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+;;; magit-log.el --- inspect Git history  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2010-2018  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:
+
+;; This library implements support for looking at Git logs, including
+;; special logs like reflogs and cherry-logs, as well as for selecting
+;; a commit from a log.
+
+;;; Code:
+
+(require 'magit-core)
+(require 'magit-diff)
+
+(declare-function magit-blob-visit "magit-files" (blob-or-file line))
+(declare-function magit-insert-head-branch-header "magit-status"
+                  (&optional branch))
+(declare-function magit-insert-upstream-branch-header "magit-status"
+                  (&optional branch pull keyword))
+(declare-function magit-read-file-from-rev "magit-files"
+                  (rev prompt &optional default))
+(declare-function magit-show-commit "magit-diff"
+                  (arg1 &optional arg2 arg3 arg4))
+(defvar magit-refs-focus-column-width)
+(defvar magit-refs-margin)
+(defvar magit-refs-show-commit-count)
+(defvar magit-buffer-margin)
+(defvar magit-status-margin)
+(defvar magit-status-sections-hook)
+
+(require 'ansi-color)
+(require 'crm)
+(require 'which-func)
+
+(defvar bookmark-make-record-function)
+
+;;; Options
+;;;; Log Mode
+
+(defgroup magit-log nil
+  "Inspect and manipulate Git history."
+  :link '(info-link "(magit)Logging")
+  :group 'magit-modes)
+
+(defcustom magit-log-mode-hook nil
+  "Hook run after entering Magit-Log mode."
+  :group 'magit-log
+  :type 'hook)
+
+(defcustom magit-log-arguments '("-n256" "--graph" "--decorate")
+  "The log arguments used in `magit-log-mode' buffers."
+  :package-version '(magit . "2.3.0")
+  :group 'magit-git-arguments
+  :group 'magit-log
+  :type '(repeat (string :tag "Argument")))
+
+(defcustom magit-log-remove-graph-args '("--follow" "--grep" "-G" "-S" "-L")
+  "The log arguments that cause the `--graph' argument to be dropped."
+  :package-version '(magit . "2.3.0")
+  :group 'magit-log
+  :type '(repeat (string :tag "Argument"))
+  :options '("--follow" "--grep" "-G" "-S" "-L"))
+
+(defcustom magit-log-revision-headers-format "\
+%+b
+Author:    %aN <%aE>
+Committer: %cN <%cE>"
+  "Additional format string used with the `++header' argument."
+  :package-version '(magit . "2.3.0")
+  :group 'magit-log
+  :type 'string)
+
+(defcustom magit-log-auto-more nil
+  "Insert more log entries automatically when moving past the last entry.
+Only considered when moving past the last entry with
+`magit-goto-*-section' commands."
+  :group 'magit-log
+  :type 'boolean)
+
+(defcustom magit-log-margin '(t age magit-log-margin-width t 18)
+  "Format of the margin in `magit-log-mode' buffers.
+
+The value has the form (INIT STYLE WIDTH AUTHOR AUTHOR-WIDTH).
+
+If INIT is non-nil, then the margin is shown initially.
+STYLE controls how to format the committer date.  It can be one
+  of `age' (to show the age of the commit), `age-abbreviated' (to
+  abbreviate the time unit to a character), or a string (suitable
+  for `format-time-string') to show the actual date.
+WIDTH controls the width of the margin.  This exists for forward
+  compatibility and currently the value should not be changed.
+AUTHOR controls whether the name of the author is also shown by
+  default.
+AUTHOR-WIDTH has to be an integer.  When the name of the author
+  is shown, then this specifies how much space is used to do so."
+  :package-version '(magit . "2.9.0")
+  :group 'magit-log
+  :group 'magit-margin
+  :type magit-log-margin--custom-type
+  :initialize 'magit-custom-initialize-reset
+  :set (apply-partially #'magit-margin-set-variable 'magit-log-mode))
+
+(defcustom magit-log-show-refname-after-summary nil
+  "Whether to show refnames after commit summaries.
+This is useful if you use really long branch names."
+  :package-version '(magit . "2.2.0")
+  :group 'magit-log
+  :type 'boolean)
+
+(defcustom magit-log-highlight-keywords t
+  "Whether to highlight bracketed keywords in commit summaries."
+  :package-version '(magit . "2.12.0")
+  :group 'magit-log
+  :type 'boolean)
+
+(defcustom magit-log-header-line-function 'magit-log-header-line-sentence
+  "Function used to generate text shown in header line of log buffers."
+  :package-version '(magit . "2.12.0")
+  :group 'magit-log
+  :type '(choice (function-item magit-log-header-line-arguments)
+                 (function-item magit-log-header-line-sentence)
+                 function))
+
+(defface magit-log-graph
+  '((((class color) (background light)) :foreground "grey30")
+    (((class color) (background  dark)) :foreground "grey80"))
+  "Face for the graph part of the log output."
+  :group 'magit-faces)
+
+(defface magit-log-author
+  '((((class color) (background light)) :foreground "firebrick")
+    (((class color) (background  dark)) :foreground "tomato"))
+  "Face for the author part of the log output."
+  :group 'magit-faces)
+
+(defface magit-log-date
+  '((((class color) (background light)) :foreground "grey30")
+    (((class color) (background  dark)) :foreground "grey80"))
+  "Face for the date part of the log output."
+  :group 'magit-faces)
+
+(defface magit-header-line-log-select
+  '((t :inherit bold))
+  "Face for the `header-line' in `magit-log-select-mode'."
+  :group 'magit-faces)
+
+;;;; File Log
+
+(defcustom magit-log-buffer-file-locked t
+  "Whether `magit-log-buffer-file' uses a dedicated buffer."
+  :package-version '(magit . "2.7.0")
+  :group 'magit-commands
+  :group 'magit-log
+  :type 'boolean)
+
+;;;; Select Mode
+
+(defcustom magit-log-select-arguments '("-n256" "--decorate")
+  "The log arguments used in `magit-log-select-mode' buffers."
+  :package-version '(magit . "2.3.0")
+  :group 'magit-log
+  :type '(repeat (string :tag "Argument")))
+
+(defcustom magit-log-select-show-usage 'both
+  "Whether to show usage information when selecting a commit from a log.
+The message can be shown in the `echo-area' or the `header-line', or in
+`both' places.  If the value isn't one of these symbols, then it should
+be nil, in which case no usage information is shown."
+  :package-version '(magit . "2.1.0")
+  :group 'magit-log
+  :type '(choice (const :tag "in echo-area" echo-area)
+                 (const :tag "in header-line" header-line)
+                 (const :tag "in both places" both)
+                 (const :tag "nowhere")))
+
+(defcustom magit-log-select-margin
+  (list (nth 0 magit-log-margin)
+        (nth 1 magit-log-margin)
+        'magit-log-margin-width t
+        (nth 4 magit-log-margin))
+  "Format of the margin in `magit-log-select-mode' buffers.
+
+The value has the form (INIT STYLE WIDTH AUTHOR AUTHOR-WIDTH).
+
+If INIT is non-nil, then the margin is shown initially.
+STYLE controls how to format the committer date.  It can be one
+  of `age' (to show the age of the commit), `age-abbreviated' (to
+  abbreviate the time unit to a character), or a string (suitable
+  for `format-time-string') to show the actual date.
+WIDTH controls the width of the margin.  This exists for forward
+  compatibility and currently the value should not be changed.
+AUTHOR controls whether the name of the author is also shown by
+  default.
+AUTHOR-WIDTH has to be an integer.  When the name of the author
+  is shown, then this specifies how much space is used to do so."
+  :package-version '(magit . "2.9.0")
+  :group 'magit-log
+  :group 'magit-margin
+  :type magit-log-margin--custom-type
+  :initialize 'magit-custom-initialize-reset
+  :set-after '(magit-log-margin)
+  :set (apply-partially #'magit-margin-set-variable 'magit-log-select-mode))
+
+;;;; Cherry Mode
+
+(defcustom magit-cherry-sections-hook
+  '(magit-insert-cherry-headers
+    magit-insert-cherry-commits)
+  "Hook run to insert sections into the cherry buffer."
+  :package-version '(magit . "2.1.0")
+  :group 'magit-log
+  :type 'hook)
+
+(defcustom magit-cherry-margin
+  (list (nth 0 magit-log-margin)
+        (nth 1 magit-log-margin)
+        'magit-log-margin-width t
+        (nth 4 magit-log-margin))
+  "Format of the margin in `magit-cherry-mode' buffers.
+
+The value has the form (INIT STYLE WIDTH AUTHOR AUTHOR-WIDTH).
+
+If INIT is non-nil, then the margin is shown initially.
+STYLE controls how to format the committer date.  It can be one
+  of `age' (to show the age of the commit), `age-abbreviated' (to
+  abbreviate the time unit to a character), or a string (suitable
+  for `format-time-string') to show the actual date.
+WIDTH controls the width of the margin.  This exists for forward
+  compatibility and currently the value should not be changed.
+AUTHOR controls whether the name of the author is also shown by
+  default.
+AUTHOR-WIDTH has to be an integer.  When the name of the author
+  is shown, then this specifies how much space is used to do so."
+  :package-version '(magit . "2.9.0")
+  :group 'magit-log
+  :group 'magit-margin
+  :type magit-log-margin--custom-type
+  :initialize 'magit-custom-initialize-reset
+  :set-after '(magit-log-margin)
+  :set (apply-partially #'magit-margin-set-variable 'magit-cherry-mode))
+
+;;;; Reflog Mode
+
+(defcustom magit-reflog-arguments '("-n256")
+  "The log arguments used in `magit-reflog-mode' buffers."
+  :package-version '(magit . "2.3.0")
+  :group 'magit-git-arguments
+  :type '(repeat (string :tag "Argument")))
+
+(defcustom magit-reflog-margin
+  (list (nth 0 magit-log-margin)
+        (nth 1 magit-log-margin)
+        'magit-log-margin-width nil
+        (nth 4 magit-log-margin))
+  "Format of the margin in `magit-reflog-mode' buffers.
+
+The value has the form (INIT STYLE WIDTH AUTHOR AUTHOR-WIDTH).
+
+If INIT is non-nil, then the margin is shown initially.
+STYLE controls how to format the committer date.  It can be one
+  of `age' (to show the age of the commit), `age-abbreviated' (to
+  abbreviate the time unit to a character), or a string (suitable
+  for `format-time-string') to show the actual date.
+WIDTH controls the width of the margin.  This exists for forward
+  compatibility and currently the value should not be changed.
+AUTHOR controls whether the name of the author is also shown by
+  default.
+AUTHOR-WIDTH has to be an integer.  When the name of the author
+  is shown, then this specifies how much space is used to do so."
+  :package-version '(magit . "2.9.0")
+  :group 'magit-log
+  :group 'magit-margin
+  :type magit-log-margin--custom-type
+  :initialize 'magit-custom-initialize-reset
+  :set-after '(magit-log-margin)
+  :set (apply-partially #'magit-margin-set-variable 'magit-reflog-mode))
+
+(defface magit-reflog-commit '((t :foreground "green"))
+  "Face for commit commands in reflogs."
+  :group 'magit-faces)
+
+(defface magit-reflog-amend '((t :foreground "magenta"))
+  "Face for amend commands in reflogs."
+  :group 'magit-faces)
+
+(defface magit-reflog-merge '((t :foreground "green"))
+  "Face for merge, checkout and branch commands in reflogs."
+  :group 'magit-faces)
+
+(defface magit-reflog-checkout '((t :foreground "blue"))
+  "Face for checkout commands in reflogs."
+  :group 'magit-faces)
+
+(defface magit-reflog-reset '((t :foreground "red"))
+  "Face for reset commands in reflogs."
+  :group 'magit-faces)
+
+(defface magit-reflog-rebase '((t :foreground "magenta"))
+  "Face for rebase commands in reflogs."
+  :group 'magit-faces)
+
+(defface magit-reflog-cherry-pick '((t :foreground "green"))
+  "Face for cherry-pick commands in reflogs."
+  :group 'magit-faces)
+
+(defface magit-reflog-remote '((t :foreground "cyan"))
+  "Face for pull and clone commands in reflogs."
+  :group 'magit-faces)
+
+(defface magit-reflog-other '((t :foreground "cyan"))
+  "Face for other commands in reflogs."
+  :group 'magit-faces)
+
+;;;; Log Sections
+
+(defcustom magit-log-section-commit-count 10
+  "How many recent commits to show in certain log sections.
+How many recent commits `magit-insert-recent-commits' and
+`magit-insert-unpulled-from-upstream-or-recent' (provided
+the upstream isn't ahead of the current branch) show."
+  :package-version '(magit . "2.1.0")
+  :group 'magit-status
+  :type 'number)
+
+(defcustom magit-log-section-arguments '("-n256" "--decorate")
+  "The log arguments used in buffers that show other things besides logs."
+  :package-version '(magit . "2.4.0")
+  :group 'magit-git-arguments
+  :group 'magit-log
+  :group 'magit-status
+  :type '(repeat (string :tag "Argument")))
+
+;;; Commands
+;;;; Popups
+
+(defvar magit-log-popup
+  '(:variable magit-log-arguments
+    :man-page "git-log"
+    :switches ((?g "Show graph"              "--graph")
+               (?c "Show graph in color"     "--color")
+               (?d "Show refnames"           "--decorate")
+               (?S "Show signatures"         "--show-signature")
+               (?u "Show diffs"              "--patch")
+               (?s "Show diffstats"          "--stat")
+               (?h "Show header"             "++header" magit-log++header)
+               (?r "Show in reverse order"   "--reverse")
+               (?D "Simplify by decoration"  "--simplify-by-decoration")
+               (?f "Follow renames when showing single-file log" "--follow"))
+    :options  ((?n "Limit number of commits" "-n")
+               (?f "Limit to files"          "-- " magit-read-files)
+               (?a "Limit to author"         "--author=")
+               (?o "Order commits by"        "++order=" magit-log-select-order)
+               (?g "Search messages"         "--grep=")
+               (?G "Search changes"          "-G")
+               (?S "Search occurrences"      "-S")
+               (?L "Trace line evolution"    "-L" magit-read-file-trace))
+    :actions  ((?l "Log current"             magit-log-current)
+               (?L "Log local branches"      magit-log-branches)
+               (?r "Reflog current"          magit-reflog-current)
+               (?o "Log other"               magit-log)
+               (?b "Log all branches"        magit-log-all-branches)
+               (?O "Reflog other"            magit-reflog)
+               (?h "Log HEAD"                magit-log-head)
+               (?a "Log all references"      magit-log-all)
+               (?H "Reflog HEAD"             magit-reflog-head))
+    :default-action magit-log-current
+    :max-action-columns 3))
+
+(defvar magit-log-mode-refresh-popup
+  '(:variable magit-log-arguments
+    :man-page "git-log"
+    :switches ((?g "Show graph"              "--graph")
+               (?c "Show graph in color"     "--color")
+               (?d "Show refnames"           "--decorate")
+               (?S "Show signatures"         "--show-signature")
+               (?u "Show diffs"              "--patch")
+               (?s "Show diffstats"          "--stat")
+               (?r "Show in reverse order"   "--reverse")
+               (?D "Simplify by decoration"  "--simplify-by-decoration")
+               (?f "Follow renames when showing single-file log" "--follow"))
+    :options  ((?n "Limit number of commits" "-n")
+               (?f "Limit to files"          "-- " magit-read-files)
+               (?a "Limit to author"         "--author=")
+               (?o "Order commits by"        "++order=" magit-log-select-order)
+               (?g "Search messages"         "--grep=")
+               (?G "Search changes"          "-G")
+               (?S "Search occurrences"      "-S")
+               (?L "Trace line evolution"    "-L" magit-read-file-trace))
+    :actions  ((?g "Refresh"       magit-log-refresh)
+               (?L "Toggle margin" magit-toggle-margin)
+               (?s "Set defaults"  magit-log-set-default-arguments) nil
+               (?w "Save defaults" magit-log-save-default-arguments))
+    :max-action-columns 2))
+
+(defvar magit-reflog-mode-refresh-popup
+  '(:variable magit-reflog-arguments
+    :man-page "git-reflog"
+    :options  ((?n "Limit number of commits" "-n"))))
+
+(defvar magit-log-refresh-popup
+  '(:variable magit-log-arguments
+    :man-page "git-log"
+    :switches ((?g "Show graph"          "--graph")
+               (?c "Show graph in color" "--color")
+               (?d "Show refnames"       "--decorate"))
+    :options  ((?n "Limit number of commits" "-n")
+               (?o "Order commits by"        "++order=" magit-log-select-order))
+    :actions  ("Refresh"
+               (?g "buffer"                   magit-log-refresh)
+               (?s "buffer and set defaults"  magit-log-set-default-arguments)
+               (?w "buffer and save defaults" magit-log-save-default-arguments)
+               "Margin"
+               (?L "toggle visibility" magit-toggle-margin)
+               (?l "cycle style"       magit-cycle-margin-style)
+               (?d "toggle details"    magit-toggle-margin-details))
+    :max-action-columns 1))
+
+(magit-define-popup-keys-deferred 'magit-log-popup)
+(magit-define-popup-keys-deferred 'magit-log-mode-refresh-popup)
+(magit-define-popup-keys-deferred 'magit-log-refresh-popup)
+
+(defun magit-read-file-trace (&rest _ignored)
+  (let ((file  (magit-read-file-from-rev "HEAD" "File"))
+        (trace (magit-read-string "Trace")))
+    (if (string-match
+         "^\\(/.+/\\|:[^:]+\\|[0-9]+,[-+]?[0-9]+\\)\\(:\\)?$" trace)
+        (concat trace (or (match-string 2 trace) ":") file)
+      (user-error "Trace is invalid, see man git-log"))))
+
+(defun magit-log-select-order (&rest _ignored)
+  "Set one `--<value>-order' option in Git log.
+This encompasses the options `--author-date-order',
+`--date-order', and `--topo-order'."
+  (magit-read-char-case "Order commits by " t
+    (?t "[t]opography"     "topo")
+    (?a "[a]uthor date"    "author-date")
+    (?c "[c]ommitter date" "date")))
+
+;; This is a dummy procedure used to show help in `magit-log-popup'.
+(defun magit-log++header ()
+  "Insert a header after each revision summary in Git log.
+Customize `magit-log-revision-headers-format' to change this
+header."
+  nil)
+
+(defun magit-log-get-buffer-args ()
+  (cond ((and magit-use-sticky-arguments
+              (derived-mode-p 'magit-log-mode))
+         (list (nth 1 magit-refresh-args)
+               (nth 2 magit-refresh-args)))
+        ((and (eq magit-use-sticky-arguments t)
+              (--when-let (magit-mode-get-buffer 'magit-log-mode)
+                (with-current-buffer it
+                  (list (nth 1 magit-refresh-args)
+                        (nth 2 magit-refresh-args))))))
+        (t
+         (list (default-value 'magit-log-arguments) nil))))
+
+(defun magit-log-arguments (&optional refresh)
+  (cond ((memq magit-current-popup
+               '(magit-log-popup magit-log-refresh-popup))
+         (magit-popup-export-file-args magit-current-popup-args))
+        ((and refresh (not (derived-mode-p 'magit-log-mode)))
+         (list magit-log-section-arguments nil))
+        (t
+         (magit-log-get-buffer-args))))
+
+(defun magit-log-popup (arg)
+  "Popup console for log commands."
+  (interactive "P")
+  (let ((magit-log-refresh-popup
+         (pcase major-mode
+           (`magit-log-mode magit-log-mode-refresh-popup)
+           (_               magit-log-refresh-popup)))
+        (magit-log-arguments
+         (apply #'magit-popup-import-file-args (magit-log-get-buffer-args))))
+    (magit-invoke-popup 'magit-log-popup nil arg)))
+
+;;;###autoload
+(defun magit-log-buffer-file-popup ()
+  "Popup console for log commands.
+
+This is a variant of `magit-log-popup' which shows the same popup
+but which limits the log to the file being visited in the current
+buffer."
+  (interactive)
+  (if-let ((file (magit-file-relative-name)))
+      (let ((magit-log-arguments
+             (magit-popup-import-file-args
+              (if-let ((buffer (magit-mode-get-buffer 'magit-log-mode)))
+                  (with-current-buffer buffer
+                    (nth 2 magit-refresh-args))
+                (default-value 'magit-log-arguments))
+              (list file))))
+        (magit-invoke-popup 'magit-log-popup nil nil))
+    (user-error "Buffer isn't visiting a file")))
+
+(defun magit-log-refresh-popup (arg)
+  "Popup console for changing log arguments in the current buffer."
+  (interactive "P")
+  (magit-log-refresh-assert)
+  (let ((magit-log-refresh-popup
+         (cond ((derived-mode-p 'magit-log-select-mode)
+                magit-log-refresh-popup)
+               ((derived-mode-p 'magit-log-mode)
+                (let ((def (copy-sequence magit-log-refresh-popup)))
+                  (plist-put def :switches (plist-get magit-log-popup :switches))
+                  (plist-put def :options  (plist-get magit-log-popup :options))
+                  def))
+               (t
+                magit-log-refresh-popup)))
+        (magit-log-arguments
+         (cond ((derived-mode-p 'magit-log-select-mode)
+                (cadr magit-refresh-args))
+               ((derived-mode-p 'magit-log-mode)
+                (magit-popup-import-file-args (nth 1 magit-refresh-args)
+                                              (nth 2 magit-refresh-args)))
+               (t
+                magit-log-section-arguments))))
+    (magit-invoke-popup 'magit-log-refresh-popup nil arg)))
+
+;;;; Refresh Commands
+
+(defun magit-log-refresh (args files)
+  "Set the local log arguments for the current buffer."
+  (interactive (magit-log-arguments t))
+  (magit-log-refresh-assert)
+  (cond ((derived-mode-p 'magit-log-select-mode)
+         (setcar (cdr magit-refresh-args) args))
+        ((derived-mode-p 'magit-log-mode)
+         (setcdr magit-refresh-args (list args files)))
+        (t
+         (setq-local magit-log-section-arguments args)))
+  (magit-refresh))
+
+(defun magit-log-set-default-arguments (args files)
+  "Set the global log arguments for the current buffer."
+  (interactive (magit-log-arguments t))
+  (magit-log-refresh-assert)
+  (cond ((derived-mode-p 'magit-log-select-mode)
+         (customize-set-variable 'magit-log-select-arguments args)
+         (setcar (cdr magit-refresh-args) args))
+        ((derived-mode-p 'magit-log-mode)
+         (customize-set-variable 'magit-log-arguments args)
+         (setcdr magit-refresh-args (list args files)))
+        (t
+         (customize-set-variable 'magit-log-section-arguments args)
+         (kill-local-variable    'magit-log-section-arguments)))
+  (magit-refresh))
+
+(defun magit-log-save-default-arguments (args files)
+  "Set and save the global log arguments for the current buffer."
+  (interactive (magit-log-arguments t))
+  (magit-log-refresh-assert)
+  (cond ((derived-mode-p 'magit-log-select-mode)
+         (customize-save-variable 'magit-log-select-arguments args)
+         (setcar (cdr magit-refresh-args) args))
+        ((derived-mode-p 'magit-log-mode)
+         (customize-save-variable 'magit-log-arguments args)
+         (setcdr magit-refresh-args (list args files)))
+        (t
+         (customize-save-variable 'magit-log-section-arguments args)
+         (kill-local-variable     'magit-log-section-arguments)))
+  (magit-refresh))
+
+(defun magit-log-refresh-assert ()
+  (cond ((derived-mode-p 'magit-reflog-mode)
+         (user-error "Cannot change log arguments in reflog buffers"))
+        ((derived-mode-p 'magit-cherry-mode)
+         (user-error "Cannot change log arguments in cherry buffers"))))
+
+;;;; Log Commands
+
+(defvar magit-log-read-revs-map
+  (let ((map (make-sparse-keymap)))
+    (set-keymap-parent map crm-local-completion-map)
+    (define-key map "\s" 'self-insert-command)
+    map))
+
+(defun magit-log-read-revs (&optional use-current)
+  (or (and use-current (--when-let (magit-get-current-branch) (list it)))
+      (let ((collection `(,@(and (file-exists-p (magit-git-dir "FETCH_HEAD"))
+                                 (list "FETCH_HEAD"))
+                          ,@(magit-list-refnames))))
+        (split-string
+         (magit-completing-read-multiple "Log rev,s" collection
+                                         "\\(\\.\\.\\.?\\|[, ]\\)"
+                                         (or (magit-branch-or-commit-at-point)
+                                             (unless use-current
+                                               (magit-get-previous-branch)))
+                                         'magit-revision-history
+                                         magit-log-read-revs-map)
+         "[, ]" t))))
+
+;;;###autoload
+(defun magit-log-current (revs &optional args files)
+  "Show log for the current branch.
+When `HEAD' is detached or with a prefix argument show log for
+one or more revs read from the minibuffer."
+  (interactive (cons (magit-log-read-revs t)
+                     (magit-log-arguments)))
+  (magit-log revs args files))
+
+;;;###autoload
+(defun magit-log (revs &optional args files)
+  "Show log for one or more revs read from the minibuffer.
+The user can input any revision or revisions separated by a
+space, or even ranges, but only branches and tags, and a
+representation of the commit at point, are available as
+completion candidates."
+  (interactive (cons (magit-log-read-revs)
+                     (magit-log-arguments)))
+  (require 'magit)
+  (magit-mode-setup #'magit-log-mode revs args files)
+  (magit-log-goto-same-commit))
+
+;;;###autoload
+(defun magit-log-head (&optional args files)
+  "Show log for `HEAD'."
+  (interactive (magit-log-arguments))
+  (magit-log (list "HEAD") args files))
+
+;;;###autoload
+(defun magit-log-branches (&optional args files)
+  "Show log for all local branches and `HEAD'."
+  (interactive (magit-log-arguments))
+  (magit-log (if (magit-get-current-branch)
+                 (list "--branches")
+               (list "HEAD" "--branches"))
+             args files))
+
+;;;###autoload
+(defun magit-log-all-branches (&optional args files)
+  "Show log for all local and remote branches and `HEAD'."
+  (interactive (magit-log-arguments))
+  (magit-log (if (magit-get-current-branch)
+                 (list "--branches" "--remotes")
+               (list "HEAD" "--branches" "--remotes"))
+             args files))
+
+;;;###autoload
+(defun magit-log-all (&optional args files)
+  "Show log for all references and `HEAD'."
+  (interactive (magit-log-arguments))
+  (magit-log (if (magit-get-current-branch)
+                 (list "--all")
+               (list "HEAD" "--all"))
+             args files))
+
+;;;###autoload
+(defun magit-log-buffer-file (&optional follow beg end)
+  "Show log for the blob or file visited in the current buffer.
+With a prefix argument or when `--follow' is part of
+`magit-log-arguments', then follow renames.  When the region is
+active, restrict the log to the lines that the region touches."
+  (interactive
+   (cons current-prefix-arg
+         (and (region-active-p)
+              (magit-file-relative-name)
+              (save-restriction
+                (widen)
+                (list (line-number-at-pos (region-beginning))
+                      (line-number-at-pos
+                       (let ((end (region-end)))
+                         (if (char-after end)
+                             end
+                           ;; Ensure that we don't get the line number
+                           ;; of a trailing newline.
+                           (1- end)))))))))
+  (require 'magit)
+  (if-let ((file (magit-file-relative-name)))
+      (magit-mode-setup-internal
+       #'magit-log-mode
+       (list (list (or magit-buffer-refname
+                       (magit-get-current-branch)
+                       "HEAD"))
+             (let ((args (car (magit-log-arguments))))
+               (when (and follow (not (member "--follow" args)))
+                 (push "--follow" args))
+               (when (and (file-regular-p
+                           (expand-file-name file (magit-toplevel)))
+                          beg end)
+                 (setq args (cons (format "-L%s,%s:%s" beg end file)
+                                  (cl-delete "-L" args :test
+                                             'string-prefix-p)))
+                 (setq file nil))
+               args)
+             (and file (list file)))
+       magit-log-buffer-file-locked)
+    (user-error "Buffer isn't visiting a file"))
+  (magit-log-goto-same-commit))
+
+;;;###autoload
+(defun magit-log-trace-definition (file fn rev)
+  "Show log for the definition at point."
+  (interactive (list (or (magit-file-relative-name)
+                         (user-error "Buffer isn't visiting a file"))
+                     (which-function)
+                     (or magit-buffer-refname
+                         (magit-get-current-branch)
+                         "HEAD")))
+  (require 'magit)
+  (magit-mode-setup-internal
+   #'magit-log-mode
+   (list (list rev)
+         (cons (format "-L:%s:%s" fn file)
+               (cl-delete "-L" (car (magit-log-arguments))
+                          :test 'string-prefix-p))
+         nil)
+   magit-log-buffer-file-locked)
+  (magit-log-goto-same-commit))
+
+(defun magit-diff-trace-definition ()
+  "Show log for the definition at point in a diff."
+  (interactive)
+  (let (buf pos)
+    (save-window-excursion
+      (call-interactively #'magit-diff-visit-file)
+      (setq buf (current-buffer))
+      (setq pos (point)))
+    (save-excursion
+      (with-current-buffer buf
+        (goto-char pos)
+        (call-interactively #'magit-log-trace-definition)))))
+
+;;;###autoload
+(defun magit-reflog-current ()
+  "Display the reflog of the current branch."
+  (interactive)
+  (magit-reflog (magit-get-current-branch)))
+
+;;;###autoload
+(defun magit-reflog (ref)
+  "Display the reflog of a branch."
+  (interactive (list (magit-read-local-branch-or-ref "Show reflog for")))
+  (require 'magit)
+  (magit-mode-setup #'magit-reflog-mode ref magit-reflog-arguments))
+
+;;;###autoload
+(defun magit-reflog-head ()
+  "Display the `HEAD' reflog."
+  (interactive)
+  (magit-reflog "HEAD"))
+
+;;;; Limit Commands
+
+(defun magit-log-toggle-commit-limit ()
+  "Toggle the number of commits the current log buffer is limited to.
+If the number of commits is currently limited, then remove that
+limit.  Otherwise set it to 256."
+  (interactive)
+  (magit-log-set-commit-limit (lambda (&rest _) nil)))
+
+(defun magit-log-double-commit-limit ()
+  "Double the number of commits the current log buffer is limited to."
+  (interactive)
+  (magit-log-set-commit-limit '*))
+
+(defun magit-log-half-commit-limit ()
+  "Half the number of commits the current log buffer is limited to."
+  (interactive)
+  (magit-log-set-commit-limit '/))
+
+(defun magit-log-set-commit-limit (fn)
+  (let* ((val (car (magit-log-arguments t)))
+         (arg (--first (string-match "^-n\\([0-9]+\\)?$" it) val))
+         (num (and arg (string-to-number (match-string 1 arg))))
+         (num (if num (funcall fn num 2) 256)))
+    (setq val (delete arg val))
+    (setcar (cdr magit-refresh-args)
+            (if (and num (> num 0))
+                (cons (format "-n%i" num) val)
+              val)))
+  (magit-refresh))
+
+(defun magit-log-get-commit-limit ()
+  (--when-let (--first (string-match "^-n\\([0-9]+\\)?$" it)
+                       (car (magit-log-arguments t)))
+    (string-to-number (match-string 1 it))))
+
+;;;; Other Commands
+
+(defun magit-log-bury-buffer (&optional arg)
+  "Bury the current buffer or the revision buffer in the same frame.
+Like `magit-mode-bury-buffer' (which see) but with a negative
+prefix argument instead bury the revision buffer, provided it
+is displayed in the current frame."
+  (interactive "p")
+  (if (< arg 0)
+      (let* ((buf (magit-mode-get-buffer 'magit-revision-mode))
+             (win (and buf (get-buffer-window buf (selected-frame)))))
+        (if win
+            (with-selected-window win
+              (with-current-buffer buf
+                (magit-mode-bury-buffer (> (abs arg) 1))))
+          (user-error "No revision buffer in this frame")))
+    (magit-mode-bury-buffer (> arg 1))))
+
+;;;###autoload
+(defun magit-log-move-to-parent (&optional n)
+  "Move to the Nth parent of the current commit."
+  (interactive "p")
+  (when (derived-mode-p 'magit-log-mode)
+    (magit-section-when commit
+      (let ((parent-rev (format "%s^%s" (oref it value) (or n 1))))
+        (if-let ((parent-hash (magit-rev-parse "--short" parent-rev)))
+            (if-let ((section (--first (equal (oref it value)
+                                              parent-hash)
+                                       (magit-section-siblings it 'next))))
+                (magit-section-goto section)
+              (user-error
+               (substitute-command-keys
+                (concat "Parent " parent-hash " not found.  Try typing "
+                        "\\[magit-log-double-commit-limit] first"))))
+          (user-error "Parent %s does not exist" parent-rev))))))
+
+;;; Log Mode
+
+(defvar magit-log-mode-map
+  (let ((map (make-sparse-keymap)))
+    (set-keymap-parent map magit-mode-map)
+    (define-key map "\C-c\C-b" 'magit-go-backward)
+    (define-key map "\C-c\C-f" 'magit-go-forward)
+    (define-key map "\C-c\C-n" 'magit-log-move-to-parent)
+    (define-key map "=" 'magit-log-toggle-commit-limit)
+    (define-key map "+" 'magit-log-double-commit-limit)
+    (define-key map "-" 'magit-log-half-commit-limit)
+    (define-key map "q" 'magit-log-bury-buffer)
+    map)
+  "Keymap for `magit-log-mode'.")
+
+(define-derived-mode magit-log-mode magit-mode "Magit Log"
+  "Mode for looking at Git log.
+
+This mode is documented in info node `(magit)Log Buffer'.
+
+\\<magit-mode-map>\
+Type \\[magit-refresh] to refresh the current buffer.
+Type \\[magit-visit-thing] or \\[magit-diff-show-or-scroll-up] \
+to visit the commit at point.
+
+Type \\[magit-branch-popup] to see available branch commands.
+Type \\[magit-merge-popup] to merge the branch or commit at point.
+Type \\[magit-cherry-pick-popup] to apply the commit at point.
+Type \\[magit-reset] to reset `HEAD' to the commit at point.
+
+\\{magit-log-mode-map}"
+  :group 'magit-log
+  (hack-dir-local-variables-non-file-buffer)
+  (setq imenu-prev-index-position-function
+        'magit-imenu--log-prev-index-position-function)
+  (setq imenu-extract-index-name-function
+        'magit-imenu--log-extract-index-name-function)
+  (setq-local bookmark-make-record-function
+              'magit-bookmark--log-make-record))
+
+(defvar magit-log-disable-graph-hack-args
+  '("-G" "--grep" "--author")
+  "Arguments which disable the graph speedup hack.")
+
+(defun magit-log-refresh-buffer (revs args files)
+  (magit-set-header-line-format
+   (funcall magit-log-header-line-function revs args files))
+  (if (= (length files) 1)
+      (unless (magit-file-tracked-p (car files))
+        (setq args (cons "--full-history" args)))
+    (setq args (remove "--follow" args)))
+  (when (--any-p (string-match-p
+                  (concat "^" (regexp-opt magit-log-remove-graph-args)) it)
+                 args)
+    (setq args (remove "--graph" args)))
+  (unless (member "--graph" args)
+    (setq args (remove "--color" args)))
+  (when-let ((limit (magit-log-get-commit-limit))
+             (limit (* 2 limit)) ; increase odds for complete graph
+             (count (and (= (length revs) 1)
+                         (> limit 1024) ; otherwise it's fast enough
+                         (setq revs (car revs))
+                         (not (string-match-p "\\.\\." revs))
+                         (not (member revs '("--all" "--branches")))
+                         (-none-p (lambda (arg)
+                                    (--any-p (string-prefix-p it arg)
+                                             magit-log-disable-graph-hack-args))
+                                  args)
+                         (magit-git-string "rev-list" "--count"
+                                           "--first-parent" args revs))))
+    (setq revs (if (< (string-to-number count) limit)
+                   revs
+                 (format "%s~%s..%s" revs limit revs))))
+  (magit-insert-section (logbuf)
+    (magit-insert-log revs args files)))
+
+(defun magit-log-header-line-arguments (revs args files)
+  "Return string describing some of the used arguments."
+  (mapconcat (lambda (arg)
+               (if (string-match-p " " arg)
+                   (prin1 arg)
+                 arg))
+             `("git" "log" ,@args ,@revs "--" ,@files)
+             " "))
+
+(defun magit-log-header-line-sentence (revs args files)
+  "Return string containing all arguments."
+  (concat "Commits in "
+          (mapconcat #'identity revs " ")
+          (and (member "--reverse" args)
+               " in reverse")
+          (and files (concat " touching "
+                             (mapconcat 'identity files " ")))
+          (--some (and (string-prefix-p "-L" it)
+                       (concat " " it))
+                  args)))
+
+(defun magit-insert-log (revs &optional args files)
+  "Insert a log section.
+Do not add this to a hook variable."
+  (let ((magit-git-global-arguments
+         (remove "--literal-pathspecs" magit-git-global-arguments)))
+    (magit-git-wash (apply-partially #'magit-log-wash-log 'log)
+      "log"
+      (format "--format=%%h%s%%x00%s%%x00%%aN%%x00%%at%%x00%%s%s"
+              (if (member "--decorate" args) "%d" "")
+              (if (member "--show-signature" args)
+                  (progn (setq args (remove "--show-signature" args)) "%G?")
+                "")
+              (if (member "++header" args)
+                  (if (member "--graph" (setq args (remove "++header" args)))
+                      (concat "\n" magit-log-revision-headers-format "\n")
+                    (concat "\n" magit-log-revision-headers-format "\n"))
+                ""))
+      (progn
+        (--when-let (--first (string-match "^\\+\\+order=\\(.+\\)$" it) args)
+          (setq args (cons (format "--%s-order" (match-string 1 it))
+                           (remove it args))))
+        (when (member "--decorate" args)
+          (setq args (cons "--decorate=full" (remove "--decorate" args))))
+        (when (member "--reverse" args)
+          (setq args (remove "--graph" args)))
+        args)
+      "--use-mailmap" "--no-prefix" revs "--" files)))
+
+(defvar magit-commit-section-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map [remap magit-visit-thing] 'magit-show-commit)
+    (define-key map "a" 'magit-cherry-apply)
+    map)
+  "Keymap for `commit' sections.")
+
+(defvar magit-module-commit-section-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map [remap magit-visit-thing] 'magit-show-commit)
+    map)
+  "Keymap for `module-commit' sections.")
+
+(defconst magit-log-heading-re
+  (concat "^"
+          "\\(?4:[-_/|\\*o. ]*\\)"                 ; graph
+          "\\(?1:[0-9a-fA-F]+\\)"                  ; sha1
+          "\\(?3:[^\0\n]+)\\)?\0"                  ; refs
+          "\\(?7:[BGUXYREN]\\)?\0"                 ; gpg
+          "\\(?5:[^\0\n]*\\)\0"                    ; author
+          "\\(?6:[^\0\n]+\\)\0"                    ; date
+          "\\(?2:.*\\)$"))                         ; msg
+
+(defconst magit-log-cherry-re
+  (concat "^"
+          "\\(?8:[-+]\\) "                         ; cherry
+          "\\(?1:[0-9a-fA-F]+\\) "                 ; sha1
+          "\\(?2:.*\\)$"))                         ; msg
+
+(defconst magit-log-module-re
+  (concat "^"
+          "\\(?:\\(?11:[<>]\\) \\)?"               ; side
+          "\\(?1:[0-9a-fA-F]+\\) "                 ; sha1
+          "\\(?2:.*\\)$"))                         ; msg
+
+(defconst magit-log-bisect-vis-re
+  (concat "^"
+          "\\(?4:[-_/|\\*o. ]*\\)"                 ; graph
+          "\\(?1:[0-9a-fA-F]+\\)"                  ; sha1
+          "\\(?3:[^\0\n]+)\\)?\0"                  ; refs
+          "\\(?2:.*\\)$"))                         ; msg
+
+(defconst magit-log-bisect-log-re
+  (concat "^# "
+          "\\(?3:bad:\\|skip:\\|good:\\) "         ; "refs"
+          "\\[\\(?1:[^]\n]+\\)\\] "                ; sha1
+          "\\(?2:.*\\)$"))                         ; msg
+
+(defconst magit-log-reflog-re
+  (concat "^"
+          "\\(?1:[^\0\n]+\\)\0"                    ; sha1
+          "\\(?5:[^\0\n]*\\)\0"                    ; author
+          "\\(?:\\(?:[^@\n]+@{\\(?6:[^}\n]+\\)}\0" ; date
+          "\\(?10:merge \\|autosave \\|restart \\|[^:\n]+: \\)?" ; refsub
+          "\\(?2:.*\\)?\\)\\|\0\\)$"))             ; msg
+
+(defconst magit-reflog-subject-re
+  (concat "\\(?1:[^ ]+\\) ?"                       ; command
+          "\\(?2:\\(?: ?-[^ ]+\\)+\\)?"            ; option
+          "\\(?: ?(\\(?3:[^)]+\\))\\)?"))          ; type
+
+(defconst magit-log-stash-re
+  (concat "^"
+          "\\(?1:[^\0\n]+\\)\0"                    ; "sha1"
+          "\\(?5:[^\0\n]*\\)\0"                    ; author
+          "\\(?6:[^\0\n]+\\)\0"                    ; date
+          "\\(?2:.*\\)$"))                         ; msg
+
+(defvar magit-log-count nil)
+
+(defvar magit-log-format-message-function 'magit-log-propertize-keywords)
+
+(defun magit-log-wash-log (style args)
+  (setq args (-flatten args))
+  (when (and (member "--graph" args)
+             (member "--color" args))
+    (let ((ansi-color-apply-face-function
+           (lambda (beg end face)
+             (put-text-property beg end 'font-lock-face
+                                (or face 'magit-log-graph)))))
+      (ansi-color-apply-on-region (point-min) (point-max))))
+  (when (eq style 'cherry)
+    (reverse-region (point-min) (point-max)))
+  (let ((magit-log-count 0))
+    (magit-wash-sequence (apply-partially 'magit-log-wash-rev style
+                                          (magit-abbrev-length)))
+    (if (derived-mode-p 'magit-log-mode)
+        (when (eq magit-log-count (magit-log-get-commit-limit))
+          (magit-insert-section (longer)
+            (insert-text-button
+             (substitute-command-keys
+              (format "Type \\<%s>\\[%s] to show more history"
+                      'magit-log-mode-map
+                      'magit-log-double-commit-limit))
+             'action (lambda (_button)
+                       (magit-log-double-commit-limit))
+             'follow-link t
+             'mouse-face 'magit-section-highlight)))
+      (insert ?\n))))
+
+(cl-defun magit-log-wash-rev (style abbrev)
+  (when (derived-mode-p 'magit-log-mode)
+    (cl-incf magit-log-count))
+  (looking-at (pcase style
+                (`log        magit-log-heading-re)
+                (`cherry     magit-log-cherry-re)
+                (`module     magit-log-module-re)
+                (`reflog     magit-log-reflog-re)
+                (`stash      magit-log-stash-re)
+                (`bisect-vis magit-log-bisect-vis-re)
+                (`bisect-log magit-log-bisect-log-re)))
+  (magit-bind-match-strings
+      (hash msg refs graph author date gpg cherry _ refsub side) nil
+    (setq msg (substring-no-properties msg))
+    (when refs
+      (setq refs (substring-no-properties refs)))
+    (let ((align (or (eq style 'cherry)
+                     (not (member "--stat" (cadr magit-refresh-args)))))
+          (non-graph-re (if (eq style 'bisect-vis)
+                            magit-log-bisect-vis-re
+                          magit-log-heading-re)))
+      (magit-delete-line)
+      ;; If the reflog entries have been pruned, the output of `git
+      ;; reflog show' includes a partial line that refers to the hash
+      ;; of the youngest expired reflog entry.
+      (when (and (eq style 'reflog) (not date))
+        (cl-return-from magit-log-wash-rev t))
+      (magit-insert-section section (commit hash)
+        (pcase style
+          (`stash      (oset section type 'stash))
+          (`module     (oset section type 'module-commit))
+          (`bisect-log (setq hash (magit-rev-parse "--short" hash))))
+        (when cherry
+          (when (and (derived-mode-p 'magit-refs-mode)
+                     magit-refs-show-commit-count)
+            (insert (make-string (1- magit-refs-focus-column-width) ?\s)))
+          (insert (propertize cherry 'face (if (string= cherry "-")
+                                               'magit-cherry-equivalent
+                                             'magit-cherry-unmatched)))
+          (insert ?\s))
+        (when side
+          (insert (propertize side 'face (if (string= side "<")
+                                             'magit-cherry-equivalent
+                                           'magit-cherry-unmatched)))
+          (insert ?\s))
+        (when align
+          (insert (propertize hash 'face 'magit-hash) ?\s))
+        (when graph
+          (insert graph))
+        (unless align
+          (insert (propertize hash 'face 'magit-hash) ?\s))
+        (when (and refs (not magit-log-show-refname-after-summary))
+          (insert (magit-format-ref-labels refs) ?\s))
+        (when (eq style 'reflog)
+          (insert (format "%-2s " (1- magit-log-count)))
+          (when refsub
+            (insert (magit-reflog-format-subject
+                     (substring refsub 0 (if (string-match-p ":" refsub) -2 -1))))))
+        (when msg
+          (when gpg
+            (setq msg (propertize msg 'face
+                                  (pcase (aref gpg 0)
+                                    (?G 'magit-signature-good)
+                                    (?B 'magit-signature-bad)
+                                    (?U 'magit-signature-untrusted)
+                                    (?X 'magit-signature-expired)
+                                    (?Y 'magit-signature-expired-key)
+                                    (?R 'magit-signature-revoked)
+                                    (?E 'magit-signature-error)))))
+          (insert (funcall magit-log-format-message-function hash msg)))
+        (when (and refs magit-log-show-refname-after-summary)
+          (insert ?\s)
+          (insert (magit-format-ref-labels refs)))
+        (insert ?\n)
+        (when (memq style '(log reflog stash))
+          (goto-char (line-beginning-position))
+          (when (and refsub
+                     (string-match "\\`\\([^ ]\\) \\+\\(..\\)\\(..\\)" date))
+            (setq date (+ (string-to-number (match-string 1 date))
+                          (* (string-to-number (match-string 2 date)) 60 60)
+                          (* (string-to-number (match-string 3 date)) 60))))
+          (save-excursion
+            (backward-char)
+            (magit-log-format-margin author date)))
+        (when (and (eq style 'cherry)
+                   (magit-buffer-margin-p))
+          (save-excursion
+            (backward-char)
+            (apply #'magit-log-format-margin
+                   (split-string (magit-rev-format "%aN%x00%ct" hash) "\0"))))
+        (when (and graph
+                   (not (eobp))
+                   (not (looking-at non-graph-re)))
+          (when (looking-at "")
+            (magit-insert-heading)
+            (delete-char 1)
+            (magit-insert-section (commit-header)
+              (forward-line)
+              (magit-insert-heading)
+              (re-search-forward "")
+              (backward-delete-char 1)
+              (forward-char)
+              (insert ?\n))
+            (delete-char 1))
+          (if (looking-at "^\\(---\\|\n\s\\|\ndiff\\)")
+              (let ((limit (save-excursion
+                             (and (re-search-forward non-graph-re nil t)
+                                  (match-beginning 0)))))
+                (unless (oref magit-insert-section--current content)
+                  (magit-insert-heading))
+                (delete-char (if (looking-at "\n") 1 4))
+                (magit-diff-wash-diffs (list "--stat") limit))
+            (when align
+              (setq align (make-string (1+ abbrev) ? )))
+            (when (and (not (eobp)) (not (looking-at non-graph-re)))
+              (when align
+                (setq align (make-string (1+ abbrev) ? )))
+              (while (and (not (eobp)) (not (looking-at non-graph-re)))
+                (when align
+                  (save-excursion (insert align)))
+                (magit-make-margin-overlay)
+                (forward-line))
+              ;; When `--format' is used and its value isn't one of the
+              ;; predefined formats, then `git-log' does not insert a
+              ;; separator line.
+              (save-excursion
+                (forward-line -1)
+                (looking-at "[-_/|\\*o. ]*"))
+              (setq graph (match-string 0))
+              (unless (string-match-p "[/\\]" graph)
+                (insert graph ?\n))))))))
+  t)
+
+(defun magit-log-propertize-keywords (_rev msg)
+  (let ((start 0))
+    (when (string-match "^\\(squash\\|fixup\\)! " msg start)
+      (setq start (match-end 0))
+      (put-text-property (match-beginning 0)
+                         (match-end 0)
+                         'face 'magit-keyword-squash msg))
+    (while (string-match "\\[[^[]*\\]" msg start)
+      (setq start (match-end 0))
+      (when magit-log-highlight-keywords
+        (put-text-property (match-beginning 0)
+                           (match-end 0)
+                           'face 'magit-keyword msg))))
+  msg)
+
+(defun magit-log-maybe-show-more-commits (section)
+  "When point is at the end of a log buffer, insert more commits.
+
+Log buffers end with a button \"Type + to show more history\".
+When the use of a section movement command puts point on that
+button, then automatically show more commits, without the user
+having to press \"+\".
+
+This function is called by `magit-section-movement-hook' and
+exists mostly for backward compatibility reasons."
+  (when (and (eq (oref section type) 'longer)
+             magit-log-auto-more)
+    (magit-log-double-commit-limit)
+    (forward-line -1)
+    (magit-section-forward)))
+
+(defvar magit--update-revision-buffer nil)
+
+(defun magit-log-maybe-update-revision-buffer (&optional _)
+  "When moving in the log buffer, update the revision buffer.
+If there is no revision buffer in the same frame, then do nothing."
+  (when (derived-mode-p 'magit-log-mode)
+    (magit-log-maybe-update-revision-buffer-1)))
+
+(defun magit-log-maybe-update-revision-buffer-1 ()
+  (unless magit--update-revision-buffer
+    (when-let ((commit (magit-section-when 'commit))
+               (buffer (magit-mode-get-buffer 'magit-revision-mode nil t)))
+      (setq magit--update-revision-buffer (list commit buffer))
+      (run-with-idle-timer
+       magit-update-other-window-delay nil
+       (let ((args (magit-show-commit--arguments)))
+         (lambda ()
+           (pcase-let ((`(,rev ,buf) magit--update-revision-buffer))
+             (setq magit--update-revision-buffer nil)
+             (when (buffer-live-p buf)
+               (let ((magit-display-buffer-noselect t))
+                 (apply #'magit-show-commit rev args))))
+           (setq magit--update-revision-buffer nil)))))))
+
+(defvar magit--update-blob-buffer nil)
+
+(defun magit-log-maybe-update-blob-buffer (&optional _)
+  "When moving in the log buffer, update the blob buffer.
+If there is no blob buffer in the same frame, then do nothing."
+  (when (derived-mode-p 'magit-log-mode)
+    (magit-log-maybe-update-blob-buffer-1)))
+
+(defun magit-log-maybe-update-blob-buffer-1 ()
+  (unless magit--update-revision-buffer
+    (when-let ((commit (magit-section-when 'commit))
+               (buffer (--first (with-current-buffer it magit-buffer-revision)
+                                (mapcar #'window-buffer (window-list)))))
+        (setq magit--update-blob-buffer (list commit buffer))
+        (run-with-idle-timer
+         magit-update-other-window-delay nil
+         (lambda ()
+           (pcase-let ((`(,rev ,buf) magit--update-blob-buffer))
+             (setq magit--update-blob-buffer nil)
+             (when (buffer-live-p buf)
+               (save-excursion
+                 (with-selected-window (get-buffer-window buf)
+                   (with-current-buffer buf
+                     (magit-blob-visit (list (magit-rev-parse rev)
+                                             (magit-file-relative-name
+                                              magit-buffer-file-name))
+                                       (line-number-at-pos))))))))))))
+
+(defun magit-log-goto-same-commit ()
+  (when-let ((prev magit-previous-section)
+             (rev  (cond ((magit-section-match 'commit prev)
+                          (oref prev value))
+                         ((magit-section-match 'branch prev)
+                          (magit-rev-format "%h" (oref prev value)))))
+             (same (--first (equal (oref it value) rev)
+                            (oref magit-root-section children))))
+    (goto-char (oref same start))))
+
+;;; Log Margin
+
+(defun magit-log-format-margin (author date)
+  (when-let ((option (magit-margin-option)))
+    (pcase-let ((`(,_ ,style ,width ,details ,details-width)
+                 (or magit-buffer-margin
+                     (symbol-value option))))
+      (magit-make-margin-overlay
+       (concat (and details
+                    (concat (propertize (truncate-string-to-width
+                                         (or author "")
+                                         details-width
+                                         nil ?\s (make-string 1 magit-ellipsis))
+                                        'face 'magit-log-author)
+                            " "))
+               (propertize
+                (if (stringp style)
+                    (format-time-string
+                     style
+                     (seconds-to-time (string-to-number date)))
+                  (pcase-let* ((abbr (eq style 'age-abbreviated))
+                               (`(,cnt ,unit) (magit--age date abbr)))
+                    (format (format (if abbr "%%2i%%-%ic" "%%2i %%-%is")
+                                    (- width (if details (1+ details-width) 0)))
+                            cnt unit)))
+                'face 'magit-log-date))))))
+
+(defun magit-log-margin-width (style details details-width)
+  (+ (if details (1+ details-width) 0)
+     (if (stringp style)
+         (length (format-time-string style))
+       (+ 2 ; two digits
+          1 ; trailing space
+          (if (eq style 'age-abbreviated)
+              1  ; single character
+            (+ 1 ; gap after digits
+               (apply #'max (--map (max (length (nth 1 it))
+                                        (length (nth 2 it)))
+                                   magit--age-spec))))))))
+
+;;; Select Mode
+
+(defvar magit-log-select-mode-map
+  (let ((map (make-sparse-keymap)))
+    (set-keymap-parent map magit-log-mode-map)
+    (define-key map "\C-c\C-b" 'undefined)
+    (define-key map "\C-c\C-f" 'undefined)
+    (define-key map "."        'magit-log-select-pick)
+    (define-key map "e"        'magit-log-select-pick)
+    (define-key map "\C-c\C-c" 'magit-log-select-pick)
+    (define-key map "q"        'magit-log-select-quit)
+    (define-key map "\C-c\C-k" 'magit-log-select-quit)
+    map)
+  "Keymap for `magit-log-select-mode'.")
+
+(put 'magit-log-select-pick :advertised-binding [?\C-c ?\C-c])
+(put 'magit-log-select-quit :advertised-binding [?\C-c ?\C-k])
+
+(define-derived-mode magit-log-select-mode magit-log-mode "Magit Select"
+  "Mode for selecting a commit from history.
+
+This mode is documented in info node `(magit)Select from Log'.
+
+\\<magit-mode-map>\
+Type \\[magit-refresh] to refresh the current buffer.
+Type \\[magit-visit-thing] or \\[magit-diff-show-or-scroll-up] \
+to visit the commit at point.
+
+\\<magit-log-select-mode-map>\
+Type \\[magit-log-select-pick] to select the commit at point.
+Type \\[magit-log-select-quit] to abort without selecting a commit."
+  :group 'magit-log
+  (hack-dir-local-variables-non-file-buffer))
+
+(defun magit-log-select-refresh-buffer (rev args)
+  (magit-insert-section (logbuf)
+    (magit-insert-log rev args)))
+
+(defvar-local magit-log-select-pick-function nil)
+(defvar-local magit-log-select-quit-function nil)
+
+(defun magit-log-select (pick &optional msg quit branch args)
+  (declare (indent defun))
+  (magit-mode-setup #'magit-log-select-mode
+                    (or branch (magit-get-current-branch) "HEAD")
+                    (append args magit-log-select-arguments))
+  (magit-log-goto-same-commit)
+  (setq magit-log-select-pick-function pick)
+  (setq magit-log-select-quit-function quit)
+  (when magit-log-select-show-usage
+    (let ((pick (propertize (substitute-command-keys
+                             "\\[magit-log-select-pick]")
+                            'face
+                            'magit-header-line-key))
+          (quit (propertize (substitute-command-keys
+                             "\\[magit-log-select-quit]")
+                            'face
+                            'magit-header-line-key)))
+      (setq msg (format-spec
+                 (if msg
+                     (if (string-suffix-p "," msg)
+                         (concat msg " or %q to abort")
+                       msg)
+                   "Type %p to select commit at point, or %q to abort")
+                 `((?p . ,pick)
+                   (?q . ,quit)))))
+    (add-face-text-property 0 (length msg) 'magit-header-line-log-select t msg)
+    (when (memq magit-log-select-show-usage '(both header-line))
+      (magit-set-header-line-format msg))
+    (when (memq magit-log-select-show-usage '(both echo-area))
+      (message "%s" (substring-no-properties msg)))))
+
+(defun magit-log-select-pick ()
+  "Select the commit at point and act on it.
+Call `magit-log-select-pick-function' with the selected
+commit as argument."
+  (interactive)
+  (let ((fun magit-log-select-pick-function)
+        (rev (magit-commit-at-point)))
+    (magit-mode-bury-buffer 'kill)
+    (funcall fun rev)))
+
+(defun magit-log-select-quit ()
+  "Abort selecting a commit, don't act on any commit."
+  (interactive)
+  (magit-mode-bury-buffer 'kill)
+  (when magit-log-select-quit-function
+    (funcall magit-log-select-quit-function)))
+
+;;; Cherry Mode
+
+(defvar magit-cherry-mode-map
+  (let ((map (make-sparse-keymap)))
+    (set-keymap-parent map magit-mode-map)
+    (define-key map "q" 'magit-log-bury-buffer)
+    (define-key map "L" 'magit-margin-popup)
+    map)
+  "Keymap for `magit-cherry-mode'.")
+
+(define-derived-mode magit-cherry-mode magit-mode "Magit Cherry"
+  "Mode for looking at commits not merged upstream.
+
+\\<magit-mode-map>\
+Type \\[magit-refresh] to refresh the current buffer.
+Type \\[magit-visit-thing] or \\[magit-diff-show-or-scroll-up] \
+to visit the commit at point.
+
+Type \\[magit-cherry-pick-popup] to apply the commit at point.
+
+\\{magit-cherry-mode-map}"
+  :group 'magit-log
+  (hack-dir-local-variables-non-file-buffer)
+  (setq imenu-create-index-function
+        'magit-imenu--cherry-create-index-function)
+  (setq-local bookmark-make-record-function
+              'magit-bookmark--cherry-make-record))
+
+;;;###autoload
+(defun magit-cherry (head upstream)
+  "Show commits in a branch that are not merged in the upstream branch."
+  (interactive
+   (let  ((head (magit-read-branch "Cherry head")))
+     (list head (magit-read-other-branch "Cherry upstream" head
+                                         (magit-get-upstream-branch head)))))
+  (require 'magit)
+  (magit-mode-setup #'magit-cherry-mode upstream head))
+
+(defun magit-cherry-refresh-buffer (_upstream _head)
+  (magit-insert-section (cherry)
+    (run-hooks 'magit-cherry-sections-hook)))
+
+(defun magit-insert-cherry-headers ()
+  "Insert headers appropriate for `magit-cherry-mode' buffers."
+  (magit-insert-head-branch-header (nth 1 magit-refresh-args))
+  (magit-insert-upstream-branch-header (nth 1 magit-refresh-args)
+                                       (nth 0 magit-refresh-args)
+                                       "Upstream: ")
+  (insert ?\n))
+
+(defun magit-insert-cherry-commits ()
+  "Insert commit sections into a `magit-cherry-mode' buffer."
+  (magit-insert-section (cherries)
+    (magit-insert-heading "Cherry commits:")
+    (magit-git-wash (apply-partially 'magit-log-wash-log 'cherry)
+      "cherry" "-v" "--abbrev" magit-refresh-args)))
+
+;;; Reflog Mode
+
+(defvar magit-reflog-mode-map
+  (let ((map (make-sparse-keymap)))
+    (set-keymap-parent map magit-log-mode-map)
+    (define-key map "L" 'magit-margin-popup)
+    map)
+  "Keymap for `magit-reflog-mode'.")
+
+(define-derived-mode magit-reflog-mode magit-log-mode "Magit Reflog"
+  "Mode for looking at Git reflog.
+
+This mode is documented in info node `(magit)Reflog'.
+
+\\<magit-mode-map>\
+Type \\[magit-refresh] to refresh the current buffer.
+Type \\[magit-visit-thing] or \\[magit-diff-show-or-scroll-up] \
+to visit the commit at point.
+
+Type \\[magit-cherry-pick-popup] to apply the commit at point.
+Type \\[magit-reset] to reset `HEAD' to the commit at point.
+
+\\{magit-reflog-mode-map}"
+  :group 'magit-log
+  (hack-dir-local-variables-non-file-buffer)
+  (setq-local bookmark-make-record-function
+              'magit-bookmark--reflog-make-record))
+
+(defun magit-reflog-refresh-buffer (ref args)
+  (magit-set-header-line-format (concat "Reflog for " ref))
+  (magit-insert-section (reflogbuf)
+    (magit-git-wash (apply-partially 'magit-log-wash-log 'reflog)
+      "reflog" "show" "--format=%h%x00%aN%x00%gd%x00%gs" "--date=raw"
+      args ref "--")))
+
+(defvar magit-reflog-labels
+  '(("commit"      . magit-reflog-commit)
+    ("amend"       . magit-reflog-amend)
+    ("merge"       . magit-reflog-merge)
+    ("checkout"    . magit-reflog-checkout)
+    ("branch"      . magit-reflog-checkout)
+    ("reset"       . magit-reflog-reset)
+    ("rebase"      . magit-reflog-rebase)
+    ("cherry-pick" . magit-reflog-cherry-pick)
+    ("initial"     . magit-reflog-commit)
+    ("pull"        . magit-reflog-remote)
+    ("clone"       . magit-reflog-remote)
+    ("autosave"    . magit-reflog-commit)
+    ("restart"     . magit-reflog-reset)))
+
+(defun magit-reflog-format-subject (subject)
+  (let* ((match (string-match magit-reflog-subject-re subject))
+         (command (and match (match-string 1 subject)))
+         (option  (and match (match-string 2 subject)))
+         (type    (and match (match-string 3 subject)))
+         (label (if (string= command "commit")
+                    (or type command)
+                  command))
+         (text (if (string= command "commit")
+                   label
+                 (mapconcat #'identity
+                            (delq nil (list command option type))
+                            " "))))
+    (format "%-16s "
+            (propertize text 'face
+                        (or (cdr (assoc label magit-reflog-labels))
+                            'magit-reflog-other)))))
+
+;;; Log Sections
+;;;; Standard Log Sections
+
+(defvar magit-unpulled-section-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map [remap magit-visit-thing] 'magit-diff-dwim)
+    map)
+  "Keymap for `unpulled' sections.")
+
+(magit-define-section-jumper magit-jump-to-unpulled-from-upstream
+  "Unpulled from @{upstream}" unpulled "..@{upstream}")
+
+(defun magit-insert-unpulled-from-upstream ()
+  "Insert commits that haven't been pulled from the upstream yet."
+  (when (magit-git-success "rev-parse" "@{upstream}")
+    (magit-insert-section (unpulled "..@{upstream}" t)
+      (magit-insert-heading
+        (format (propertize "Unpulled from %s:" 'face 'magit-section-heading)
+                (magit-get-upstream-branch)))
+      (magit-insert-log "..@{upstream}" magit-log-section-arguments))))
+
+(magit-define-section-jumper magit-jump-to-unpulled-from-pushremote
+  "Unpulled from <push-remote>" unpulled
+  (concat ".." (magit-get-push-branch)))
+
+(defun magit-insert-unpulled-from-pushremote ()
+  "Insert commits that haven't been pulled from the push-remote yet."
+  (--when-let (magit-get-push-branch)
+    (unless (and (equal (magit-rev-name it)
+                        (magit-rev-name "@{upstream}"))
+                 (or (memq 'magit-insert-unpulled-from-upstream
+                           magit-status-sections-hook)
+                     (memq 'magit-insert-unpulled-from-upstream-or-recent
+                           magit-status-sections-hook)))
+      (magit-insert-section (unpulled (concat ".." it) t)
+        (magit-insert-heading
+          (format (propertize "Unpulled from %s:" 'face 'magit-section-heading)
+                  (propertize it 'face 'magit-branch-remote)))
+        (magit-insert-log (concat ".." it) magit-log-section-arguments)))))
+
+(defvar magit-unpushed-section-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map [remap magit-visit-thing] 'magit-diff-dwim)
+    map)
+  "Keymap for `unpushed' sections.")
+
+(magit-define-section-jumper magit-jump-to-unpushed-to-upstream
+  "Unpushed to @{upstream}" unpushed "@{upstream}..")
+
+(defun magit-insert-unpushed-to-upstream-or-recent ()
+  "Insert section showing unpushed or other recent commits.
+If an upstream is configured for the current branch and it is
+behind of the current branch, then show the commits that have
+not yet been pushed into the upstream branch.  If no upstream is
+configured or if the upstream is not behind of the current branch,
+then show the last `magit-log-section-commit-count' commits."
+  (let ((upstream (magit-rev-parse "@{upstream}")))
+    (if (or (not upstream)
+            (magit-rev-ancestor-p "HEAD" upstream))
+        (magit-insert-recent-commits 'unpushed "@{upstream}..")
+      (magit-insert-unpushed-to-upstream))))
+
+(defun magit-insert-unpushed-to-upstream ()
+  "Insert commits that haven't been pushed to the upstream yet."
+  (when (magit-git-success "rev-parse" "@{upstream}")
+    (magit-insert-section (unpushed "@{upstream}..")
+      (magit-insert-heading
+        (format (propertize "Unmerged into %s:" 'face 'magit-section-heading)
+                (magit-get-upstream-branch)))
+      (magit-insert-log "@{upstream}.." magit-log-section-arguments))))
+
+(defun magit-insert-recent-commits (&optional type value)
+  "Insert section showing recent commits.
+Show the last `magit-log-section-commit-count' commits."
+  (let* ((start (format "HEAD~%s" magit-log-section-commit-count))
+         (range (and (magit-rev-verify start)
+                     (concat start "..HEAD"))))
+    (magit-insert-section ((eval (or type 'recent))
+                           (or value range)
+                           t)
+      (magit-insert-heading "Recent commits")
+      (magit-insert-log range
+                        (cons (format "-n%d" magit-log-section-commit-count)
+                              (--remove (string-prefix-p "-n" it)
+                                        magit-log-section-arguments))))))
+
+(magit-define-section-jumper magit-jump-to-unpushed-to-pushremote
+  "Unpushed to <push-remote>" unpushed
+  (concat (magit-get-push-branch) ".."))
+
+(defun magit-insert-unpushed-to-pushremote ()
+  "Insert commits that haven't been pushed to the push-remote yet."
+  (--when-let (magit-get-push-branch)
+    (unless (and (equal (magit-rev-name it)
+                        (magit-rev-name "@{upstream}"))
+                 (or (memq 'magit-insert-unpushed-to-upstream
+                           magit-status-sections-hook)
+                     (memq 'magit-insert-unpushed-to-upstream-or-recent
+                           magit-status-sections-hook)))
+      (magit-insert-section (unpushed (concat it "..") t)
+        (magit-insert-heading
+          (format (propertize "Unpushed to %s:" 'face 'magit-section-heading)
+                  (propertize it 'face 'magit-branch-remote)))
+        (magit-insert-log (concat it "..") magit-log-section-arguments)))))
+
+;;;; Auxiliary Log Sections
+
+(defun magit-insert-unpulled-cherries ()
+  "Insert section showing unpulled commits.
+Like `magit-insert-unpulled-from-upstream' but prefix each commit
+which has not been applied yet (i.e. a commit with a patch-id
+not shared with any local commit) with \"+\", and all others with
+\"-\"."
+  (when (magit-git-success "rev-parse" "@{upstream}")
+    (magit-insert-section (unpulled "..@{upstream}")
+      (magit-insert-heading "Unpulled commits:")
+      (magit-git-wash (apply-partially 'magit-log-wash-log 'cherry)
+        "cherry" "-v" (magit-abbrev-arg)
+        (magit-get-current-branch) "@{upstream}"))))
+
+(defun magit-insert-unpushed-cherries ()
+  "Insert section showing unpushed commits.
+Like `magit-insert-unpushed-to-upstream' but prefix each commit
+which has not been applied to upstream yet (i.e. a commit with
+a patch-id not shared with any upstream commit) with \"+\", and
+all others with \"-\"."
+  (when (magit-git-success "rev-parse" "@{upstream}")
+    (magit-insert-section (unpushed "@{upstream}..")
+      (magit-insert-heading "Unpushed commits:")
+      (magit-git-wash (apply-partially 'magit-log-wash-log 'cherry)
+        "cherry" "-v" (magit-abbrev-arg) "@{upstream}"))))
+
+(provide 'magit-log)
+;;; magit-log.el ends here