scratch/output/Scratch/fr/blog/2010-09-02-Use-git-to-calculate-trusted-mtimes/code/gitmtime.rb

def gitmtime
    filepath=@item.path.sub('/Scratch/','content/html/').sub(/\/$/,'')
    ext=%{.#{@item[:extension]}}
    filepath<<=ext
    if not FileTest.exists?(filepath)
        filepath.sub!(ext,%{/index#{ext}})
    end
    str=`git log -1 --format='%ci' -- #{filepath}`
    if str.nil? or str.empty?
        return Time.now
    else
        return DateTime.parse( str )
    end
end