如何使用Ant'输入'任务读取多行值？

Anyone know how I can enter a multiline value in an Ant script? I'm prompting the user for a Subversion commit comment using the input task, and I'd like to be able to support multiple lines of text.

任何人都知道如何在Ant脚本中输入多行值?我正在使用输入任务提示用户进行Subversion提交注释,我希望能够支持多行文本。

I'm running the standalone version of Ant at the Windows command prompt.

我在Windows命令提示符下运行Ant的独立版本。

I thought I might be able to do a search and replace for \n, but I can't see any easy way to do a replace from property value to property value in Ant. It looks like I'd have to write a file, replace in the file, and then load the file into another property. I don't want it that badly.

我以为我可能能够进行搜索并替换\ n,但是我看不到任何简单的方法来在Ant中将属性值替换为属性值。看起来我必须写一个文件,替换文件,然后将文件加载到另一个属性。我不是那么想要它。

1 个解决方案

#1

I'm not 100% positive about this, but I took a look at the Ant source code, and it just does a readLine():

我对此并不是100%肯定,但我看了一下Ant源代码,它只是执行readLine():

From /org/apache/tools/ant/input/DefaultInputHandler.java:

/**
 * Prompts and requests input.  May loop until a valid input has
 * been entered.
 * @param request the request to handle
 * @throws BuildException if not possible to read from console
 */
public void handleInput(InputRequest request) throws BuildException {
    String prompt = getPrompt(request);
    BufferedReader r = null;
    try {
        r = new BufferedReader(new InputStreamReader(getInputStream()));
        do {
            System.err.println(prompt);
            System.err.flush();
            try {
                String input = r.readLine();
                request.setInput(input);
            } catch (IOException e) {
                throw new BuildException("Failed to read input from"
                                         + " Console.", e);
            }
        } while (!request.isInputValid());
    } finally {
        if (r != null) {
            try {
                r.close();
            } catch (IOException e) {
                throw new BuildException("Failed to close input.", e);
            }
        }
    }
}

Here is what I would do if I were you:

如果我是你,我会怎么做:

If you are using Ant 1.7, then try implementing your own InputHandler, as described in the documentation. The Apache License permits you to basically copy-and-paste the above code as a starting point.

如果您使用的是Ant 1.7,请尝试实现自己的InputHandler,如文档中所述。 Apache许可证允许您基本上复制并粘贴上述代码作为起点。

If you are using Ant 1.6 or earlier, then just create your own MultiLineInput task. You can extend the existing Input class and just read multiple lines.

如果您使用的是Ant 1.6或更早版本,那么只需创建自己的MultiLineInput任务即可。您可以扩展现有的Input类,只读取多行。

In either case, you would need to decide how the user indicates "I'm done." You could use a blank line or a period or something.

在任何一种情况下,您都需要决定用户如何表明“我已经完成了”。您可以使用空行或句号等。

Good luck!

P.S. When I did a Google search for "ant multi-line input", this page was the first hit :-). Pretty impressive for a question that was asked less than an hour ago.

附:当我在谷歌搜索“蚂蚁多行输入”时,这个页面是第一个打击:-)。对于一个不到一小时前被问到的问题,令人印象深刻。

#1