Jenkinsfile: add mattermost notifications

Jenkinsfile

@@ -1,10 +1,51 @@
-node {
-  stage 'Checkout'
-  checkout scm
-  
-  stage 'Build'
-  sh "make V=s"
-  
-  stage 'Archive'
-  archive 'output/**/*'
+def _pipelineNotify(String buildStatus = 'STARTED') {
+    // build status of null means successful
+    buildStatus =  buildStatus ?: 'SUCCESSFUL'
+
+    // Default values
+    def colorName = 'RED'
+    def colorCode = '#FF0000'
+    def subject = "${buildStatus}: Job '${env.JOB_NAME} [${env.BUILD_NUMBER}]'"
+    def summary = "${subject} (${env.BUILD_URL})"
+
+    // Override default values based on build status
+    if (buildStatus == 'STARTED') {
+        color = 'YELLOW'
+        colorCode = '#FFFF00'
+    } else if (buildStatus == 'SUCCESSFUL') {
+        color = 'GREEN'
+        colorCode = '#00FF00'
+    } else {
+        color = 'RED'
+        colorCode = '#FF0000'
+    }
+
+    try {
+        mattermostSend (color: colorCode, message: summary)
+    }
+    catch (e) {
+        echo 'Unable to sent Mattermost notification'
+    }
+}
+
+node {
+  try {
+      _pipelineNotify()
+
+      stage 'Checkout'
+      checkout scm
+
+      stage 'Build'
+      sh "make V=s"
+
+      stage 'Archive'
+      archive 'output/**/*'
+  }
+  catch (e) {
+      currentBuild.result = "FAILED"
+      throw e
+  }
+  finally {
+      _pipelineNotify(currentBuild.result)
+  }
 }