diff -r 4cf418c2a013 -r ffb0665028f0 contrib/mercurial.el
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/contrib/mercurial.el	Fri Aug 19 16:43:30 2005 -0800
@@ -0,0 +1,590 @@
+;;; mercurial.el --- Emacs support for the Mercurial distributed SCM
+
+;; Copyright (C) 2005 Bryan O'Sullivan
+
+;; Author: Bryan O'Sullivan <bos@serpentine.com>
+
+;; $Id$
+
+;; mercurial.el is free software; you can redistribute it and/or
+;; modify it under the terms of version 2 of the GNU General Public
+;; License as published by the Free Software Foundation.
+
+;; mercurial.el 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 mercurial.el, GNU Emacs, or XEmacs; see the file COPYING
+;; (`C-h C-l').  If not, write to the Free Software Foundation, Inc.,
+;; 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; This mode builds upon Emacs's VC mode to provide flexible
+;; integration with the Mercurial distributed SCM tool.
+
+;; To get going as quickly as possible, load mercurial.el into Emacs and
+;; type `C-c h h'; this runs hg-help-overview, which prints a helpful
+;; usage overview.
+
+;; Much of the inspiration for mercurial.el comes from Rajesh
+;; Vaidheeswarran's excellent p4.el, which does an admirably thorough
+;; job for the commercial Perforce SCM product.  In fact, substantial
+;; chunks of code are adapted from p4.el.
+
+;; This code has been developed under XEmacs 21.5, and may will not
+;; work as well under GNU Emacs (albeit tested under 21.2).  Patches
+;; to enhance the portability of this code, fix bugs, and add features
+;; are most welcome.  You can clone a Mercurial repository for this
+;; package from http://www.serpentine.com/hg/hg-emacs
+
+;; Please send problem reports and suggestions to bos@serpentine.com.
+
+
+;;; Code:
+
+(require 'advice)
+(require 'cl)
+(require 'diff-mode)
+(require 'easymenu)
+(require 'vc)
+
+
+;;; XEmacs has view-less, while GNU Emacs has view.  Joy.
+
+(condition-case nil
+    (require 'view-less)
+  (error nil))
+(condition-case nil
+    (require 'view)
+  (error nil))
+
+
+;;; Variables accessible through the custom system.
+
+(defgroup mercurial nil
+  "Mercurial distributed SCM."
+  :group 'tools)
+
+(defcustom hg-binary
+  (dolist (path '("~/bin/hg"
+		  "/usr/bin/hg"
+		  "/usr/local/bin/hg"))
+    (when (file-executable-p path)
+      (return path)))
+  "The path to Mercurial's hg executable."
+  :type '(file :must-match t)
+  :group 'mercurial)
+
+(defcustom hg-mode-hook nil
+  "Hook run when a buffer enters hg-mode."
+  :type 'sexp
+  :group 'mercurial)
+
+(defcustom hg-global-prefix "\C-ch"
+  "The global prefix for Mercurial keymap bindings."
+  :type 'sexp
+  :group 'mercurial)
+
+(defcustom hg-rev-completion-limit 100
+  "The maximum number of revisions that hg-read-rev will offer to complete.
+This affects memory usage and performance when prompting for revisions
+in a repository with a lot of history."
+  :type 'integer
+  :group 'mercurial)
+
+(defcustom hg-log-limit 50
+  "The maximum number of revisions that hg-log will display."
+  :type 'integer
+  :group 'mercurial)
+
+
+;;; Other variables.
+
+(defconst hg-running-xemacs (string-match "XEmacs" emacs-version)
+  "Is mercurial.el running under XEmacs?")
+
+(defvar hg-mode nil
+  "Is this file managed by Mercurial?")
+(make-variable-buffer-local 'hg-mode)
+(put 'hg-mode 'permanent-local t)
+
+(defvar hg-status nil)
+(make-variable-buffer-local 'hg-status)
+(put 'hg-status 'permanent-local t)
+
+(defvar hg-output-buffer-name "*Hg*"
+  "The name to use for Mercurial output buffers.")
+
+(defvar hg-file-history nil)
+(defvar hg-rev-history nil)
+
+
+;;; hg-mode keymap.
+
+(defvar hg-prefix-map
+  (let ((map (copy-keymap vc-prefix-map)))
+    (set-keymap-name map 'hg-prefix-map)
+    map)
+  "This keymap overrides some default vc-mode bindings.")
+(fset 'hg-prefix-map hg-prefix-map)
+(define-key hg-prefix-map "=" 'hg-diff)
+(define-key hg-prefix-map "c" 'hg-undo)
+(define-key hg-prefix-map "g" 'hg-annotate)
+(define-key hg-prefix-map "l" 'hg-log)
+(define-key hg-prefix-map "n" 'hg-commit-file)
+;; (define-key hg-prefix-map "r" 'hg-update)
+(define-key hg-prefix-map "u" 'hg-revert-file)
+(define-key hg-prefix-map "~" 'hg-version-other-window)
+
+(defvar hg-mode-map (make-sparse-keymap))
+(define-key hg-mode-map "\C-xv" 'hg-prefix-map)
+
+(add-minor-mode 'hg-mode 'hg-mode hg-mode-map)
+
+
+;;; Global keymap.
+
+(global-set-key "\C-xvi" 'hg-add)
+
+(defvar hg-global-map (make-sparse-keymap))
+(fset 'hg-global-map hg-global-map)
+(global-set-key hg-global-prefix 'hg-global-map)
+(define-key hg-global-map "," 'hg-incoming)
+(define-key hg-global-map "." 'hg-outgoing)
+(define-key hg-global-map "<" 'hg-pull)
+(define-key hg-global-map "=" 'hg-diff)
+(define-key hg-global-map ">" 'hg-push)
+(define-key hg-global-map "?" 'hg-help-overview)
+(define-key hg-global-map "A" 'hg-addremove)
+(define-key hg-global-map "U" 'hg-revert)
+(define-key hg-global-map "a" 'hg-add)
+(define-key hg-global-map "c" 'hg-commit)
+(define-key hg-global-map "f" 'hg-forget)
+(define-key hg-global-map "h" 'hg-help-overview)
+(define-key hg-global-map "i" 'hg-init)
+(define-key hg-global-map "l" 'hg-log)
+(define-key hg-global-map "r" 'hg-root)
+(define-key hg-global-map "s" 'hg-status)
+(define-key hg-global-map "u" 'hg-update)
+
+
+;;; View mode keymap.
+
+(defvar hg-view-mode-map
+  (let ((map (copy-keymap (if (boundp 'view-minor-mode-map)
+			      view-minor-mode-map
+			    view-mode-map))))
+    (set-keymap-name map 'hg-view-mode-map)
+    map))
+(fset 'hg-view-mode-map hg-view-mode-map)
+(define-key hg-view-mode-map
+  (if hg-running-xemacs [button2] [mouse-2])
+  'hg-buffer-mouse-clicked)
+
+
+;;; Convenience functions.
+
+(defun hg-binary ()
+  (if hg-binary
+      hg-binary
+    (error "No `hg' executable found!")))
+
+(defun hg-replace-in-string (str regexp newtext &optional literal)
+  "Replace all matches in STR for REGEXP with NEWTEXT string.
+Return the new string.  Optional LITERAL non-nil means do a literal
+replacement.
+
+This function bridges yet another pointless impedance gap between
+XEmacs and GNU Emacs."
+  (if (fboundp 'replace-in-string)
+      (replace-in-string str regexp newtext literal)
+    (replace-regexp-in-string regexp newtext str nil literal)))
+
+(defun hg-chomp (str)
+  "Strip trailing newlines from a string."
+  (hg-replace-in-string str "[\r\n]+$" ""))
+
+(defun hg-run-command (command &rest args)
+  "Run the shell command COMMAND, returning (EXIT-CODE . COMMAND-OUTPUT).
+The list ARGS contains a list of arguments to pass to the command."
+  (let* (exit-code
+	 (output
+	  (with-output-to-string
+	    (with-current-buffer
+		standard-output
+	      (setq exit-code
+		    (apply 'call-process command nil t nil args))))))
+    (cons exit-code output)))
+
+(defun hg-run (command &rest args)
+  "Run the Mercurial command COMMAND, returning (EXIT-CODE . COMMAND-OUTPUT)."
+  (apply 'hg-run-command (hg-binary) command args))
+
+(defun hg-run0 (command &rest args)
+  "Run the Mercurial command COMMAND, returning its output.
+If the command does not exit with a zero status code, raise an error."
+  (let ((res (apply 'hg-run-command (hg-binary) command args)))
+    (if (not (eq (car res) 0))
+	(error "Mercurial command failed %s - exit code %s"
+	       (cons command args)
+	       (car res))
+      (cdr res))))
+
+(defun hg-buffer-commands (pnt)
+  "Use the properties of a character to do something sensible."
+  (interactive "d")
+  (let ((rev (get-char-property pnt 'rev))
+	(file (get-char-property pnt 'file))
+	(date (get-char-property pnt 'date))
+	(user (get-char-property pnt 'user))
+	(host (get-char-property pnt 'host))
+	(prev-buf (current-buffer)))
+    (cond
+     (file
+      (find-file-other-window file))
+     (rev
+      (hg-diff hg-view-file-name rev rev prev-buf))
+     ((message "I don't know how to do that yet")))))
+
+(defun hg-buffer-mouse-clicked (event)
+  "Translate the mouse clicks in a HG log buffer to character events.
+These are then handed off to `hg-buffer-commands'.
+
+Handle frickin' frackin' gratuitous event-related incompatibilities."
+  (interactive "e")
+  (if hg-running-xemacs
+      (progn
+	(select-window (event-window event))
+	(hg-buffer-commands (event-point event)))
+    (select-window (posn-window (event-end event)))
+    (hg-buffer-commands (posn-point (event-start event)))))
+
+(unless (fboundp 'view-minor-mode)
+  (defun view-minor-mode (prev-buffer exit-func)
+    (view-mode)))
+
+(defun hg-abbrev-file-name (file)
+  (if hg-running-xemacs
+      (abbreviate-file-name file t)
+    (abbreviate-file-name file)))
+
+(defun hg-read-file-name (&optional prompt default)
+  "Read a file or directory name, or a pattern, to use with a command."
+  (let ((path (or default (buffer-file-name))))
+    (if (or (not path) current-prefix-arg)
+	(expand-file-name
+	 (read-file-name (format "File, directory or pattern%s: "
+				 (or prompt ""))
+			 (and path (file-name-directory path))
+			 nil nil
+			 (and path (file-name-nondirectory path))
+			 'hg-file-history))
+      path)))
+
+(defun hg-read-rev (&optional prompt default)
+  "Read a revision or tag, offering completions."
+  (let ((rev (or default "tip")))
+    (if (or (not rev) current-prefix-arg)
+	(let ((revs (split-string (hg-chomp
+				   (hg-run0 "-q" "log" "-r"
+					    (format "-%d"
+						    hg-rev-completion-limit)
+					    "-r" "tip"))
+				  "[\n:]")))
+	  (dolist (line (split-string (hg-chomp (hg-run0 "tags")) "\n"))
+	    (setq revs (cons (car (split-string line "\\s-")) revs)))
+	  (completing-read (format "Revision%s (%s): "
+				   (or prompt "")
+				   (or default "tip"))
+			   (map 'list 'cons revs revs)
+			   nil
+			   nil
+			   nil
+			   'hg-rev-history
+			   (or default "tip")))
+      rev)))
+
+;;; View mode bits.
+
+(defun hg-exit-view-mode (buf)
+  "Exit from hg-view-mode.
+We delete the current window if entering hg-view-mode split the
+current frame."
+  (when (and (eq buf (current-buffer))
+	     (> (length (window-list)) 1))
+    (delete-window))
+  (when (buffer-live-p buf)
+    (kill-buffer buf)))
+
+(defun hg-view-mode (prev-buffer &optional file-name)
+  (goto-char (point-min))
+  (set-buffer-modified-p nil)
+  (toggle-read-only t)
+  (view-minor-mode prev-buffer 'hg-exit-view-mode)
+  (use-local-map hg-view-mode-map)
+  (setq truncate-lines t)
+  (when file-name
+    (set (make-local-variable 'hg-view-file-name)
+	 (hg-abbrev-file-name file-name))))
+  
+(defun hg-file-status (file)
+  "Return status of FILE, or nil if FILE does not exist or is unmanaged."
+  (let* ((s (hg-run "status" file))
+	 (exit (car s))
+	 (output (cdr s)))
+    (if (= exit 0)
+	(let ((state (assoc (substring output 0 (min (length output) 2))
+			    '(("M " . modified)
+			      ("A " . added)
+			      ("R " . removed)))))
+	  (if state
+	      (cdr state)
+	    'normal)))))
+
+(defun hg-tip ()
+  (split-string (hg-chomp (hg-run0 "-q" "tip")) ":"))
+
+(defmacro hg-view-output (args &rest body)
+  "Execute BODY in a clean buffer, then quickly display that buffer.
+If the buffer contains one line, its contents are displayed in the
+minibuffer.  Otherwise, the buffer is displayed in view-mode.
+ARGS is of the form (BUFFER-NAME &optional FILE), where BUFFER-NAME is
+the name of the buffer to create, and FILE is the name of the file
+being viewed."
+  (let ((prev-buf (gensym "prev-buf-"))
+	(v-b-name (car args))
+	(v-m-rest (cdr args)))
+    `(let ((view-buf-name ,v-b-name)
+	   (,prev-buf (current-buffer)))
+       (get-buffer-create view-buf-name)
+       (kill-buffer view-buf-name)
+       (get-buffer-create view-buf-name)
+       (set-buffer view-buf-name)
+       (save-excursion
+	 ,@body)
+       (case (count-lines (point-min) (point-max))
+	 ((0)
+	  (kill-buffer view-buf-name)
+	  (message "(No output)"))
+	 ((1)
+	  (let ((msg (hg-chomp (buffer-substring (point-min) (point-max)))))
+	    (kill-buffer view-buf-name)
+	    (message "%s" msg)))
+	 (t
+	  (pop-to-buffer view-buf-name)
+	  (hg-view-mode ,prev-buf ,@v-m-rest))))))
+
+(put 'hg-view-output 'lisp-indent-function 1)
+
+;;; Hooks.
+
+(defun hg-mode-line ()
+  (when (hg-root)
+    (let ((status (hg-file-status buffer-file-name)))
+      (setq hg-status status
+	    hg-mode (and status (concat " Hg:"
+					(car (hg-tip))
+					(cdr (assq status
+						   '((normal . "")
+						     (removed . "r")
+						     (added . "a")
+						     (modified . "m")))))))
+      status)))
+
+(defun hg-find-file-hook ()
+  (when (hg-mode-line)
+    (run-hooks 'hg-mode-hook)))
+
+(add-hook 'find-file-hooks 'hg-find-file-hook)
+
+(defun hg-after-save-hook ()
+  (let ((old-status hg-status))
+    (hg-mode-line)
+    (if (and (not old-status) hg-status)
+	(run-hooks 'hg-mode-hook))))
+
+(add-hook 'after-save-hook 'hg-after-save-hook)
+
+
+;;; User interface functions.
+
+(defun hg-help-overview ()
+  "This is an overview of the Mercurial SCM mode for Emacs.
+
+You can find the source code, license (GPL v2), and credits for this
+code by typing `M-x find-library mercurial RET'.
+
+The Mercurial mode user interface is based on that of the older VC
+mode, so if you're already familiar with VC, the same keybindings and
+functions will generally work.
+
+Below is a list of common SCM tasks, with the key bindings needed to
+perform them, and the command names.  This list is not exhaustive.
+
+In the list below, `G/L' indicates whether a key binding is global (G)
+or local (L).  Global keybindings work on any file inside a Mercurial
+repository.  Local keybindings only apply to files under the control
+of Mercurial.  Many commands take a prefix argument.
+
+
+SCM Task                              G/L  Key Binding  Command Name
+--------                              ---  -----------  ------------
+Help overview (what you are reading)  G    C-c h h      hg-help-overview
+
+Tell Mercurial to manage a file       G    C-c h a      hg-add
+Commit changes to current file only   L    C-x v n      hg-commit
+Undo changes to file since commit     L    C-x v u      hg-revert-file
+
+Diff file vs last checkin             L    C-x v =      hg-diff
+
+View file change history              L    C-x v l      hg-log
+View annotated file                   L    C-x v a      hg-annotate
+
+Diff repo vs last checkin             G    C-c h =      hg-diff
+View status of files in repo          G    C-c h s      hg-status
+Commit all changes                    G    C-c h c      hg-commit
+
+Undo all changes since last commit    G    C-c h U      hg-revert
+View repo change history              G    C-c h l      hg-log
+
+See changes that can be pulled        G    C-c h ,      hg-incoming
+Pull changes                          G    C-c h <      hg-pull
+Update working directory after pull   G    C-c h u      hg-update
+See changes that can be pushed        G    C-c h .      hg-outgoing
+Push changes                          G    C-c h >      hg-push"
+  (interactive)
+  (hg-view-output ("Mercurial Help Overview")
+    (insert (documentation 'hg-help-overview))))
+
+(defun hg-add (path)
+  (interactive (list (hg-read-file-name " to add")))
+  (let ((buf (current-buffer))
+	(update (equal buffer-file-name path)))
+    (hg-view-output (hg-output-buffer-name)
+      (apply 'call-process (hg-binary) nil t nil (list "add" path)))
+    (when update
+      (with-current-buffer buf
+	(hg-mode-line)))))
+
+(defun hg-addremove ()
+  (interactive)
+  (error "not implemented"))
+
+(defun hg-annotate ()
+  (interactive)
+  (error "not implemented"))
+
+(defun hg-commit ()
+  (interactive)
+  (error "not implemented"))
+
+(defun hg-diff (path &optional rev1 rev2)
+  (interactive (list (hg-read-file-name " to diff")
+		     (hg-read-rev " to start with")
+		     (let ((rev2 (hg-read-rev " to end with" 'working-dir)))
+		       (and (not (eq rev2 'working-dir)) rev2))))
+  (let ((a-path (hg-abbrev-file-name path)))
+    (hg-view-output ((if (equal rev1 rev2)
+			 (format "Mercurial: Rev %s of %s" rev1 a-path)
+		       (format "Mercurial: Rev %s to %s of %s"
+			       rev1 (or rev2 "Current") a-path)))
+      (if rev2
+	  (call-process (hg-binary) nil t nil "diff" "-r" rev1 "-r" rev2 path)
+	(call-process (hg-binary) nil t nil "diff" "-r" rev1 path))
+      (diff-mode)
+      (font-lock-fontify-buffer))))
+
+(defun hg-forget (path)
+  (interactive (list (hg-read-file-name " to forget")))
+  (let ((buf (current-buffer))
+	(update (equal buffer-file-name path)))
+    (hg-view-output (hg-output-buffer-name)
+      (apply 'call-process (hg-binary) nil t nil (list "forget" path)))
+    (when update
+      (with-current-buffer buf
+	(hg-mode-line)))))
+  
+(defun hg-incoming ()
+  (interactive)
+  (error "not implemented"))
+
+(defun hg-init ()
+  (interactive)
+  (error "not implemented"))
+
+(defun hg-log (path &optional rev1 rev2)
+  (interactive (list (hg-read-file-name " to log")
+		     (hg-read-rev " to start with" "-1")
+		     (hg-read-rev " to end with" (format "-%d" hg-log-limit))))
+  (message "log %s %s" rev1 rev2)
+  (sit-for 1)
+  (let ((a-path (hg-abbrev-file-name path)))
+    (hg-view-output ((if (equal rev1 rev2)
+			 (format "Mercurial: Rev %s of %s" rev1 a-path)
+		       (format "Mercurial: Rev %s to %s of %s"
+			       rev1 (or rev2 "Current") a-path)))
+      (call-process (hg-binary) nil t nil "log" "-r" rev1 "-r" rev2 path)
+      (diff-mode)
+      (font-lock-fontify-buffer))))
+
+(defun hg-outgoing ()
+  (interactive)
+  (error "not implemented"))
+
+(defun hg-pull ()
+  (interactive)
+  (error "not implemented"))
+
+(defun hg-push ()
+  (interactive)
+  (error "not implemented"))
+
+(defun hg-revert ()
+  (interactive)
+  (error "not implemented"))
+
+(defun hg-revert-file ()
+  (interactive)
+  (error "not implemented"))
+
+(defun hg-root (&optional path)
+  (interactive (list (hg-read-file-name)))
+  (let ((root (do ((prev nil dir)
+		   (dir (file-name-directory (or path (buffer-file-name)))
+			(file-name-directory (directory-file-name dir))))
+		  ((equal prev dir))
+		(when (file-directory-p (concat dir ".hg"))
+		  (return dir)))))
+    (when (interactive-p)
+      (if root
+	  (message "The root of this repository is `%s'." root)
+	(message "The path `%s' is not in a Mercurial repository."
+		 (abbreviate-file-name path t))))
+    root))
+
+(defun hg-status (path)
+  (interactive (list (hg-read-file-name " for status" (hg-root))))
+  (let ((root (hg-root)))
+    (hg-view-output (hg-output-buffer-name)
+      (apply 'call-process (hg-binary) nil t nil
+	     (list "-C" root "status" path)))))
+
+(defun hg-undo ()
+  (interactive)
+  (error "not implemented"))
+
+(defun hg-version-other-window ()
+  (interactive)
+  (error "not implemented"))
+
+
+(provide 'mercurial)
+
+
+;;; Local Variables:
+;;; mode: emacs-lisp
+;;; prompt-to-byte-compile: nil
+;;; end: