82 lines
2.2 KiB
Python
82 lines
2.2 KiB
Python
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#!/usr/bin/env python3
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import json
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class Metafile():
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"""Representation of a metafile (default name META), containing (as its
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name implies) metadata."""
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def __init__(self, json_path=None, name=None):
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self.name = name
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# json_path given => we load it ; otherwise fill with default
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if json_path is not None:
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self.load_json(json_path) # raise FileNotFoundError
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else:
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self.load_default()
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def load_default(self):
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self.json_path = None
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self.depends = {}
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self.files = {}
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# (Note that name is already written in __init__)
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def load_json(self, json_path):
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self.json_path = json_path
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tmp = json.load( open(self.json_path) ) # Can raise a FileNotFoundError
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try:
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self.name = tmp["name"]
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self.depends = tmp["depends"]
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self.files = tmp["files"]
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except KeyError:
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raise MalformedMetafileError("Missing attribute (name, depends or files)")
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def save(self):
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if self.json_path is None:
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raise NoPathDefinedError("json_path is not defined")
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json.dump( { "name": self.name, "depends": self.depends, "files": self.files }, open(self.json_path, 'w') )
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def get_files_dst2src(self):
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dstdic = {}
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try:
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for (fname, finfo) in self.files.items():
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dstdic[ finfo["dest"] ] = fname
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except KeyError:
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raise MalformedMetafileError("Missing 'dest' attribute in files infos")
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return dstdic
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def add_file(self, name, dest):
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self.files[name] = { "dest": dest }
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def del_file(self, name):
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del self.files[name]
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# Exceptions
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########################################
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class MalformedMetafileError(Exception):
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"""A custom exception to alert that the metafile is malformed"""
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def __init__(self, message):
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Exception.__init__(self, message)
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class NoPathDefinedError(Exception):
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"""A custom exception to alert that the json_path properties of the
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Metafile is not defined, therefore we cannot write the data."""
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def __init__(self, message):
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Exception.__init__(self, message)
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