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;;; bzrmerge.el --- help merge one Emacs bzr branch to another
;; Copyright (C) 2010-2011 Free Software Foundation, Inc.
;; Author: Stefan Monnier <>
;; Keywords:
;; 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
;; 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 <>.
;;; Commentary:
;; Some usage notes are in admin/notes/bzr.
;;; Code:
(require 'cl)) ; assert
(defvar bzrmerge-skip-regexp
"back[- ]?port\\|merge\\|sync\\|re-?generate\\|bump version"
"Regexp matching logs of revisions that might be skipped.
`bzrmerge-missing' will ask you if it should skip any matches.")
(defconst bzrmerge-buffer "*bzrmerge*"
"Working buffer for bzrmerge.")
(defconst bzrmerge-warning-buffer "*bzrmerge warnings*"
"Buffer where bzrmerge will display any warnings.")
(defun bzrmerge-merges ()
"Return the list of already merged (not yet committed) revisions.
The list returned is sorted by oldest-first."
(with-current-buffer (get-buffer-create bzrmerge-buffer)
;; We generally want to make sure we start with a clean tree, but we also
;; want to allow restarts (i.e. with some part of FROM already merged but
;; not yet committed).
(call-process "bzr" nil t nil "status" "-v")
(goto-char (point-min))
(when (re-search-forward "^conflicts:\n" nil t)
(error "You still have unresolved conflicts"))
(let ((merges ()))
(if (not (re-search-forward "^pending merges:\n" nil t))
(when (save-excursion
(goto-char (point-min))
(re-search-forward "^[a-z ]*:\n" nil t))
(error "You still have uncommitted changes"))
;; This is really stupid, but it seems there's no easy way to figure
;; out which revisions have been merged already. The only info I can
;; find is the "pending merges" from "bzr status -v", which is not
;; very machine-friendly.
(while (not (eobp))
(skip-chars-forward " ")
(push (buffer-substring (point) (line-end-position)) merges)
(forward-line 1)))
(defun bzrmerge-check-match (merge)
;; Make sure the MERGES match the revisions on the FROM branch.
;; Stupidly the best form of MERGES I can find is the one from
;; "bzr status -v" which is very machine non-friendly, so I have
;; to do some fuzzy matching.
(let ((author
(if (re-search-forward "^author: *\\([^<]*[^ ]\\) +<.*"
nil t)
(match-string 1)))
(if (re-search-forward
"^committer: *\\([^<]*[^< ]\\) +<" nil t)
(match-string 1)))))
(if (re-search-forward
"^timestamp:[^0-9]*\\([-0-9]+\\)" nil t)
(match-string 1))))
(if (re-search-forward "^message:[ \n]*" nil t)
(buffer-substring (point) (line-end-position))))))
;; The `merge' may have a truncated line1 with "...", so get
;; rid of any "..." and then look for a prefix match.
(when (string-match "\\.+\\'" merge)
(setq merge (substring merge 0 (match-beginning 0))))
(or (string-prefix-p
merge (concat author " " timestamp " " line1))
merge (concat author " " timestamp " [merge] " line1)))))
(defun bzrmerge-missing (from merges)
"Return the list of revisions that need to be merged.
MERGES is the revisions already merged but not yet committed.
Asks about skipping revisions with logs matching `bzrmerge-skip-regexp'.
The result is of the form (TOMERGE . TOSKIP) where TOMERGE and TOSKIP
are both lists of revnos, in oldest-first order."
(with-current-buffer (get-buffer-create bzrmerge-buffer)
(call-process "bzr" nil t nil "missing" "--theirs-only"
(expand-file-name from))
(let ((revnos ()) (skipped ()))
(pop-to-buffer (current-buffer))
(goto-char (point-max))
(while (re-search-backward "^------------------------------------------------------------\nrevno: \\([0-9.]+\\).*" nil t)
(if merges
(while (not (bzrmerge-check-match (pop merges)))
(unless merges
(error "Unmatched tip of merged revisions")))
(let ((case-fold-search t)
(revno (match-string 1))
(skip nil))
(if (string-match "\\." revno)
(error "Unexpected dotted revno!")
(setq revno (string-to-number revno)))
(re-search-forward "^message:\n")
(while (and (not skip)
(re-search-forward bzrmerge-skip-regexp nil t))
(let ((str (buffer-substring (line-beginning-position)
(when (string-match "\\` *" str)
(setq str (substring str (match-end 0))))
(when (string-match "[.!;, ]+\\'" str)
(setq str (substring str 0 (match-beginning 0))))
(if (save-excursion (y-or-n-p (concat str ": Skip? ")))
(setq skip t))))
(if skip
(push revno skipped)
(push revno revnos)))))
(delete-region (point) (point-max)))
(and (or revnos skipped)
(cons (nreverse revnos) (nreverse skipped))))))
(defun bzrmerge-resolve (file)
(unless (file-exists-p file) (error "Bzrmerge-resolve: Can't find %s" file))
(let ((exists (find-buffer-visiting file)))
(with-current-buffer (let ((enable-local-variables :safe))
(find-file-noselect file))
(if (buffer-modified-p)
(error "Unsaved changes in %s" (current-buffer)))
((derived-mode-p 'change-log-mode)
;; Fix up dates before resolving the conflicts.
(goto-char (point-min))
(let ((diff-auto-refine-mode nil))
(while (re-search-forward smerge-begin-re nil t)
(smerge-ensure-match 3)
(let ((start1 (match-beginning 1))
(end1 (match-end 1))
(start3 (match-beginning 3))
(end3 (copy-marker (match-end 3) t)))
(goto-char start3)
(while (re-search-forward change-log-start-entry-re end3 t)
(let* ((str (match-string 0))
(newstr (save-match-data
(concat (add-log-iso8601-time-string)
(when (string-match " *\\'" str)
(match-string 0 str))))))
(replace-match newstr t t)))
;; change-log-resolve-conflict prefers to put match-1's
;; elements first (for equal dates), whereas we want to put
;; match-3's first.
(let ((match3 (buffer-substring start3 end3))
(match1 (buffer-substring start1 end1)))
(delete-region start3 end3)
(goto-char start3)
(insert match1)
(delete-region start1 end1)
(goto-char start1)
(insert match3)))))
;; (pop-to-buffer (current-buffer)) (debug 'before-resolve)
;; Try to resolve the conflicts.
((member file '("configure" "lisp/ldefs-boot.el"
;; We are in the file's buffer, so names are relative.
(call-process "bzr" nil t nil "revert"
(file-name-nondirectory file))
(revert-buffer nil 'noconfirm))
(goto-char (point-max))
(while (re-search-backward smerge-begin-re nil t)
;; (when (derived-mode-p 'change-log-mode)
;; (pop-to-buffer (current-buffer)) (debug 'after-resolve))
(goto-char (point-min))
(prog1 (re-search-forward smerge-begin-re nil t)
(unless exists (kill-buffer))))))))
(defun bzrmerge-add-metadata (from endrevno)
"Add the metadata for a merge of FROM upto ENDREVNO.
Does not make other difference."
(if (with-temp-buffer
(call-process "bzr" nil t nil "status")
(goto-char (point-min))
(re-search-forward "^conflicts:\n" nil t))
(error "Don't know how to add metadata in the presence of conflicts")
(call-process "bzr" nil t nil "shelve" "--all"
"-m" "Bzrmerge shelved merge during skipping")
(call-process "bzr" nil t nil "revert")
(call-process "bzr" nil t nil
"merge" "-r" (format "%s" endrevno) from)
(call-process "bzr" nil t nil "revert" ".")
(call-process "bzr" nil t nil "unshelve")))
(defvar bzrmerge-already-done nil)
(defun bzrmerge-apply (missing from)
(setq from (expand-file-name from))
(with-current-buffer (get-buffer-create bzrmerge-buffer)
(when (equal (cdr bzrmerge-already-done) (list from missing))
(setq missing (car bzrmerge-already-done)))
(setq bzrmerge-already-done nil)
(let ((merge (car missing))
(skip (cdr missing))
(unsafe nil)
beg end)
(when (or merge skip)
((and skip (or (null merge) (< (car skip) (car merge))))
;; Do a "skip" (i.e. merge the meta-data only).
(setq beg (1- (car skip)))
(while (and skip (or (null merge) (< (car skip) (car merge))))
(assert (> (car skip) (or end beg)))
(setq end (pop skip)))
(message "Skipping %s..%s" beg end)
(bzrmerge-add-metadata from end))
;; Do a "normal" merge.
(assert (or (null skip) (< (car merge) (car skip))))
(setq beg (1- (car merge)))
(while (and merge (or (null skip) (< (car merge) (car skip))))
(assert (> (car merge) (or end beg)))
(setq end (pop merge)))
(message "Merging %s..%s" beg end)
(if (with-temp-buffer
(call-process "bzr" nil t nil "status")
(zerop (buffer-size)))
(call-process "bzr" nil t nil
"merge" "-r" (format "%s" end) from)
;; Stupidly, "bzr merge --force -r A..B" dos not maintain the
;; metadata properly except when the checkout is clean.
(call-process "bzr" nil t nil "merge"
"--force" "-r" (format "%s..%s" beg end) from)
;; The merge did not update the metadata, so force the next time
;; around to update it (as a "skip").
(setq unsafe t)
(push end skip))
(pop-to-buffer (current-buffer))
(sit-for 1)
;; (debug 'after-merge)
;; Check the conflicts.
;; FIXME if using the helpful bzr changelog_merge plugin,
;; there are normally no conflicts in ChangeLogs.
;; But we still want the dates fixing, like bzrmerge-resolve does.
(let ((conflicted nil)
(files ()))
(goto-char (point-min))
(when (re-search-forward "bzr: ERROR:" nil t)
(error "Internal Bazaar error!!"))
(while (re-search-forward "^Text conflict in " nil t)
(push (buffer-substring (point) (line-end-position)) files))
(if (re-search-forward "^\\([0-9]+\\) conflicts encountered" nil t)
(if (/= (length files) (string-to-number (match-string 1)))
(setq conflicted t))
(if files (setq conflicted t)))
(dolist (file files)
(if (bzrmerge-resolve file)
(setq conflicted t)))
(when conflicted
(setq bzrmerge-already-done
(list (cons merge skip) from missing))
(if unsafe
;; FIXME: Obviously, we'd rather make it right rather
;; than output such a warning. But I don't know how to add
;; the metadata to bzr's since the technique used in
;; bzrmerge-add-metadata does not work when there
;; are conflicts.
(display-warning 'bzrmerge "Resolve conflicts manually.
¡BEWARE! Important metadata is kept in this Emacs session!
Do not commit without re-running `M-x bzrmerge' first!"
:warning bzrmerge-warning-buffer))
(error "Resolve conflicts manually")))))
(cons merge skip)))))
(defun bzrmerge (from)
"Merge from branch FROM into `default-directory'."
(let ((def
(call-process "bzr" nil t nil "info")
(goto-char (point-min))
(when (re-search-forward "submit branch: *" nil t)
(buffer-substring (point) (line-end-position))))))
(read-file-name "From branch: " nil nil nil def))))
;; Eg we ran bzrmerge once, it stopped with conflicts, we fixed them
;; and are running it again.
(if (get-buffer bzrmerge-warning-buffer)
(kill-buffer bzrmerge-warning-buffer))
(message "Merging from %s..." from)
(require 'vc-bzr)
(let ((default-directory (or (vc-bzr-root default-directory)
(error "Not in a Bzr tree"))))
;; First, check the status.
(let* ((merges (bzrmerge-merges))
;; OK, we have the status, now check the missing data.
(missing (bzrmerge-missing from merges)))
(if (not missing)
(message "Merging from %s...nothing to merge" from)
(while missing
(setq missing (bzrmerge-apply missing from)))
(message "Merging from %s...done" from)))))
(provide 'bzrmerge)
;;; bzrmerge.el ends here
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