Gradle Replace text in jsp using filter

Question

I have a jsp that contains a css link that looks like

<link type="text/css" href="/css/login-min.css" rel="stylesheet" />

In order to keep browsers from caching the css file we replace login-min.css with the name of the css and a timestamp or version number

login-min.css?t=432432423423...

In ant I would do something like

<tstamp>
  <format property="current.time" pattern="MMddyyyyhhmmssaa" offset="-5" unit="hour" />
</tstamp>

<replace dir="${deploy.path}/${name}/WEB-INF/jsp" value="login-min.css?t=${current.time}">
  <include name="includes/login_css_include.jsp" />
  <replacetoken>login-min.css</replacetoken>
</replace>

For gradle I've updated the jsp page to look like

<link type="text/css" href="/css/@loginCSS@" rel="stylesheet" />

and in the build.gradle am doing

import org.apache.tools.ant.filters.ReplaceTokens
war {
  webInf {
    from ("${webAppDir}/WEB-INF/jsp") {
      include: "/includes/login_css_include.jsp"
      filter(ReplaceTokens, tokens: [loginCSS: 'login-min.css?v=1'])
    }
  }
}

but this isn't working.

This one works but it changes the source... I just want the files in the war to be modified.

import org.apache.tools.ant.filters.ReplaceTokens
war {
  webInf {
    from ("${webAppDir}/WEB-INF/jsp/includes/login_css_include.jsp") {
      it.eachFile {
        ant.replace(file: it.file, token: "@loginCSS@", value: "login-min.css?v=1")
      }
    }
  }
}

I'm brand new to gradle am I going about this totally incorrectly? Anyone needed to do something like this before? Using gradle 1.0-milestone-1.

Thanks

Answer 1

Ok, this seems to work:

jsp page:

<link type="text/css" href="/css/@loginCSS@" rel="stylesheet" />

build.gradle:

war {
   filter(ReplaceTokens, tokens: ['loginCSS': 'login-min.css'])
}

Answer 2

Yet another variant to try out (it works in my case to overcome this bug http://issues.gradle.org/browse/GRADLE-1566#)

war {   
   eachFile {
      if (it.name == 'yourFile.jsp') {
        it.filter(org.apache.tools.ant.filters.ReplaceTokens, tokens: [...])
      }
   }
}

Answer 3

Not sure if this fits with the groovy/gradle style this is how I was able to accomplish this.

jsp file now looks like this:

<link type="text/css" href="/css/${loginCSS}" rel="stylesheet" />

and the gradle.build like this:

war {
  eachFile {
    if (it.name == 'login_css_include.jsp') {
      it.expand(loginCSS: "login-min.css?v=1")
    }
  }
}

Utilizing a timestamp looks like this:

war {
  eachFile {
    if (it.name == 'login_css_include.jsp') {
      def now = new Date()
      it.expand(loginCSS: "login-min.css?t=${now.getTime()}")
    }
  }
}

Edit - as Axel points out below in the comments, this solution has trouble when it runs across binary files or files with JSP EL expressions.