52 lines
1.6 KiB
Python
52 lines
1.6 KiB
Python
import os
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import json
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CACHE_VERSION = 2
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def remove_name(options):
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noname_options = options.copy()
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del noname_options["name"]
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return noname_options
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class Cache(object):
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cache_file_path = os.path.join(os.getcwd(), ".prosopopee_cache")
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def __init__(self, json):
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# fix: I need to keep a reference to json because for whatever reason
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# modules are set to None during python shutdown thus totally breaking
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# the __del__ call to save the cache
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# This wonderfully stupid behavior has been fixed in 3.4 (which nobody uses)
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self.json = json
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if os.path.exists(os.path.join(os.getcwd(), ".prosopopee_cache")):
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self.cache = json.load(open(self.cache_file_path, "r"))
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else:
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self.cache = {"version": CACHE_VERSION}
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if "version" not in self.cache or self.cache["version"] != CACHE_VERSION:
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print "info: cache format as changed, prune cache"
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self.cache = {"version": CACHE_VERSION}
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def needs_to_be_generated(self, source, target, options):
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if not os.path.exists(target):
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return True
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if target not in self.cache:
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return True
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cached_picture = self.cache[target]
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if cached_picture["size"] != os.path.getsize(source) or cached_picture["options"] != remove_name(options):
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return True
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return False
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def cache_picture(self, source, target, options):
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self.cache[target] = {"size": os.path.getsize(source), "options": remove_name(options)}
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def __del__(self):
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self.json.dump(self.cache, open(self.cache_file_path, "w"))
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CACHE = Cache(json=json)
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