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emacs/lisp/vc-hg.el
Stefan Monnier cc63d28f93 (vc-hg-state, vc-hg-working-revision): Use process-file so 
it works on remote files.
(vc-hg-diff): Don't pass any `--cwd' argument.
2009-10-28 02:05:46 +00:00

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;;; vc-hg.el --- VC backend for the mercurial version control system
;; Copyright (C) 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
;; Author: Ivan Kanis
;; Keywords: tools
;; 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 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; This is a mercurial version control backend
;;; Thanks:
;;; Bugs:
;;; Installation:
;;; Todo:
;; 1) Implement the rest of the vc interface. See the comment at the
;; beginning of vc.el. The current status is:
;; FUNCTION NAME STATUS
;; BACKEND PROPERTIES
;; * revision-granularity OK
;; STATE-QUERYING FUNCTIONS
;; * registered (file) OK
;; * state (file) OK
;; - state-heuristic (file) NOT NEEDED
;; - dir-status (dir update-function) OK
;; - dir-status-files (dir files ds uf) OK
;; - dir-extra-headers (dir) OK
;; - dir-printer (fileinfo) OK
;; * working-revision (file) OK
;; - latest-on-branch-p (file) ??
;; * checkout-model (files) OK
;; - workfile-unchanged-p (file) OK
;; - mode-line-string (file) NOT NEEDED
;; STATE-CHANGING FUNCTIONS
;; * register (files &optional rev comment) OK
;; * create-repo () OK
;; - init-revision () NOT NEEDED
;; - responsible-p (file) OK
;; - could-register (file) OK
;; - receive-file (file rev) ?? PROBABLY NOT NEEDED
;; - unregister (file) COMMENTED OUT, MAY BE INCORRECT
;; * checkin (files rev comment) OK
;; * find-revision (file rev buffer) OK
;; * checkout (file &optional editable rev) OK
;; * revert (file &optional contents-done) OK
;; - rollback (files) ?? PROBABLY NOT NEEDED
;; - merge (file rev1 rev2) NEEDED
;; - merge-news (file) NEEDED
;; - steal-lock (file &optional revision) NOT NEEDED
;; HISTORY FUNCTIONS
;; * print-log (files &optional buffer shortlog)OK
;; - log-view-mode () OK
;; - show-log-entry (revision) NOT NEEDED, DEFAULT IS GOOD
;; - comment-history (file) NOT NEEDED
;; - update-changelog (files) NOT NEEDED
;; * diff (files &optional rev1 rev2 buffer) OK
;; - revision-completion-table (files) OK?
;; - annotate-command (file buf &optional rev) OK
;; - annotate-time () OK
;; - annotate-current-time () NOT NEEDED
;; - annotate-extract-revision-at-line () OK
;; TAG SYSTEM
;; - create-tag (dir name branchp) NEEDED
;; - retrieve-tag (dir name update) NEEDED
;; MISCELLANEOUS
;; - make-version-backups-p (file) ??
;; - repository-hostname (dirname) ??
;; - previous-revision (file rev) OK
;; - next-revision (file rev) OK
;; - check-headers () ??
;; - clear-headers () ??
;; - delete-file (file) TEST IT
;; - rename-file (old new) OK
;; - find-file-hook () PROBABLY NOT NEEDED
;; 2) 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 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 'cl)
(require 'vc)
(require 'vc-dir))
;;; 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)
(defcustom vc-hg-diff-switches t ; Hg doesn't support common args like -u
"String or list of strings specifying switches for Hg diff under VC.
If nil, use the value of `vc-diff-switches'. If t, use no switches."
:type '(choice (const :tag "Unspecified" nil)
(const :tag "None" t)
(string :tag "Argument String")
(repeat :tag "Argument List" :value ("") string))
:version "23.1"
:group 'vc)
;;; Properties of the backend
(defun vc-hg-revision-granularity () 'repository)
(defun vc-hg-checkout-model (files) 'implicit)
;;; State querying functions
;;;###autoload (defun vc-hg-registered (file)
;;;###autoload "Return non-nil if FILE is registered with hg."
;;;###autoload (if (vc-find-root file ".hg") ; short cut
;;;###autoload (progn
;;;###autoload (load "vc-hg")
;;;###autoload (vc-hg-registered file))))
;; Modeled after the similar function in vc-bzr.el
(defun vc-hg-registered (file)
"Return non-nil if FILE is registered with hg."
(when (vc-hg-root file) ; short cut
(let ((state (vc-hg-state file))) ; expensive
(and state (not (memq state '(ignored unregistered)))))))
(defun vc-hg-state (file)
"Hg-specific version of `vc-state'."
(let*
((status nil)
(default-directory (file-name-directory file))
(out
(with-output-to-string
(with-current-buffer
standard-output
(setq status
(condition-case nil
;; Ignore all errors.
(process-file
"hg" nil t nil
"status" "-A" (file-relative-name file))
;; Some problem happened. E.g. We can't find an `hg'
;; executable.
(error nil)))))))
(when (eq 0 status)
(when (null (string-match ".*: No such file or directory$" out))
(let ((state (aref out 0)))
(cond
((eq state ?=) 'up-to-date)
((eq state ?A) 'added)
((eq state ?M) 'edited)
((eq state ?I) 'ignored)
((eq state ?R) 'removed)
((eq state ?!) 'missing)
((eq state ??) 'unregistered)
((eq state ?C) 'up-to-date) ;; Older mercurials use this
(t 'up-to-date)))))))
(defun vc-hg-working-revision (file)
"Hg-specific version of `vc-working-revision'."
(let*
((status nil)
(default-directory (file-name-directory file))
(out
(with-output-to-string
(with-current-buffer
standard-output
(setq status
(condition-case nil
;; Ignore all errors.
(process-file
"hg" nil t nil
"log" "-l1" (file-relative-name file))
;; Some problem happened. E.g. We can't find an `hg'
;; executable.
(error nil)))))))
(when (eq 0 status)
(if (string-match "changeset: *\\([0-9]*\\)" out)
(match-string 1 out)
"0"))))
;;; History functions
(defcustom vc-hg-log-switches nil
"String or list of strings specifying switches for hg log under VC."
:type '(choice (const :tag "None" nil)
(string :tag "Argument String")
(repeat :tag "Argument List" :value ("") string))
:group 'vc-hg)
(defun vc-hg-print-log (files &optional buffer shortlog)
"Get change log associated with FILES."
;; `log-view-mode' needs to have the file names in order to function
;; correctly. "hg log" does not print it, so we insert it here by
;; hand.
;; `vc-do-command' creates the buffer, but we need it before running
;; the command.
(vc-setup-buffer buffer)
;; If the buffer exists from a previous invocation it might be
;; read-only.
(let ((inhibit-read-only t))
(with-current-buffer
buffer
(apply 'vc-hg-command buffer 0 files "log"
(if shortlog
(append '("--style" "compact") vc-hg-log-switches)
vc-hg-log-switches)))))
(defvar log-view-message-re)
(defvar log-view-file-re)
(defvar log-view-font-lock-keywords)
(defvar log-view-per-file-logs)
(defvar vc-short-log)
(define-derived-mode vc-hg-log-view-mode log-view-mode "Hg-Log-View"
(require 'add-log) ;; we need the add-log faces
(set (make-local-variable 'log-view-file-re) "\\`a\\`")
(set (make-local-variable 'log-view-per-file-logs) nil)
(set (make-local-variable 'log-view-message-re)
(if vc-short-log
"^\\([0-9]+\\)\\(?:\\[.*\\]\\)? +\\([0-9a-z]\\{12\\}\\) +\\(\\(?:[0-9]+\\)-\\(?:[0-9]+\\)-\\(?:[0-9]+\\) \\(?:[0-9]+\\):\\(?:[0-9]+\\) \\(?:[-+0-9]+\\)\\) +\\(.*\\)$"
"^changeset:[ \t]*\\([0-9]+\\):\\(.+\\)"))
(set (make-local-variable 'log-view-font-lock-keywords)
(if vc-short-log
(append `((,log-view-message-re
(1 'log-view-message-face)
(2 'log-view-message-face)
(3 'change-log-date)
(4 'change-log-name))))
(append
log-view-font-lock-keywords
'(
;; Handle the case:
;; user: FirstName LastName <foo@bar>
("^user:[ \t]+\\([^<(]+?\\)[ \t]*[(<]\\([A-Za-z0-9_.+-]+@[A-Za-z0-9_.-]+\\)[>)]"
(1 'change-log-name)
(2 'change-log-email))
;; Handle the cases:
;; user: foo@bar
;; and
;; user: foo
("^user:[ \t]+\\([A-Za-z0-9_.+-]+\\(?:@[A-Za-z0-9_.-]+\\)?\\)"
(1 'change-log-email))
("^date: \\(.+\\)" (1 'change-log-date))
("^summary:[ \t]+\\(.+\\)" (1 'log-view-message)))))))
(defun vc-hg-diff (files &optional oldvers newvers buffer)
"Get a difference report using hg between two revisions of FILES."
(let* ((firstfile (car files))
(cwd (if firstfile (file-name-directory firstfile)
(expand-file-name default-directory)))
(working (and firstfile (vc-working-revision firstfile))))
(when (and (equal oldvers working) (not newvers))
(setq oldvers nil))
(when (and (not oldvers) newvers)
(setq oldvers working))
(apply #'vc-hg-command (or buffer "*vc-diff*") nil
(mapcar (lambda (file) (file-relative-name file cwd)) files)
"diff"
(append
(vc-switches 'hg 'diff)
(when oldvers
(if newvers
(list "-r" oldvers "-r" newvers)
(list "-r" oldvers)))))))
(defun vc-hg-revision-table (files)
(let ((default-directory (file-name-directory (car files))))
(with-temp-buffer
(vc-hg-command t nil files "log" "--template" "{rev} ")
(split-string
(buffer-substring-no-properties (point-min) (point-max))))))
;; Modeled after the similar function in vc-cvs.el
(defun vc-hg-revision-completion-table (files)
(lexical-let ((files files)
table)
(setq table (lazy-completion-table
table (lambda () (vc-hg-revision-table files))))
table))
(defun vc-hg-annotate-command (file buffer &optional revision)
"Execute \"hg annotate\" on FILE, inserting the contents in BUFFER.
Optional arg REVISION is a revision to annotate from."
(vc-hg-command buffer 0 file "annotate" "-d" "-n" "--follow"
(when revision (concat "-r" revision))))
(declare-function vc-annotate-convert-time "vc-annotate" (time))
;; The format for one line output by "hg annotate -d -n" looks like this:
;;215 Wed Jun 20 21:22:58 2007 -0700: CONTENTS
;; i.e: VERSION_NUMBER DATE: CONTENTS
;; If the user has set the "--follow" option, the output looks like:
;;215 Wed Jun 20 21:22:58 2007 -0700 foo.c: CONTENTS
;; i.e. VERSION_NUMBER DATE FILENAME: CONTENTS
(defconst vc-hg-annotate-re
"^[ \t]*\\([0-9]+\\) \\(.\\{30\\}\\)\\(?:\\(: \\)\\|\\(?: +\\(.+\\): \\)\\)")
(defun vc-hg-annotate-time ()
(when (looking-at vc-hg-annotate-re)
(goto-char (match-end 0))
(vc-annotate-convert-time
(date-to-time (match-string-no-properties 2)))))
(defun vc-hg-annotate-extract-revision-at-line ()
(save-excursion
(beginning-of-line)
(when (looking-at vc-hg-annotate-re)
(if (match-beginning 3)
(match-string-no-properties 1)
(cons (match-string-no-properties 1)
(expand-file-name (match-string-no-properties 4)))))))
(defun vc-hg-previous-revision (file rev)
(let ((newrev (1- (string-to-number rev))))
(when (>= newrev 0)
(number-to-string newrev))))
(defun vc-hg-next-revision (file rev)
(let ((newrev (1+ (string-to-number rev)))
(tip-revision
(with-temp-buffer
(vc-hg-command t 0 nil "tip")
(goto-char (point-min))
(re-search-forward "^changeset:[ \t]*\\([0-9]+\\):")
(string-to-number (match-string-no-properties 1)))))
;; We don't want to exceed the maximum possible revision number, ie
;; the tip revision.
(when (<= newrev tip-revision)
(number-to-string newrev))))
;; Modeled after the similar function in vc-bzr.el
(defun vc-hg-delete-file (file)
"Delete FILE and delete it in the hg repository."
(condition-case ()
(delete-file file)
(file-error nil))
(vc-hg-command nil 0 file "remove" "--after" "--force"))
;; Modeled after the similar function in vc-bzr.el
(defun vc-hg-rename-file (old new)
"Rename file from OLD to NEW using `hg mv'."
(vc-hg-command nil 0 new "mv" old))
(defun vc-hg-register (files &optional rev comment)
"Register FILES under hg.
REV is ignored.
COMMENT is ignored."
(vc-hg-command nil 0 files "add"))
(defun vc-hg-create-repo ()
"Create a new Mercurial repository."
(vc-hg-command nil 0 nil "init"))
(defalias 'vc-hg-responsible-p 'vc-hg-root)
;; Modeled after the similar function in vc-bzr.el
(defun vc-hg-could-register (file)
"Return non-nil if FILE could be registered under hg."
(and (vc-hg-responsible-p file) ; shortcut
(condition-case ()
(with-temp-buffer
(vc-hg-command t nil file "add" "--dry-run"))
;; The command succeeds with no output if file is
;; registered.
(error))))
;; FIXME: This would remove the file. Is that correct?
;; (defun vc-hg-unregister (file)
;; "Unregister FILE from hg."
;; (vc-hg-command nil nil file "remove"))
(defun vc-hg-checkin (files rev comment)
"Hg-specific version of `vc-backend-checkin'.
REV is ignored."
(vc-hg-command nil 0 files "commit" "-m" comment))
(defun vc-hg-find-revision (file rev buffer)
(let ((coding-system-for-read 'binary)
(coding-system-for-write 'binary))
(if rev
(vc-hg-command buffer 0 file "cat" "-r" rev)
(vc-hg-command buffer 0 file "cat"))))
;; Modeled after the similar function in vc-bzr.el
(defun vc-hg-checkout (file &optional editable rev)
"Retrieve a revision of FILE.
EDITABLE is ignored.
REV is the revision to check out into WORKFILE."
(let ((coding-system-for-read 'binary)
(coding-system-for-write 'binary))
(with-current-buffer (or (get-file-buffer file) (current-buffer))
(if rev
(vc-hg-command t 0 file "cat" "-r" rev)
(vc-hg-command t 0 file "cat")))))
;; Modeled after the similar function in vc-bzr.el
(defun vc-hg-workfile-unchanged-p (file)
(eq 'up-to-date (vc-hg-state file)))
;; Modeled after the similar function in vc-bzr.el
(defun vc-hg-revert (file &optional contents-done)
(unless contents-done
(with-temp-buffer (vc-hg-command t 0 file "revert"))))
;;; Hg specific functionality.
(defvar vc-hg-extra-menu-map
(let ((map (make-sparse-keymap)))
(define-key map [incoming] '(menu-item "Show incoming" vc-hg-incoming))
(define-key map [outgoing] '(menu-item "Show outgoing" vc-hg-outgoing))
map))
(defun vc-hg-extra-menu () vc-hg-extra-menu-map)
(defun vc-hg-extra-status-menu () vc-hg-extra-menu-map)
(defvar log-view-vc-backend)
(define-derived-mode vc-hg-outgoing-mode vc-hg-log-view-mode "Hg-Outgoing"
"Mode for browsing Hg outgoing changes."
(set (make-local-variable 'log-view-vc-backend) 'Hg))
(define-derived-mode vc-hg-incoming-mode vc-hg-log-view-mode "Hg-Incoming"
"Mode for browsing Hg incoming changes."
(set (make-local-variable 'log-view-vc-backend) 'Hg))
(defstruct (vc-hg-extra-fileinfo
(:copier nil)
(:constructor vc-hg-create-extra-fileinfo (rename-state extra-name))
(:conc-name vc-hg-extra-fileinfo->))
rename-state ;; rename or copy state
extra-name) ;; original name for copies and rename targets, new name for
(declare-function vc-default-dir-printer "vc-dir" (backend fileentry))
(defun vc-hg-dir-printer (info)
"Pretty-printer for the vc-dir-fileinfo structure."
(let ((extra (vc-dir-fileinfo->extra info)))
(vc-default-dir-printer 'Hg info)
(when extra
(insert (propertize
(format " (%s %s)"
(case (vc-hg-extra-fileinfo->rename-state extra)
('copied "copied from")
('renamed-from "renamed from")
('renamed-to "renamed to"))
(vc-hg-extra-fileinfo->extra-name extra))
'face 'font-lock-comment-face)))))
(defun vc-hg-after-dir-status (update-function)
(let ((status-char nil)
(file nil)
(translation '((?= . up-to-date)
(?C . up-to-date)
(?A . added)
(?R . removed)
(?M . edited)
(?I . ignored)
(?! . missing)
(? . copy-rename-line)
(?? . unregistered)))
(translated nil)
(result nil)
(last-added nil)
(last-line-copy nil))
(goto-char (point-min))
(while (not (eobp))
(setq translated (cdr (assoc (char-after) translation)))
(setq file
(buffer-substring-no-properties (+ (point) 2)
(line-end-position)))
(cond ((not translated)
(setq last-line-copy nil))
((eq translated 'up-to-date)
(setq last-line-copy nil))
((eq translated 'copy-rename-line)
;; For copied files the output looks like this:
;; A COPIED_FILE_NAME
;; ORIGINAL_FILE_NAME
(setf (nth 2 last-added)
(vc-hg-create-extra-fileinfo 'copied file))
(setq last-line-copy t))
((and last-line-copy (eq translated 'removed))
;; For renamed files the output looks like this:
;; A NEW_FILE_NAME
;; ORIGINAL_FILE_NAME
;; R ORIGINAL_FILE_NAME
;; We need to adjust the previous entry to not think it is a copy.
(setf (vc-hg-extra-fileinfo->rename-state (nth 2 last-added))
'renamed-from)
(push (list file translated
(vc-hg-create-extra-fileinfo
'renamed-to (nth 0 last-added))) result)
(setq last-line-copy nil))
(t
(setq last-added (list file translated nil))
(push last-added result)
(setq last-line-copy nil)))
(forward-line))
(funcall update-function result)))
(defun vc-hg-dir-status (dir update-function)
(vc-hg-command (current-buffer) 'async dir "status" "-C")
(vc-exec-after
`(vc-hg-after-dir-status (quote ,update-function))))
(defun vc-hg-dir-status-files (dir files default-state update-function)
(apply 'vc-hg-command (current-buffer) 'async dir "status" "-C" files)
(vc-exec-after
`(vc-hg-after-dir-status (quote ,update-function))))
(defun vc-hg-dir-extra-header (name &rest commands)
(concat (propertize name 'face 'font-lock-type-face)
(propertize
(with-temp-buffer
(apply 'vc-hg-command (current-buffer) 0 nil commands)
(buffer-substring-no-properties (point-min) (1- (point-max))))
'face 'font-lock-variable-name-face)))
(defun vc-hg-dir-extra-headers (dir)
"Generate extra status headers for a Mercurial tree."
(let ((default-directory dir))
(concat
(vc-hg-dir-extra-header "Root : " "root") "\n"
(vc-hg-dir-extra-header "Branch : " "id" "-b") "\n"
(vc-hg-dir-extra-header "Tags : " "id" "-t") ; "\n"
;; these change after each commit
;; (vc-hg-dir-extra-header "Local num : " "id" "-n") "\n"
;; (vc-hg-dir-extra-header "Global id : " "id" "-i")
)))
;; FIXME: this adds another top level menu, instead figure out how to
;; replace the Log-View menu.
(easy-menu-define log-view-mode-menu vc-hg-outgoing-mode-map
"Hg-outgoing Display Menu"
`("Hg-outgoing"
["Push selected" vc-hg-push]))
(easy-menu-define log-view-mode-menu vc-hg-incoming-mode-map
"Hg-incoming Display Menu"
`("Hg-incoming"
["Pull selected" vc-hg-pull]))
(defun vc-hg-outgoing ()
(interactive)
(let ((bname "*Hg outgoing*")
(vc-short-log nil))
(vc-hg-command bname 1 nil "outgoing" "-n")
(pop-to-buffer bname)
(vc-hg-outgoing-mode)))
(defun vc-hg-incoming ()
(interactive)
(let ((bname "*Hg incoming*")
(vc-short-log nil))
(vc-hg-command bname 0 nil "incoming" "-n")
(pop-to-buffer bname)
(vc-hg-incoming-mode)))
(declare-function log-view-get-marked "log-view" ())
;; XXX maybe also add key bindings for these functions.
(defun vc-hg-push ()
(interactive)
(let ((marked-list (log-view-get-marked)))
(if marked-list
(vc-hg-command
nil 0 nil
(cons "push"
(apply 'nconc
(mapcar (lambda (arg) (list "-r" arg)) marked-list))))
(error "No log entries selected for push"))))
(defun vc-hg-pull ()
(interactive)
(let ((marked-list (log-view-get-marked)))
(if marked-list
(vc-hg-command
nil 0 nil
(cons "pull"
(apply 'nconc
(mapcar (lambda (arg) (list "-r" arg)) marked-list))))
(error "No log entries selected for pull"))))
;;; Internal functions
(defun vc-hg-command (buffer okstatus file-or-list &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 (or buffer "*vc*") okstatus "hg" file-or-list
(if (stringp vc-hg-global-switches)
(cons vc-hg-global-switches flags)
(append vc-hg-global-switches
flags))))
(defun vc-hg-root (file)
(vc-find-root file ".hg"))
(provide 'vc-hg)
;; arch-tag: bd094dc5-715a-434f-a331-37b9fb7cd954
;;; vc-hg.el ends here
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