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__init__.py
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__init__.py
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bl_info = {
"name": "Auto-Reload Linked Libraries",
"author": "gandalf3",
"version": (1, 0, 1),
"blender": (2, 80, 0),
"description": "Automatically reload linked libraries when they are modified.",
"doc_url": "https://github.com/gandalf3/auto-reload-linked-libraries",
"tracker_url": "https://github.com/gandalf3/auto-reload-linked-libraries/issues",
"category": "System",
}
import logging
logging.basicConfig(level=logging.WARNING)
logger = logging.getLogger('auto_reload_libraries')
logger.level = logging.INFO
import time
import os
import sys
# XXX add our "statically included" libraries to system include path
sys.path.insert(1, os.path.join(os.path.dirname(__file__), "extern"))
from watchdog.events import FileSystemEventHandler, EVENT_TYPE_OPENED
from watchdog.observers import Observer
import bpy
from bpy.app.handlers import persistent
OBSERVERS = []
SHOULD_RELOAD = False
@persistent
def load_handler(context: bpy.context):
logger.debug("load_handler running")
setup_observers()
@persistent
def depsgraph_update_post_handler(scene: bpy.types.Scene, context: bpy.context):
if len(bpy.data.libraries) != len(OBSERVERS):
logger.debug("Change in linked libraries detected")
setup_observers()
def setup_observers():
logger.debug("clearing OBSERVERS: %s", OBSERVERS)
for O in OBSERVERS:
O.stop()
OBSERVERS.clear()
logger.debug("cleared OBSERVERS: %s", OBSERVERS)
for lib in bpy.data.libraries:
logger.debug("installing observer for %s", lib.name)
observer = LibraryObserver(lib)
logger.debug(observer)
observer.start()
OBSERVERS.append(observer)
# Only run timer if there are actually linked libraries
if (len(OBSERVERS) > 0):
if (not bpy.app.timers.is_registered(check_if_need_to_reload)):
bpy.app.timers.register(check_if_need_to_reload, persistent=True)
else:
if (bpy.app.timers.is_registered(check_if_need_to_reload)):
bpy.app.timers.unregister(check_if_need_to_reload)
class AllEventTrigger(FileSystemEventHandler):
timeout = .3
last_occurance = 0
def __init__(self, func):
self.func = func
def on_any_event(self, event):
logger.debug(event)
if event.event_type == EVENT_TYPE_OPENED:
logger.debug("ignoring open event")
return
now = time.time()
if (now - self.last_occurance <= self.timeout):
return
time.sleep(self.timeout)
self.func()
self.last_occurance = time.time()
class DirectoryObserver(Observer):
watched_directories = {}
def __init__(self, directory, callback):
super().__init__()
self.directory = directory
self.callback = callback
if directory not in self.watched_directories:
self.watched_directories[self.directory] = [callback]
self.schedule(
AllEventTrigger(self.call_callbacks), self.directory, recursive=False
)
logger.debug("Watching directory %s", directory)
else:
self.watched_directories[self.directory].append(callback)
logger.debug("Already watching %s", self.directory)
def call_callbacks(self):
for cb in self.watched_directories[self.directory]:
cb()
def stop(self):
if self.directory not in self.watched_directories:
return
self.watched_directories[self.directory].remove(self.callback)
if len(self.watched_directories[self.directory]) <= 0:
del self.watched_directories[self.directory]
logger.debug("Stopping watching of %s", self.directory)
super().stop()
super().join(timeout=3)
if super().is_alive():
logger.warning("Timeout while stopping watching of '%s'", self.directory)
class LibraryObserver():
def __init__(self, library):
self.is_relative = False
self.triggered = False
libpath = library.filepath
if library.filepath.startswith('//'):
libpath = os.path.join(\
os.path.dirname(bpy.data.filepath),
library.filepath[2:]
)
logger.debug("dereferencing relative path: %s -> %s", library.filepath, libpath)
self.is_relative = True
self.libname = library.name
self.directory = os.path.dirname(libpath)
self.filename = os.path.basename(libpath)
self.mtime = os.path.getmtime(libpath)
self.libpath = libpath
self.directory_observer = DirectoryObserver(self.directory, self.trigger)
def trigger(self):
new_mtime = os.path.getmtime(self.libpath)
if new_mtime > self.mtime:
logger.debug("%s modified! %s > %s", self.filename, self.mtime, new_mtime)
global SHOULD_RELOAD
SHOULD_RELOAD = True
self.triggered = True
self.mtime = new_mtime
def reset(self):
self.triggered = False
def start(self):
self.directory_observer.start()
def stop(self):
self.directory_observer.stop()
def __repr__(self):
return f"LibraryObserver(<{self.libname}>)"
def check_if_need_to_reload():
try:
if SHOULD_RELOAD:
do_lib_reload()
except KeyboardInterrupt:
pass
return .3
def do_lib_reload():
for O in OBSERVERS:
if O.triggered:
libname = O.libname
libdir = O.directory
libfile = O.filename
logger.info("Reloading %s", libname)
logger.debug("bpy.ops.wm.lib_reload(library=\"%s\", directory=\"%s\", filename=\"%s\")", libname, libdir, libfile)
logger.debug(bpy.ops.wm.lib_reload(library=libname, directory=libdir, filename=libfile))
O.reset()
global SHOULD_RELOAD
SHOULD_RELOAD = False
def one_time_setup():
setup_observers()
bpy.app.timers.unregister(one_time_setup)
return 10
def one_time_unsetup():
logger.debug("clearing OBSERVERS: %s", OBSERVERS)
for O in OBSERVERS:
O.stop()
OBSERVERS.clear()
bpy.app.timers.unregister(one_time_unsetup)
def register():
bpy.app.handlers.load_post.append(load_handler)
bpy.app.handlers.depsgraph_update_post.append(depsgraph_update_post_handler)
bpy.app.timers.register(one_time_setup, persistent=False)
# timer registered on-demand, see setup_observers()
# bpy.app.timers.register(check_if_need_to_reload, persistent=True)
logger.info("Registered Auto-Reload Libraries")
def unregister():
bpy.app.handlers.load_post.remove(load_handler)
bpy.app.handlers.depsgraph_update_post.remove(depsgraph_update_post_handler)
bpy.app.timers.register(one_time_unsetup, persistent=False)
if bpy.app.timers.is_registered(check_if_need_to_reload):
bpy.app.timers.unregister(check_if_need_to_reload)
if __name__ == "__main__":
register()