Add custom message support

.github/pr-title.yml

@@ -1 +1,2 @@
-regex: ^PR-TITLE.*$
+regex: ^PR-TITLE.*$
+message: Please correct your PR Title

app.yml

@@ -20,7 +20,7 @@ default_events:
 # - fork
 # - gollum
 # - issue_comment
-- issues
+# - issues
 # - label
 # - milestone
 # - member
@@ -32,7 +32,7 @@ default_events:
 # - project_card
 # - project_column
 # - public
-# - pull_request
+- pull_request
 # - pull_request_review
 # - pull_request_review_comment
 # - push
@@ -67,7 +67,7 @@ default_permissions:
 
   # Issues and related comments, assignees, labels, and milestones.
   # https://developer.github.com/v3/apps/permissions/#permission-on-issues
-  issues: write
+  # issues: write
 
   # Search repositories, list collaborators, and access repository metadata.
   # https://developer.github.com/v3/apps/permissions/#metadata-permissions
@@ -79,7 +79,7 @@ default_permissions:
 
   # Pull requests and related comments, assignees, labels, milestones, and merges.
   # https://developer.github.com/v3/apps/permissions/#permission-on-pull-requests
-  # pull_requests: read
+  pull_requests: write
 
   # Manage the post-receive hooks for a repository.
   # https://developer.github.com/v3/apps/permissions/#permission-on-repository-hooks

src/index.ts

@@ -3,14 +3,23 @@ import { Application } from 'probot'
 import getConfig from 'probot-config'
 
 export = (app: Application) => {
+  app.log('App Loaded')
   app.on(['pull_request.opened', 'pull_request.edited'], async (context) => {
+    context.log('Event triggered')
     const config = await getConfig(context, 'pr-title.yml');
     if (config && typeof config.regex === 'string') {
-      app.log(config.regex)
-      app.log(context.payload.pull_request)
+      context.log(config.regex)
+      const title: string = context.payload.pull_request.title;
+      if ((new RegExp(config.regex)).test(title)) {
+        context.log('No action needed')
+        return;
+      }
+      const comment = context.issue({
+        body: config.message || "Please correct your PR title"
+      })
+      context.github.issues.createComment(comment)
     } else {
-      app.log('config file not found')
+      context.log('config file not found')
     }
-
   });
 }