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;;; magit-bisect.el --- bisect support for Magit -*- lexical-binding: t -*-
;; Copyright (C) 2011-2018 The Magit Project Contributors
;;
;; You should have received a copy of the AUTHORS.md file which
;; lists all contributors. If not, see http://magit.vc/authors.
;; Author: Jonas Bernoulli <jonas@bernoul.li>
;; Maintainer: Jonas Bernoulli <jonas@bernoul.li>
;; Magit 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, or (at your option)
;; any later version.
;;
;; Magit 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 Magit. If not, see http://www.gnu.org/licenses.
;;; Commentary:
;; Use a binary search to find the commit that introduced a bug.
;;; Code:
(require 'magit)
;;; Options
(defcustom magit-bisect-show-graph t
"Whether to use `--graph' in the log showing commits yet to be bisected."
:package-version '(magit . "2.8.0")
:group 'magit-status
:type 'boolean)
(defface magit-bisect-good
'((t :foreground "DarkOliveGreen"))
"Face for good bisect revisions."
:group 'magit-faces)
(defface magit-bisect-skip
'((t :foreground "DarkGoldenrod"))
"Face for skipped bisect revisions."
:group 'magit-faces)
(defface magit-bisect-bad
'((t :foreground "IndianRed4"))
"Face for bad bisect revisions."
:group 'magit-faces)
;;; Commands
;;;###autoload (autoload 'magit-bisect-popup "magit-bisect" nil t)
(magit-define-popup magit-bisect-popup
"Popup console for bisect commands."
:man-page "git-bisect"
:actions '((?B "Start" magit-bisect-start)
(?s "Start script" magit-bisect-run))
:sequence-actions '((?b "Bad" magit-bisect-bad)
(?g "Good" magit-bisect-good)
(?k "Skip" magit-bisect-skip)
(?r "Reset" magit-bisect-reset)
(?s "Run script" magit-bisect-run))
:sequence-predicate 'magit-bisect-in-progress-p)
;;;###autoload
(defun magit-bisect-start (bad good)
"Start a bisect session.
Bisecting a bug means to find the commit that introduced it.
This command starts such a bisect session by asking for a know
good and a bad commit. To move the session forward use the
other actions from the bisect popup (\
\\<magit-status-mode-map>\\[magit-bisect-popup])."
(interactive (if (magit-bisect-in-progress-p)
(user-error "Already bisecting")
(magit-bisect-start-read-args)))
(magit-git-bisect "start" (list bad good) t))
(defun magit-bisect-start-read-args ()
(let ((b (magit-read-branch-or-commit "Start bisect with bad revision")))
(list b (magit-read-other-branch-or-commit "Good revision" b))))
;;;###autoload
(defun magit-bisect-reset ()
"After bisecting, cleanup bisection state and return to original `HEAD'."
(interactive)
(magit-confirm 'reset-bisect)
(magit-run-git "bisect" "reset")
(ignore-errors (delete-file (magit-git-dir "BISECT_CMD_OUTPUT"))))
;;;###autoload
(defun magit-bisect-good ()
"While bisecting, mark the current commit as good.
Use this after you have asserted that the commit does not contain
the bug in question."
(interactive)
(magit-git-bisect "good"))
;;;###autoload
(defun magit-bisect-bad ()
"While bisecting, mark the current commit as bad.
Use this after you have asserted that the commit does contain the
bug in question."
(interactive)
(magit-git-bisect "bad"))
;;;###autoload
(defun magit-bisect-skip ()
"While bisecting, skip the current commit.
Use this if for some reason the current commit is not a good one
to test. This command lets Git choose a different one."
(interactive)
(magit-git-bisect "skip"))
;;;###autoload
(defun magit-bisect-run (cmdline &optional bad good)
"Bisect automatically by running commands after each step.
Unlike `git bisect run' this can be used before bisecting has
begun. In that case it behaves like `git bisect start; git
bisect run'."
(interactive (let ((args (and (not (magit-bisect-in-progress-p))
(magit-bisect-start-read-args))))
(cons (read-shell-command "Bisect shell command: ") args)))
(when (and bad good)
(magit-bisect-start bad good))
(magit-git-bisect "run" (list shell-file-name shell-command-switch cmdline)))
(defun magit-git-bisect (subcommand &optional args no-assert)
(unless (or no-assert (magit-bisect-in-progress-p))
(user-error "Not bisecting"))
(magit-with-toplevel
(magit-run-git-with-logfile
(magit-git-dir "BISECT_CMD_OUTPUT") "bisect" subcommand args)))
;;; Sections
(defun magit-bisect-in-progress-p ()
(file-exists-p (magit-git-dir "BISECT_LOG")))
(defun magit-insert-bisect-output ()
"While bisecting, insert section with output from `git bisect'."
(when (magit-bisect-in-progress-p)
(let* ((lines
(or (magit-file-lines (magit-git-dir "BISECT_CMD_OUTPUT"))
(list "Bisecting: (no saved bisect output)"
"It appears you have invoked `git bisect' from a shell."
"There is nothing wrong with that, we just cannot display"
"anything useful here. Consult the shell output instead.")))
(done-re "^\\([a-z0-9]\\{40\\}\\) is the first bad commit$")
(bad-line (or (and (string-match done-re (car lines))
(pop lines))
(--first (string-match done-re it) lines))))
(magit-insert-section ((eval (if bad-line 'commit 'bisect-output))
(and bad-line (match-string 1 bad-line)))
(magit-insert-heading
(propertize (or bad-line (pop lines))
'face 'magit-section-heading))
(dolist (line lines)
(insert line "\n"))))
(insert "\n")))
(defun magit-insert-bisect-rest ()
"While bisecting, insert section visualizing the bisect state."
(when (magit-bisect-in-progress-p)
(magit-insert-section (bisect-view)
(magit-insert-heading "Bisect Rest:")
(magit-git-wash (apply-partially 'magit-log-wash-log 'bisect-vis)
"bisect" "visualize" "git" "log"
"--format=%h%d%x00%s" "--decorate=full"
(and magit-bisect-show-graph "--graph")))))
(defun magit-insert-bisect-log ()
"While bisecting, insert section logging bisect progress."
(when (magit-bisect-in-progress-p)
(magit-insert-section (bisect-log)
(magit-insert-heading "Bisect Log:")
(magit-git-wash #'magit-wash-bisect-log "bisect" "log")
(insert ?\n))))
(defun magit-wash-bisect-log (_args)
(let (beg)
(while (progn (setq beg (point-marker))
(re-search-forward "^\\(git bisect [^\n]+\n\\)" nil t))
(magit-bind-match-strings (heading) nil
(magit-delete-match)
(save-restriction
(narrow-to-region beg (point))
(goto-char (point-min))
(magit-insert-section (bisect-item heading t)
(insert (propertize heading 'face 'magit-section-secondary-heading))
(magit-insert-heading)
(magit-wash-sequence
(apply-partially 'magit-log-wash-rev 'bisect-log
(magit-abbrev-length)))
(insert ?\n)))))
(when (re-search-forward
"# first bad commit: \\[\\([a-z0-9]\\{40\\}\\)\\] [^\n]+\n" nil t)
(magit-bind-match-strings (hash) nil
(magit-delete-match)
(magit-insert-section (bisect-item)
(insert hash " is the first bad commit\n"))))))
(provide 'magit-bisect)
;;; magit-bisect.el ends here
|
