Generate version code and version name for AndroidManifest.xml based on commit history.

Version code and version name generation using Ant

<?xml version="1.0" encoding="UTF-8"?>
<project name="git-revision">
    <!-- Set your own path if needed -->
    <property name="git.path">C:\Program Files (x86)\Git\bin\git.exe</property>
    <property name="manifest.path">AndroidManifest.xml</property>

    <!-- Generate version code only. Useful if no tags are present yet. -->
    <target name="version-code">
        <exec executable="${git.path}" outputproperty="version.code">
            <arg value="rev-list" />
            <arg value="HEAD" />
            <!--<arg value="-first-parent" />-->
            <arg value="--count" />
        </exec>
        <echo>Version code: ${version.code}</echo>
        <replaceregexp file="${manifest.path}" match='android:versionCode=".*"'
            replace='android:versionCode="${version.code}"' />
    </target>

    <!-- Generate version code  and version name.
         Code = number of commits in HEAD
         Name = v[last tag].[number of commits since last tag]
            (Assuming each tag marks a release).
    -->
    <target name="version-code-and-name">
        <!-- Get last tag -->
        <exec executable="${git.path}" outputproperty="last.tag">
            <arg value="rev-list" />
            <arg value="--tags" />
            <arg value="--no-walk" />
            <arg value="--max-count=1" />
        </exec>
        <exec executable="${git.path}" outputproperty="version.code">
            <arg value="rev-list" />
            <arg value="HEAD" />
            <!--<arg value="-first-parent" />-->
            <arg value="--count" />
        </exec>
        <exec executable="${git.path}" outputproperty="version.commits">
            <arg value="rev-list" />
            <arg value="${last.tag}..HEAD" />
            <!--<arg value="-first-parent" />-->
            <arg value="--count" />
        </exec>
        <echo>Version code: ${version.code}</echo>
        <replaceregexp file="${manifest.path}" match='android:versionCode=".*"'
            replace='android:versionCode="${version.code}"' />
        <exec executable="${git.path}" outputproperty="version.name">
            <arg value="describe" />
            <arg value="--tags" />
            <arg value="--abbrev=0" />
        </exec>
        <echo>Version name: v${version.name}.${version.commits}</echo>
        <replaceregexp file="${manifest.path}" match='android:versionName=".*"'
            replace='android:versionName="v${version.name}.${version.commits}"' />
    </target>

</project>