IntelliJ: How to support customized Cucumber feature file extension

Requirement

as a heavy user of Cucumber, I created customized feature file (e.g. .feature2) for my enhancment. I want to add support to customized feature file with IntelliJ and Cucumber plugin.

Solutions

Solution 1: configuring IntellJ

config IntelliJ: Settings > File Types, register customized patterns: e.g. *.feature2

Solution 2: customizing cucumber plugin

the IntelliJ Cucumber plugin is created by JetBrains with ‘Apache License 2.0’

so we can download, modify, redistribute it.

before you proceed to downloading, you may want to select the brache with your IntellJ version.

Step 1. Override the CucumberFileTypeFactory instead of modifying the original code CucumberFileTypeFactory, I prefer to extend it:

package aqua;

import com.intellij.openapi.fileTypes.ExtensionFileNameMatcher;
import com.intellij.openapi.fileTypes.FileTypeConsumer;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.plugins.cucumber.psi.CucumberFileTypeFactory;
import org.jetbrains.plugins.cucumber.psi.GherkinFileType;

public class AquaFileTypeFactory extends CucumberFileTypeFactory{
    @Override
    public void createFileTypes(@NotNull FileTypeConsumer consumer) {
        consumer.consume(GherkinFileType.INSTANCE, new ExtensionFileNameMatcher("feature"), new ExtensionFileNameMatcher("feature2"));
    }
}

Step 2. Register the FileTypeFactory created in Step 1 in `src/META-INF/plugin.xml

<idea-plugin version="2">
    <id>gherkin</id> <!-- I prefer to keep this id so that other plugins can continue to depend on it -->
    <name>Gherkin-AQUA</name>
    <fileTypeFactory implementation="aqua.AquaFileTypeFactory"/>
</idea-plugin>

then you may build your plugin redistribute it!