00hello.py

from handofcats import as_command, print


@as_command
def run():
    print("hello")
    print("byebye")

0102.diff

--- 01update_check.py	2020-03-01 15:37:07.000000000 +0900
+++ 02update_check.py	2020-03-01 15:37:22.000000000 +0900
@@ -31,7 +31,8 @@
 def main():
     async def run():
         fut = asyncio.ensure_future(update_check())
-        run_main()
+        loop = asyncio.get_event_loop()
+        await loop.run_in_executor(None, run_main)
         update_version = await fut
         if update_version is not None:
             print(f"A new release of gh is available: xxx → {update_version}")

01update_check.py

import typing as t
import asyncio
import random
from handofcats import as_command, print


async def update_check() -> t.Awaitable[t.Optional[str]]:
    print("-> update_check ...")
    await asyncio.sleep(0.5)
    print("<- ... update_check")

    if random.random() < 0.2:
        # update is not found
        return None

    # update is found
    return "0.8.8"


def run_main():
    import time

    print("do something (main)")
    for i in range(6):
        print(".")
        time.sleep(0.1)
    print("ok")


@as_command
def main():
    async def run():
        fut = asyncio.ensure_future(update_check())
        run_main()
        update_version = await fut
        if update_version is not None:
            print(f"A new release of gh is available: xxx → {update_version}")

    asyncio.run(run())

02update_check.py

import typing as t
import asyncio
import random
from handofcats import as_command, print


async def update_check() -> t.Awaitable[t.Optional[str]]:
    print("-> update_check ...")
    await asyncio.sleep(0.5)
    print("<- ... update_check")

    if random.random() < 0.2:
        # update is not found
        return None

    # update is found
    return "0.8.8"


def run_main():
    import time

    print("do something (main)")
    for i in range(6):
        print(".")
        time.sleep(0.1)
    print("ok")


@as_command
def main():
    async def run():
        fut = asyncio.ensure_future(update_check())
        loop = asyncio.get_event_loop()
        await loop.run_in_executor(None, run_main)
        update_version = await fut
        if update_version is not None:
            print(f"A new release of gh is available: xxx → {update_version}")

    asyncio.run(run())

Makefile

00:
	DEBUG=1 python $(shell echo $@*.py)
01:
	LOGGING_TIME=relative DEBUG=1 python $(shell echo $@*.py)
02:
	LOGGING_TIME=relative DEBUG=1 python $(shell echo $@*.py)
03:
	diff -u 01*.py 02*.py > 0102.diff