ruby script/plugin install git://github.com/toland/app_version.git

The version numbers supported by this plugin look like '2.0.1 M4 (600)'. The components of the version number are:

2 => major
0 => minor
1 => patch
M4 => milestone
(600) => build number (usually Subversion revision)

Only the major and minor numbers are required. The rest can be omitted and the plugin will attempt to do the right thing.

To use, simply place a file in RAILS_ROOT/config called version.yml with the
following format:

major:     2
minor:     0
patch:     1
milestone: 4
build:     svn

If the milestone or patch fields are less than 0 then they will not show up in the version string. The build field can be a build number or the string svn. If it is a number then that number will be used as the build number, if it is the string 'svn' then the plugin will attempt to query Subversion for the build number.

The plugin creates a constant APP_VERSION that contains the version number of the application. Calling the +to_s+ method on APP_VERSION will result in a properly formatted version number. APP_VERSION also has +major+, +minor+, +patch+, +milestone+ and +build+ methods to retrieve the individual components of the version number.

Finally, there is a rake task for displaying the version number from the command line. 'rake app:version' will output the version number of the current rails application.

There is currently no advanced documentation for this plugin.