Setting build numbers with Nant

I wanted something that would update the version number of my builds from within Nant. I found that using some of the built in functions of Nant I could get what I wanted without too much work. Nothing really exciting here, but a couple of notes. First the version numbers stored in the meta data limit the size to uint16.maxvalue - 1 so the value must be less then 65534. As such I could not use the format yyyyMMdd as I wanted to, so I ended up using days since 1/1/2000. Secondly, when loading the file with loadfile I needed to mark the encoding as UTF-8 so that the file would be writen back out in a usable form. Anyway, here's the nant code I ended up using.

<property name="build.major" value="0"/>
<property name="build.minor" value="9"/>
<property name="build.build" value="${timespan::get-days(datetime::now() - datetime::parse('01/01/2000'))}"/>
<property name="build.revision" value="0"/>
<property name="build.version" value="${build.major}.${build.minor}.${build.build}.${build.revision}"/>
<foreach item="File" property="assemblyinfofile">
  <in>
    <items basedir="${project.root}">
      <include name="**\AssemblyInfo.cs"/>
    </items>
  </in>
  <do>
    <echo message="${path::get-file-name(assemblyinfofile)}"/>
    <loadfile file="${assemblyinfofile}"property="assemblyinfofile.content"encoding="utf-8"/>
    <regex pattern="&quot;(?'version'\d+\.\d+\.\d+\.\d+|\d+\.\d+\.\*)&quot;" input="${assemblyinfofile.content}"/>
    <echo file="${assemblyinfofile}">${string::replace(assemblyinfofile.content, version, build.version)}</echo>
    <echo message="-> Updated version from ${version} to ${build.version}"/>
  </do>
</foreach>