pre-push.py

#!/usr/bin/env python3
import sys
import platform
import subprocess

clear_screen_command = 'cls' if platform.system() == 'Windows' else 'clear'
subprocess.call(clear_screen_command)

# Checking for not staged files, if there's files pending, exit the script
git_command = ['git', '--no-pager', 'status', '-s']
execute = subprocess.run(git_command, stdout=subprocess.PIPE)
modified_files = execute.stdout \
 .decode('utf-8') \
 .split('\n')
modified_files = [ file[3:] for file in modified_files if file ]

if len(modified_files):
 print('Files have been found in the work area, please stash or commit them first and run this command again.\n')
 sys.exit(1)

for line in sys.stdin:
 git_params = line.replace('\n','') \
 .split(' ')

 # This will be 40 zeroes when we're trying to push in a new branch
 empty_sha = '0' * 40
 local_sha = git_params[1]
 remote_sha = None if git_params[3] == empty_sha else git_params[3]

 git_command = ['git', '--no-pager', 'diff', '--name-only', local_sha, remote_sha]
 execute = subprocess.run(git_command, stdout=subprocess.PIPE)
 modified_files = execute.stdout \
 .decode('utf-8') \
 .split('\n')

 # Gather all the unique extensions for modified files in order to execute the configured commands
 modified_extensions = list(set(
 [ file.split('.')[-1] for file in modified_files if len(file.split('.')) > 1 ]
 ))

 for extension in modified_extensions:
 extension_config = 'pre-push.{}.command'.format(extension)
 git_command = ['git', 'config', extension_config]
 execute = subprocess.run(git_command, stdout=subprocess.PIPE)
 pre_push_pipeline = execute.stdout \
 .decode('utf-8') \
 .replace('\n', '') \
 .split(';')
 pre_push_pipeline = [pipeline_command.strip() for pipeline_command in pre_push_pipeline]

 for pipeline_command in pre_push_pipeline:
 if pipeline_command is not '':
 print(' [{ext}] "{cmd}" '.format(ext=extension, cmd=pipeline_command).center(80, '='))
 git_command = pipeline_command.split(' ')
 execute = subprocess.call(git_command)

 if execute:
 print('\n' * 2)
 print('Aborting push because [{cmd}] is returning a non-zero value'.format(cmd=pipeline_command))
 sys.exit(execute)
 print('\n' * 2)

sys.exit(0)