;;; mq.el --- Emacs support for Mercurial Queues
;; Copyright (C) 2006 Bryan O'Sullivan
;; Author: Bryan O'Sullivan <bos@serpentine.com>
;; mq.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.
;; mq.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 mq.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.
(require 'mercurial)
(defcustom mq-mode-hook nil
"Hook run when a buffer enters mq-mode."
:type 'sexp
:group 'mercurial)
(defcustom mq-global-prefix "\C-cq"
"The global prefix for Mercurial Queues keymap bindings."
:type 'sexp
:group 'mercurial)
(defcustom mq-edit-mode-hook nil
"Hook run after a buffer is populated to edit a patch description."
:type 'sexp
:group 'mercurial)
;;; Internal variables.
(defvar mq-mode nil
"Is this file managed by MQ?")
(make-variable-buffer-local 'mq-mode)
(put 'mq-mode 'permanent-local t)
(defvar mq-patch-history nil)
(defvar mq-top-patch '(nil))
(defvar mq-prev-buffer nil)
(make-variable-buffer-local 'mq-prev-buffer)
(put 'mq-prev-buffer 'permanent-local t)
;;; Global keymap.
(defvar mq-global-map (make-sparse-keymap))
(fset 'mq-global-map mq-global-map)
(global-set-key mq-global-prefix 'mq-global-map)
(define-key mq-global-map "." 'mq-push)
(define-key mq-global-map ">" 'mq-push-all)
(define-key mq-global-map "," 'mq-pop)
(define-key mq-global-map "<" 'mq-pop-all)
(define-key mq-global-map "r" 'mq-refresh)
(define-key mq-global-map "e" 'mq-refresh-edit)
(define-key mq-global-map "n" 'mq-next)
(define-key mq-global-map "p" 'mq-previous)
(define-key mq-global-map "t" 'mq-top)
(add-minor-mode 'mq-mode 'mq-mode)
;;; Refresh edit mode keymap.
(defvar mq-edit-mode-map (make-sparse-keymap))
(define-key mq-edit-mode-map "\C-c\C-c" 'mq-edit-finish)
(define-key mq-edit-mode-map "\C-c\C-k" 'mq-edit-kill)
;;; Helper functions.
(defun mq-read-patch-name (&optional source prompt)
"Read a patch name to use with a command.
May return nil, meaning \"use the default\"."
(let ((patches (split-string
(hg-chomp (hg-run0 (or source "qseries"))) "\n")))
(when current-prefix-arg
(completing-read (format "Patch%s: " (or prompt ""))
(map 'list 'cons patches patches)
nil
nil
nil
'mq-patch-history))))
(defun mq-refresh-buffers (root)
(save-excursion
(dolist (buf (hg-buffers-visiting-repo root))
(when (not (verify-visited-file-modtime buf))
(set-buffer buf)
(let ((ctx (hg-buffer-context)))
(message "Refreshing %s..." (buffer-name))
(revert-buffer t t t)
(hg-restore-context ctx)
(message "Refreshing %s...done" (buffer-name))))))
(hg-update-mode-lines root)
(mq-update-mode-lines root))
(defun mq-last-line ()
(goto-char (point-max))
(beginning-of-line)
(when (looking-at "^$")
(forward-line -1))
(let ((bol (point)))
(end-of-line)
(let ((line (buffer-substring bol (point))))
(when (> (length line) 0)
line))))
(defun mq-push (&optional patch)
"Push patches until PATCH is reached.
If PATCH is nil, push at most one patch."
(interactive (list (mq-read-patch-name "qunapplied" " to push")))
(let ((root (hg-root))
(prev-buf (current-buffer))
last-line ok)
(unless root
(error "Cannot push outside a repository!"))
(hg-sync-buffers root)
(let ((buf-name (format "MQ: Push %s" (or patch "next patch"))))
(kill-buffer (get-buffer-create buf-name))
(split-window-vertically)
(other-window 1)
(switch-to-buffer (get-buffer-create buf-name))
(cd root)
(message "Pushing...")
(setq ok (= 0 (apply 'call-process (hg-binary) nil t t "qpush"
(if patch (list patch))))
last-line (mq-last-line))
(let ((lines (count-lines (point-min) (point-max))))
(if (and (equal lines 2) (string-match "Now at:" last-line))
(progn
(kill-buffer (current-buffer))
(delete-window))
(hg-view-mode prev-buf))))
(mq-refresh-buffers root)
(sit-for 0)
(when last-line
(if ok
(message "Pushing... %s" last-line)
(error "Pushing... %s" last-line)))))
(defun mq-push-all ()
"Push patches until all are applied."
(interactive)
(mq-push "-a"))
(defun mq-pop (&optional patch)
"Pop patches until PATCH is reached.
If PATCH is nil, pop at most one patch."
(interactive (list (mq-read-patch-name "qapplied" " to pop to")))
(let ((root (hg-root))
last-line ok)
(unless root
(error "Cannot pop outside a repository!"))
(hg-sync-buffers root)
(set-buffer (generate-new-buffer "qpop"))
(cd root)
(message "Popping...")
(setq ok (= 0 (apply 'call-process (hg-binary) nil t t "qpop"
(if patch (list patch))))
last-line (mq-last-line))
(kill-buffer (current-buffer))
(mq-refresh-buffers root)
(sit-for 0)
(when last-line
(if ok
(message "Popping... %s" last-line)
(error "Popping... %s" last-line)))))
(defun mq-pop-all ()
"Push patches until none are applied."
(interactive)
(mq-pop "-a"))
(defun mq-refresh-internal (root &rest args)
(hg-sync-buffers root)
(let ((patch (mq-patch-info "qtop")))
(message "Refreshing %s..." patch)
(let ((ret (apply 'hg-run "qrefresh" args)))
(if (equal (car ret) 0)
(message "Refreshing %s... done." patch)
(error "Refreshing %s... %s" patch (hg-chomp (cdr ret)))))))
(defun mq-refresh ()
"Refresh the topmost applied patch."
(interactive)
(let ((root (hg-root)))
(unless root
(error "Cannot refresh outside of a repository!"))
(mq-refresh-internal root)))
(defun mq-patch-info (cmd &optional msg)
(let* ((ret (hg-run cmd))
(info (hg-chomp (cdr ret))))
(if (equal (car ret) 0)
(if msg
(message "%s patch: %s" msg info)
info)
(error "%s" info))))
(defun mq-top ()
"Print the name of the topmost applied patch."
(interactive)
(mq-patch-info "qtop" "Top"))
(defun mq-next ()
"Print the name of the next patch to be pushed."
(interactive)
(mq-patch-info "qnext" "Next"))
(defun mq-previous ()
"Print the name of the first patch below the topmost applied patch.
This would become the active patch if popped to."
(interactive)
(mq-patch-info "qprev" "Previous"))
(defun mq-edit-finish ()
"Finish editing the description of this patch, and refresh the patch."
(interactive)
(unless (equal (mq-patch-info "qtop") mq-top)
(error "Topmost patch has changed!"))
(hg-sync-buffers hg-root)
(mq-refresh-internal hg-root "-m" (buffer-substring (point-min) (point-max)))
(let ((buf mq-prev-buffer))
(kill-buffer nil)
(switch-to-buffer buf)))
(defun mq-edit-kill ()
"Kill the edit currently being prepared."
(interactive)
(when (or (not (buffer-modified-p)) (y-or-n-p "Really kill this edit? "))
(let ((buf mq-prev-buffer))
(kill-buffer nil)
(switch-to-buffer buf))))
(defun mq-get-top (root)
(let ((entry (assoc root mq-top-patch)))
(if entry
(cdr entry))))
(defun mq-set-top (root patch)
(let ((entry (assoc root mq-top-patch)))
(if entry
(if patch
(setcdr entry patch)
(setq mq-top-patch (delq entry mq-top-patch)))
(setq mq-top-patch (cons (cons root patch) mq-top-patch)))))
(defun mq-update-mode-lines (root)
(let ((cwd default-directory))
(cd root)
(condition-case nil
(mq-set-top root (mq-patch-info "qtop"))
(error (mq-set-top root nil)))
(cd cwd))
(let ((patch (mq-get-top root)))
(save-excursion
(dolist (buf (hg-buffers-visiting-repo root))
(set-buffer buf)
(if mq-mode
(setq mq-mode (or (and patch (concat " MQ:" patch)) " MQ")))))))
(defun mq-mode (&optional arg)
"Minor mode for Mercurial repositories with an MQ patch queue"
(interactive "i")
(cond ((hg-root)
(setq mq-mode (if (null arg) (not mq-mode)
arg))
(mq-update-mode-lines (hg-root))))
(run-hooks 'mq-mode-hook))
(defun mq-edit-mode ()
"Mode for editing the description of a patch.
Key bindings
------------
\\[mq-edit-finish] use this description
\\[mq-edit-kill] abandon this description"
(interactive)
(use-local-map mq-edit-mode-map)
(set-syntax-table text-mode-syntax-table)
(setq local-abbrev-table text-mode-abbrev-table
major-mode 'mq-edit-mode
mode-name "MQ-Edit")
(set-buffer-modified-p nil)
(setq buffer-undo-list nil)
(run-hooks 'text-mode-hook 'mq-edit-mode-hook))
(defun mq-refresh-edit ()
"Refresh the topmost applied patch, editing the patch description."
(interactive)
(while mq-prev-buffer
(set-buffer mq-prev-buffer))
(let ((root (hg-root))
(prev-buffer (current-buffer))
(patch (mq-patch-info "qtop")))
(hg-sync-buffers root)
(let ((buf-name (format "*MQ: Edit description of %s*" patch)))
(switch-to-buffer (get-buffer-create buf-name))
(when (= (point-min) (point-max))
(set (make-local-variable 'hg-root) root)
(set (make-local-variable 'mq-top) patch)
(setq mq-prev-buffer prev-buffer)
(insert (hg-run0 "qheader"))
(goto-char (point-min)))
(mq-edit-mode)
(cd root)))
(message "Type `C-c C-c' to finish editing and refresh the patch."))
(provide 'mq)
;;; Local Variables:
;;; prompt-to-byte-compile: nil
;;; end: