git-remote-link

#!/usr/bin/env python2

"""Output a link to a particular file+line in a remote repository.

Right now this works only for repos downstream from github."""

from __future__ import print_function
import os
import sys
import argparse
import subprocess
import re

def get_filename_and_lineno(args):
    split = args.file.split(':')
    if len(split) > 2:
        print('Too many ":"s in filename %s; max is 1', file=sys.stderr)
        sys.exit(1)
    filename = split[0]
    if len(split) == 1:
        lineno = 0
    else:
        try:
            lineno = int(split[1])
        except:
            print('Value in filename after ":" must be an integer.', file=sys.stderr)
    return (filename, lineno)

def git(*args):
    return subprocess.check_output(['git'] + list(args)).strip()

def main(args):
    (filename, lineno) = get_filename_and_lineno(args)
    gitdir = git('rev-parse', '--show-toplevel')
    rel_filename = os.path.relpath(os.path.abspath(filename), gitdir)

    upstream_branch = git('tracks')
    upstream_repo = upstream_branch.split('/')[0] 

    remote_info = git('remote', 'show', '-n', upstream_repo)
    fetch_line = remote_info.split('\n')[1]
    fetch_url = re.match('\s*Fetch URL:\s*(.*)', fetch_line).group(1)
    
    # github ssh URL --> https URL
    fetch_url = re.sub('^git@github.com:', 'https://github.com/', fetch_url)

    fetch_url = re.sub('^git://', 'https://', fetch_url)

    # Strip off trailing .git
    base_url = re.sub('.git$', '', fetch_url)

    upstream_commit = git('qparent')

    url = '%s/tree/%s/%s' % (base_url, git('qparent'), rel_filename)
    if lineno:
        url = '%s#L%d' % (url, lineno)
    print(url)

if __name__ == '__main__':
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument('file', metavar='FILE',
                        help='Either path/to/file or path/to/file:lineno')
    args = parser.parse_args()
    main(args)