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mplewis/watchdiff.py

Last active April 30, 2022 22:32
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Watch a single file and output a diff when it changes.
Raw
watchdiff.py
#!/usr/bin/env python3
from diff_match_patch import diff_match_patch
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler
import sys
import time
from os.path import abspath, dirname
class DiffHandler(FileSystemEventHandler):
def __init__(self, to_watch):
self.differ = diff_match_patch()
self.to_watch = to_watch
with open(self.to_watch) as f:
self.last_contents = f.read()
def on_modified(self, event):
if event.src_path == self.to_watch:
with open(self.to_watch) as f:
new_contents = f.read()
patch = self.differ.patch_make(self.last_contents, new_contents)
patch_text = self.differ.patch_toText(patch)
print(patch_text)
self.last_contents = new_contents
if len(sys.argv) > 1:
to_watch = abspath(sys.argv[1])
else:
print('Error: Select a file to watch.')
sys.exit(1)
observer = Observer()
observer.schedule(DiffHandler(to_watch), dirname(to_watch))
observer.start()
try:
while True:
time.sleep(1)
except KeyboardInterrupt:
observer.stop()
observer.join()
Raw
z_requirements.txt
diff-match-patch==20121119
watchdog==0.8.1
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