Add support for GitLab Branch Source plugin

job-dsl-core/src/main/docs/examples/javaposse/jobdsl/dsl/helpers/workflow/BranchSourcesContext/gitlab.groovy

@@ -0,0 +1,11 @@
+multibranchPipelineJob('example') {
+    branchSources {
+        gitlab {
+            id('23232323') // IMPORTANT: use a constant and unique identifier
+            serverName('GitLab')
+            credentialsId('gitlab-ci')
+            projectOwner('ownerName')
+            projectPath('ownerName/projectName')
+        }
+    }
+}

job-dsl-core/src/main/groovy/javaposse/jobdsl/dsl/helpers/workflow/BranchSourcesContext.groovy

@@ -79,6 +79,30 @@ class BranchSourcesContext extends AbstractExtensibleContext {
         }
     }
 
+    /**
+     * Adds a GitLab branch source. Can be called multiple times to add more branch sources.
+     */
+    @RequiresPlugin(id = 'gitlab-branch-source', minimumVersion = '670.vf7df45517001')
+    void gitlab(@DslContext(GitLabBranchSourceContext) Closure branchSourceClosure) {
+        GitLabBranchSourceContext context = new GitLabBranchSourceContext(jobManagement)
+        ContextHelper.executeInContext(branchSourceClosure, context)
+
+        Preconditions.checkNotNullOrEmpty(context.id, 'id must be specified')
+
+        branchSourceNodes << new NodeBuilder().'jenkins.branch.BranchSource' {
+            source(class: 'io.jenkins.plugins.gitlabbranchsource.GitLabSCMSource') {
+                id(context.id)
+                serverName(context.serverName ?: '')
+                credentialsId(context.credentialsId ?: '')
+                projectOwner(context.projectOwner ?: '')
+                projectPath(context.projectPath ?: '')
+            }
+            strategy(class: 'jenkins.branch.DefaultBranchPropertyStrategy') {
+                properties(class: 'empty-list')
+            }
+        }
+    }
+
     @Override
     protected void addExtensionNode(Node node) {
         branchSourceNodes << node

job-dsl-core/src/main/groovy/javaposse/jobdsl/dsl/helpers/workflow/GitLabBranchSourceContext.groovy

@@ -0,0 +1,51 @@
+package javaposse.jobdsl.dsl.helpers.workflow
+
+import javaposse.jobdsl.dsl.AbstractContext
+import javaposse.jobdsl.dsl.JobManagement
+
+class GitLabBranchSourceContext extends AbstractContext {
+    String id
+    String serverName
+    String credentialsId
+    String projectOwner
+    String projectPath
+
+    GitLabBranchSourceContext(JobManagement jobManagement) {
+        super(jobManagement)
+    }
+
+    /**
+     * Specifies a unique ID for this branch source.
+     */
+    void id(String id) {
+        this.id = id
+    }
+
+    /**
+     * Sets the defined connection to GitLab server.
+     */
+    void serverName(String serverName) {
+        this.serverName = serverName
+    }
+
+    /**
+     * Sets checkout credentials for authentication with GitLab.
+     */
+    void credentialsId(String credentialsId) {
+        this.credentialsId = credentialsId
+    }
+
+    /**
+     * Sets the name of the GitLab Group or GitLab User.
+     */
+    void projectOwner(String projectOwner) {
+        this.projectOwner = projectOwner
+    }
+
+    /**
+     * Sets the full path of the GitLab project.
+     */
+    void projectPath(String projectPath) {
+        this.projectPath = projectPath
+    }
+}

job-dsl-core/src/test/groovy/javaposse/jobdsl/dsl/helpers/workflow/BranchSourcesContextsSpec.groovy

@@ -190,4 +190,75 @@ class BranchSourcesContextsSpec extends Specification {
         }
         1 * jobManagement.requireMinimumPluginVersion('github-branch-source', '1.8')
     }
+
+    def 'gitlab with missing id'() {
+        when:
+        context.gitlab {}
+
+        then:
+        Exception e = thrown DslException
+        e.message =~ 'id must be specified'
+    }
+
+    def 'gitlab with minimal options'() {
+        when:
+        context.gitlab {
+            id('test')
+        }
+
+        then:
+        context.branchSourceNodes.size() == 1
+        with(context.branchSourceNodes[0]) {
+            name() == 'jenkins.branch.BranchSource'
+            children().size() == 2
+            with(source[0]) {
+                children().size() == 5
+                id[0].value() == 'test'
+                serverName[0].value().empty
+                credentialsId[0].value().empty
+                projectOwner[0].value().empty
+                projectPath[0].value().empty
+            }
+            with(strategy[0]) {
+                children().size() == 1
+                attribute('class') == 'jenkins.branch.DefaultBranchPropertyStrategy'
+                properties[0].value() == []
+                properties[0].attribute('class') == 'empty-list'
+            }
+        }
+        1 * jobManagement.requireMinimumPluginVersion('gitlab-branch-source', '670.vf7df45517001')
+    }
+
+    def 'gitlab with all options'() {
+        when:
+        context.gitlab {
+            id('test')
+            serverName('GitLab')
+            credentialsId('checkoutCreds')
+            projectOwner('ownerName')
+            projectPath('ownerName/projectName')
+        }
+
+        then:
+        context.branchSourceNodes.size() == 1
+        with(context.branchSourceNodes[0]) {
+            name() == 'jenkins.branch.BranchSource'
+            children().size() == 2
+            with(source[0]) {
+                children().size() == 5
+                id[0].value() == 'test'
+                serverName[0].value() == 'GitLab'
+                credentialsId[0].value() == 'checkoutCreds'
+                projectOwner[0].value() == 'ownerName'
+                projectPath[0].value() == 'ownerName/projectName'
+            }
+            with(strategy[0]) {
+                children().size() == 1
+                attribute('class') == 'jenkins.branch.DefaultBranchPropertyStrategy'
+                properties[0].value() == []
+                properties[0].attribute('class') == 'empty-list'
+            }
+        }
+        1 * jobManagement.requireMinimumPluginVersion('gitlab-branch-source', '670.vf7df45517001')
+    }
 }