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;;; vc-hg.el --- VC backend for the mercurial version control system
;; Copyright (C) 2006, 2007 Free Software Foundation, Inc.
;; Author: Ivan Kanis
;; Keywords: tools
;; Version: 1889
;; 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 2, 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:
;; This is a mercurial version control backend
;;; Thanks:
;;; Bugs:
;;; Installation:
;;; Todo:
;; Implement the rest of the vc interface
;; Implement Stefan Monnier's advice:
;; vc-hg-registered and vc-hg-state
;; Both of those functions should be super extra careful to fail gracefully in
;; unexpected circumstances. The most important such case is when the `hg'
;; executable is not available. The reason this is important is that any error
;; there will prevent the user from even looking at the file :-(
;; Ideally, just like in vc-arch and vc-cvs, checking that the file is under
;; mercurial's control and extracting the current revision should be done
;; without even using `hg' (this way even if you don't have `hg' installed,
;; Emacs is able to tell you this file is under mercurial's control).
;;; History:
;;
;;; Code:
(eval-when-compile
(require 'vc))
;; XXX This should be moved to vc-hooks when the full vc interface is
;; implemented.
(add-to-list 'vc-handled-backends '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 "22.2"
:group 'vc)
;;; State querying functions
;;; Modelled after the similar function in vc-bzr.el
(defun vc-hg-registered (file)
"Return non-nil if FILE is registered with hg."
(if (vc-find-root file ".hg") ; short cut
(vc-hg-state file))) ; expensive
(defun vc-hg-state (file)
"Hg-specific version of `vc-state'."
(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 ?A) 'edited)
((eq state ?P) 'needs-patch)
((eq state ??) nil)
(t 'up-to-date))))))
(defun vc-hg-workfile-version (file)
"Hg-specific version of `vc-workfile-version'."
(let ((out (vc-hg-internal-log file)))
(if (string-match "changeset: *\\([0-9]*\\)" out)
(match-string 1 out)
"0")))
;;; 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-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)))
(defun vc-hg-register (file &optional rev comment)
"Register FILE under hg.
REV is ignored.
COMMENT is ignored."
(vc-hg-command nil nil file "add"))
;;; Modelled after the similar function in vc-bzr.el
(defun vc-hg-checkout (file &optional editable rev workfile)
"Retrieve a revision of FILE into a WORKFILE.
EDITABLE is ignored.
REV is the revision to check out into WORKFILE."
(unless workfile
(setq workfile (vc-version-backup-file-name file rev)))
(let ((coding-system-for-read 'binary)
(coding-system-for-write 'binary))
(with-temp-file workfile
(if rev
(vc-hg-command t nil file "cat" "-r" rev)
(vc-hg-command t nil file "cat")))))
(defun vc-hg-checkout-model (file)
'implicit)
;;; 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))))
(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)))))
(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)))))
(provide 'vc-hg)
;;; vc-hg.el ends here
|
