在 maven-antrun-plugin 中调用 foreach [英] Calling foreach in maven-antrun-plugin

问题描述

我正在尝试设置 maven 以在我的 Web 项目中的目录上执行 LESS CSS 预处理器.基本流程是:

I'm trying to set up maven to execute the LESS CSS preprocessor on a directory in my web project. The basic flow is:

1. Maven 调用 maven-antrun-plugin.
2. Ant-contrib 循环遍历一个目录并找到所有 .less 文件并调用一个目标.
3. 目标执行 Rhino，后者执行 LESS 以转换文件.

1. Maven calls maven-antrun-plugin.
2. Ant-contrib <foreach/> loops through a directory and finds all the .less files and calls a target.
3. The target executes Rhino, which executes LESS which converts the file.

为此，我有以下 XML:

To do this, I have the following XML:

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-antrun-plugin</artifactId>
            <version>1.7</version>
            <executions>
                <execution>
                    <phase>compile</phase>
                    <configuration>
                        <target name="processLessFile">
                            <!-- ... -->
                        </target>
                        <target name="main">
                            <taskdef resource="net/sf/antcontrib/antcontrib.properties" classpathref="maven.plugin.classpath"/>
                            <property name="css.dir" location="src/main/webapp/css"/>
                            <foreach param="file" target="processLessFile">
                                <fileset dir="${css.dir}">
                                    <filename name="**/*.less" />
                                </fileset>
                            </foreach>
                        </target>
                    </configuration>
                    <goals>
                        <goal>run</goal>
                    </goals>
                </execution>
            </executions>
            <dependencies>
                <dependency>
                    <groupId>ant</groupId>
                    <artifactId>ant-contrib</artifactId>
                    <version>1.0b2</version>
                </dependency>
            </dependencies>
        </plugin>

我遇到的问题是主要"目标开始执行但随后在 中失败:

The problem I'm encountering is that the "main" target starts to execute but then fails in <foreach>:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-antrun-plugin:1.7:run (default) on project model-web-project: An Ant BuildException has occured: The following error occurred while executing this line:
[ERROR] /Users/.../pom.xml:4: Unexpected element "{http://maven.apache.org/POM/4.0.0}project" {antlib:org.apache.tools.ant}project
[ERROR] around Ant part ...<foreach param="file" target="processLessFile">... @ 6:50 in /Users/.../target/antrun/build-main.xml
[ERROR] -> [Help 1]

看起来 Ant 中的某些东西导致它尝试读取 POM 文件，可能是在寻找目标.我看到这两个目标都生成到文件 target/antrun/build-main.xml 和 target/antrun/build-processLessFile.xml 中，所以这是它应该查找的目录.

It appears that something in Ant is causing it to try read the POM file, possibly looking for the target. I see that both targets were generated into files target/antrun/build-main.xml and target/antrun/build-processLessFile.xml so that is the directory it should be looking in.

推荐答案

ant 插件似乎不支持多个目标部分的声明.您可以检查生成的 ANT 脚本以了解我在说什么:

The ant plugin does not appear to support the declaration of more than one target section. You can check the generated ANT script to see what I'm talking about:

target/antrun/build-main.xml

深入挖掘插件文档声明如下:

此插件的目的不是提供污染 POM 的方法，因此鼓励将所有 Ant 任务移动到 build.xml 文件，并使用 Ant 任务从 POM 中调用它.

It is not the intention of this plugin to provide a means of polluting the POM, so it's encouraged to move all your Ant tasks to a build.xml file and just call it from the POM using Ant's task.

措辞严厉，但建议是合理的.我建议将您的 ANT 逻辑移动到一个专用文件中并按如下方式调用它:

Harsh words, but the advice is sound. I'd recommend moving your ANT logic into a dedicated file and invoke it as follows:

        <plugin>
            <artifactId>maven-antrun-plugin</artifactId>
            <version>1.7</version>
            <executions>
                <execution>
                    <phase>compile</phase>
                    <configuration>
                        <target>
                            <ant antfile="${basedir}/src/main/ant/build.xml"/>
                        </target>
                    </configuration>
                    <goals>
                        <goal>run</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>

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