Merge branch 'kn/ref-filter-branch-list' into next

The code to list branches in "git branch" has been consolidated
with the more generic ref-filter API.

* kn/ref-filter-branch-list:
  branch: implement '--format' option
  branch: use ref-filter printing APIs
  branch, tag: use porcelain output
  ref-filter: allow porcelain to translate messages in the output
  ref-filter: add an 'rstrip=<N>' option to atoms which deal with refnames
  ref-filter: modify the 'lstrip=<N>' option to work with negative '<N>'
  ref-filter: Do not abruptly die when using the 'lstrip=<N>' option
  ref-filter: rename the 'strip' option to 'lstrip'
  ref-filter: make remote_ref_atom_parser() use refname_atom_parser_internal()
  ref-filter: introduce refname_atom_parser()
  ref-filter: introduce refname_atom_parser_internal()
  ref-filter: make "%(symref)" atom work with the ':short' modifier
  ref-filter: add support for %(upstream:track,nobracket)
  ref-filter: make %(upstream:track) prints "[gone]" for invalid upstreams
  ref-filter: introduce format_ref_array_item()
  ref-filter: move get_head_description() from branch.c
  ref-filter: modify "%(objectname:short)" to take length
  ref-filter: implement %(if:equals=<string>) and %(if:notequals=<string>)
  ref-filter: include reference to 'used_atom' within 'atom_value'
  ref-filter: implement %(if), %(then), and %(else) atoms

Documentation/git-branch.txt

@@ -12,7 +12,7 @@ SYNOPSIS
 	[--list] [-v [--abbrev=<length> | --no-abbrev]]
 	[--column[=<options>] | --no-column]
 	[(--merged | --no-merged | --contains) [<commit>]] [--sort=<key>]
-	[--points-at <object>] [<pattern>...]
+	[--points-at <object>] [--format=<format>] [<pattern>...]
 'git branch' [--set-upstream | --track | --no-track] [-l] [-f] <branchname> [<start-point>]
 'git branch' (--set-upstream-to=<upstream> | -u <upstream>) [<branchname>]
 'git branch' --unset-upstream [<branchname>]
@@ -250,6 +250,11 @@ start-point is either a local or remote-tracking branch.
 --points-at <object>::
 	Only list branches of the given object.
 
+--format <format>::
+	A string that interpolates `%(fieldname)` from the object
+	pointed at by a ref being shown.  The format is the same as
+	that of linkgit:git-for-each-ref[1].
+
 Examples
 --------
 

Documentation/git-for-each-ref.txt

@@ -95,11 +95,18 @@ 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. If `strip=<N>` is appended, strips `<N>`
-	slash-separated path components from the front of the refname
-	(e.g., `%(refname:strip=2)` turns `refs/tags/foo` into `foo`.
-	`<N>` must be a positive integer.  If a displayed ref has fewer
-	components than `<N>`, the command aborts with an error.
+	abbreviation mode. If `lstrip=<N>` (`rstrip=<N>`) is appended, strips `<N>`
+	slash-separated path components from the front (back) of the refname
+	(e.g. `%(refname:lstrip=2)` turns `refs/tags/foo` into `foo` and
+	`%(refname:rstrip=2)` turns `refs/tags/foo` into `refs`).
+	If `<N>` is a negative number, strip as many path components as
+	necessary from the specified end to leave `-<N>` path components
+	(e.g. `%(refname:lstrip=-2)` turns
+	`refs/tags/foo` into `tags/foo` and `%(refname:rstrip=-1)`
+	turns `refs/tags/foo` into `refs`). When the ref does not have
+	enough components, the result becomes an empty string if
+	stripping with positive <N>, or it becomes the full refname if
+	stripping with negative <N>.  Neither is an error.
 
 objecttype::
 	The type of the object (`blob`, `tree`, `commit`, `tag`).
@@ -110,21 +117,31 @@ objectsize::
 objectname::
 	The object name (aka SHA-1).
 	For a non-ambiguous abbreviation of the object name append `:short`.
+	For an abbreviation of the object name with desired length append
+	`:short=<length>`, where the minimum length is MINIMUM_ABBREV. The
+	length may be exceeded to ensure unique object names.
 
 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.
+	from the displayed ref. Respects `:short`, `:lstrip` and
+	`:rstrip` 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). `:track`
+	also prints "[gone]" whenever unknown upstream ref is
+	encountered. Append `:track,nobracket` to show tracking
+	information without brackets (i.e "ahead N, behind M").  Has
+	no effect if the ref does not have tracking information
+	associated with it.  All the options apart from `nobracket`
+	are mutually exclusive, but if used together the last option
+	is selected.
 
 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.
+	The name of a local ref which represents the `@{push}`
+	location for the displayed ref. Respects `:short`, `:lstrip`,
+	`:rstrip`, `: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), ' '
@@ -149,6 +166,25 @@ align::
 	quoted, but if nested then only the topmost level performs
 	quoting.
 
+if::
+	Used as %(if)...%(then)...%(end) or
+	%(if)...%(then)...%(else)...%(end).  If there is an atom with
+	value or string literal after the %(if) then everything after
+	the %(then) is printed, else if the %(else) atom is used, then
+	everything after %(else) is printed. We ignore space when
+	evaluating the string before %(then), this is useful when we
+	use the %(HEAD) atom which prints either "*" or " " and we
+	want to apply the 'if' condition only on the 'HEAD' ref.
+	Append ":equals=<string>" or ":notequals=<string>" to compare
+	the value between the %(if:...) and %(then) atoms with the
+	given string.
+
+symref::
+	The ref which the given symbolic ref refers to. If not a
+	symbolic ref, nothing is printed. Respects the `:short`,
+	`:lstrip` and `:rstrip` options in the same way as `refname`
+	above.
+
 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.
@@ -186,6 +222,14 @@ As a special case for the date-type fields, you may specify a format for
 the date by adding `:` followed by date format name (see the
 values the `--date` option to linkgit:git-rev-list[1] takes).
 
+Some atoms like %(align) and %(if) always require a matching %(end).
+We call them "opening atoms" and sometimes denote them as %($open).
+
+When a scripting language specific quoting is in effect, everything
+between a top-level opening atom and its matching %(end) is evaluated
+according to the semantics of the opening atom and only its result
+from the top-level is quoted.
+
 
 EXAMPLES
 --------
@@ -273,6 +317,22 @@ eval=`git for-each-ref --shell --format="$fmt" \
 eval "$eval"
 ------------
 
+
+An example to show the usage of %(if)...%(then)...%(else)...%(end).
+This prefixes the current branch with a star.
+
+------------
+git for-each-ref --format="%(if)%(HEAD)%(then)* %(else)  %(end)%(refname:short)" refs/heads/
+------------
+
+
+An example to show the usage of %(if)...%(then)...%(end).
+This prints the authorname, if present.
+
+------------
+git for-each-ref --format="%(refname)%(if)%(authorname)%(then) Authored by: %(authorname)%(end)"
+------------
+
 SEE ALSO
 --------
 linkgit:git-show-ref[1]