version

#!/usr/bin/env python3
# Usage:
#   ./bin/version
#       Prints the current version
#   ./bin/version minor
#       Tags a minor version bump
#   ./bin/version major
#       Tags a major version bump
#   ./bin/version changelog [-d distribution]
#       Prints a Debian changelog

import subprocess
import sys
import os
import re

def get_version(ref="HEAD"):
    describe = call('git describe {}'.format(ref))
    branch = call('git rev-parse --abbrev-ref HEAD')

    describe = describe.replace("-", ".").split(".")
    parts = [0, 0, 0, branch]

    l = len(describe)
    for i in range(3):
        if l > i:
            parts[i] = int(describe[i])

    return tuple(parts)


template = """{} ({}-1) {}; urgency=low

  * {}

 -- {} <{}>  {}
"""


def call(cmd):
    _, output = subprocess.getstatusoutput(cmd)
    return output


def gen_deb_changelog(distribution="", branchname=None):
    project = "apinext"

    git_cmd="git log -5 --pretty=format:%{}"

    commits = call(git_cmd.format("H")).split("\n")
    authors = call(git_cmd.format("aN")).split("\n")
    author_emails = call(git_cmd.format("aE")).split("\n")
    subjects = call(git_cmd.format("s")).split("\n")
    dates = call(git_cmd.format("aD")).split("\n")
    for commit, author, email, subject, date in zip(commits, authors, author_emails, subjects, dates):
        major, minor, patch, branch = get_version(commit)
        if not (major or minor or patch):
            version = "{}.{}.{}+git{}".format(major, minor, patch, commit)
        else:
            version = "{}.{}.{}{}".format(major, minor, patch,
                    '' if branchname == 'master'
                        else "~dev" if branchname == 'development'
                        else "~testing" if re.findall('^release\/\d+\.\d+$', branchname)
                        else '~PR' if branchname
                        else '')
        if not len(distribution):
            distribution = "stable" if major >= 1 else "unstable"
        print(template.format(project, version, distribution, subject, author, email, date))


major, minor, patch, branch = get_version()

if len(sys.argv) == 1:
    print("{}.{}.{}".format(major, minor, patch))
else:
    if sys.argv[1] == "branch":
        if len(sys.argv) == 2 or sys.argv[2] == "master":
            print("{}.{}.{}".format(major, minor, patch))
        elif sys.argv[2] == "development":
            print("{}.{}.{}~dev".format(major, minor, patch))
        elif re.findall('^release\/\d+\.\d+$', sys.argv[2]):
            print("{}.{}.{}~testing".format(major, minor, patch))
    elif sys.argv[1] == "minor":
        ver = "{}.{}".format(major, minor + 1)
        call("git tag -a {} -m {}".format(ver, ver))
        print("Created tag {}".format(ver))
    elif sys.argv[1] == "major":
        ver = "{}.{}".format(major + 1, 0)
        call("git tag -a {} -m {}".format(ver, ver))
        print("Created tag {}".format(ver))
    elif sys.argv[1] == "changelog":
        if len(sys.argv)>3 and sys.argv[2] == "-d":
            distribution=sys.argv[3]
        else:
            distribution=""
        gen_deb_changelog(distribution, sys.argv[4] if len(sys.argv) > 4 else None)