xml HTML5 Boilerplate是一个专业的前端模板，用于构建快速，健壮且适应性强的Web应用程序或站点。

Posted 2021-05-17

<?xml version="1.0"?>
<project name="Boilerplate Build" default="build" basedir="../"> <!-- one back since we're in build/ -->


    <!-- Load in Ant-Contrib to give us access to some very useful tasks! -->
    <!-- the .jar file is located in the tools directory -->
    <taskdef resource="net/sf/antcontrib/antcontrib.properties">
        <classpath>
            <pathelement location="${basedir}/build/tools/ant-contrib-1.0b3.jar"/>
        </classpath>
    </taskdef>

    <!-- load shell environment -->
    <property environment="ENV" />

    <!-- load property files -->
    <property file="build/config/project.properties"/>
    <property file="build/config/default.properties"/>

    <!-- merge the stylesheet properties -->
    <var name="stylesheet-files" value="${file.stylesheets}, ${file.default.stylesheets}"/>
    
    <!-- merge the pages properties -->
    <var name="page-files" value="${file.pages}, ${file.pages.default.include}"/>


    
    <!--
    *************************************************
    * BASE TARGETS                                  *
    *************************************************
    -->
    <target name="basics">
    <if>
        <equals arg1="${env}" arg2="dev"/>
        <then>
            <!-- Build a dev environment -->
            <echo message="Building a Development Environment..."/>
            <antcall target="-basics.dev"/>
        </then>

        <elseif>
            <equals arg1="${env}" arg2="test"/>
            <then>
                <!-- Build a test environment -->
                <echo message="Building a Test Environment..."/>
                <antcall target="-basics.test"/>
            </then>
        </elseif>

        <else>
            <!-- Build a production environment -->
            <echo message="Building a Production Environment..."/>
            <antcall target="-basics.production"/>
        </else>
    </if>
    </target>


    <target name="text">
    <if>
        <equals arg1="${env}" arg2="dev"/>
        <then>
            <!-- Build a dev environment -->
            <echo message="Building a Development Environment..."/>
            <antcall target="-text.dev"/>
        </then>

        <elseif>
            <equals arg1="${env}" arg2="test"/>
            <then>
                <!-- Build a test environment -->
                <echo message="Building a Test Environment..."/>
                <antcall target="-text.test"/>
            </then>
        </elseif>

        <else>
            <!-- Build a production environment -->
            <echo message="Building a Production Environment..."/>
            <antcall target="-text.production"/>
        </else>
    </if>
    <!-- funky order due to jpegtran being a jerk. See comment at top of imagesjpg task -->
    <antcall target="-jpgcopy"/>
    </target>


    <target name="buildkit">
    <if>
        <equals arg1="${env}" arg2="dev"/>
        <then>
            <!-- Build a dev environment -->
            <echo message="Building a Development Environment..."/>
            <antcall target="-buildkit.dev"/>
        </then>

        <elseif>
            <equals arg1="${env}" arg2="test"/>
            <then>
                <!-- Build a test environment -->
                <echo message="Building a Test Environment..."/>
                <antcall target="-buildkit.test"/>
            </then>
        </elseif>

        <else>
            <!-- Build a production environment -->
            <echo message="Building a Production Environment..."/>
            <antcall target="-buildkit.production"/>
        </else>
    </if>
    </target>


    <target name="build">
    <if>
        <equals arg1="${env}" arg2="dev"/>
        <then>
            <!-- Build a dev environment -->
            <echo message="Building a Development Environment..."/>
            <antcall target="-build.dev" />
        </then>

        <elseif>
            <equals arg1="${env}" arg2="test"/>
            <then>
                <!-- Build a test environment -->
                <echo message="Building a Test Environment..."/>
                <antcall target="-build.test" />
            </then>
        </elseif>

        <else>
            <!-- Build a production environment -->
            <echo message="Building a Production Environment..."/>
            <antcall target="-build.production" />
        </else>
    </if>
    </target>


    <target name="minify">
    <if>
        <equals arg1="${env}" arg2="dev"/>
        <then>
            <!-- Build a dev environment -->
            <echo message="Building a Development Environment..."/>
            <antcall target="-minify.dev"/>
        </then>

        <elseif>
            <equals arg1="${env}" arg2="test"/>
            <then>
                <!-- Build a test environment -->
                <echo message="Building a Test Environment..."/>
                <antcall target="-minify.test"/>
            </then>
        </elseif>

        <else>
            <!-- Build a production environment -->
            <echo message="Building a Production Environment..."/>
            <antcall target="-minify.production"/>
        </else>
    </if>
    </target>
    
    
    <!--
    *************************************************
    * BUILD TARGETS                                 *
    *************************************************
    -->

    <!-- Target: basics -->
    <target name="-basics.dev"
            depends="-rev,
                     -clean,
                     -copy"/>

    <target name="-basics.test"
            depends="-rev,
                     -clean,
                     -copy,
                     -usemin,
                     -js.all.minify,
                     -js.main.concat,
                     -js.mylibs.concat,
                     -js.scripts.concat,
                     -js.delete,
                     -css,
                     -html"/>

    <target name="-basics.production"
            depends="-rev,
                     -clean,
                     -copy,
                     -usemin,
                     -js.all.minify,
                     -js.main.concat,
                     -js.mylibs.concat,
                     -js.scripts.concat,
                     -js.delete,
                     -strip-console.log,
                     -css,
                     -html"/>

    <!-- Target: text -->
    <target name="-text.dev"
            depends="-rev,
                     -clean,
                     -copy"/>

    <target name="-text.test"
            depends="-rev,
                     -clean,
                     -copy,
                     -usemin,
                     -js.all.minify,
                     -js.main.concat,
                     -js.mylibs.concat,
                     -js.scripts.concat,
                     -js.delete,
                     -css,
                     -html,
                     -htmlclean"/>

    <target name="-text.production"
            depends="-rev,
                     -clean,
                     -copy,
                     -usemin,
                     -js.all.minify,
                     -js.main.concat,
                     -js.mylibs.concat,
                     -js.scripts.concat,
                     -js.delete,
                     -strip-console.log,
                     -css,
                     -html,
                     -htmlclean"/>

    <!-- Target: buildkit -->
    <target name="-buildkit.dev"
            depends="-rev,
                     -clean,
                     -prodcopy,
                     -imagespng,
                     -imagesjpg"/>

    <target name="-buildkit.test"
            depends="-rev,
                     -clean,
                     -prodcopy,
                     -usemin,
                     -js.all.minify,
                     -js.main.concat,
                     -js.mylibs.concat,
                     -js.scripts.concat,
                     -js.delete,
                     -css,
                     -html,
                     -htmlbuildkit,
                     -imagespng,
                     -imagesjpg"/>

    <target name="-buildkit.production"
            depends="-rev,
                     -clean,
                     -prodcopy,
                     -usemin,
                     -js.all.minify,
                     -js.main.concat,
                     -js.mylibs.concat,
                     -js.scripts.concat,
                     -js.delete,
                     -strip-console.log,
                     -css,
                     -html,
                     -htmlbuildkit,
                     -imagespng,
                     -imagesjpg"/>

    <!-- Target: build -->
    <target name="-build.dev"
            depends="-rev,
                     -clean,
                     -prodcopy,
                     -imagespng,
                     -imagesjpg"/>

    <target name="-build.test"
            depends="-rev,
                     -clean,
                     -prodcopy,
                     -usemin,
                     -js.all.minify,
                     -js.main.concat,
                     -js.mylibs.concat,
                     -js.scripts.concat,
                     -js.delete,
                     -css,
                     -html,
                     -htmlclean,
                     -imagespng,
                     -imagesjpg"/>

    <target name="-build.production"
            depends="-rev,
                     -clean,
                     -prodcopy,
                     -usemin,
                     -js.all.minify,
                     -js.main.concat,
                     -js.mylibs.concat,
                     -js.scripts.concat,
                     -js.delete,
                     -strip-console.log,
                     -css,
                     -html,
                     -htmlclean,
                     -imagespng,
                     -imagesjpg"/>

    <!-- Target: minify -->
    <target name="-minify.dev"
            depends="-rev,
                     -clean,
                     -prodcopy,
                     -imagespng,
                     -imagesjpg"/>

    <target name="-minify.test"
            depends="-rev,
                     -clean,
                     -prodcopy,
                     -usemin,
                     -js.all.minify,
                     -js.main.concat,
                     -js.mylibs.concat,
                     -js.scripts.concat,
                     -js.delete,
                     -css,
                     -html,
                     -htmlcompress,
                     -imagespng,
                     -imagesjpg"/>

    <target name="-minify.production"
            depends="-rev,
                     -clean,
                     -prodcopy,
                     -usemin,
                     -js.all.minify,
                     -js.main.concat,
                     -js.mylibs.concat,
                     -js.scripts.concat,
                     -js.delete,
                     -strip-console.log,
                     -css,
                     -html,
                     -htmlcompress,
                     -imagespng,
                     -imagesjpg"/>

    <!--
    *************************************************
    * FUNCTION TARGETS                              *
    *************************************************
    -->
    <target name="-load-build-info" description="(PRIVATE) Loads the build versioning information">
        <property file="./${dir.build}/config/${build.version.info}"/>
    </target>
    
    <target name="-clean" description="(PRIVATE) Wipe the previous build (Deletes the dir.publish directory">
    <!-- This is a private target -->
    
        <echo message="Cleaning up previous build directory..."/>
        <delete dir="./${dir.publish}/"/>
    </target>
    
    
    <target name="-rev" description="(PRIVATE) Increase the current build number by one and set build date">
    <!-- This is a private target -->
    
        <echo message="====================================================================="/>
        <echo message="Welcome to the HTML5 Boilerplate Build Script!"/>
        <echo message=" "/>
        <echo message="We're going to get your site all ship-shape and ready for prime time."/>
        <echo message=" "/>
        <echo message="This should take somewhere between 15 seconds and a few minutes,"/>
        <echo message="mostly depending on how many images we're going to compress."/>
        <echo message=" "/>
        <echo message="Feel free to come back or stay here and follow along."/>
        <echo message="====================================================================="/>
        <echo message=" "/>
        <echo message=" "/>
    
    
        <echo message="Increasing the build number..."/>
        <propertyfile file="./${dir.build}/config/${build.version.info}" comment="Build Information File - DO NOT CHANGE">
            <entry key="build.number" type="int" default="0000" operation="+" pattern="0000"/>
            <entry key="build.date" type="date" value="now" pattern="dd.MM.yyyy HH:mm"/>
        </propertyfile>
        <property file="./${dir.build}/config/${build.version.info}"/>
        <echo>Creating build ${build.number}</echo>
    </target>
    
    
    <target name="current-number" depends="-load-build-info" description="(PUBLIC) Returns the current build number">
        <echo>Current build number: ${build.number}</echo>
    </target>
    
    
    <target name="-copy" depends="-load-build-info">
    <!-- This is a private target -->
    
        <echo message="Copying over new files..."/>
        <!-- combine the 2 exclude properties -->
        <var name="excluded-files" value="${file.default.exclude}, ${file.exclude}"/>

        <copy todir="./${dir.publish}">
            <fileset dir="${dir.source}/" excludes="${excluded-files}"/>
        </copy> 
        
        <echo message="A copy of all non-dev files are now in: ./${dir.publish}."/>
    </target>
	
    <target name="-prodcopy" depends="-load-build-info">
    <!-- This is a private target -->
    
        <echo message="Copying over new files..."/>
        <!-- combine the 2 exclude properties -->
        <var name="prod-excluded-files" value="${file.default.exclude}, ${file.jpg.exclude}, ${file.exclude}"/>

        <copy todir="./${dir.publish}">
            <fileset dir="${dir.source}/" excludes="${prod-excluded-files}"/>
        </copy> 
        
        <echo message="A copy of all non-dev files are now in: ./${dir.publish}."/>
    </target>
    
    
    <!-- JAVASCRIPT -->
    <target name="-js.main.concat" depends="-load-build-info" description="(PRIVATE) Concatenates the JS files in dir.js">
        <echo message="Concatenating Main JS scripts..."/>
        <concat destfile="./${dir.publish}/${dir.js}/scripts-${build.number}.js">
            <fileset dir="./${dir.publish}/">
                <include name="**/${dir.js.main}/*.min.js"/>
                <exclude name="**/${dir.js.mylibs}/*.js"/>
                <exclude name="**/${dir.js.libs}/*.js"/>
            </fileset>      
        </concat>
    </target>
    
    
    <target name="-js.mylibs.concat" depends="-load-build-info" description="(PRIVATE) Concatenates the JS files in dir.js.mylibs">
        <echo message="Concatenating JS libraries"/>
        <concat destfile="./${dir.publish}/${dir.js}/libs-${build.number}.js">
            <fileset dir="./${dir.publish}/${dir.js.mylibs}/">
                <include name="**/*.min.js"/>
            </fileset>      
        </concat>
    </target>
    
    
    <target name="-js.scripts.concat" depends="-load-build-info" if="build.concat.scripts">
        <echo message="Concatenating library file with main script file"/>
        <concat destfile="./${dir.publish}/${dir.js}/scripts-${build.number}.min.js">
            <fileset dir="./${dir.publish}/${dir.js}/">
                <include name="libs-${build.number}.js"/>
                <include name="scripts-${build.number}.js"/>
            </fileset>      
        </concat>
        
        <echo message="Concatenating library file with main debug script file"/>
        <concat destfile="./${dir.publish}/${dir.js}/scripts-${build.number}-debug.min.js">
            <fileset dir="./${dir.publish}/${dir.js}/">
                <include name="libs-${build.number}.js"/>
                <include name="scripts-${build.number}-debug.js"/>
            </fileset>      
        </concat>
    </target>
    
    
    <target name="-js.all.minify" depends="-js.libs.minify" description="(PRIVATE) Minifies the scripts.js files created by js.scripts.concat">
        <echo message="Minifying concatenated script- and library-file"/>
        <apply executable="java" parallel="false">
            <fileset dir="./${dir.publish}/${dir.js}">
                <include name="**/*.js"/>
                <exclude name="**/*.min.js"/>
            <exclude name="**/${dir.js.libs}/*.js"/>
            </fileset>
            <arg line="-jar"/>
            <arg path="./${dir.build.tools}/${tool.yuicompressor}"/>
            <srcfile/>
            <arg line="--line-break"/>
            <arg line="4000"/>
            <arg line="-o"/>
            <mapper type="glob" from="*.js" to="../${dir.publish}/${dir.js}/*.min.js"/>
            <targetfile/>
        </apply>
    </target>

    
    <target name="-js.libs.minify" depends="-load-build-info" description="(PRIVATE) Minifies the helper files in dir.js.libs">
        <echo message="Minifying helper JS files..."/>
        
        <apply executable="java" parallel="false">
            <fileset dir="./${dir.publish}/${dir.js.libs}/" includes="*.js" excludes="*.min.js"/>
            <arg line="-jar"/>
            <arg path="./${dir.build.tools}/${tool.yuicompressor}"/>
            <srcfile/>
            <arg line="-o"/>
            <mapper type="glob" from="*.js" to="../${dir.publish}/${dir.js.libs}/*-${build.number}.min.js"/>
            <targetfile/>
        </apply>
    </target>
    
    
    <target name="-js.delete" depends="-load-build-info" description="(PRIVATE) Deletes the unoptimized js files from build if set">
        <if>
            <equals arg1="${build.delete.unoptimized}" arg2="true"/>
            <then>
                <echo message="Deleting unoptimized files..."/>
                <delete file="./${dir.publish}/${dir.js}/scripts-${build.number}.js"/>
                <delete file="./${dir.publish}/${dir.js}/scripts-${build.number}-debug.js"/>
                <!--
                <delete dir="./${dir.publish}/${dir.js.lib}/"/>
                <delete file="./${dir.publish}/${dir.js}/libs-${build.number}.js"/>
                this guy probably COULD be on but I think it's better if we keep him off for now. ^pi
                <delete includeemptydirs="true">
                <fileset dir="./${dir.publish}/${dir.js.libs}/" includes="*.js" excludes="*.min.js"/>
                </delete>
                -->
            </then>
        </if>
        
        <if>
            <and>
                <equals arg1="${build.delete.unoptimized}" arg2="true"/>
                <equals arg1="${build.concat.scripts}" arg2="true"/>
            </and>
            <then>
                <delete file="./${dir.publish}/${dir.js}/libs-${build.number}.js"/>
                <delete file="./${dir.publish}/${dir.js}/scripts-${build.number}.js"/>
            </then>
        </if>
    </target>
    
    
    <target name="-strip-console.log" description="(PRIVATE)Comments out any console.log statements">
        <echo message="Commenting out console.log lines"/>


        <replaceregexp match="(console.log\(.*\))" replace="/\*\1\*/" flags="g" >
          <fileset dir="./${dir.publish}/${dir.js}/">
                <include name="**/*.js"/>
                <exclude name="**/*.min.js"/>
            </fileset>
        </replaceregexp>
    </target>
    
    
    <!-- HTML -->
    <target name="-usemin" depends="-serverconfig" description="(PRIVATE) Replaces references to non-minified scripts">
        <echo message="Switching to minified js files..."/>

        <!-- switch from a regular jquery to minified -->
        <replaceregexp match="jquery-(\d|\d(\.\d)+)\.js" replace="jquery-\1.min.js" flags="g">
            <fileset dir="./${dir.publish}" includes="${page-files}"/>
        </replaceregexp>
        <!-- switch any google CDN reference to minified -->
        <replaceregexp match="(\d|\d(\.\d)+)\/jquery\.js" replace="\1/jquery.min.js" flags="g">
            <fileset dir="./${dir.publish}" includes="${page-files}"/>
        </replaceregexp>    

        <echo>Kill off those versioning flags: ?v=2</echo>
        <replaceregexp match='\?v=\d+">' replace='">' flags="g">
            <fileset dir="./${dir.publish}" includes="${page-files}"/>
        </replaceregexp>
        
        <echo>Remove favicon.ico reference if it is pointing to the root</echo>
        <replaceregexp match="&lt;link rel=&quot;shortcut icon&quot; href=&quot;/favicon\.ico&quot;&gt;" replace="">
            <fileset dir="./${dir.publish}" includes="${page-files}"/>
        </replaceregexp>
        <!-- we maintain the apple-touch-icon reference for Android 2.2   www.ravelrumba.com/blog/android-apple-touch-icon
        <replace token="&lt;link rel=&quot;apple-touch-icon&quot; href=&quot;/apple-touch-icon.png&quot;>" value="">
            <fileset dir="./${dir.publish}" includes="${page-files}"/>
        </replace>
        -->
    </target>
    
    
    <target name="-html" depends="-load-build-info" description="(PRIVATE) Very basic clean up of the HTML">
        <echo message="Update the HTML to reference our concatenated script file: scripts-${build.number}.min.js"/>
        <!-- style.css replacement handled as a replacetoken above -->
        <replaceregexp match="&lt;!-- scripts concatenated [\d\w\s\W]*?!-- end ((scripts)|(concatenated and minified scripts))--&gt;" replace="&lt;script src='${dir.js}/scripts-${build.number}.min.js\'&gt;&lt;/script&gt;" flags="m">
            <fileset dir="./${dir.publish}" includes="${page-files}"/>
        </replaceregexp>
        <!--[! use comments like this one to avoid having them get minified -->
    </target>
    
    
    <target name="-htmlclean">
        <echo message="Run htmlcompressor on the HTML"/>
        <echo message=" - maintaining whitespace"/>
        <echo message=" - removing html comments"/>
        <echo message=" - compressing inline style/script tag contents"/>
        <apply executable="java" parallel="false" force="true" dest="./${dir.publish}/" >
            <fileset dir="./${dir.publish}/" includes="${page-files}"/>
            <arg value="-jar"/>
            <arg path="./${dir.build}/tools/${tool.htmlcompressor}"/>
            <arg line="--type html"/>
            <arg line="--preserve-multi-spaces"/>
            <arg line="--remove-quotes"/>
            <arg line="--compress-js"/>
            <arg line="--compress-css"/>
            <srcfile/>
            <arg value="-o"/>
            <mapper type="glob" from="*.html" to="../${dir.publish}/*.html"/>
            <targetfile/>
        </apply>
    </target>
    
    
    <target name="-htmlbuildkit">
        <echo message="Run htmlcompressor on the HTML"/>
        <echo message=" - maintaining whitespace"/>
        <echo message=" - retain html comments"/>
        <echo message=" - compressing inline style/script tag contents"/>
        <apply executable="java" parallel="false" force="true" dest="./${dir.publish}/" >
            <fileset dir="./${dir.publish}/" includes="${page-files}"/>
            <arg value="-jar"/>
            <arg path="./${dir.build}/tools/${tool.htmlcompressor}"/>
            <arg value="--preserve-comments"/>
            <arg line="--preserve-multi-spaces"/>
            <arg line="--type html"/>
            <arg line="--compress-js"/>
            <arg line="--compress-css"/>
            <srcfile/>
            <arg value="-o"/>
            <mapper type="glob" from="*.html" to="../${dir.publish}/*.html"/>
            <targetfile/>
        </apply>
    </target>
    
    
    <target name="-htmlcompress">
        <echo message="Run htmlcompressor on the HTML"/>
        <echo message=" - removing unnecessary whitespace"/>
        <echo message=" - removing html comments"/>
        <echo message=" - compressing inline style/script tag contents"/>
        <apply executable="java" parallel="false" force="true" dest="./${dir.publish}/" >
            <fileset dir="./${dir.publish}/" includes="${page-files}"/>
            <arg value="-jar"/>
            <arg path="./${dir.build}/tools/${tool.htmlcompressor}"/>
            <arg line="--type html"/>
            <arg line="--remove-quotes"/>
            <arg line="--compress-js"/>
            <arg line="--compress-css"/>
            <srcfile/>
            <arg value="-o"/>
            <mapper type="glob" from="*.html" to="../${dir.publish}/*.html"/>
            <targetfile/>
        </apply>
    </target>


    <target name="-serverconfig" description="(PRIVATE) Upgrades expires headers">
        <echo message="Upgrading expires header timeouts for js/css to 1yr..."/>
        <replace file="./${dir.publish}/${file.serverconfig}" token="access plus 2 months" value="access plus 1 year"/>
    </target>

    
    <!-- CSS -->
    <target name="-css" depends="-load-build-info" description="Concatenates and Minifies any stylesheets listed in the file.stylesheets property">
        <echo message="Concatenating css..."/>
        
        <concat destfile="./${dir.publish}/${dir.css}/style-${build.number}.css">
            <filelist dir="./${dir.publish}/${dir.css}" files="${stylesheet-files}"/>
        </concat>
        
        <echo message="Minifying css..."/>
        
        <apply executable="java" parallel="false">
            <fileset dir="./${dir.publish}/${dir.css}/" includes="style-${build.number}.css"/>
            <arg line="-jar"/>
            <arg path="./${dir.build.tools}/${tool.yuicompressor}"/>
            <srcfile/>
            <arg line="-o"/>
            <mapper type="glob" from="style-${build.number}.css" to="../${dir.publish}/${dir.css}/style-${build.number}.min.css"/>
            <targetfile/>
        </apply>
        
        <echo message="Updating the HTML with the new css filename"/>
        
        <replace token="style.css" value="style-${build.number}.min.css" dir="${dir.publish}" includes="${page-files}"/>
    </target>
    
    
    <!-- IMAGES -->
    <target name="-imagespng" description="(PRIVATE) Optimizes .png images using optipng">
        <echo message="Optimizing images..."/>
        <echo message="This part might take a while. But everything else is already done."/>
        <echo message=" "/>
        
        
        <echo message="First, we run optipng on the .png files..."/>
        
        <!-- osfamily=unix is actually true on OS X as well -->
        <!-- On *nix's and OS X, check for optipng and give a helpful message if it's not installed -->
        <if>
            <and>
                <os family="unix" />
                <available file="optipng" filepath="${ENV.PATH}" />
            </and>
            <then>
                <apply executable="optipng" osfamily="unix">
                    <arg value="-quiet"/>
                    <arg value="-o7"/>
                    <fileset dir="./${dir.publish}/">
                        <include name="**/*.png"/>
                    </fileset>
                </apply>
            </then>
            <elseif>
                <os family="unix" />
                <then>
                    <echo message="*** optipng NOT INSTALLED. SKIPPING OPTIMIZATION OF PNGs." />
                    <echo message="*** Install optipng to enable png optimization." />
                    <echo message="*** For instructions see 'Dependencies' at: http://html5boilerplate.com/docs/#Build-script#dependencies" />
                </then>
            </elseif>
        </if>

        <apply executable="tools/optipng-0.6.4-exe/optipng.exe" osfamily="windows">
            <arg value="-o7"/>
            <arg value="-quiet"/>
            <fileset dir="./${dir.publish}/">
                <include name="**/*.png"/>
            </fileset>
        </apply>
    </target>


    <target name="-imagesjpg" description="(PRIVATE) Optimizes .jpg images using jpegtan">
        <echo message="Now, we clean up those jpgs..."/>
        
        <!-- jpegtran is a little weird in that it assumes a pre-existing file means it's already optimized.        -->
        <!-- why? good question. To combat this, we skipped copying over the ${dir.images}/*.jpg earlier in the     -->
        <!-- copy task. Now, we're using jpegtran to copy the files over while we crunch 'em.                       -->
        
        <if>
            <equals arg1="${images.strip.metadata}" arg2="true"/>
            <then>
                <var name="strip-meta-tags" value="none"/>
            </then>
            <else>
                <var name="strip-meta-tags" value="all"/>
            </else>
        </if>

        <!-- On *nix's and OS X, check for jpegtran and give a helpful message if it's not installed -->
        <if>
            <and>
                <os family="unix" />
                <available file="jpegtran" filepath="${ENV.PATH}" />
            </and>
            <then>
                <apply executable="jpegtran" osfamily="unix">
                    <fileset dir="${dir.source}/${dir.images}" includes="*.jpg"/>
                    <arg value="-copy"/>
                    <arg value="${strip-meta-tags}"/>
                    <arg value="-optimize"/>
                    <srcfile/>
                    <redirector>
                        <outputmapper type="glob" from="*.jpg" to="./${dir.publish}/${dir.images}/*.jpg"/>
                    </redirector>
                    <!-- you may want to flag optimized images. If so, do it here. Otherwise change this to type="identity" -->
                </apply>
            </then>
            <elseif>
                <os family="unix" />
                <then>
                    <echo message="*** jpegtran NOT INSTALLED. SKIPPING OPTIMIZATION OF JPEGs." />
                    <echo message="*** Install jpegtran to enable jpeg optimization." />
                    <echo message="*** For instructions see 'Dependencies' at: http://html5boilerplate.com/docs/#Build-script#dependencies" />
                </then>
            </elseif>
        </if>

        <apply executable="tools/jpegtran.exe" osfamily="windows">
            <fileset dir="${dir.source}/${dir.images}" includes="*.jpg"/>
            <arg value="-copy"/>
            <arg value="${strip-meta-tags}"/>
            <arg value="-optimize"/>
            <srcfile/>
            <targetfile/>
            <!-- you may want to flag optimized images. If so, do it here. Otherwise change this to type="identity" -->
            <mapper type="glob" from="*.jpg" to="../${dir.publish}/${dir.images}/*.jpg"/>
        </apply>
    </target>

    
    <target name="-jpgcopy">
        <echo message="Copying over the unmodified jpegs."/>
        
        <copy todir="./${dir.publish}/${dir.images}">
            <fileset dir="${dir.source}/${dir.images}"  includes="*.jpg"/>
        </copy> 
    </target>

    
</project>