只有在源文件被修改的情况下，如何执行 Ant 任务? [英] How to execute an Ant task only when source files have been modified?

问题描述

必须有一个简单的方法来做到这一点.我使用依赖于 SWC 库的 ant 构建了一个 Flex 应用程序，除了它是否需要重建库之外，它工作正常.如果库的任何源文件(*.as、*.mxml)比 SWC 更新，我如何告诉 ant 只运行任务?

There must be an easy way to do this. I build a Flex app using ant that depends on a SWC library, which works fine except that it rebuilds the library whether it needs to or not. How do I tell ant to only run the task if any of the sources files of the library (*.as, *.mxml) are newer than the SWC?

我看过 <dependset> 但它似乎只是删除文件，而不是确定是否应该运行任务.<depend> 似乎期望源文件和目标文件之间存在一对一的关系，而不是一对多的关系——我有许多输入文件和一个输出文件，但没有中间目标文件.

I've looked at <dependset> but it only seems to delete files, not determine whether a task should be run or not. <depend> seems to expect a one-to-one relationship between the source and target files rather than a one-to-many relationship -- I have many input files and one output file, but no intermediate object files.

非常感谢，亚历克斯

推荐答案

您可以使用 Ant 更新任务来创建一个属性，并且仅在设置了该属性时才执行您的其他目标.

You may use the Ant uptodate task to create a property, and execute your other target only if that property is set.

我对 flex 了解不多，但您可能想要这样的东西:

I don't know much about flex, but you probably want something like this:

<?xml version="1.0" encoding="UTF-8"?>
<project name="test" default="compile">

   <target name="checkforchanges">
      <uptodate property="nochanges">
         <srcfiles dir="." includes="**/*.as"/>
         <srcfiles dir="." includes="**/*.mxml"/>
         <mapper to="applicaton.flex"/>
      </uptodate>
   </target>

   <target name="compile" depends="checkforchanges" unless="nochanges">
      ...
   </target>

</project>

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