prepare-commit-msg

#!python

from __future__ import print_function
from hooks_common import *

def build_commit_message(original_raw, feature_name, issue, warnings):

    lines = original_raw.splitlines()
    original = "\n".join([l for l in lines if not l.strip().startswith("#")])
    comments = "\n".join([l for l in lines if l.strip().startswith("#")])

    prefix_string = "({0}) ".format(feature_name)
    issue_string = "\n{0}".format(issue)

    message = ""
    if feature_name != None and not original.startswith(prefix_string):
        message += prefix_string
    message += original + "\n"
    if issue != None and not original.endswith(issue_string):
        message += issue_string + "\n"
    for w in warnings:
        message += "# " + w.replace("\n", "\n# ") + "\n# \n"
    message += comments + "\n"
    return message

# Don't alter '--amend' messages, merges, cherry-picks
if len(sys.argv) > 2 and ( (sys.argv[2] == "commit")
                           or (sys.argv[2] == "merge")
                           or (sys.argv[2] == "squash") ) :
    exit()

message_filename = sys.argv[1]
is_command_line_message = ((len(sys.argv) > 2) and (sys.argv[2] == "message"))

branch = get_current_branch()

if not is_excluded_branch(branch):

    keys = config_keys()
    warnings = []
    values = {key : None for key in keys}
    
    for key in keys:

        if has_branch_config(branch, key):
            values[key] = get_branch_config(branch, key)
        else:
            warning = no_config_warning(branch, key)
            if is_command_line_message:
                print(warning, file=sys.stderr)
                print("\n")
            else:
                warnings.append(warning)

    original_message = ""
    with open(message_filename, "r") as f:
        original_message = f.read()

    message = build_commit_message( original_message,
                                    values["commitprefix"],
                                    values["issue"],
                                    warnings)

    with open(message_filename, "w") as f:
        f.write(message)