Documentation/git-for-each-ref.txt - jrn/git - Git at Google

 git-for-each-ref(1)
 ===================

 NAME
 ----
 git-for-each-ref - Output information on each ref

 SYNOPSIS
 --------
 [verse]
 'git for-each-ref' [--count=<count>] [--shell|--perl|--python|--tcl]
 		   [(--sort=<key>)...] [--format=<format>] [<pattern>...]

 DESCRIPTION
 -----------

 Iterate over all refs that match `<pattern>` and show them
 according to the given `<format>`, after sorting them according
 to the given set of `<key>`.  If `<count>` is given, stop after
 showing that many refs.  The interpolated values in `<format>`
 can optionally be quoted as string literals in the specified
 host language allowing their direct evaluation in that language.

 OPTIONS
 -------
 <count>::
 	By default the command shows all refs that match
 	`<pattern>`.  This option makes it stop after showing
 	that many refs.

 <key>::
 	A field name to sort on.  Prefix `-` to sort in
 	descending order of the value.  When unspecified,
 	`refname` is used.  You may use the --sort=<key> option
 	multiple times, in which case the last key becomes the primary
 	key.

 <format>::
 	A string that interpolates `%(fieldname)` from the
 	object pointed at by a ref being shown.  If `fieldname`
 	is prefixed with an asterisk (`*`) and the ref points
 	at a tag object, the value for the field in the object
 	tag refers is used.  When unspecified, defaults to
 	`%(objectname) SPC %(objecttype) TAB %(refname)`.
 	It also interpolates `%%` to `%`, and `%xx` where `xx`
 	are hex digits interpolates to character with hex code
 	`xx`; for example `%00` interpolates to `\0` (NUL),
 	`%09` to `\t` (TAB) and `%0a` to `\n` (LF).

 <pattern>...::
 	If one or more patterns are given, only refs are shown that
 	match against at least one pattern, either using fnmatch(3) or
 	literally, in the latter case matching completely or from the
 	beginning up to a slash.

 --shell::
 --perl::
 --python::
 --tcl::
 	If given, strings that substitute `%(fieldname)`
 	placeholders are quoted as string literals suitable for
 	the specified host language.  This is meant to produce
 	a scriptlet that can directly be `eval`ed.


 FIELD NAMES
 -----------

 Various values from structured fields in referenced objects can
 be used to interpolate into the resulting output, or as sort
 keys.

 For all objects, the following names can be used:

 refname::
 	The name of the ref (the part after $GIT_DIR/).
 	For a non-ambiguous short name of the ref append `:short`.
 	The option core.warnAmbiguousRefs is used to select the strict
 	abbreviation mode.

 objecttype::
 	The type of the object (`blob`, `tree`, `commit`, `tag`).

 objectsize::
 	The size of the object (the same as 'git cat-file -s' reports).

 objectname::
 	The object name (aka SHA-1).
 	For a non-ambiguous abbreviation of the object name append `:short`.

 upstream::
 	The name of a local ref which can be considered ``upstream''
 	from the displayed ref. Respects `:short` in the same way as
 	`refname` above.  Additionally respects `:track` to show
 	"[ahead N, behind M]" and `:trackshort` to show the terse
 	version: ">" (ahead), "<" (behind), "<>" (ahead and behind),
 	or "=" (in sync).  Has no effect if the ref does not have
 	tracking information associated with it.

 push::
 	The name of a local ref which represents the `@{push}` location
 	for the displayed ref. Respects `:short`, `:track`, and
 	`:trackshort` options as `upstream` does. Produces an empty
 	string if no `@{push}` ref is configured.

 HEAD::
 	'*' if HEAD matches current ref (the checked out branch), ' '
 	otherwise.

 color::
 	Change output color.  Followed by `:<colorname>`, where names
 	are described in `color.branch.*`.

 In addition to the above, for commit and tag objects, the header
 field names (`tree`, `parent`, `object`, `type`, and `tag`) can
 be used to specify the value in the header field.

 Fields that have name-email-date tuple as its value (`author`,
 `committer`, and `tagger`) can be suffixed with `name`, `email`,
 and `date` to extract the named component.

 The complete message in a commit and tag object is `contents`.
 Its first line is `contents:subject`, where subject is the concatenation
 of all lines of the commit message up to the first blank line.  The next
 line is 'contents:body', where body is all of the lines after the first
 blank line.  Finally, the optional GPG signature is `contents:signature`.

 For sorting purposes, fields with numeric values sort in numeric
 order (`objectsize`, `authordate`, `committerdate`, `taggerdate`).
 All other fields are used to sort in their byte-value order.

 In any case, a field name that refers to a field inapplicable to
 the object referred by the ref does not cause an error.  It
 returns an empty string instead.

 As a special case for the date-type fields, you may specify a format for
 the date by adding one of `:default`, `:relative`, `:short`, `:local`,
 `:iso8601`, `:rfc2822` or `:raw` to the end of the fieldname; e.g.
 `%(taggerdate:relative)`.


 EXAMPLES
 --------

 An example directly producing formatted text.  Show the most recent
 3 tagged commits:

 ------------
 #!/bin/sh

 git for-each-ref --count=3 --sort='-*authordate' \
 --format='From: %(*authorname) %(*authoremail)
 Subject: %(*subject)
 Date: %(*authordate)
 Ref: %(*refname)

 %(*body)
 ' 'refs/tags'
 ------------


 A simple example showing the use of shell eval on the output,
 demonstrating the use of --shell.  List the prefixes of all heads:
 ------------
 #!/bin/sh

 git for-each-ref --shell --format="ref=%(refname)" refs/heads | \
 while read entry
 do
 	eval "$entry"
 	echo `dirname $ref`
 done
 ------------


 A bit more elaborate report on tags, demonstrating that the format
 may be an entire script:
 ------------
 #!/bin/sh

 fmt='
 	r=%(refname)
 	t=%(*objecttype)
 	T=${r#refs/tags/}

 	o=%(*objectname)
 	n=%(*authorname)
 	e=%(*authoremail)
 	s=%(*subject)
 	d=%(*authordate)
 	b=%(*body)

 	kind=Tag
 	if test "z$t" = z
 	then
 		# could be a lightweight tag
 		t=%(objecttype)
 		kind="Lightweight tag"
 		o=%(objectname)
 		n=%(authorname)
 		e=%(authoremail)
 		s=%(subject)
 		d=%(authordate)
 		b=%(body)
 	fi
 	echo "$kind $T points at a $t object $o"
 	if test "z$t" = zcommit
 	then
 		echo "The commit was authored by $n $e
 at $d, and titled

     $s

 Its message reads as:
 "
 		echo "$b" | sed -e "s/^/    /"
 		echo
 	fi
 '

 eval=`git for-each-ref --shell --format="$fmt" \
 	--sort='*objecttype' \
 	--sort=-taggerdate \
 	refs/tags`
 eval "$eval"
 ------------

 SEE ALSO
 --------
 linkgit:git-show-ref[1]

 GIT
 ---
 Part of the linkgit:git[1] suite
	git-for-each-ref(1)
	===================

	NAME
	----
	git-for-each-ref - Output information on each ref

	SYNOPSIS
	--------
	[verse]
	'git for-each-ref' [--count=<count>] [--shell\|--perl\|--python\|--tcl]
	[(--sort=<key>)...] [--format=<format>] [<pattern>...]

	DESCRIPTION
	-----------

	Iterate over all refs that match `<pattern>` and show them
	according to the given `<format>`, after sorting them according
	to the given set of `<key>`. If `<count>` is given, stop after
	showing that many refs. The interpolated values in `<format>`
	can optionally be quoted as string literals in the specified
	host language allowing their direct evaluation in that language.

	OPTIONS
	-------
	<count>::
	By default the command shows all refs that match
	`<pattern>`. This option makes it stop after showing
	that many refs.

	<key>::
	A field name to sort on. Prefix `-` to sort in
	descending order of the value. When unspecified,
	`refname` is used. You may use the --sort=<key> option
	multiple times, in which case the last key becomes the primary
	key.

	<format>::
	A string that interpolates `%(fieldname)` from the
	object pointed at by a ref being shown. If `fieldname`
	is prefixed with an asterisk (`*`) and the ref points
	at a tag object, the value for the field in the object
	tag refers is used. When unspecified, defaults to
	`%(objectname) SPC %(objecttype) TAB %(refname)`.
	It also interpolates `%%` to `%`, and `%xx` where `xx`
	are hex digits interpolates to character with hex code
	`xx`; for example `%00` interpolates to `\0` (NUL),
	`%09` to `\t` (TAB) and `%0a` to `\n` (LF).

	<pattern>...::
	If one or more patterns are given, only refs are shown that
	match against at least one pattern, either using fnmatch(3) or
	literally, in the latter case matching completely or from the
	beginning up to a slash.

	--shell::
	--perl::
	--python::
	--tcl::
	If given, strings that substitute `%(fieldname)`
	placeholders are quoted as string literals suitable for
	the specified host language. This is meant to produce
	a scriptlet that can directly be `eval`ed.


	FIELD NAMES
	-----------

	Various values from structured fields in referenced objects can
	be used to interpolate into the resulting output, or as sort
	keys.

	For all objects, the following names can be used:

	refname::
	The name of the ref (the part after $GIT_DIR/).
	For a non-ambiguous short name of the ref append `:short`.
	The option core.warnAmbiguousRefs is used to select the strict
	abbreviation mode.

	objecttype::
	The type of the object (`blob`, `tree`, `commit`, `tag`).

	objectsize::
	The size of the object (the same as 'git cat-file -s' reports).

	objectname::
	The object name (aka SHA-1).
	For a non-ambiguous abbreviation of the object name append `:short`.

	upstream::
	The name of a local ref which can be considered ``upstream''
	from the displayed ref. Respects `:short` in the same way as
	`refname` above. Additionally respects `:track` to show
	"[ahead N, behind M]" and `:trackshort` to show the terse
	version: ">" (ahead), "<" (behind), "<>" (ahead and behind),
	or "=" (in sync). Has no effect if the ref does not have
	tracking information associated with it.

	push::
	The name of a local ref which represents the `@{push}` location
	for the displayed ref. Respects `:short`, `:track`, and
	`:trackshort` options as `upstream` does. Produces an empty
	string if no `@{push}` ref is configured.

	HEAD::
	'*' if HEAD matches current ref (the checked out branch), ' '
	otherwise.

	color::
	Change output color. Followed by `:<colorname>`, where names
	are described in `color.branch.*`.

	In addition to the above, for commit and tag objects, the header
	field names (`tree`, `parent`, `object`, `type`, and `tag`) can
	be used to specify the value in the header field.

	Fields that have name-email-date tuple as its value (`author`,
	`committer`, and `tagger`) can be suffixed with `name`, `email`,
	and `date` to extract the named component.

	The complete message in a commit and tag object is `contents`.
	Its first line is `contents:subject`, where subject is the concatenation
	of all lines of the commit message up to the first blank line. The next
	line is 'contents:body', where body is all of the lines after the first
	blank line. Finally, the optional GPG signature is `contents:signature`.

	For sorting purposes, fields with numeric values sort in numeric
	order (`objectsize`, `authordate`, `committerdate`, `taggerdate`).
	All other fields are used to sort in their byte-value order.

	In any case, a field name that refers to a field inapplicable to
	the object referred by the ref does not cause an error. It
	returns an empty string instead.

	As a special case for the date-type fields, you may specify a format for
	the date by adding one of `:default`, `:relative`, `:short`, `:local`,
	`:iso8601`, `:rfc2822` or `:raw` to the end of the fieldname; e.g.
	`%(taggerdate:relative)`.


	EXAMPLES
	--------

	An example directly producing formatted text. Show the most recent
	3 tagged commits:

	------------
	#!/bin/sh

	git for-each-ref --count=3 --sort='-*authordate' \
	--format='From: %(authorname) %(authoremail)
	Subject: %(*subject)
	Date: %(*authordate)
	Ref: %(*refname)

	%(*body)
	' 'refs/tags'
	------------


	A simple example showing the use of shell eval on the output,
	demonstrating the use of --shell. List the prefixes of all heads:
	------------
	#!/bin/sh

	git for-each-ref --shell --format="ref=%(refname)" refs/heads \| \
	while read entry
	do
	eval "$entry"
	echo `dirname $ref`
	done
	------------


	A bit more elaborate report on tags, demonstrating that the format
	may be an entire script:
	------------
	#!/bin/sh

	fmt='
	r=%(refname)
	t=%(*objecttype)
	T=${r#refs/tags/}

	o=%(*objectname)
	n=%(*authorname)
	e=%(*authoremail)
	s=%(*subject)
	d=%(*authordate)
	b=%(*body)

	kind=Tag
	if test "z$t" = z
	then
	# could be a lightweight tag
	t=%(objecttype)
	kind="Lightweight tag"
	o=%(objectname)
	n=%(authorname)
	e=%(authoremail)
	s=%(subject)
	d=%(authordate)
	b=%(body)
	fi
	echo "$kind $T points at a $t object $o"
	if test "z$t" = zcommit
	then
	echo "The commit was authored by $n $e
	at $d, and titled

	$s

	Its message reads as:
	"
	echo "$b" \| sed -e "s/^/ /"
	echo
	fi
	'

	eval=`git for-each-ref --shell --format="$fmt" \
	--sort='*objecttype' \
	--sort=-taggerdate \
	refs/tags`
	eval "$eval"
	------------

	SEE ALSO
	--------
	linkgit:git-show-ref[1]

	GIT
	---
	Part of the linkgit:git[1] suite