通过与蚂蚁目录遍历 [英] Iterating through a directory with Ant

问题描述

让我们说我有PDF文件的集合，具有以下路径：

Let's say I have a collection of PDF files with the following paths:

/some/path/pdfs/birds/duck.pdf
/some/path/pdfs/birds/goose.pdf
/some/path/pdfs/insects/fly.pdf
/some/path/pdfs/insects/mosquito.pdf

我想要做的就是为每一个尊重的相对路径结构PDF，并输出到另一个位置，即缩略图：

What I'd like to do is generate thumbnails for each PDF that respect the relative path structure, and output to another location, i.e.:

/another/path/thumbnails/birds/duck.png
/another/path/thumbnails/birds/goose.png
/another/path/thumbnails/insects/fly.png
/another/path/thumbnails/insects/mosquito.png

我想这在Ant中完成。假设我要使用的Ghostscript在命令行上和我已经制定了调用GS：

I'd like this to be done in Ant. Assume I'm going to use Ghostscript on the command line and I've already worked out the call to GS:

    <exec executable="${ghostscript.executable.name}">
        <arg value="-q"/>
        <arg value="-r72"/>
        <arg value="-sDEVICE=png16m"/>
        <arg value="-sOutputFile=${thumbnail.image.path}"/>
        <arg value="${input.pdf.path}"/>
    </exec>

所以我需要做的是为 $ {thumbnail.image.path} 和 $ {input.pdf制定出正确的价值观。路径} 在遍历PDF输入目录。

So what I need to do is work out the correct values for ${thumbnail.image.path} and ${input.pdf.path} while traversing the PDF input directory.

我有机会获得蚂蚁的contrib（刚刚安装了最新，这是1.0b3），我使用Ant 1.8.0。我想我可以使用＆LT使一些工作;为＆GT; 任务，＆LT;文件集＆GT; 和＆LT;映射方式＆gt; S，但我无法把他们放在一起

I have access to ant-contrib (just installed the "latest", which is 1.0b3) and I'm using Ant 1.8.0. I think I can make something work using the <for> task, <fileset>s and <mapper>s, but I am having trouble putting it all together.

我想是这样的：

    <for param="file">
        <path>
            <fileset dir="${some.dir.path}/pdfs">
                <include name="**/*.pdf"/>
            </fileset>
        </path>
        <sequential>
            <echo message="@{file}"/>
        </sequential>
    </for>

但不幸的是 @ {文件} 属性是一个绝对路径，我找不到分解成相对组件的任何简单的方法。

But unfortunately the @{file} property is an absolute path, and I can't find any simple way of decomposing it into the relative components.

如果我只能做到这一点使用自定义任务，我想我可以写一个，但我希望我可以插在一起现有的组件。

If I can only do this using a custom task, I guess I could write one, but I'm hoping I can just plug together existing components.

推荐答案

在连续的任务，你可以也许能够使用的蚂蚁的contrib propertyregex ​​任务的输入路径输出映射。例如：

In the sequential task you could may be able to use the ant-contrib propertyregex task to map the input paths to output. For example:

<propertyregex override="yes" property="outfile" input="@{file}"
               regexp="/some/path/pdfs/(.*).pdf"
               replace="/another/path/\1.png" />

哪款地图，例如 /some/path/pdfs/birds/duck.pdf 到 /another/path/birds/duck.png 。

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