Allow partial update of maven plugin configuration

What problem are you trying to solve?

Partial update of maven plugin configuration

What precondition(s) should be checked before applying this recipe?

N/A

Describe the situation before applying the recipe

<plugin>
  <groupId>io.swagger</groupId>
  <artifactId>swagger-codegen-maven-plugin</artifactId>
  <version>${swagger-codegen-maven-plugin-version}</version>
  <configuration>
    <inputSpec>${project.basedir}/src/main/resources/yaml/yamlfilename.yaml</inputSpec>
    <language>com.my.package.for.v1.GeneratorLanguage</language>
    <templateDirectory>myTemplateDir</templateDirectory>
    <output>${project.build.directory}/generated-sources</output>
    <apiPackage>${default.package}.handler</apiPackage>
    <modelPackage>${default.package}.model</modelPackage>
    <invokerPackage>${default.package}.handler</invokerPackage>
  </configuration>
</plugin>

Describe the situation after applying the recipe

<plugin>
  <groupId>io.swagger</groupId>
  <artifactId>swagger-codegen-maven-plugin</artifactId>
  <version>${swagger-codegen-maven-plugin-version}</version>
  <configuration>
    <inputSpec>${project.basedir}/src/main/resources/yaml/yamlfilename.yaml</inputSpec>
    <language>com.my.package.for.v2.GeneratorLanguage</language>
    <templateDirectory>myTemplateDir</templateDirectory>
    <output>${project.build.directory}/generated-sources</output>
    <apiPackage>${default.package}.handler</apiPackage>
    <modelPackage>${default.package}.model</modelPackage>
    <invokerPackage>${default.package}.handler</invokerPackage>
  </configuration>
</plugin>

Have you considered any alternatives or workarounds?

Reuse existing ChangePluginConfiguration recipe for straightforward/static configuration.

Any additional context

The tag hierarchy could change between plugin releases or when migrating from one to another plugin. So configuration elements could be customized by the teams and should be untouched. Looking for simple add/remove capabilities for tags under plugin configuration, so partial xml can be injected/removed.

Are you interested in contributing this recipe to OpenRewrite?

yes

Start by locating the existing ChangePluginConfiguration recipe and its tests, then compare how plugin configuration elements are selected and changed. The work is done when a partial configuration can update the language element in the example while preserving the other customized elements, with tests covering the requested add/remove behavior.