android - Converting custom_rules.xml to a gradle version -

i'm working on existing project relies heavily on lot of configuration custom_rules.xml ant build. i've looked around online have yet come across explicitly dealing such task in great detail. i've played around gradle , tried doing suggested approaches nothing has worked yet. if point me in right direction appreciate it.

edit: need rebuild using gradle. love rid off doing via command line not mention handling dependencies , etc.

<?xml version="1.0" encoding="utf-8"?> 

set pre compile

<!-- ========================================================================================= --> <!-- once update android sdk, please copy target build.xml under android sdk         --> <!-- ========================================================================================= -->  <!-- updates pre-processed png cache --> <target name="-crunch">     <echo>set crunch</echo>     <exec executable="${aapt}" taskname="crunch">         <arg value="crunch" />         <arg value="-v" />         <arg value="-s" />         <arg path="${resource.absolute.dir}" />         <arg value="-c" />         <arg path="${out.res.absolute.dir}" />     </exec> </target>  <!-- ========================================================================================= --> <!-- once update android sdk, please copy target build.xml under android sdk         --> <!-- ========================================================================================= -->  <!-- puts project's resources output package file      can create multiple resource package in case      custom apk specific configuration have been      declared in default.properties.      --> <target name="-package-resources" depends="-crunch">     <!-- package resources if *not* library project -->     <echo>made crunch</echo>     <do-only-if-not-library elsetext="library project: not package resources..." >         <aapt executable="${aapt}"                 command="package"                 versioncode="${version.code}"                 versionname="${version.name}"                 debug="${build.is.packaging.debug}"                 manifest="${out.manifest.abs.file}"                 assets="${asset.absolute.dir}"                 androidjar="${project.target.android.jar}"                 apkfolder="${out.absolute.dir}"                 nocrunch="${build.packaging.nocrunch}"                 resourcefilename="${resource.package.file.name}"                 resourcefilter="${aapt.resource.filter}"                 libraryresfolderpathrefid="project.library.res.folder.path"                 librarypackagesrefid="project.library.packages"                 libraryrfilerefid="project.library.bin.r.file.path"                 previousbuildtype="${build.last.target}"                 buildtype="${build.target}"                 ignoreassets="${aapt.ignore.assets}"                 manifestpackage="com.myproj">             <res path="${out.res.absolute.dir}" />             <res path="${resource.absolute.dir}" />             <!-- <nocompress /> forces no compression on files in assets or res/raw -->             <!-- <nocompress extension="xml" /> forces no compression on specific file extensions in assets , res/raw -->         </aapt>     </do-only-if-not-library> </target>  <target name="-post-package" >     <property name="config_path" location="${cert.dir}" />     <property name="out.pre.signlib.signed.file" location="${out.absolute.dir}/${ant.project.name}-release-pre-signlib-sign.apk" />     <property name="out.signlib.signed.file" location="${out.absolute.dir}/${ant.project.name}-release-signlib-signed.apk" />     <echo>sign signlib certificate</echo>     <touch file="res/raw/my.properties"/>     <copy file="${out.packaged.file}" tofile="${out.pre.signlib.signed.file}"/>     <java jar="apksigtool.jar" failonerror="true" fork="true">               <arg value="${out.packaged.file}"/>         <arg value="private_key.der" />         <arg value="my.crt" />     </java>     <copy file="${out.packaged.file}" tofile="${out.signlib.signed.file}"/> </target>