Add new language support

To add support for a new language you have to do the following steps:

• Check out the source code of this plugin
• Open IDEA and install the following IDEA plugins:
  • PsiViewer
  • Lombok
• Open this project in IDEA and go to the project settings
  • Set up the project SDK according to this site (you can skip all steps after Select 1.8 as the default Java SDK)
  • The Intellij Platform Plugin SDK should use a JDK 8
• now you have two options:
  • SHORT WAY (disable support for all unnecessary languages):

    • Open File → Settings and go to Build, Execution, Deployment → Compiler → Excluded

    • Exclude all sub directories of src/de/endrullis/idea/postfixtemplates/languages/ except java

    • Open the file plugin.xml and go to the line

      <codeInsight.template.postfixTemplateProvider language="JavaScript"

      and comment out all postfixTemplateProvider for languages other than Java.

  • LONG WAY (set up the full environment):

    • Install the following IDEA plugins:

      • Scala
      • Dart
      • Python
      • PHP
      • Rust

    • Close IDEA

    • Open the file $HOME/.IntelliJIdea2018.3/config/options/jdk.table and search for the Intellij Platform SDK you are using (e.g. "IntelliJ IDEA IU-183.4588.61")

    • Locate the classpath tag and the root child tag and append the following lines inside the root tag:

        <root url="jar://$APPLICATION_HOME_DIR$/plugins/JavaScriptLanguage/lib/javascript-openapi.jar!/" type="simple" />
        <root url="jar://$APPLICATION_HOME_DIR$/plugins/JavaScriptLanguage/lib/JavaScriptLanguage.jar!/" type="simple" />
        <root url="jar://$APPLICATION_HOME_DIR$/plugins/Kotlin/lib/kotlin-plugin.jar!/" type="simple" />
        <root url="jar://$APPLICATION_HOME_DIR$/plugins/Groovy/lib/Groovy.jar!/" type="simple" />
        <root url="jar://$APPLICATION_PLUGINS_DIR$/php/lib/php-openapi.jar!/" type="simple" />
        <root url="jar://$APPLICATION_PLUGINS_DIR$/python/lib/python.jar!/" type="simple" />
        <root url="jar://$APPLICATION_PLUGINS_DIR$/intellij-rust/lib/intellij-rust-0.2.0.2112-183.jar!/" type="simple" />
        <root url="jar://$APPLICATION_PLUGINS_DIR$/Dart/lib/Dart.jar!/" type="simple" />
        <root url="jar://$APPLICATION_PLUGINS_DIR$/Scala/lib/scalaUltimate.jar!/" type="simple" />
        <root url="jar://$APPLICATION_PLUGINS_DIR$/Scala/lib/scala-library.jar!/" type="simple" />
      

    • Start IDEA again

• run the plugin project in IDEA once to test if the configuration works fine
• Create the necessary folders and files for the new language (in the following I use the variables $languageId and $language as placeholders in path names and file names, whereas $language denotes the real name, e.g. SQL, and $languageId denotes just an ID for the language (usually the lower case variant), e.g. sql):

  • create the folder src/de/endrullis/idea/postfixtemplates/languages/$languageId

  • copy all classes from src/de/endrullis/idea/postfixtemplates/languages/javascript to src/de/endrullis/idea/postfixtemplates/languages/$languageId by replacing each JavaScript occurrence by your language name or camel case language name (e.g. Sql)

  • add your class ${language}Lang to the list SupportedLanguages.supportedLanguages.

  • create the folder resources/postfixTemplates/Custom${language}StringPostfixTemplate

  • copy all files from resources/postfixTemplates/CustomJavaScriptStringPostfixTemplate to resources/postfixTemplates/Custom${language}StringPostfixTemplate

  • add the following lines to the plugin.xml:

    <codeInsight.template.postfixTemplateProvider language="$language"
                                                  implementationClass="de.endrullis.idea.postfixtemplates.languages.$languageId.${language}PostfixTemplateProvider"/>
    

• Start the plugin and test if it works by opening any $language file and pressing Shift+Alt+P. If you are offered to create a new template file, the file type detection works.
• Go back to a $language file and try to apply the .example template on any expression. If it works all basic steps are done and you have an untyped postfix template support for $language.
• You can now try to add a typed postfix template support. I suggest you to install the PsiViewer plugin to analyse the different expression types in IDEA.