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;;; mq.el --- Emacs support for Mercurial Queues
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;; Copyright (C) 2006 Bryan O'Sullivan
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;; Author: Bryan O'Sullivan <bos@serpentine.com>
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;; mq.el is free software; you can redistribute it and/or modify it
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;; under the terms of version 2 of the GNU General Public License as
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;; published by the Free Software Foundation.
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;; mq.el is distributed in the hope that it will be useful, but
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;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with mq.el, GNU Emacs, or XEmacs; see the file COPYING (`C-h
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;; C-l'). If not, write to the Free Software Foundation, Inc., 59
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;; Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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(require 'mercurial)
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(defcustom mq-mode-hook nil
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"Hook run when a buffer enters mq-mode."
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:type 'sexp
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:group 'mercurial)
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(defcustom mq-global-prefix "\C-cq"
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"The global prefix for Mercurial Queues keymap bindings."
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:type 'sexp
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:group 'mercurial)
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(defcustom mq-edit-mode-hook nil
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"Hook run after a buffer is populated to edit a patch description."
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:type 'sexp
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:group 'mercurial)
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;;; Internal variables.
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(defvar mq-patch-history nil)
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(defvar mq-prev-buffer nil)
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(make-variable-buffer-local 'mq-prev-buffer)
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(put 'mq-prev-buffer 'permanent-local t)
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;;; Global keymap.
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(defvar mq-global-map (make-sparse-keymap))
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(fset 'mq-global-map mq-global-map)
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(global-set-key mq-global-prefix 'mq-global-map)
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(define-key mq-global-map "." 'mq-push)
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(define-key mq-global-map ">" 'mq-push-all)
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(define-key mq-global-map "," 'mq-pop)
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(define-key mq-global-map "<" 'mq-pop-all)
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(define-key mq-global-map "r" 'mq-refresh)
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(define-key mq-global-map "e" 'mq-refresh-edit)
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(define-key mq-global-map "n" 'mq-next)
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(define-key mq-global-map "p" 'mq-previous)
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(define-key mq-global-map "t" 'mq-top)
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;;; Refresh edit mode keymap.
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(defvar mq-edit-mode-map (make-sparse-keymap))
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(define-key mq-edit-mode-map "\C-c\C-c" 'mq-edit-finish)
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(define-key mq-edit-mode-map "\C-c\C-k" 'mq-edit-kill)
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;;; Helper functions.
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(defun mq-read-patch-name (&optional source prompt)
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"Read a patch name to use with a command.
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May return nil, meaning \"use the default\"."
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(let ((patches (split-string
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(hg-chomp (hg-run0 (or source "qseries"))) "\n")))
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(when current-prefix-arg
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(completing-read (format "Patch%s: " (or prompt ""))
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(map 'list 'cons patches patches)
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nil
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nil
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nil
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'mq-patch-history))))
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(defun mq-refresh-buffers (root)
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(save-excursion
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(dolist (buf (hg-buffers-visiting-repo root))
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(when (not (verify-visited-file-modtime buf))
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(set-buffer buf)
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(let ((ctx (hg-buffer-context)))
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(message "Refreshing %s..." (buffer-name))
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(revert-buffer t t t)
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(hg-restore-context ctx)
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(message "Refreshing %s...done" (buffer-name))))))
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(hg-update-mode-lines root))
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(defun mq-last-line ()
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(goto-char (point-max))
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(beginning-of-line)
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(when (looking-at "^$")
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(forward-line -1))
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(let ((bol (point)))
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(end-of-line)
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(let ((line (buffer-substring bol (point))))
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(when (> (length line) 0)
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line))))
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(defun mq-push (&optional patch)
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"Push patches until PATCH is reached.
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If PATCH is nil, push at most one patch."
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(interactive (list (mq-read-patch-name "qunapplied" " to push")))
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(let ((root (hg-root))
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(prev-buf (current-buffer))
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last-line ok)
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(unless root
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(error "Cannot push outside a repository!"))
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(hg-sync-buffers root)
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(let ((buf-name (format "MQ: Push %s" (or patch "next patch"))))
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(kill-buffer (get-buffer-create buf-name))
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(split-window-vertically)
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(other-window 1)
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(switch-to-buffer (get-buffer-create buf-name))
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(cd root)
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(message "Pushing...")
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(setq ok (= 0 (apply 'call-process (hg-binary) nil t t "qpush"
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(if patch (list patch))))
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last-line (mq-last-line))
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(let ((lines (count-lines (point-min) (point-max))))
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(if (and (equal lines 2) (string-match "Now at:" last-line))
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(progn
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(kill-buffer (current-buffer))
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(delete-window))
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(hg-view-mode prev-buf))))
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(mq-refresh-buffers root)
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(sit-for 0)
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(when last-line
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(if ok
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(message "Pushing... %s" last-line)
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(error "Pushing... %s" last-line)))))
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(defun mq-push-all ()
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"Push patches until all are applied."
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(interactive)
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(mq-push "-a"))
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(defun mq-pop (&optional patch)
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"Pop patches until PATCH is reached.
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If PATCH is nil, pop at most one patch."
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(interactive (list (mq-read-patch-name "qapplied" " to pop to")))
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(let ((root (hg-root))
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last-line ok)
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(unless root
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(error "Cannot pop outside a repository!"))
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(hg-sync-buffers root)
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(set-buffer (generate-new-buffer "qpop"))
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(cd root)
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(message "Popping...")
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(setq ok (= 0 (apply 'call-process (hg-binary) nil t t "qpop"
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(if patch (list patch))))
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last-line (mq-last-line))
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(kill-buffer (current-buffer))
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(mq-refresh-buffers root)
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(sit-for 0)
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(when last-line
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(if ok
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(message "Popping... %s" last-line)
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(error "Popping... %s" last-line)))))
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(defun mq-pop-all ()
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"Push patches until none are applied."
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(interactive)
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(mq-pop "-a"))
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(defun mq-refresh-internal (root &rest args)
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(hg-sync-buffers root)
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(let ((patch (mq-patch-info "qtop")))
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(message "Refreshing %s..." patch)
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(let ((ret (apply 'hg-run "qrefresh" args)))
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(if (equal (car ret) 0)
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(message "Refreshing %s... done." patch)
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(error "Refreshing %s... %s" patch (hg-chomp (cdr ret)))))))
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(defun mq-refresh ()
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"Refresh the topmost applied patch."
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(interactive)
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(let ((root (hg-root)))
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(unless root
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(error "Cannot refresh outside of a repository!"))
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(mq-refresh-internal root)))
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(defun mq-patch-info (cmd &optional msg)
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(let* ((ret (hg-run cmd))
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(info (hg-chomp (cdr ret))))
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(if (equal (car ret) 0)
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(if msg
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(message "%s patch: %s" msg info)
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info)
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(error "%s" info))))
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(defun mq-top ()
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"Print the name of the topmost applied patch."
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(interactive)
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(mq-patch-info "qtop" "Top"))
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(defun mq-next ()
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"Print the name of the next patch to be pushed."
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(interactive)
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(mq-patch-info "qnext" "Next"))
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(defun mq-previous ()
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"Print the name of the first patch below the topmost applied patch.
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This would become the active patch if popped to."
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(interactive)
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(mq-patch-info "qprev" "Previous"))
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(defun mq-edit-finish ()
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"Finish editing the description of this patch, and refresh the patch."
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(interactive)
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(unless (equal (mq-patch-info "qtop") mq-top)
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(error "Topmost patch has changed!"))
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(hg-sync-buffers hg-root)
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(mq-refresh-internal hg-root "-m" (buffer-substring (point-min) (point-max)))
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(let ((buf mq-prev-buffer))
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(kill-buffer nil)
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(switch-to-buffer buf)))
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(defun mq-edit-kill ()
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"Kill the edit currently being prepared."
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(interactive)
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(when (or (not (buffer-modified-p)) (y-or-n-p "Really kill this edit? "))
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(let ((buf mq-prev-buffer))
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(kill-buffer nil)
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(switch-to-buffer buf))))
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(defun mq-edit-mode ()
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"Mode for editing the description of a patch.
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Key bindings
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------------
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\\[mq-edit-finish] use this description
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\\[mq-edit-kill] abandon this description"
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(interactive)
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(use-local-map mq-edit-mode-map)
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(set-syntax-table text-mode-syntax-table)
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(setq local-abbrev-table text-mode-abbrev-table
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major-mode 'mq-edit-mode
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mode-name "MQ-Edit")
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(set-buffer-modified-p nil)
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(setq buffer-undo-list nil)
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(run-hooks 'text-mode-hook 'mq-edit-mode-hook))
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(defun mq-refresh-edit ()
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"Refresh the topmost applied patch, editing the patch description."
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(interactive)
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(while mq-prev-buffer
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(set-buffer mq-prev-buffer))
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(let ((root (hg-root))
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(prev-buffer (current-buffer))
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(patch (mq-patch-info "qtop")))
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(hg-sync-buffers root)
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(let ((buf-name (format "*MQ: Edit description of %s*" patch)))
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(switch-to-buffer (get-buffer-create buf-name))
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(when (= (point-min) (point-max))
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(set (make-local-variable 'hg-root) root)
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(set (make-local-variable 'mq-top) patch)
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(setq mq-prev-buffer prev-buffer)
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(insert (hg-run0 "qheader"))
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(goto-char (point-min)))
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(mq-edit-mode)
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(cd root)))
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(message "Type `C-c C-c' to finish editing and refresh the patch."))
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(provide 'mq)
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;;; Local Variables:
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;;; prompt-to-byte-compile: nil
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;;; end:
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