Associate Jenkins icon with files named 'Jenkinsfile'

.gitignore

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+.idea/
+*.iml
+out/

resources/META-INF/plugin.xml

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+<idea-plugin version="2">
+  <id>com.oliverlockwood.plugins.jenkinsfile</id>
+  <name>Jenkinsfile IDEA plugin</name>
+  <version>1.0</version>
+  <vendor email="[email protected]" url="http://www.oliverlockwood.com">Oliver Lockwood</vendor>
+
+  <description><![CDATA[
+      Description for plugin.<br>
+      <em>most HTML tags may be used</em>
+      Jenkins icon under <a href="https://creativecommons.org/licenses/by-sa/3.0/">Creative Commons Attribution-ShareAlike 3.0 Unported License</a>.  See <a href="https://jenkins.io/">https://jenkins.io/</a>
+    ]]></description>
+
+  <change-notes><![CDATA[
+      Change notes for plugin.<br>
+      <em>most HTML tags may be used</em>
+    ]]>
+  </change-notes>
+
+  <!-- please see http://www.jetbrains.org/intellij/sdk/docs/basics/getting_started/build_number_ranges.html for description -->
+  <idea-version since-build="141.0"/>
+
+  <!-- please see http://www.jetbrains.org/intellij/sdk/docs/basics/getting_started/plugin_compatibility.html
+       on how to target different products -->
+  <!-- uncomment to enable plugin in all products
+  <depends>com.intellij.modules.lang</depends>
+  -->
+
+  <extensions defaultExtensionNs="com.intellij">
+    <!-- Add your extensions here -->
+    <fileTypeFactory implementation="com.oliverlockwood.plugins.jenkinsfile.JenkinsFileTypeFactory" />
+  </extensions>
+
+  <actions>
+    <!-- Add your actions here -->
+  </actions>
+
+</idea-plugin>

src/com/oliverlockwood/plugins/jenkinsfile/JenkinsFileType.java

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+package com.oliverlockwood.plugins.jenkinsfile;
+
+import com.intellij.openapi.fileTypes.LanguageFileType;
+import org.jetbrains.annotations.*;
+
+import javax.swing.*;
+
+public class JenkinsFileType extends LanguageFileType {
+    public static final JenkinsFileType INSTANCE = new JenkinsFileType();
+
+    private JenkinsFileType() {
+    super(JenkinsLanguage.INSTANCE);
+  }
+
+    @NotNull
+    @Override
+    public String getName() {
+       return "Jenkins file";
+    }
+
+    @NotNull
+    @Override
+    public String getDescription() {
+       return "Jenkins language file";
+    }
+
+    @NotNull
+    @Override
+    public String getDefaultExtension() {
+        return "";
+    }
+
+    @Nullable
+    @Override
+    public Icon getIcon() {
+        return JenkinsIcons.FILE;
+    }
+}

src/com/oliverlockwood/plugins/jenkinsfile/JenkinsFileTypeFactory.java

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+package com.oliverlockwood.plugins.jenkinsfile;
+
+import com.intellij.openapi.fileTypes.*;
+import org.jetbrains.annotations.NotNull;
+
+public class JenkinsFileTypeFactory extends FileTypeFactory {
+    @Override
+    public void createFileTypes(@NotNull FileTypeConsumer fileTypeConsumer) {
+        fileTypeConsumer.consume(JenkinsFileType.INSTANCE, new ExactFileNameMatcher("Jenkinsfile"));
+    }
+}

src/com/oliverlockwood/plugins/jenkinsfile/JenkinsIcons.java

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+package com.oliverlockwood.plugins.jenkinsfile;
+
+import com.intellij.openapi.util.IconLoader;
+
+import javax.swing.Icon;
+
+public class JenkinsIcons {
+    public static final Icon FILE = IconLoader.getIcon("/com/oliverlockwood/plugins/jenkinsfile/icons/jenkins.png");
+}

src/com/oliverlockwood/plugins/jenkinsfile/JenkinsLanguage.java

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+package com.oliverlockwood.plugins.jenkinsfile;
+
+import com.intellij.lang.Language;
+
+public class JenkinsLanguage extends Language {
+    public static final JenkinsLanguage INSTANCE = new JenkinsLanguage();
+
+    private JenkinsLanguage() {
+        super("Jenkins");
+    }
+}