84 lines
2.0 KiB
Python
84 lines
2.0 KiB
Python
#!/usr/bin/env python
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import sys
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import json
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import urllib.request, urllib.error, urllib.parse
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from threading import Thread
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class BaseModule:
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output = None
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def registered(self, status_handler):
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"""Called when this module is registered with a status handler"""
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def tick(self):
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"""Called once per tick"""
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class Module(BaseModule):
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pass
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class AsyncModule(BaseModule):
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def registered(self, status_handler):
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self.thread = Thread(target=self.mainloop)
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self.thread.daemon = True
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self.thread.start()
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def mainloop(self):
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"""This is run in a separate daemon-thread"""
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class I3statusHandler:
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modules = []
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def __init__(self):
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pass
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def register(self, module):
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"""Register a new module."""
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self.modules.append(module)
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module.registered(self)
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def print_line(self, message):
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"""Unbuffered printing to stdout."""
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sys.stdout.write(message + "\n")
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sys.stdout.flush()
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def read_line(self):
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"""Interrupted respecting reader for stdin."""
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# try reading a line, removing any extra whitespace
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try:
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line = sys.stdin.readline().strip()
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# i3status sends EOF, or an empty line
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if not line:
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sys.exit(3)
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return line
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# exit on ctrl-c
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except KeyboardInterrupt:
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sys.exit()
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def run(self):
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self.print_line(self.read_line())
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self.print_line(self.read_line())
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while True:
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line, prefix = self.read_line(), ""
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# ignore comma at start of lines
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if line.startswith(","):
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line, prefix = line[1:], ","
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j = json.loads(line)
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for module in self.modules:
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module.tick()
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output = module.output
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if output:
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j.insert(0, output)
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# and echo back new encoded json
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self.print_line(prefix+json.dumps(j))
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