* vc-hg.el: New file.

etc/NEWS

@@ -71,6 +71,8 @@ considered for update.
 
 ** VC has some support for Bazaar (bzr).
 
+** VC has some support for Mercurial (hg).
+
 ** sgml-electric-tag-pair-mode lets you simultaneously edit matched tag pairs.
 
 

lisp/ChangeLog

@@ -1,3 +1,7 @@
+2007-06-19  Ivan Kanis <apple@kanis.eu>
+
+	* vc-hg.el: New file.
+
 2007-06-17  Glenn Morris  <rgm@gnu.org>
 
 	* lpr.el (lpr-page-header-switches): Move %s to separate element

lisp/vc-hg.el

@@ -0,0 +1,126 @@
+;;; vc-hg.el --- VC backend for the mercurial version control system
+
+;; Copyright (C) 2006  Ivan Kanis
+;; Author: Ivan Kanis
+;; $Id: vc-hg.el 1889 2007-06-17 12:39:26Z ivan $
+;;
+;; This program 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 2 of the License, or
+;; (at your option) any later version.
+;;
+;; This program 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 this program ; if not, write to the Free Software
+;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+;;; Commentary:
+
+;; This is a mercurial version control backend
+
+;;; THANKS:
+
+;;; BUGS:
+
+;;; INSTALLATION:
+
+;;; Code:
+
+(eval-when-compile
+  (require 'vc))
+
+;; (setq vc-handled-backends '(CVS SVN hg))
+
+;;; Customization options
+
+(defcustom vc-hg-global-switches nil
+  "*Global switches to pass to any Hg command."
+  :type '(choice (const :tag "None" nil)
+         (string :tag "Argument String")
+         (repeat :tag "Argument List"
+             :value ("")
+             string))
+  :version "22.1"
+  :group 'vc)
+
+;;; State querying functions
+
+(defun vc-hg-registered (file)
+  "Return t if FILE is registered in Hg"
+  (if (eq 0 (call-process "hg" nil nil nil
+                "--cwd" (file-name-directory file)
+                "status" (file-name-nondirectory file)))
+      (vc-file-setprop file 'vc-name file) nil))
+
+(defun vc-hg-state (file)
+  "Return state of files in Hg"
+  (let ((out (vc-hg-internal-status file)))
+    (if (eq 0 (length out)) 'up-to-date
+      (let ((state (aref out 0)))
+        (cond
+         ((eq state ?M) 'edited)
+         ((eq state ?P) 'needs-patch)
+         (t 'up-to-date))))))
+
+(defun vc-hg-workfile-version (file)
+  "Return version number of file"
+  (let ((out (vc-hg-internal-log file)))
+    (if (string-match "changeset: *\\([0-9]*\\)" out)
+        (match-string 1 out)
+      "0")))
+
+(defun vc-hg-internal-log(file)
+  "Return log of FILE"
+  (with-output-to-string
+    (with-current-buffer
+        standard-output
+      (call-process
+       "hg" nil t nil "--cwd" (file-name-directory file)
+       "log" "-l1" (file-name-nondirectory file)))))
+
+;;; History functions
+
+(defun vc-hg-print-log(file &optional buffer)
+  "Get change log associated with FILE."
+  (vc-hg-command
+   buffer
+   (if (and (vc-stay-local-p file) (fboundp 'start-process)) 'async 0)
+   file "log"))
+
+(defun vc-hg-internal-status(file)
+  "Return status of FILE"
+  (with-output-to-string
+    (with-current-buffer
+        standard-output
+      (call-process
+       "hg" nil t nil "--cwd" (file-name-directory file)
+       "status" (file-name-nondirectory file)))))
+
+(defun vc-hg-diff (file &optional oldvers newvers buffers)
+  "Get a difference report using hg between two versions of FILE."
+  (when buffers (message buffers))
+  (unless buffers (setq buffers "*vc-diff*"))
+  (when oldvers (message oldvers))
+  (when newvers (message newvers))
+  (call-process "hg" nil buffers nil
+                "--cwd" (file-name-directory file)
+                "diff" (file-name-nondirectory file)))
+
+;;; Internal functions
+
+(defun vc-hg-command (buffer okstatus file &rest flags)
+  "A wrapper around `vc-do-command' for use in vc-hg.el.
+The difference to vc-do-command is that this function always invokes `hg',
+and that it passes `vc-hg-global-switches' to it before FLAGS."
+  (apply 'vc-do-command buffer okstatus "hg" file
+         (if (stringp vc-hg-global-switches)
+             (cons vc-hg-global-switches flags)
+           (append vc-hg-global-switches
+                   flags))))
+
+(provide 'vc-hg)
+