add automated calendar version manager

Signed-off-by: Harsha Narayana <harsha2k4@gmail.com>

release.py

@@ -0,0 +1,136 @@
+#!/usr/bin/env python
+
+from argparse import ArgumentParser, Namespace
+from datetime import datetime
+from os import path
+from configparser import RawConfigParser
+from subprocess import Popen, PIPE
+
+
+GIT_COMMANDS = {
+    "get_tag": ["git describe --tags --abbrev=0"],
+    "create_new_branch": ["git checkout -b {new_version} master"],
+    "commit_version_change": ["git commit -m 'Bumping up version from {current_version} to {new_version}"],
+    "push_new_branch": ["git push origin {new_version}"],
+    "create_new_tag": ["git tag -a {new_version} -m 'Bumping up version from {current_version} to {new_version}"],
+    "push_tag": ["git push origin {new_version}"],
+    "get_change_log": ['git log --no-merges --pretty=format:"%h: %cn: %s" {current_version}..']
+}
+
+
+def _run_shell_command(command: list):
+    try:
+        process = Popen(command, stderr=PIPE, stdout=PIPE, stdin=PIPE,
+                        shell=True)
+        output, error = process.communicate()
+        return_code = process.returncode
+        return output, error, return_code
+    except:
+        return None, None, -1
+
+
+def _fetch_default_calendar_release_version():
+    return datetime.now().strftime("%y.%m.0")
+
+
+def _fetch_current_version(config_file: str) -> str:
+    if path.isfile(config_file):
+        config_parser = RawConfigParser()
+        with open(config_file) as cfg:
+            config_parser.read_file(cfg)
+            return config_parser.get("version", "current_version") or _fetch_default_calendar_release_version()
+    else:
+        return _fetch_default_calendar_release_version()
+
+
+def _change_micro_version(current_version: str):
+    version_string = current_version.split(".")
+    version_string[-1] = str((int(version_string[-1]) + 1))
+    return ".".join(version_string)
+
+
+def _get_new_version(config_file: str = "./setup.cfg", current_version: str = None,
+                     micro_release: bool = False):
+    if micro_release:
+        if current_version:
+            return _change_micro_version(current_version)
+        elif config_file:
+            return _change_micro_version(_fetch_current_version(config_file))
+        else:
+            return _fetch_default_calendar_release_version()
+    else:
+        return _fetch_default_calendar_release_version()
+
+
+def _get_current_tag(git_command_name="get_tag"):
+    global GIT_COMMANDS
+    command = GIT_COMMANDS.get(git_command_name)
+    out, err, ret = _run_shell_command(command)
+    if len(str(out)):
+        return str(out).split("\n")[0]
+    else:
+        return None
+
+
+def _update_release_version_for_sanic(current_version, new_version, config_file):
+    old_version_line = '__version__ = "{current_version}"'.format(current_version=current_version)
+    new_version_line = '__version__ = "{new_version}"'.format(new_version=new_version)
+
+    with open("sanic/__init__.py") as init_file:
+        data = init_file.read()
+
+    new_data = data.replace(old_version_line, new_version_line)
+    with open("sanic/__init__.py", "w") as init_file:
+        init_file.write(new_data)
+
+    config_parser = RawConfigParser()
+    with open(config_file) as cfg:
+        config_parser.read_file(cfg)
+    config_parser.set("version", "current_version", new_version)
+
+    with open(config_file, "w") as config:
+        config_parser.write(config)
+
+    command = GIT_COMMANDS.get("commit_version_change")
+    command[0] = command[0].format(new_version=new_version, current_version=current_version)
+    _, _, ret = _run_shell_command(command)
+    if int(ret) != 0:
+        print("Failed to Commit Version upgrade changes to Sanic")
+        exit(1)
+
+
+def _tag_release(new_version, current_version):
+    global GIT_COMMANDS
+    for command_name in ["push_new_branch", "create_new_tag", "push_tag"]:
+        command = GIT_COMMANDS.get(command_name)
+        command[0] = command[0].format(new_version=new_version, current_version=current_version)
+        out, error, ret = _run_shell_command(command=command)
+        if int(ret) != 0:
+            print("Failed to execute the command: {}".format(command[0]))
+            exit(1)
+
+
+def release(args: Namespace):
+    current_tag = _get_current_tag()
+    current_version = _fetch_current_version(args.config)
+    if current_tag and current_version not in current_tag:
+        print("Tag mismatch between what's in git and what was provided by --current-version")
+        exit(1)
+    new_version = _get_new_version(args.config, current_version, args.micro_release)
+    _update_release_version_for_sanic(current_version=current_version, new_version=new_version, config_file=args.config)
+    _tag_release(current_version=current_version, new_version=new_version)
+
+
+if __name__ == '__main__':
+    cli = ArgumentParser(description="Sanic Release Manager")
+    cli.add_argument("--release-version", "-r", help="New Version to use for Release",
+                     default=_fetch_default_calendar_release_version(),
+                     required=False)
+    cli.add_argument("--current-version", "-cv", help="Current Version to default in case if you don't want to "
+                                                      "use the version configuration files",
+                     default=None, required=False)
+    cli.add_argument("--config", "-c", help="Configuration file used for release", default="./setup.cfg", required=False)
+    cli.add_argument("--micro-release", "-m", help="Micro Release with patches only",
+                     default=False, action='store_true', required=False)
+    args = cli.parse_args()
+    release(args)

setup.cfg

@@ -1,11 +1,8 @@
 [flake8]
-# https://github.com/ambv/black#slices
-# https://github.com/ambv/black#line-breaks--binary-operators
 ignore = E203, W503
 
-
 [isort]
-atomic=true
+atomic = true
 default_section = THIRDPARTY
 include_trailing_comma = true
 known_first_party = sanic
@@ -15,3 +12,6 @@ lines_after_imports = 2
 lines_between_types = 1
 multi_line_output = 3
 not_skip = __init__.py
+
+[version]
+current_version = 0.8.3