Add webhook to welcome user submitting first PR to repo. Part of #1

scripts/assign-new-pr-to-review.coffee

@@ -2,13 +2,13 @@
 #   Script that listens to new GitHub pull requests
 #   and assigns them to the REVIEW column on the "Pipeline for QA" project
 
+projectBoardName = "Pipeline for QA"
+reviewColumnName = "REVIEW"
+notifyRoomName = "core"
+
 module.exports = (robot) ->
 
-  projectBoardName = "Pipeline for QA"
-  reviewColumnName = "REVIEW"
-  notifyRoomName = "core"
-
-  GitHubApi = require("github")
+  context = require("./github-context.coffee")
 
   robot.on "github-repo-event", (repo_event) ->
     githubPayload = repo_event.payload
@@ -16,21 +16,15 @@ module.exports = (robot) ->
     switch(repo_event.eventType)
       when "pull_request"
         # Make sure we don't listen to our own messages
-        return if equalsRobotName(robot, githubPayload.pull_request.user.login)
-
-        token = process.env.HUBOT_GITHUB_TOKEN
-        return console.error "No Github token provided to Hubot" unless token
+        return if context.equalsRobotName(robot, githubPayload.pull_request.user.login)
+        return console.error "No Github token provided to Hubot" unless process.env.HUBOT_GITHUB_TOKEN
 
         action = githubPayload.action
         if action == "opened"
           # A new PR was opened
-          github = new GitHubApi { version: "3.0.0" }
-          github.authenticate({
-            type: "token",
-            token: token
-          })
-
-          assignPullRequestToReview github, githubPayload, robot
+          context.initialize()
+  
+          assignPullRequestToReview context.github, githubPayload, robot
 
 assignPullRequestToReview = (github, githubPayload, robot) ->
   ownerName = githubPayload.repository.owner.login
@@ -102,21 +96,3 @@ findColumn = (columns, name) ->
   for idx, column of columns
     return column if column.name == name
   return null
-
-equalsRobotName = (robot, str) ->
-  return getRegexForRobotName(robot).test(str)
-
-RegExp cachedRobotNameRegex = null
-getRegexForRobotName = (robot) ->
-  # This comes straight out of Hubot's Robot.coffee
-  # - they didn't get a nice way of extracting that method though
-  if !cachedRobotNameRegex
-    name = robot.name.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, '\\$&')
-
-    if robot.alias
-      alias = robot.alias.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, '\\$&')
-      namePattern = "^\\s*[@]?(?:#{alias}|#{name})"
-    else
-      namePattern = "^\\s*[@]?#{name}"
-    cachedRobotNameRegex = new RegExp(namePattern, 'i')
-  return cachedRobotNameRegex

scripts/github-context.coffee

@@ -0,0 +1,36 @@
+# Description:
+#   Script that keeps GitHub-related context to be shared among scripts
+
+GitHubApi = require("github")
+
+RegExp cachedRobotNameRegex = null
+initialized = false
+github = new GitHubApi { version: "3.0.0" }
+
+module.exports.github = github
+
+module.exports.initialize = ->
+    return if initialized
+
+    initialized = true
+    github.authenticate({
+        type: "token",
+        token: process.env.HUBOT_GITHUB_TOKEN
+    })
+
+module.exports.equalsRobotName = (robot, str) ->
+    return module.exports.getRegexForRobotName(robot).test(str)
+
+module.exports.getRegexForRobotName = (robot) ->
+    # This comes straight out of Hubot's Robot.coffee
+    # - they didn't get a nice way of extracting that method though
+    if !cachedRobotNameRegex
+        name = robot.name.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, '\\$&')
+
+        if robot.alias
+            alias = robot.alias.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, '\\$&')
+            namePattern = "^\\s*[@]?(?:#{alias}|#{name})"
+        else
+            namePattern = "^\\s*[@]?#{name}"
+        cachedRobotNameRegex = new RegExp(namePattern, 'i')
+    return cachedRobotNameRegex

scripts/greet-new-contributor.coffee

@@ -0,0 +1,55 @@
+# Description:
+#   Script that listens to new GitHub pull requests
+#   and assigns them to the REVIEW column on the "Pipeline for QA" project
+
+module.exports = (robot) ->
+
+  context = require("./github-context.coffee")
+
+  robot.on "github-repo-event", (repo_event) ->
+    githubPayload = repo_event.payload
+
+    switch(repo_event.eventType)
+      when "pull_request"
+        # Make sure we don't listen to our own messages
+        return if context.equalsRobotName(robot, githubPayload.pull_request.user.login)
+        return console.error "No Github token provided to Hubot" unless process.env.HUBOT_GITHUB_TOKEN
+
+        action = githubPayload.action
+        if action == "opened"
+          # A new PR was opened
+          context.initialize()
+
+          greetNewContributor context.github, githubPayload, robot
+
+greetNewContributor = (github, githubPayload, robot) ->
+  welcomeMessage = "Thanks for making your first PR here!" # TODO: Read the welcome message from a (per-repo?) file (e.g. status-react.welcome-msg.md)
+  ownerName = githubPayload.repository.owner.login
+  repoName = githubPayload.repository.name
+  prNumber = githubPayload.pull_request.number
+  robot.logger.info "greetNewContributor - Handling Pull Request ##{prNumber} on repo #{ownerName}/#{repoName}"
+
+  github.issues.getForRepo {
+    owner: ownerName,
+    repo: repoName
+    state: 'all',
+    creator: githubPayload.pull_request.user.login
+  }, (err, ghissues) ->
+    if err
+      robot.logger.error "Couldn't fetch the user's github issues for repo: #{err}",
+        ownerName, repoName
+      return
+
+    userPullRequests = ghissues.data.filter (issue) -> issue.pull_request
+    if userPullRequests.length == 1
+      github.issues.createComment {
+        owner: ownerName,
+        repo: repoName,
+        number: prNumber,
+        body: welcomeMessage
+      }, (err, result) ->
+      if err
+        robot.logger.error "Couldn't fetch the github projects for repo: #{err}", ownerName, repoName unless err.code == 404
+      robot.logger.info "Commented on PR with welcome message", ownerName, repoName
+    else
+      robot.logger.debug "This is not the user's first PR on the repo, ignoring", ownerName, repoName, githubPayload.pull_request.user.login