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vire.py
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vire.py
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from __future__ import annotations
from typing import *
from dataclasses import dataclass
from pathlib import Path
from queue import Queue
import argparse
import importlib
import os
import runpy
import signal
import sys
import termios
import threading
import tty
import traceback
import time
from inotify_simple import INotify, flags # type: ignore
STDIN_FILENO = sys.stdin.fileno()
STDOUT_FILENO = sys.stdout.fileno()
def spawn(f: Callable[[], None]) -> None:
threading.Thread(target=f, daemon=True).start()
def sigterm(pid: int):
try:
os.kill(pid, signal.SIGTERM)
relevant = True
@spawn
def _():
time.sleep(1)
if relevant:
print('waited for 5s, now sending SIGKILL...')
os.kill(pid, signal.SIGKILL)
# print('wait')
os.waitpid(pid, 0)
relevant = False
except ProcessLookupError:
pass
def clear(clear_opt: int):
# from entr: https://github.com/eradman/entr/blob/master/entr.c
# 2J - erase the entire display
# 3J - clear scrollback buffer
# H - set cursor position to the default
if clear_opt == 1:
print('\033[2J\033[H', end='', flush=True)
if clear_opt >= 2:
print('\033[2J\033[3J\033[H', end='', flush=True)
def run_child(argv: list[str], is_module: bool):
sys.dont_write_bytecode = True
sys.argv[1:] = argv[1:]
try:
if is_module:
runpy.run_module(argv[0], run_name='__main__')
else:
sys.path = [str(Path(argv[0]).parent), *sys.path]
runpy.run_path(argv[0], run_name='__main__')
except SystemExit:
pass
except:
traceback.print_exc()
@dataclass
class Vire:
preload: str
argv: list[str]
is_module: bool
glob_patterns: str
clear_opt: int = 0
silent: bool = False
auto_full_reload: bool = False
preload_exclude: Iterable[str] = ()
_restore: Callable[[], None] = lambda: None
def main(self):
if not sys.stdin.isatty():
self._main()
else:
mode = termios.tcgetattr(STDIN_FILENO)
self._restore = lambda: termios.tcsetattr(STDIN_FILENO, termios.TCSAFLUSH, mode)
try:
tty.setcbreak(STDIN_FILENO) # required for returning single characters from standard input
self._main()
finally:
self._restore()
def getchar(self):
# requires tty.setcbreak
return sys.stdin.read(1)
def _main(self):
sys_argv_copy = [*sys.argv]
# print(f'{sys.executable=} {sys_argv_copy=}')
for name in self.preload.split(','):
name = name.strip()
if name:
try:
importlib.import_module(name)
except:
traceback.print_exc()
imported_at_preload: set[str] = {
file
for _, m in sys.modules.items()
for file in [getattr(m, '__file__', None)]
if file
if not file.startswith('/usr')
}
imported_at_preload = imported_at_preload - {*self.preload_exclude}
wd_to_filename: dict[int, str] = {}
ino: Any = INotify()
def add_watch(filename: str | Path):
wd = ino.add_watch(filename, flags.MODIFY)
wd_to_filename[wd] = str(Path(filename).resolve())
for name in imported_at_preload:
add_watch(name)
for glob_pattern in self.glob_patterns.split(','):
for name in Path('.').glob(glob_pattern.strip()):
add_watch(name)
out_of_sync: set[str] = set()
q: Queue[Union[set[str], str]] = Queue()
@spawn
def bg_getchar():
while True:
c = self.getchar()
q.put_nowait(c)
@spawn
def bg_read_events():
nonlocal out_of_sync
while True:
events = ino.read(read_delay=1)
files = {wd_to_filename[e.wd] for e in events}
out_of_sync |= files & imported_at_preload
msg = files - imported_at_preload
q.put(msg)
while True:
clear(self.clear_opt)
pid = fork(lambda: run_child(self.argv, is_module=self.is_module))
out_of_sync_reported: set[str] = set()
while True:
if not self.silent and out_of_sync != out_of_sync_reported:
print('vire: Preloaded files have been modified:', file=sys.stderr)
print(*[' ' + f for f in out_of_sync], sep='\n', file=sys.stderr)
print(' Press R for full reload.', file=sys.stderr)
out_of_sync_reported = set(out_of_sync)
try:
msg = q.get()
except KeyboardInterrupt:
msg = 'q'
if self.auto_full_reload and out_of_sync:
print('vire: Preloaded files have been modified:', file=sys.stderr)
print(*[' ' + f for f in out_of_sync], sep='\n', file=sys.stderr)
print(' Running full reload.', file=sys.stderr)
msg = 'R-auto'
if msg == 'q':
sigterm(pid)
sys.exit()
if msg == 'R' or msg == 'R-auto':
sigterm(pid)
clear(1 if msg == 'R' else self.clear_opt)
self._restore()
max_fd = os.sysconf("SC_OPEN_MAX")
os.closerange(3, max_fd)
sys.argv[:] = sys_argv_copy
if os.access(sys.argv[0], os.X_OK):
os.execve(sys.argv[0], sys.argv, os.environ)
else:
sys.argv[:] = [sys.executable, *sys_argv_copy]
os.execve(sys.argv[0], sys.argv, os.environ)
if msg == 'c':
clear(1)
break
if msg == 'C':
clear(2)
break
if msg == ' ' or msg == 'r':
break
if isinstance(msg, set) and msg:
break
sigterm(pid)
def fork(child: Callable[[], None]):
pid = os.fork()
if pid == 0:
os.dup2(os.open('/dev/null', os.O_RDONLY), STDIN_FILENO)
child()
return pid
_is_reloading: bool = False
_is_running_from_command_line_tool: bool = False
def reload(filepath: str, *, glob: str='**/*.py', auto_full_reload: bool=False, clear: int=1):
global _is_reloading
if _is_running_from_command_line_tool:
raise ValueError('Not a good idea to run both vire.reload and the vire command line tool')
# print(f'{_is_reloading=}\n{sys.argv=}')
if _is_reloading:
return
else:
_is_reloading = True
Vire(
preload = '',
argv = [*sys.argv],
is_module = False,
glob_patterns = glob,
clear_opt = clear,
silent = False,
auto_full_reload = auto_full_reload,
preload_exclude = (filepath,)
).main()
def main():
global _is_running_from_command_line_tool
_is_running_from_command_line_tool = True
parser = argparse.ArgumentParser(
description='''
Runs a program and reruns it on updating files matching a glob (default **/*.py).
''',
add_help=False,
)
parser.add_argument('--help', '-h', action='store_true', help=argparse.SUPPRESS)
parser.add_argument('--clear', '-c', action='count', default=0, help='Clear the screen before invoking the utility. Specify twice to erase the scrollback buffer.')
parser.add_argument('--preload', '-p', metavar='M', help='Modules to preload, comma-separated. Example: flask,pandas')
parser.add_argument('--glob', '-g', metavar='G', help='Watch for updates to files matching this glob, Default: **/*.py', default='**/*.py')
parser.add_argument('--silent', '-s', action='store_true', help='Silence warning about modifications to preloaded modules.')
parser.add_argument('--auto-full-reload', '-r', action='store_true', help='Automatically do full reload on modifications to preloaded modules.')
parser.add_argument('-m', action='store_true', help='Argument is a module, will be run like python -m (using runpy)')
parser.add_argument(dest='argv', nargs=argparse.REMAINDER)
args = parser.parse_args()
if not args.argv or args.help:
parser.print_help()
quit()
Vire(
preload = args.preload or '',
argv = args.argv,
is_module = args.m,
glob_patterns = args.glob,
clear_opt = args.clear,
silent = args.silent,
auto_full_reload = args.auto_full_reload,
).main()
if __name__ == '__main__':
main()