merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

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+gitk(1)
+=======
+
+NAME
+----
+gitk - The Git repository browser
+
+SYNOPSIS
+--------
+[verse]
+'gitk' [<options>] [<revision range>] [--] [<path>...]
+
+DESCRIPTION
+-----------
+Displays changes in a repository or a selected set of commits. This includes
+visualizing the commit graph, showing information related to each commit, and
+the files in the trees of each revision.
+
+OPTIONS
+-------
+
+To control which revisions to show, gitk supports most options
+applicable to the 'git rev-list' command.  It also supports a few
+options applicable to the 'git diff-*' commands to control how the
+changes each commit introduces are shown.  Finally, it supports some
+gitk-specific options.
+
+gitk generally only understands options with arguments in the
+'sticked' form (see linkgit:gitcli[7]) due to limitations in the
+command-line parser.
+
+rev-list options and arguments
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This manual page describes only the most frequently used options.  See
+linkgit:git-rev-list[1] for a complete list.
+
+--all::
+
+	Show all refs (branches, tags, etc.).
+
+--branches[=<pattern>]::
+--tags[=<pattern>]::
+--remotes[=<pattern>]::
+
+	Pretend as if all the branches (tags, remote branches, resp.)
+	are listed on the command line as '<commit>'. If '<pattern>'
+	is given, limit refs to ones matching given shell glob. If
+	pattern lacks '?', '{asterisk}', or '[', '/{asterisk}' at the
+	end is implied.
+
+--since=<date>::
+
+	Show commits more recent than a specific date.
+
+--until=<date>::
+
+	Show commits older than a specific date.
+
+--date-order::
+
+	Sort commits by date when possible.
+
+--merge::
+
+	After an attempt to merge stops with conflicts, show the commits on
+	the history between two branches (i.e. the HEAD and the MERGE_HEAD)
+	that modify the conflicted files and do not exist on all the heads
+	being merged.
+
+--left-right::
+
+	Mark which side of a symmetric difference a commit is reachable
+	from.  Commits from the left side are prefixed with a `<`
+	symbol and those from the right with a `>` symbol.
+
+--full-history::
+
+	When filtering history with '<path>...', does not prune some
+	history.  (See "History simplification" in linkgit:git-log[1]
+	for a more detailed explanation.)
+
+--simplify-merges::
+
+	Additional option to `--full-history` to remove some needless
+	merges from the resulting history, as there are no selected
+	commits contributing to this merge.  (See "History
+	simplification" in linkgit:git-log[1] for a more detailed
+	explanation.)
+
+--ancestry-path::
+
+	When given a range of commits to display
+	(e.g. 'commit1..commit2' or 'commit2 {caret}commit1'), only
+	display commits that exist directly on the ancestry chain
+	between the 'commit1' and 'commit2', i.e. commits that are
+	both descendants of 'commit1', and ancestors of 'commit2'.
+	(See "History simplification" in linkgit:git-log[1] for a more
+	detailed explanation.)
+
+-L<start>,<end>:<file>::
+-L:<funcname>:<file>::
+
+	Trace the evolution of the line range given by "<start>,<end>"
+	(or the function name regex <funcname>) within the <file>.  You may
+	not give any pathspec limiters.  This is currently limited to
+	a walk starting from a single revision, i.e., you may only
+	give zero or one positive revision arguments.
+	You can specify this option more than once.
++
+*Note:* gitk (unlike linkgit:git-log[1]) currently only understands
+this option if you specify it "glued together" with its argument.  Do
+*not* put a space after `-L`.
++
+include::line-range-format.txt[]
+
+<revision range>::
+
+	Limit the revisions to show. This can be either a single revision
+	meaning show from the given revision and back, or it can be a range in
+	the form "'<from>'..'<to>'" to show all revisions between '<from>' and
+	back to '<to>'. Note, more advanced revision selection can be applied.
+	For a more complete list of ways to spell object names, see
+	linkgit:gitrevisions[7].
+
+<path>...::
+
+	Limit commits to the ones touching files in the given paths. Note, to
+	avoid ambiguity with respect to revision names use "--" to separate the paths
+	from any preceding options.
+
+gitk-specific options
+~~~~~~~~~~~~~~~~~~~~~
+
+--argscmd=<command>::
+
+	Command to be run each time gitk has to determine the revision
+	range to show.  The command is expected to print on its
+	standard output a list of additional revisions to be shown,
+	one per line.  Use this instead of explicitly specifying a
+	'<revision range>' if the set of commits to show may vary
+	between refreshes.
+
+--select-commit=<ref>::
+
+	Select the specified commit after loading the graph.
+	Default behavior is equivalent to specifying '--select-commit=HEAD'.
+
+Examples
+--------
+gitk v2.6.12.. include/scsi drivers/scsi::
+
+	Show the changes since version 'v2.6.12' that changed any
+	file in the include/scsi or drivers/scsi subdirectories
+
+gitk --since="2 weeks ago" \-- gitk::
+
+	Show the changes during the last two weeks to the file 'gitk'.
+	The "--" is necessary to avoid confusion with the *branch* named
+	'gitk'
+
+gitk --max-count=100 --all \-- Makefile::
+
+	Show at most 100 changes made to the file 'Makefile'. Instead of only
+	looking for changes in the current branch look in all branches.
+
+Files
+-----
+User configuration and preferences are stored at:
+
+* `$XDG_CONFIG_HOME/git/gitk` if it exists, otherwise
+* `$HOME/.gitk` if it exists
+
+If neither of the above exist then `$XDG_CONFIG_HOME/git/gitk` is created and
+used by default. If '$XDG_CONFIG_HOME' is not set it defaults to
+`$HOME/.config` in all cases.
+
+History
+-------
+Gitk was the first graphical repository browser. It's written in
+tcl/tk.
+
+'gitk' is actually maintained as an independent project, but stable
+versions are distributed as part of the Git suite for the convenience
+of end users.
+
+gitk-git/ comes from Paul Mackerras's gitk project:
+
+	git://ozlabs.org/~paulus/gitk
+
+SEE ALSO
+--------
+'qgit(1)'::
+	A repository browser written in C++ using Qt.
+
+'tig(1)'::
+	A minimal repository browser and Git tool output highlighter written
+	in C using Ncurses.
+
+GIT
+---
+Part of the linkgit:git[1] suite