add support for SCM type column in list views

Author: kamilszymanski

docs/Home.md

@@ -27,6 +27,8 @@ Browse the Jenkins issue tracker to see any [open issues](https://issues.jenkins
 
 ## Release Notes
 * 1.56 (unreleased)
+ * Enhanced support for the [Extra Columns Plugin](https://wiki.jenkins-ci.org/display/JENKINS/Extra+Columns+Plugin)
+   ([#978](https://github.com/jenkinsci/job-dsl-plugin/pull/978))
 * 1.55 (January 03 2016)
  * Updated optional
    [Config File Provider Plugin](https://wiki.jenkins-ci.org/display/JENKINS/Config+File+Provider+Plugin) dependency to

job-dsl-core/src/main/groovy/javaposse/jobdsl/dsl/views/ColumnsContext.groovy

@@ -277,4 +277,14 @@ class ColumnsContext extends AbstractExtensibleContext {
           triggerClass('hudson.triggers.SCMTrigger')
         }
     }
+
+    /**
+     * Adds a column showing the type of source code management that is used in the project.
+     *
+     * @since 1.56
+     */
+    @RequiresPlugin(id = 'extra-columns', minimumVersion = '1.4')
+    void scmType() {
+        columnNodes << new Node(null, 'jenkins.plugins.extracolumns.SCMTypeColumn')
+    }
 }

job-dsl-core/src/test/groovy/javaposse/jobdsl/dsl/views/ListViewSpec.groovy

@@ -638,6 +638,7 @@ class ListViewSpec<T extends ListView> extends Specification {
             'userName'                      | 'UserNameColumn'                         | '1.16'
             'lastConfigurationModification' | 'LastJobConfigurationModificationColumn' | '1.14'
             'workspace'                     | 'WorkspaceColumn'                        | '1.15'
+            'scmType'                       | 'SCMTypeColumn'                          | '1.4'
     }
 
     def 'build parameters column'() {