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emacs/lisp/vc-arch.el

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;;; vc-arch.el --- VC backend for the Arch version-control system
;; Copyright (C) 1995, 1998, 1999, 2000, 2001, 2002, 2003, 2004
;; Free Software Foundation, Inc.
;; Author: FSF (see vc.el for full credits)
;; Maintainer: Stefan Monnier <monnier@gnu.org>
;; 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., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; The home page of the Arch version control system is at
;;
;; http://www.gnuarch.org/
;;
;; This is derived from vc-mcvs.el as follows:
;; - cp vc-mcvs.el vc-arch.el and then M-% mcvs RET arch RET
;;
;; Then of course started the hacking.
;;
;; What has been partly tested:
;; - Open a file.
;; - C-x v = without any prefix arg.
;; - C-x v v to commit a change to a single file.
;; Bugs:
;; - *VC-log*'s initial content lacks the `Summary:' lines.
;; - All files under the tree are considered as "under Arch's control"
;; without regards to =tagging-method and such.
;; - Files are always considered as `edited'.
;; - C-x v l does not work.
;; - C-x v i does not work.
;; - C-x v ~ does not work.
;; - C-x v u does not work.
;; - C-x v s does not work.
;; - C-x v r does not work.
;; - VC-dired does not work.
;; - And more...
;;; Code:
(eval-when-compile (require 'vc) (require 'cl))
;;;
;;; Customization options
;;;
(defvar vc-arch-command
(let ((candidates '("tla")))
(while (and candidates (not (executable-find (car candidates))))
(setq candidates (cdr candidates)))
(or (car candidates) "tla")))
;; Clear up the cache to force vc-call to check again and discover
;; new functions when we reload this file.
(put 'Arch 'vc-functions nil)
;;;###autoload (defun vc-arch-registered (file)
;;;###autoload (if (vc-find-root file "{arch}/=tagging-method")
;;;###autoload (progn
;;;###autoload (load "vc-arch")
;;;###autoload (vc-arch-registered file))))
(defun vc-arch-add-tagline ()
"Add an `arch-tag' to the end of the current file."
(interactive)
(comment-normalize-vars)
(goto-char (point-max))
(forward-comment -1)
(unless (bolp) (insert "\n"))
(let ((beg (point))
(idfile (and buffer-file-name
(expand-file-name
(concat ".arch-ids/"
(file-name-nondirectory buffer-file-name)
".id")
(file-name-directory buffer-file-name)))))
(insert "arch-tag: ")
(if (and idfile (file-exists-p idfile))
;; If the file is unreadable, we do want to get an error here.
(progn
(insert-file-contents idfile)
(forward-line 1)
(delete-file idfile))
(condition-case nil
(call-process "uuidgen" nil t)
(file-error (insert (format "%s <%s> %s"
(current-time-string)
user-mail-address
(+ (nth 2 (current-time))
(buffer-size)))))))
(comment-region beg (point))))
(defconst vc-arch-tagline-re "^\\W*arch-tag:[ \t]*\\(.*[^ \t\n]\\)")
(defun vc-arch-file-source-p (file)
"Can return nil, `maybe' or a non-nil value.
Only the value `maybe' can be trusted :-(."
;; FIXME: Check the tag and name of parent dirs.
(unless (string-match "\\`[,+]" (file-name-nondirectory file))
(or (string-match "\\`{arch}/"
(file-relative-name file (vc-arch-root file)))
(file-exists-p
;; Check the presence of an ID file.
(expand-file-name
(concat ".arch-ids/" (file-name-nondirectory file) ".id")
(file-name-directory file)))
;; Check the presence of a tagline.
(with-current-buffer (find-file-noselect file)
(save-excursion
(goto-char (point-max))
(or (re-search-backward vc-arch-tagline-re (- (point) 1000) t)
(progn
(goto-char (point-min))
(re-search-forward vc-arch-tagline-re (+ (point) 1000) t)))))
;; FIXME: check =tagging-method to see whether untagged files might
;; be source or not.
(with-current-buffer
(find-file-noselect (expand-file-name "{arch}/=tagging-method"
(vc-arch-root file)))
(let ((untagged-source t)) ;Default is `names'.
(save-excursion
(goto-char (point-min))
(if (re-search-forward "^[ \t]*\\(\\(tagline\\|implicit\\|names\\)\\|explicit\\)" nil t)
(setq untagged-source (match-end 2)))
(if (re-search-forward "^[ \t]*untagged-source[ \t]+\\(\\(source\\)\\|precious\\|backup\\|junk\\|unrecognized\\)" nil t)
(setq untagged-source (match-end 2))))
(if untagged-source 'maybe))))))
(defun vc-arch-file-id (file)
;; Don't include the kind of ID this is because it seems to be too messy.
(let ((idfile (expand-file-name
(concat ".arch-ids/" (file-name-nondirectory file) ".id")
(file-name-directory file))))
(if (file-exists-p idfile)
(with-temp-buffer
(insert-file-contents idfile)
(looking-at ".*[^ \n\t]")
(match-string 0)))
(with-current-buffer (find-file-noselect file)
(save-excursion
(goto-char (point-max))
(if (or (re-search-backward vc-arch-tagline-re (- (point) 1000) t)
(progn
(goto-char (point-min))
(re-search-forward vc-arch-tagline-re (+ (point) 1000) t)))
(match-string 1)
(concat "./" (file-relative-name file (vc-arch-root file))))))))
(defun vc-arch-tagging-method (file)
(with-current-buffer
(find-file-noselect
(expand-file-name "{arch}/=tagging-method" (vc-arch-root file)))
(save-excursion
(goto-char (point-min))
(if (re-search-forward
"^[ \t]*\\(tagline\\|implicit\\|names\\|explicit\\)" nil t)
(intern (match-string 1))
'names))))
(defun vc-arch-root (file)
"Return the root directory of a Arch project, if any."
(or (vc-file-getprop file 'arch-root)
(vc-file-setprop
;; Check the =tagging-method, in case someone naively manually
;; creates a {arch} directory somewhere.
file 'arch-root (vc-find-root file "{arch}/=tagging-method"))))
(defun vc-arch-register (file &optional rev comment)
(if rev (error "Explicit initial revision not supported for Arch"))
(let ((tagmet (vc-arch-tagging-method file)))
(if (and (memq tagmet '(tagline implicit)) comment-start)
(with-current-buffer (find-file-noselect file)
(if (buffer-modified-p)
(error "Save %s first" (buffer-name)))
(vc-arch-add-tagline)
(save-buffer))
(vc-arch-command nil 0 file "add"))))
(defun vc-arch-registered (file)
;; Don't seriously check whether it's source or not. Checking would
;; require running TLA, so it's better to not do it, so it also works if
;; TLA is not installed.
(and (vc-arch-root file)
(vc-arch-file-source-p file)))
(defun vc-arch-default-version (file)
(or (vc-file-getprop (vc-arch-root file) 'arch-default-version)
(let* ((root (vc-arch-root file))
(f (expand-file-name "{arch}/++default-version" root)))
(if (file-readable-p f)
(vc-file-setprop
root 'arch-default-version
(with-temp-buffer
(insert-file-contents f)
;; Strip the terminating newline.
(buffer-substring (point-min) (1- (point-max)))))))))
(defun vc-arch-workfile-unchanged-p (file)
"Check if FILE is unchanged by diffing against the master version.
Return non-nil if FILE is unchanged."
nil)
(defun vc-arch-state (file)
;; There's no checkout operation and merging is not done from VC
;; so the only operation that's state dependent that VC supports is commit
;; which is only activated if the file is `edited'.
(let* ((root (vc-arch-root file))
(ver (vc-arch-default-version file))
(pat (concat "\\`" (subst-char-in-string ?/ ?% ver)))
(dir (expand-file-name ",,inode-sigs/"
(expand-file-name "{arch}" root)))
(sigfile nil))
(dolist (f (if (file-directory-p dir) (directory-files dir t pat)))
(if (or (not sigfile) (file-newer-than-file-p f sigfile))
(setq sigfile f)))
(if (not sigfile)
'edited ;We know nothing.
(let ((id (vc-arch-file-id file)))
(setq id (replace-regexp-in-string "[ \t]" "_" id))
(with-current-buffer (find-file-noselect sigfile)
(goto-char (point-min))
(while (and (search-forward id nil 'move)
(save-excursion
(goto-char (- (match-beginning 0) 2))
;; For `names', the lines start with `?./foo/bar'.
;; For others there's 2 chars before the ./foo/bar.
(or (not (or (bolp) (looking-at "\n?")))
;; Ignore E_ entries used for foo.id files.
(looking-at "E_")))))
(if (eobp)
;; ID not found.
(if (equal (file-name-nondirectory sigfile)
(subst-char-in-string
?/ ?% (vc-arch-workfile-version file)))
'added
;; Might be `added' or `up-to-date' as well.
;; FIXME: Check in the patch logs to find out.
'edited)
;; Found the ID, let's check the inode.
(if (not (re-search-forward
"\t.*mtime=\\([0-9]+\\):size=\\([0-9]+\\)"
(line-end-position) t))
;; Buh? Unexpected format.
'edited
(let ((ats (file-attributes file)))
(if (and (eq (nth 7 ats) (string-to-number (match-string 2)))
(equal (format-time-string "%s" (nth 5 ats))
(match-string 1)))
'up-to-date
'edited)))))))))
(defun vc-arch-workfile-version (file)
(let* ((root (expand-file-name "{arch}" (vc-arch-root file)))
(defbranch (vc-arch-default-version file)))
(when (and defbranch (string-match "\\`\\(.+@[^/\n]+\\)/\\(\\(\\(.*\\)--.*\\)--.*\\)\\'" defbranch))
(let* ((archive (match-string 1 defbranch))
(category (match-string 4 defbranch))
(branch (match-string 3 defbranch))
(version (match-string 2 defbranch))
(sealed nil) (rev-nb 0)
(rev nil)
logdir tmp)
(setq logdir (expand-file-name category root))
(setq logdir (expand-file-name branch logdir))
(setq logdir (expand-file-name version logdir))
(setq logdir (expand-file-name archive logdir))
(setq logdir (expand-file-name "patch-log" logdir))
(dolist (file (if (file-directory-p logdir) (directory-files logdir)))
;; Revision names go: base-0, patch-N, version-0, versionfix-M.
(when (and (eq (aref file 0) ?v) (not sealed))
(setq sealed t rev-nb 0))
(if (and (string-match "-\\([0-9]+\\)\\'" file)
(setq tmp (string-to-number (match-string 1 file)))
(or (not sealed) (eq (aref file 0) ?v))
(>= tmp rev-nb))
(setq rev-nb tmp rev file)))
;; Use "none-000" if the tree hasn't yet been committed on the
;; default branch. We'll then get "Arch:000[branch]" on the mode-line.
(concat defbranch "--" (or rev "none-000"))))))
(defcustom vc-arch-mode-line-rewrite
'(("\\`.*--\\(.*--.*\\)--\\(v?\\).*-\\([0-9]+\\)\\'" . "\\2\\3[\\1]"))
"Rewrite rules to shorten Arch's revision names on the mode-line."
:type '(repeat (cons regexp string))
:group 'vc)
(defun vc-arch-mode-line-string (file)
"Return string for placement in modeline by `vc-mode-line' for FILE."
(let ((rev (vc-workfile-version file)))
(dolist (rule vc-arch-mode-line-rewrite)
(if (string-match (car rule) rev)
(setq rev (replace-match (cdr rule) t nil rev))))
(format "Arch%c%s"
(case (vc-state file)
((up-to-date needs-patch) ?-)
(added ?@)
(t ?:))
rev)))
(defun vc-arch-diff3-rej-p (rej)
(let ((attrs (file-attributes rej)))
(and attrs (< (nth 7 attrs) 60)
(with-temp-buffer
(insert-file-contents rej)
(goto-char (point-min))
(looking-at "Conflicts occured, diff3 conflict markers left in file\\.")))))
(defun vc-arch-delete-rej-if-obsolete ()
"For use in `after-save-hook'."
(save-excursion
(let ((rej (concat buffer-file-name ".rej")))
(when (and buffer-file-name (vc-arch-diff3-rej-p rej))
(if (not (re-search-forward "^<<<<<<< " nil t))
;; The .rej file is obsolete.
(condition-case nil (delete-file rej) (error nil)))))))
(defun vc-arch-find-file-hook ()
(let ((rej (concat buffer-file-name ".rej")))
(when (and buffer-file-name (file-exists-p rej))
(if (vc-arch-diff3-rej-p rej)
(save-excursion
(goto-char (point-min))
(if (not (re-search-forward "^<<<<<<< " nil t))
;; The .rej file is obsolete.
(condition-case nil (delete-file rej) (error nil))
(smerge-mode 1)
(add-hook 'after-save-hook
'vc-arch-delete-rej-if-obsolete nil t)
(message "There are unresolved conflicts in this file")))
(message "There are unresolved conflicts in %s"
(file-name-nondirectory rej))))))
(defun vc-arch-find-file-not-found-hook ()
;; Do nothing. We are not sure whether the file is `source' or not,
;; so we shouldn't ask the user whether she wants to check it out.
)
(defun vc-arch-checkout-model (file) 'implicit)
(defun vc-arch-checkin (file rev comment)
(if rev (error "Committing to a specific revision is unsupported."))
(let ((summary (file-relative-name file (vc-arch-root file))))
;; Extract a summary from the comment.
(when (or (string-match "\\`Summary:[ \t]*\\(.*[^ \t\n]\\)\\([ \t]*\n\\)*" comment)
(string-match "\\`[ \t]*\\(.*[^ \t\n]\\)[ \t]*\\(\n?\\'\\|\n\\([ \t]*\n\\)+\\)" comment))
(setq summary (match-string 1 comment))
(setq comment (substring comment (match-end 0))))
(vc-arch-command nil 0 file "commit" "-s" summary "-L" comment "--"
(vc-switches 'Arch 'checkin))))
(defun vc-arch-diff (file &optional oldvers newvers buffer)
"Get a difference report using Arch between two versions of FILE."
(if (and newvers
(vc-up-to-date-p file)
(equal newvers (vc-workfile-version file)))
;; Newvers is the base revision and the current file is unchanged,
;; so we can diff with the current file.
(setq newvers nil))
(if newvers
(error "Diffing specific revisions not implemented.")
(let* ((async (fboundp 'start-process))
;; Run the command from the root dir.
(default-directory (vc-arch-root file))
(status
(vc-arch-command
(or buffer "*vc-diff*")
(if async 'async 1)
nil "file-diffs"
;; Arch does not support the typical flags.
;; (vc-switches 'Arch 'diff)
(file-relative-name file)
(if (equal oldvers (vc-workfile-version file))
nil
oldvers))))
(if async 1 status)))) ; async diff, pessimistic assumption.
(defun vc-arch-delete-file (file)
(vc-arch-command nil 0 file "rm"))
(defun vc-arch-rename-file (old new)
(vc-arch-command nil 0 new "mv" (file-relative-name old)))
(defalias 'vc-arch-responsible-p 'vc-arch-root)
(defun vc-arch-command (buffer okstatus file &rest flags)
"A wrapper around `vc-do-command' for use in vc-arch.el."
(apply 'vc-do-command buffer okstatus vc-arch-command file flags))
(defun vc-arch-init-version () nil)
(provide 'vc-arch)
;; arch-tag: a35c7c1c-5237-429d-88ef-3d718fd2e704
;;; vc-arch.el ends here
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