Add script to post Travid build errors on PRs (#1138)

scripts/post_pr_comment.py

@@ -0,0 +1,42 @@
+import json
+import os
+import sys
+import urllib2
+
+GITHUB_URL = 'https://api.github.com'
+
+def post_comment(pr_id, repo_slug, comment_body, user_token):
+	# Constructing the url
+	url = '{api_url}/repos/{slug}/issues/{number}/comments'.format(
+        api_url=GITHUB_URL, slug=repo_slug, number=pr_id)
+	req = urllib2.Request(url=url,
+                       data=json.dumps({'body': comment_body}))
+	req.add_header('Authorization', 'token ' + user_token)
+	# Making the request
+	f = urllib2.urlopen(req)
+	if f.getcode() != 201:
+		print f.read()
+
+
+# Get the environment variables
+PR_NUMBER = os.environ.get('TRAVIS_PULL_REQUEST')
+REPO_SLUG = os.environ.get('TRAVIS_REPO_SLUG') # owner_name/repo_name
+BOT_TOKEN = os.environ.get('TRAVIS_BOT_GITHUB_TOKEN')
+BUILD_ID = os.environ.get('TRAVIS_BUILD_ID')
+
+# Read the test result output from stdin
+test_result = sys.stdin.read().strip()
+# Populate the template text
+comment = (
+"The [build]"
+"(https://travis-ci.org/tldr-pages/tldr/builds/{build_id})"
+" for this PR has failed with the following message:"
+"\n```\n"
+"{comment_body}"
+"\n```\n"
+"Please fix the error(s) and push again."
+).format(build_id=BUILD_ID, comment_body=test_result)
+
+# If its a PR, post a comment on it
+if PR_NUMBER != "false":
+	post_comment(PR_NUMBER, REPO_SLUG, comment, BOT_TOKEN)