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

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+git-grep(1)
+===========
+
+NAME
+----
+git-grep - Print lines matching a pattern
+
+
+SYNOPSIS
+--------
+[verse]
+'git grep' [-a | --text] [-I] [--textconv] [-i | --ignore-case] [-w | --word-regexp]
+	   [-v | --invert-match] [-h|-H] [--full-name]
+	   [-E | --extended-regexp] [-G | --basic-regexp]
+	   [-P | --perl-regexp]
+	   [-F | --fixed-strings] [-n | --line-number] [--column]
+	   [-l | --files-with-matches] [-L | --files-without-match]
+	   [(-O | --open-files-in-pager) [<pager>]]
+	   [-z | --null]
+	   [ -o | --only-matching ] [-c | --count] [--all-match] [-q | --quiet]
+	   [--max-depth <depth>] [--[no-]recursive]
+	   [--color[=<when>] | --no-color]
+	   [--break] [--heading] [-p | --show-function]
+	   [-A <post-context>] [-B <pre-context>] [-C <context>]
+	   [-W | --function-context]
+	   [--threads <num>]
+	   [-f <file>] [-e] <pattern>
+	   [--and|--or|--not|(|)|-e <pattern>...]
+	   [--recurse-submodules] [--parent-basename <basename>]
+	   [ [--[no-]exclude-standard] [--cached | --no-index | --untracked] | <tree>...]
+	   [--] [<pathspec>...]
+
+DESCRIPTION
+-----------
+Look for specified patterns in the tracked files in the work tree, blobs
+registered in the index file, or blobs in given tree objects.  Patterns
+are lists of one or more search expressions separated by newline
+characters.  An empty string as search expression matches all lines.
+
+
+CONFIGURATION
+-------------
+
+grep.lineNumber::
+	If set to true, enable `-n` option by default.
+
+grep.column::
+	If set to true, enable the `--column` option by default.
+
+grep.patternType::
+	Set the default matching behavior. Using a value of 'basic', 'extended',
+	'fixed', or 'perl' will enable the `--basic-regexp`, `--extended-regexp`,
+	`--fixed-strings`, or `--perl-regexp` option accordingly, while the
+	value 'default' will return to the default matching behavior.
+
+grep.extendedRegexp::
+	If set to true, enable `--extended-regexp` option by default. This
+	option is ignored when the `grep.patternType` option is set to a value
+	other than 'default'.
+
+grep.threads::
+	Number of grep worker threads to use.  If unset (or set to 0),
+	8 threads are used by default (for now).
+
+grep.fullName::
+	If set to true, enable `--full-name` option by default.
+
+grep.fallbackToNoIndex::
+	If set to true, fall back to git grep --no-index if git grep
+	is executed outside of a git repository.  Defaults to false.
+
+
+OPTIONS
+-------
+--cached::
+	Instead of searching tracked files in the working tree, search
+	blobs registered in the index file.
+
+--no-index::
+	Search files in the current directory that is not managed by Git.
+
+--untracked::
+	In addition to searching in the tracked files in the working
+	tree, search also in untracked files.
+
+--no-exclude-standard::
+	Also search in ignored files by not honoring the `.gitignore`
+	mechanism. Only useful with `--untracked`.
+
+--exclude-standard::
+	Do not pay attention to ignored files specified via the `.gitignore`
+	mechanism.  Only useful when searching files in the current directory
+	with `--no-index`.
+
+--recurse-submodules::
+	Recursively search in each submodule that has been initialized and
+	checked out in the repository.  When used in combination with the
+	<tree> option the prefix of all submodule output will be the name of
+	the parent project's <tree> object.
+
+-a::
+--text::
+	Process binary files as if they were text.
+
+--textconv::
+	Honor textconv filter settings.
+
+--no-textconv::
+	Do not honor textconv filter settings.
+	This is the default.
+
+-i::
+--ignore-case::
+	Ignore case differences between the patterns and the
+	files.
+
+-I::
+	Don't match the pattern in binary files.
+
+--max-depth <depth>::
+	For each <pathspec> given on command line, descend at most <depth>
+	levels of directories. A value of -1 means no limit.
+	This option is ignored if <pathspec> contains active wildcards.
+	In other words if "a*" matches a directory named "a*",
+	"*" is matched literally so --max-depth is still effective.
+
+-r::
+--recursive::
+	Same as `--max-depth=-1`; this is the default.
+
+--no-recursive::
+	Same as `--max-depth=0`.
+
+-w::
+--word-regexp::
+	Match the pattern only at word boundary (either begin at the
+	beginning of a line, or preceded by a non-word character; end at
+	the end of a line or followed by a non-word character).
+
+-v::
+--invert-match::
+	Select non-matching lines.
+
+-h::
+-H::
+	By default, the command shows the filename for each
+	match.  `-h` option is used to suppress this output.
+	`-H` is there for completeness and does not do anything
+	except it overrides `-h` given earlier on the command
+	line.
+
+--full-name::
+	When run from a subdirectory, the command usually
+	outputs paths relative to the current directory.  This
+	option forces paths to be output relative to the project
+	top directory.
+
+-E::
+--extended-regexp::
+-G::
+--basic-regexp::
+	Use POSIX extended/basic regexp for patterns.  Default
+	is to use basic regexp.
+
+-P::
+--perl-regexp::
+	Use Perl-compatible regular expressions for patterns.
++
+Support for these types of regular expressions is an optional
+compile-time dependency. If Git wasn't compiled with support for them
+providing this option will cause it to die.
+
+-F::
+--fixed-strings::
+	Use fixed strings for patterns (don't interpret pattern
+	as a regex).
+
+-n::
+--line-number::
+	Prefix the line number to matching lines.
+
+--column::
+	Prefix the 1-indexed byte-offset of the first match from the start of the
+	matching line.
+
+-l::
+--files-with-matches::
+--name-only::
+-L::
+--files-without-match::
+	Instead of showing every matched line, show only the
+	names of files that contain (or do not contain) matches.
+	For better compatibility with 'git diff', `--name-only` is a
+	synonym for `--files-with-matches`.
+
+-O[<pager>]::
+--open-files-in-pager[=<pager>]::
+	Open the matching files in the pager (not the output of 'grep').
+	If the pager happens to be "less" or "vi", and the user
+	specified only one pattern, the first file is positioned at
+	the first match automatically. The `pager` argument is
+	optional; if specified, it must be stuck to the option
+	without a space. If `pager` is unspecified, the default pager
+	will be used (see `core.pager` in linkgit:git-config[1]).
+
+-z::
+--null::
+	Output \0 instead of the character that normally follows a
+	file name.
+
+-o::
+--only-matching::
+	Print only the matched (non-empty) parts of a matching line, with each such
+	part on a separate output line.
+
+-c::
+--count::
+	Instead of showing every matched line, show the number of
+	lines that match.
+
+--color[=<when>]::
+	Show colored matches.
+	The value must be always (the default), never, or auto.
+
+--no-color::
+	Turn off match highlighting, even when the configuration file
+	gives the default to color output.
+	Same as `--color=never`.
+
+--break::
+	Print an empty line between matches from different files.
+
+--heading::
+	Show the filename above the matches in that file instead of
+	at the start of each shown line.
+
+-p::
+--show-function::
+	Show the preceding line that contains the function name of
+	the match, unless the matching line is a function name itself.
+	The name is determined in the same way as 'git diff' works out
+	patch hunk headers (see 'Defining a custom hunk-header' in
+	linkgit:gitattributes[5]).
+
+-<num>::
+-C <num>::
+--context <num>::
+	Show <num> leading and trailing lines, and place a line
+	containing `--` between contiguous groups of matches.
+
+-A <num>::
+--after-context <num>::
+	Show <num> trailing lines, and place a line containing
+	`--` between contiguous groups of matches.
+
+-B <num>::
+--before-context <num>::
+	Show <num> leading lines, and place a line containing
+	`--` between contiguous groups of matches.
+
+-W::
+--function-context::
+	Show the surrounding text from the previous line containing a
+	function name up to the one before the next function name,
+	effectively showing the whole function in which the match was
+	found.
+
+--threads <num>::
+	Number of grep worker threads to use.
+	See `grep.threads` in 'CONFIGURATION' for more information.
+
+-f <file>::
+	Read patterns from <file>, one per line.
+
+-e::
+	The next parameter is the pattern. This option has to be
+	used for patterns starting with `-` and should be used in
+	scripts passing user input to grep.  Multiple patterns are
+	combined by 'or'.
+
+--and::
+--or::
+--not::
+( ... )::
+	Specify how multiple patterns are combined using Boolean
+	expressions.  `--or` is the default operator.  `--and` has
+	higher precedence than `--or`.  `-e` has to be used for all
+	patterns.
+
+--all-match::
+	When giving multiple pattern expressions combined with `--or`,
+	this flag is specified to limit the match to files that
+	have lines to match all of them.
+
+-q::
+--quiet::
+	Do not output matched lines; instead, exit with status 0 when
+	there is a match and with non-zero status when there isn't.
+
+<tree>...::
+	Instead of searching tracked files in the working tree, search
+	blobs in the given trees.
+
+\--::
+	Signals the end of options; the rest of the parameters
+	are <pathspec> limiters.
+
+<pathspec>...::
+	If given, limit the search to paths matching at least one pattern.
+	Both leading paths match and glob(7) patterns are supported.
++
+For more details about the <pathspec> syntax, see the 'pathspec' entry
+in linkgit:gitglossary[7].
+
+EXAMPLES
+--------
+
+`git grep 'time_t' -- '*.[ch]'`::
+	Looks for `time_t` in all tracked .c and .h files in the working
+	directory and its subdirectories.
+
+`git grep -e '#define' --and \( -e MAX_PATH -e PATH_MAX \)`::
+	Looks for a line that has `#define` and either `MAX_PATH` or
+	`PATH_MAX`.
+
+`git grep --all-match -e NODE -e Unexpected`::
+	Looks for a line that has `NODE` or `Unexpected` in
+	files that have lines that match both.
+
+`git grep solution -- :^Documentation`::
+	Looks for `solution`, excluding files in `Documentation`.
+
+GIT
+---
+Part of the linkgit:git[1] suite