Add preliminary Maven goals to invoke from the pre-commit script

[duke1995]

Make it possible to configure preliminary Maven goals that should be invoked before invoking the main git-code-format:on-pre-commit goal from the pre-commit script.

See also: Cannot use multiple sourceDirectories · Issue #52 · Cosium/git-code-format-maven-plugin

[reda-alaoui]

Please add an automated test

[duke1995]

Hello @reda-alaoui

I have no experience writing a Maven plugin, and therefore no experience writing a proper test for it either.

For the PoC, I based my changes on the code that already exists in the project right now, in particular on the code for the propertiesToAdd config property. However, I don't find a specific test for the propertiesToAdd config property (or one of the other config properties) which I could use as a starting point for a test for the new config property (but maybe I overlooked it).

I only did a manual test by doing a mvn clean install of my feature branch and using that new SNAPSHOT version of the plugin on a test project to verify the generated pre-commit script.

  <properties>
    <git-code-format-maven-plugin.version>6.1-SNAPSHOT</git-code-format-maven-plugin.version>
  </properties>

  <build>
    <plugins>
      <plugin>
        <groupId>com.cosium.code</groupId>
        <artifactId>git-code-format-maven-plugin</artifactId>
        <version>${git-code-format-maven-plugin.version}</version>
        <dependencies>
          <!-- Enable https://github.com/google/google-java-format -->
          <dependency>
            <groupId>com.cosium.code</groupId>
            <artifactId>google-java-format</artifactId>
            <version>${git-code-format-maven-plugin.version}</version>
          </dependency>
        </dependencies>
        <configuration>
          <preliminaryGoals>
            <preliminaryGoal>build-helper:add-test-source@add-integration-test-source</preliminaryGoal>
            <preliminaryGoal>build-helper:add-test-source@add-acceptance-test-source</preliminaryGoal>
          </preliminaryGoals>
          <!-- enable hook execution verbose mode -->
          <!-- <propertiesToAdd>
          <prop>-X</prop>
        </propertiesToAdd> -->
        </configuration>
      </plugin>
    </plugins>
  </build>

With the above config, the contents of the generated pre-commit script is as follows:

#!/bin/bash
set -e
"C:/dev/java/maven/default/bin/mvn.cmd" -f "C:/dev/prj/my-group/my-project/pom.xml" build-helper:add-test-source@add-integration-test-source build-helper:add-test-source@add-acceptance-test-source com.cosium.code:git-code-format-maven-plugin:on-pre-commit 

Kind regards.