Python post-commit hook for Posting github commit URLs on Trello cards

post-commit

#!/usr/bin/env python3

# Git post-commit hook that
# parses the commit message for a trello card URL
# checks if the core "origin" url of the current repository is a github URL
# POSTs a comment on the aforementioned Trello card with a github link to the commit
# just put this file in your .git/hooks dir
# name it post-commit
# chmod +x .git/hooks/post-commit
# requires python3 and pip3 install dulwich

import os
import os.path
import re
import inspect
from dulwich.repo import Repo
import requests
import configparser

if __name__ == "__main__":
    config_file = '%s/trello.cfg' % os.path.dirname(os.path.abspath(__file__))
    if os.path.isfile(config_file):
        config = configparser.ConfigParser()
        config.read(config_file)
        trello_auth = config['Auth']
    else :
        print(inspect.cleandoc("""
            Trello config file not found.
            Get an app key from https://trello.com/app-key
            Use it to generate a token from https://trello.com/1/authorize?expiration=never&scope=read,write,account&response_type=token&name=Server%20Token&key=yourTrelloKey
            
            Create the file .git/hooks/trello.cfg
            with the following content
            
            [Auth]
            key: yourTrelloKey
            token: yourTrelloToken
              
            """))
        quit()
    
    r = Repo('.')
    config = r.get_config()
    repo_url = config.get(('remote', 'origin'), 'url').decode()
    url_match = re.match(r'.*github.com[:\/]([^\/]*)\/([^\.]+)\.git', repo_url)
    if url_match:
        project_org = url_match.group(1)
        project_name = url_match.group(2)
    else :
        quit()
        
    headHash = r.head()
    commit = r[headHash]
    match = re.match(r'.*https:\/\/trello\.com\/c\/(.+)\/([^\s]*)', commit.message.decode(), re.S)
    if match:
        card_url = "https://api.trello.com/1/cards/%s/actions/comments" % match.group(1)
        
        querystring = {
                "text":"https://github.com/%s/%s/commit/%s" % (project_org, project_name, headHash.decode()),
                "key":trello_auth['key'],
                "token":trello_auth['token']}
        
        response = requests.request("POST", card_url, params=querystring)
        
        if response.status_code == 200:
            print("Trello card https://trello.com/c/%s/%s updated\n\n" % (match.group(1), match.group(2)))
        else :
            print("There was a problem accessing the Trello API (%d)" % response.status_code)
    else :
        quit()