selection extent and a mouse-highlighted extent are resolved
+	;; by the usual size-and-endpoint-comparison method.
+	(set-extent-priority previous-extent mouse-highlight-priority)
+	(set-extent-face previous-extent face)))))
+
+
+(defun x-own-selection (selection &optional type)
+  "Make a primary X Selection of the given argument.
+The argument may be a string, a cons of two markers, or an extent.
+In the latter cases the selection is considered to be the text
+between the markers, or the between extents endpoints."
+  (interactive (if (not current-prefix-arg)
+		   (list (read-string "Store text for pasting: "))
+		 (list (cons ;; these need not be ordered.
+			(copy-marker (point-marker))
+			(copy-marker (mark-marker))))))
+  (or type (setq type 'PRIMARY))
+  (x-set-selection selection type)
+  (cond ((eq type 'PRIMARY)
+	 (setq primary-selection-extent
+	       (x-select-make-extent-for-selection
+		selection primary-selection-extent 'primary-selection)))
+	((eq type 'SECONDARY)
+	 (setq secondary-selection-extent
+	       (x-select-make-extent-for-selection
+		selection secondary-selection-extent 'secondary-selection))))
+  selection)
+
+
+(defun x-own-secondary-selection (selection &optional type)
+  "Make a secondary X Selection of the given argument.  The argument may be a
+string or a cons of two markers (in which case the selection is considered to
+be the text between those markers.)"
+  (interactive (if (not current-prefix-arg)
+		   (list (read-string "Store text for pasting: "))
+		 (list (cons ;; these need not be ordered.
+			(copy-marker (point-marker))
+			(copy-marker (mark-marker))))))
+  (x-own-selection selection 'SECONDARY))
+
+
+(defun x-own-clipboard (string)
+  "Paste the given string to the X Clipboard."
+  (x-own-selection string 'CLIPBOARD))
+
+
+(defun x-disown-selection (&optional secondary-p)
+  "Assuming we own the selection, disown it.  With an argument, discard the
+secondary selection instead of the primary selection."
+  (x-disown-selection-internal (if secondary-p 'SECONDARY 'PRIMARY)))
+
+(defun x-dehilight-selection (selection)
+  "for use as a value of `x-lost-selection-functions'."
+  (cond ((eq selection 'PRIMARY)
+	 (if primary-selection-extent
+	     (let ((inhibit-quit t))
+	       (delete-extent primary-selection-extent)
+	       (setq primary-selection-extent nil)))
+	 (if zmacs-regions (zmacs-deactivate-region)))
+	((eq selection 'SECONDARY)
+	 (if secondary-selection-extent
+	     (let ((inhibit-quit t))
+	       (delete-extent secondary-selection-extent)
+	       (setq secondary-selection-extent nil)))))
+  nil)
+
+(setq x-lost-selection-functions 'x-dehilight-selection)
+
+(defun x-notice-selection-requests (selection type successful)
+  "for possible use as the value of `x-sent-selection-functions'."
+  (if (not successful)
+      (message "Selection request failed to convert %s to %s"
+	       selection type)
+    (message "Sent selection %s as %s" selection type)))
+
+(defun x-notice-selection-failures (selection type successful)
+  "for possible use as the value of `x-sent-selection-functions'."
+  (or successful
+      (message "Selection request failed to convert %s to %s"
+	       selection type)))
+
+;(setq x-sent-selection-functions 'x-notice-selection-requests)
+;(setq x-sent-selection-functions 'x-notice-selection-failures)
+
+
+;; Random utility functions
+
+(defun x-kill-primary-selection ()
+  "If there is a selection, delete the text it covers, and copy it to
+both the kill ring and the Clipboard."
+  (interactive)
+  (or (x-selection-owner-p) (error "Emacs does not own the primary selection"))
+  (setq last-command nil)
+  (or primary-selection-extent
+      (error "the primary selection is not an extent?"))
+  (save-excursion
+    (set-buffer (extent-buffer primary-selection-extent))
+    (kill-region (extent-start-position primary-selection-extent)
+		 (extent-end-position primary-selection-extent)))
+  (x-disown-selection nil))
+
+(defun x-delete-primary-selection ()
+  "If there is a selection, delete the text it covers *without* copying it to
+the kill ring or the Clipboard."
+  (interactive)
+  (or (x-selection-owner-p) (error "Emacs does not own the primary selection"))
+  (setq last-command nil)
+  (or primary-selection-extent
+      (error "the primary selection is not an extent?"))
+  (save-excursion
+    (set-buffer (extent-buffer primary-selection-extent))
+    (delete-region (extent-start-position primary-selection-extent)
+		   (extent-end-position primary-selection-extent)))
+  (x-disown-selection nil))
+
+(defun x-copy-primary-selection ()
+  "If there is a selection, copy it to both the kill ring and the Clipboard."
+  (interactive)
+  (setq last-command nil)
+  (or (x-selection-owner-p) (error "Emacs does not own the primary selection"))
+  (or primary-selection-extent
+      (error "the primary selection is not an extent?"))
+  (save-excursion
+    (set-buffer (extent-buffer primary-selection-extent))
+    (copy-region-as-kill (extent-start-position primary-selection-extent)
+			 (extent-end-position primary-selection-extent))))
+
+(defun x-yank-clipboard-selection ()
+  "If someone owns a Clipboard selection, insert it at point."
+  (interactive)
+  (setq last-command nil)
+  (let ((clip (x-get-clipboard)))
+    (or clip (error "there is no clipboard selection"))
+    (push-mark)
+    (insert clip)))
+
+(provide 'lselect)
+
+
+;; Local variables:
+;; byte-compile-warnings: (not unresolved)
+;; End:
+
+;; arch-tag: 92fa54d4-c5d1-4e9b-ad58-cf1e13930556
+;;; lselect.el ends here