如何在 ant(1) 中执行 makefile(4) 规则？

发布于 2024-09-08 08:05:02 字数 368 浏览 0 评论 0原文

我想知道如何在 ant(1) 中执行相当于特定 makefile(4) 规则的操作。 makefile(4) 规则执行以下操作： 1) 启动一个不会终止的进程，并将一行写入其标准输出流； 2）从进程中读取行； 3) 使用该行构造一个文件； 4) 使用该文件作为参数启动第二个进程，该进程不会终止。概括地说，makefile(4) 规则是

program1 | while read arg; do \
    echo $$arg >file; \
    program2 file; \
done

注意：“program1”写入一行； “program1”和“program2”都不会终止。

在 ant(1) 中如何做到这一点？

原文

I would like to know how to do something in ant(1) that's equivalent to a particular makefile(4) rule. The makefile(4) rule does the following: 1) starts a process that doesn't terminate and that writes one line to its standard output stream; 2) reads the line from the process; 3) constructs a file using the line; and 4) starts a second process that doesn't terminate using the file as an argument. Schematically, the makefile(4) rule is

program1 | while read arg; do \
    echo $arg >file; \
    program2 file; \
done

NOTE: "program1" writes one line; neither "program1" nor "program2" terminates.

How can this be done in ant(1)?

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魔法唧唧 2024-09-15 08:05:03

您应该能够使用 ProcessBuilder 如下所述：

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class PBTest {

    public static void main(String[] args) {
        ProcessBuilder pb = new ProcessBuilder("process1");
        pb.redirectErrorStream(true);
        try {
            Process p = pb.start();
            String s;
            // read from the process's combined stdout & stderr
            BufferedReader stdout = new BufferedReader (
                new InputStreamReader(p.getInputStream()));
            if ((s = stdout.readLine()) != null) {
                ProcessBuilder pb2 = new ProcessBuilder("process2", s);
                pb2.start();
                ...
            }
            System.out.println("Exit value: " + p.waitFor());
            p.getInputStream().close();
            p.getOutputStream().close();
            p.getErrorStream().close();
         } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

然后您的 java任务相当简单：

<!-- Run the program -->
<target name="run">
    <java classname="PBTest" fork="true"></java> 
</target>

附录：

我正在 ant(1) 而不是 Java 中寻找解决方案。

您可以在 脚本任务。我没有看到直接使用标准输入和输出的方法，但您可以使用 loadfile 任务从文件加载属性。下面是一个从源文件获取版本号的示例。

You should be able to use ProcessBuilder as outlined below:

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class PBTest {

    public static void main(String[] args) {
        ProcessBuilder pb = new ProcessBuilder("process1");
        pb.redirectErrorStream(true);
        try {
            Process p = pb.start();
            String s;
            // read from the process's combined stdout & stderr
            BufferedReader stdout = new BufferedReader (
                new InputStreamReader(p.getInputStream()));
            if ((s = stdout.readLine()) != null) {
                ProcessBuilder pb2 = new ProcessBuilder("process2", s);
                pb2.start();
                ...
            }
            System.out.println("Exit value: " + p.waitFor());
            p.getInputStream().close();
            p.getOutputStream().close();
            p.getErrorStream().close();
         } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

Then your java task is fairly straightforward:

<!-- Run the program -->
<target name="run">
    <java classname="PBTest" fork="true"></java> 
</target>

Addendum:

I'm looking for a solution in ant(1) rather than Java.

You can use any Apache BSF or JSR 223 supported language in the script task. I don't see a way to use standard input and output directly, but you can use the loadfile task to load a property from a file. Here's an example that obtains a version number from a source file.

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