add --watch option to lint dev command

relay/dev.py

@@ -4,9 +4,10 @@ import subprocess
 import sys
 import time
 
-from datetime import datetime
+from datetime import datetime, timedelta
 from pathlib import Path
 from tempfile import TemporaryDirectory
+from typing import Sequence
 
 from . import __version__
 from . import logger as logging
@@ -47,14 +48,24 @@ def cli_install():
 @cli.command('lint')
 @click.argument('path', required = False, default = 'relay')
 @click.option('--strict', '-s', is_flag = True, help = 'Enable strict mode for mypy')
-def cli_lint(path: str, strict: bool) -> None:
-	cmd: list[str] = [sys.executable, '-m', 'mypy']
+@click.option('--watch', '-w', is_flag = True,
+	help = 'Automatically, re-run the linters on source change')
+def cli_lint(path: str, strict: bool, watch: bool) -> None:
+	flake8 = [sys.executable, '-m', 'flake8', path]
+	mypy = [sys.executable, '-m', 'mypy', path]
 
 	if strict:
-		cmd.append('--strict')
+		mypy.append('--strict')
 
-	subprocess.run([*cmd, path], check = False)
-	subprocess.run([sys.executable, '-m', 'flake8', path])
+	if watch:
+		handle_run_watcher(mypy, flake8, wait = True)
+		return
+
+	click.echo('----- flake8 -----')
+	subprocess.run(flake8)
+
+	click.echo('\n\n----- mypy -----')
+	subprocess.run(mypy)
 
 
 @cli.command('build')
@@ -91,8 +102,17 @@ def cli_build():
 def cli_run(dev: bool):
 	print('Starting process watcher')
 
-	handler = WatchHandler(dev)
-	handler.run_proc()
+	cmd = [sys.executable, '-m', 'relay', 'run']
+
+	if dev:
+		cmd.append('-d')
+
+	handle_run_watcher(cmd)
+
+
+def handle_run_watcher(*commands: Sequence[str], wait: bool = False):
+	handler = WatchHandler(*commands, wait = wait)
+	handler.run_procs()
 
 	watcher = Observer()
 	watcher.schedule(handler, str(SCRIPT), recursive=True)
@@ -100,13 +120,12 @@ def cli_run(dev: bool):
 
 	try:
 		while True:
-			handler.proc.stdin.write(sys.stdin.read().encode('UTF-8')) # type: ignore
-			handler.proc.stdin.flush() # type: ignore
+			time.sleep(1)
 
 	except KeyboardInterrupt:
 		pass
 
-	handler.kill_proc()
+	handler.kill_procs()
 	watcher.stop()
 	watcher.join()
 
@@ -114,61 +133,65 @@ def cli_run(dev: bool):
 
 class WatchHandler(PatternMatchingEventHandler):
 	patterns = ['*.py']
-	cmd = [sys.executable, '-m', 'relay', 'run']
 
 
-	def __init__(self, dev: bool):
+	def __init__(self, *commands: Sequence[str], wait: bool = False):
 		PatternMatchingEventHandler.__init__(self)
 
-		self.dev: bool = dev
-		self.proc: subprocess.Popen | None = None
-		self.last_restart: datetime | None = None
+		self.commands: Sequence[Sequence[str]] = commands
+		self.wait: bool = wait
+		self.procs: list[subprocess.Popen] = []
+		self.last_restart: datetime = datetime.now()
 
 
-	def kill_proc(self):
-		if not self.proc or self.proc.poll() is not None:
-			return
+	def kill_procs(self):
+		for proc in self.procs:
+			if proc.poll() is not None:
+				continue
 
-		logging.info(f'Terminating process {self.proc.pid}')
-		self.proc.terminate()
+			logging.info(f'Terminating process {proc.pid}')
+			proc.terminate()
 			sec = 0.0
 
-		while self.proc.poll() is None:
+			while proc.poll() is None:
 				time.sleep(0.1)
 				sec += 0.1
 
 				if sec >= 5:
 					logging.error('Failed to terminate. Killing process...')
-				self.proc.kill()
+					proc.kill()
 					break
 
 			logging.info('Process terminated')
 
 
-	def run_proc(self, restart=False):
-		timestamp = datetime.timestamp(datetime.now())
-		self.last_restart = timestamp if not self.last_restart else 0
-
-		if restart and self.proc.pid != '':
-			if timestamp - 3 < self.last_restart:
+	def run_procs(self, restart: bool = False):
+		if restart:
+			if datetime.now() - timedelta(seconds = 3) < self.last_restart:
 				return
 
-			self.kill_proc()
+			self.kill_procs()
 
-		cmd = [*self.cmd, '-d'] if self.dev else self.cmd
+		self.last_restart = datetime.now()
 
-		self.proc = subprocess.Popen(cmd, stdin = subprocess.PIPE)
-		self.last_restart = timestamp
+		if self.wait:
+			self.procs = []
 
-		logging.info('Started process with PID %i', self.proc.pid)
-		logging.info('Command: %s', ' '.join(cmd))
+			for cmd in self.commands:
+				logging.info('Running command: %s', ' '.join(cmd))
+				subprocess.run(cmd)
+
+		else:
+			self.procs = list(subprocess.Popen(cmd) for cmd in self.commands)
+			pids = (str(proc.pid) for proc in self.procs)
+			logging.info('Started processes with PIDs: %s', ', '.join(pids))
 
 
 	def on_any_event(self, event):
 		if event.event_type not in ['modified', 'created', 'deleted']:
 			return
 
-		self.run_proc(restart = True)
+		self.run_procs(restart = True)
 
 
 if __name__ == '__main__':