add dev commands

MANIFEST.in

@@ -1,5 +1,5 @@
+include frontend/base.haml
+include frontend/style.css
 include data/statements.sql
 include data/swagger.yaml
 include frontend/page/home.haml
-include frontend/base.haml
-include frontend/style.css

dev-requirements.txt

@@ -1,3 +1,4 @@
 flake8 == 7.0.0
 pyinstaller == 6.3.0
 pylint == 3.0
+watchdog == 4.0.0

relay/dev.py

@@ -0,0 +1,153 @@
+import click
+import subprocess
+import sys
+import time
+
+from datetime import datetime
+from pathlib import Path
+
+try:
+	from watchdog.observers import Observer
+	from watchdog.events import PatternMatchingEventHandler
+
+except ImportError:
+	class PatternMatchingEventHandler:
+		pass
+
+
+SCRIPT = Path(__file__).parent
+REPO = SCRIPT.parent
+IGNORE_EXT = {
+	'.py',
+	'.pyc'
+}
+
+
+@click.group('cli')
+def cli():
+	'Useful commands for development'
+
+
+@cli.command('install')
+def cli_install():
+	cmd = [
+		sys.executable, '-m', 'pip', 'install',
+		'-r', 'requirements.txt',
+		'-r', 'dev-requirements.txt'
+	]
+
+	subprocess.run(cmd, check = False)
+
+
+@cli.command('lint')
+@click.argument('path', required = False, default = 'relay')
+def cli_lint(path):
+	subprocess.run([sys.executable, '-m', 'flake8', path], check = False)
+	subprocess.run([sys.executable, '-m', 'pylint', path], check = False)
+
+
+@cli.command('manifest-gen')
+def cli_manifest_install():
+	paths = []
+
+	for path in SCRIPT.rglob('*'):
+		if path.suffix.lower() in IGNORE_EXT or not path.is_file():
+			continue
+
+		paths.append(path)
+
+	with REPO.joinpath('MANIFEST.in').open('w', encoding = 'utf-8') as fd:
+		for path in paths:
+			fd.write(f'include {str(path.relative_to(SCRIPT))}\n')
+
+
+@cli.command('build')
+def cli_build():
+	cmd = [sys.executable, '-m', 'PyInstaller', 'relay.spec']
+	subprocess.run(cmd, check = False)
+
+
+@cli.command('run')
+def cli_run():
+	print('Starting process watcher')
+
+	handler = WatchHandler()
+	handler.run_proc()
+
+	watcher = Observer()
+	watcher.schedule(handler, str(SCRIPT), recursive=True)
+	watcher.start()
+
+	try:
+		while True:
+			handler.proc.stdin.write(sys.stdin.read().encode('UTF-8'))
+			handler.proc.stdin.flush()
+
+	except KeyboardInterrupt:
+		pass
+
+	handler.kill_proc()
+	watcher.stop()
+	watcher.join()
+
+
+
+class WatchHandler(PatternMatchingEventHandler):
+	patterns = ['*.py']
+	cmd = [sys.executable, '-m', 'relay', 'run']
+
+
+	def __init__(self):
+		PatternMatchingEventHandler.__init__(self)
+
+		self.proc = None
+		self.last_restart = None
+
+
+	def kill_proc(self):
+		if self.proc.poll() is not None:
+			return
+
+		print(f'Terminating process {self.proc.pid}')
+		self.proc.terminate()
+		sec = 0.0
+
+		while self.proc.poll() is None:
+			time.sleep(0.1)
+			sec += 0.1
+
+			if sec >= 5:
+				print('Failed to terminate. Killing process...')
+				self.proc.kill()
+				break
+
+		print('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:
+				return
+
+			self.kill_proc()
+
+		# pylint: disable=consider-using-with
+		self.proc = subprocess.Popen(self.cmd, stdin = subprocess.PIPE)
+		self.last_restart = timestamp
+
+		print(f'Started process with PID {self.proc.pid}')
+
+
+	def on_any_event(self, event):
+		if event.event_type not in ['modified', 'created', 'deleted']:
+			return
+
+		print(event.src_path)
+		self.run_proc(restart = True)
+
+
+if __name__ == '__main__':
+	cli()