DO NOT REPLY [Bug 15955] New: - Add if and unless attributes to the echo task

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=15955

Add if and unless attributes to the echo task

           Summary: Add if and unless attributes to the echo task
           Product: Ant
           Version: 1.5.1
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Enhancement
          Priority: Other
         Component: Core tasks
        AssignedTo: ant-dev@jakarta.apache.org
        ReportedBy: jsalvata@atg.com


echo is often used to inform the user about presence/absence of optional
libraries and similar conditions in the build process. This is currently done by
using one target, conditioned to the appropriate property, for each message, as
in this example:

  <!--
    - Check for optional libraries.
    -->
  <target name="check-libs" description="Check availability of optional
libraries." unless="assuming.libs.present">
    <available classname="com.sun.net.ssl.internal.ssl.Provider"
property="jsse.present">
      <classpath refid="classpath"/>
    </available>
    <available classname="javax.mail.Transport" property="javamail.present">
      <classpath refid="classpath"/>
    </available>
    <available classname="javax.activation.DataHandler"
property="javamail.complete">
      <classpath refid="classpath"/>
    </available>
    <available classname="iaik.protocol.https.Handler" property="isasilk.present">
      <classpath refid="classpath"/>
    </available>
  </target>

  <!--
    - Messages for missing libraries
    -->
  <target name="ssl-message" depends="check-libs" unless="jsse.present">
    <echo message="Classes for SSL not found in classpath"/>
  </target>

  <target name="iaik-message" depends="check-libs" unless="isasilk.present">
    <echo message="Classes for IAIK iSaSiLk not found in classpath"/>
  </target>

  <target name="mail-message" depends="check-libs" unless="javamail.complete">
    <echo message="Classes for Mail support not found in classpath"/>
  </target>

  <target name="report-missing-libs"
depends="ssl-message,iaik-message,mail-message"/>

Having if & unless attributes on the echo target (with the obvious semantics)
would greatly simplify this.

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