= AUTOREVISION(1) =

== NAME ==
autorevision - extract current-revision metadata from version-control repositories

== SYNOPSIS ==
*autorevision* *-t* <output-type> [*-o* <cache-file> [*-f*]&#8201;] [*-U*]

*autorevision* *-s* <symbol> [*-o* <cache-file> [*-f*]&#8201;] [*-U*]

*autorevision* *-V*

== DESCRIPTION ==
Extracts metadata about the head revision from your repository.

This program is meant to be used by project build systems to extract
properties that can be used in version strings. It can emit source
files containing variable and macro definitions suitable for use with
C, C++, Java, Mac info.plist, sh, Python, Perl and many other types of
files (see below for the full list).

The generated source is written to the standard output.

This program can normally be called from anywhere within a repository
copy.  Under bzr the copy must be of a branch, not a full multibranch
repository.  Under Subversion it must be called under a repository
checkout, not the repository itself.

If you specify a cache file, then when *autorevision* is run where no
repository can be recognized, the values from the cache file will be
used instead.  If a repository can be recognized, the cache is
rewritten. This feature makes it possible for your build to run from
an unpacked tarball that includes the cache file.

=== Valid Repository Types ===

*Git*: A version greater than 1.7.2.3 is recommended.

*Mercurial*: A version greater than 1.6 is recommended.

*Subversion*: Any production version.

*Bazaar*: Any production version.

=== Valid Output Types ===

*clojure*::
A clojure source file setting clojure variables.

*h*::
A header file suitable for C/C++.

*hpp*::
Alternate C++ header file with namespace.  Namespace is assigned
from VCS_BASENAME.

*ini*::
A ini source file setting ini variables.

*java*::
A Java source file setting class properties.

*javaprop*::
A Java properties file (like ini); useful when META-INF is readable in
Java.

*js*::
A javascript source file setting javascript variables.

*json*::
A JSON format file.

*lua*::
A lua source file setting lua variables.

*m4*::
An m4 source file defining m4 macros.

*matlab*::
Matlab output.

*octave*::
Octave output.

*php*::
A PHP source file setting PHP variables.

*pl*::
A Perl source file setting Perl variables  (*`perl`* is an acceptable
synonym).

*py*::
A Python source file setting Python variables (*`python`* is an
acceptable synonym).

*rpm*::
A RPM spec file format setting spec file macros.

*scheme*::
A scheme source file setting scheme variables.

*sh*::
A text file suitable for including from a bash script.  Will work with
Ruby.

*swift*::
A Swift source file setting Swift global constants. +
Unless set *VCS_EXTRA* and any symbols that are are missing because of
repository support are set to `nil`.

*tex*::
A TeX source file defining TeX macros.  Note that the symbols are
given different names since the underscore has a special meaning in
TeX. For example, VCS_SHORT_HASH is renamed to \vcsShortHash.

*xcode*::
A header like output for use with xcode to populate info.plist strings.

=== Valid Symbol Names ===

*VCS_TYPE*::
The repository type - "git", "hg", "bzr", or "svn".

*VCS_BASENAME*::
The basename of the directory root.  For most VCSes this will simply
be the basename of the repository root directory.  For Subversion,
*autorevision* will attempt to navigate up though trunk, branches, and
tags directories to find the actual root.

*VCS_NUM*::
A count of revisions between the current one and the initial
one; useful for reporting build numbers.

*VCS_UUID*::
A universally unique identifier, generated from the root commit in git
and hg; for svn it uses the supplied UUID. +
For git we choose the oldest commit if there is more than one. +
Not currently implemented for bzr.

*VCS_DATE*::
The date of the most recent commit in true ISO-8601/RFC3339
format, including seconds.

*VCS_BRANCH*::
The name of the branch of the commit graph that was selected when
autoversion was run. +
Under git, this will normally be the shortname of the current branch
(the asterisked line in the output of of "git branch") except that
when the branch doesn't have a shortname it will be a full
refspec. +
Under hg the feature that is called 'branches' is actually a sort of
graph coloring (multiple heads can have the same branch name) so this
symbol is filled with the current bookmark if it exists, with the
current branch name as a fallback. +
Under Subversion this will normally be either 'trunk' or the basename
of some branch or tag subdirectory, depending on where *autoversion*
was run. +
Under bzr, this is the nick of the branch you are on.

*VCS_TAG*::
The name of the most recent tag ancestral to the current commit. +
Empty under Subversion.

*VCS_TICK*::
A count of commits since most recent tag ancestral to the current
commit or an alias of *VCS_NUM* if there are no prior tags. +
Empty under Subversion.

*VCS_EXTRA*::
A symbol set aside specifically to be set by the user through the
environment or via scripts.

*VCS_FULL_HASH*::
A full unique identifier for the current revision.

*VCS_SHORT_HASH*::
A shortened version of *VCS_FULL_HASH*, but *VCS_FULL_HASH* if it
cannot be shortened.

*VCS_WC_MODIFIED*::
Set to `1` if the current working directory has been modified and `0`
if not.  If the output language has native Boolean literals, true will
mean modified and false unmodified.  The C/C++ output is left as
numeric so the preprocessor can test it. +
'Untracked files are not ignored; see *`-U`* for details.'

== OPTIONS ==

*-t* '<output-type>'::
Sets the output type.  It is required unless *`-s`* is specified; both
*`-t`* and *`-s`* cannot be used in the same invocation.

*-s* '<symbol>'::
Changes the reporting behavior; instead of emitting a symbol file to
stdout, only the value of that individual symbol will be reported.  It
is required unless *`-t`* is specified; both *`-t`* and *`-s`* cannot
be used in the same invocation.

*-o* '<cache-file>'::
Sets the name of the cache file.

*-f*::
Forces the use of cache data even when in a repo; useful for speeding
up subsequent runs if more than one output format is needed.

*-U*::
Causes untracked files to be checked when determining if the
working copy is modified 'for Subversion only'.  While this is the
default behavior for all other repository types, it is off by default
for Subversion because of speed concerns.

*-V*::
Emits the autorevision version and exits.

== BUGS ==
The bzr extractor is not very well tested.

When a git repo is actually a git-svn remote, this tool tries to do
the right thing and return a Subversion revision.  The bug is that the
detector code for this case is somewhat unreliable; you will get the
hash instead if your configuration doesn't use svn-remote.svn.url.

Nested repositories, particularly repositories of different types,
_may_ result in incorrect and unintended behavior.

Unpacking a tarball into a repository _will_ result in incorrect and
unintended behavior.

== Notes ==
Development of autorevision is carried out at
https://github.com/Autorevision/autorevision

HTML rendered docs and usage examples can be found at
https://autorevision.github.io/

== AUTHORS ==

dak180 <dak180@users.sf.net>: concept, bash/C/C++/XCode/PHP/ini
support, git and hg extraction. +
Eric S. Raymond <esr@thyrsus.com>: Python/Perl/lua/m4 support, svn and
bzr extraction, git-svn support, CLI design, man page.
