Generate a Flex Library manifest XML file via Ant by utilizing Flex metadata.

manifestGenerator

<!--
==========================================================================
	Macro: generateManifestFile
	Creates a manifest file for components using the [Manifest( "ComponentName" )]
	metadata.
==========================================================================
-->
<macrodef name="generateManifestFile">
	<attribute name="outputFile" default="${basedir}/manifest.xml" />
	<attribute name="sourceDirectory" default="src" />
	
	<sequential>
		<var name="manifest.content" value="${manifest.template.contents}" />
		<var name="components" value="" />
		<var name="component.xml.declarations" value="" />
		<property name="tab" value="	" />
		<for param="file"> 
			<path> 
				<fileset dir="${basedir}/@{sourceDirectory}" casesensitive="no">
					<include name="**/*.as" />
					<include name="**/*.mxml" />
					<contains text="[Manifest" caseSensitive="true" />
				</fileset>
			</path>
			<sequential>
				<echo message="File: @{file}" />
				<loadfile property="currentFileContents.@{file}" srcFile="@{file}"/>
				<propertyregex property="manifest.name.@{file}"
					input="${currentFileContents.@{file}}"
					regexp='\[Manifest\( *\"(.*)\" *\)\]'
					select="\1"
					casesensitive="false" />
				<echo message="Manifest Name: ${manifest.name.@{file}}" />
				<pathconvert property="output.path.@{file}" dirsep="." >
					<path>
						<pathelement location="@{file}" />
					</path>
				      <map from="${basedir}/@{sourceDirectory}/" to=""/>
				 </pathconvert>
				<propertyregex property="as.path.@{file}"
					input="${output.path.@{file}}"
					regexp="(.*)(\.as|\.mxml)"
					select="\1"
					casesensitive="false" />
				<var name="components" value="${components},${as.path.@{file}}|${manifest.name.@{file}}" />
			</sequential>
		</for>
		<sortlist property="components.sorted"
			value="${components}"
			delimiter="," />
		<echo message="Sorted List: ${components.sorted}" />
		<for list="${components.sorted}" delimiter="," param="component.details">
			<sequential>
				<propertyregex property="component.line.@{component.details}"
	              input="@{component.details}"
	              regexp="(.*)\|(.*)"
					replace='&lt;component id\=\"\2\" class\=\"\1\"\/&gt;'
	              casesensitive="false" />
				<var name="component.xml.declarations" value="${component.xml.declarations}${tab}${component.line.@{component.details}}${line.separator}" />
			</sequential>
		</for>
		<echo file="@{outputFile}" append="false" message='&lt;?xml version="1.0"?&gt;${line.separator}&lt;componentPackage&gt;${line.separator}${component.xml.declarations}&lt;/componentPackage&gt;' />
	</sequential>
		
</macrodef>