mirror of
https://github.com/clinton-hall/nzbToMedia.git
synced 2025-07-16 02:02:53 -07:00
6bb4ae56bd
Dependencies: * backports.functools-lru-cache 1.2.1 * jaraco.classes 1.3 * jaraco.collections 1.3.2 * jaraco.functools 1.11 * jaraco.structures 1.0 * jaraco.text 1.7 * jaraco.ui 1.4 * jaraco.windows 3.6 * more-itertools 2.2 * path.py 8.2.1 * six 1.10.0
108 lines
2.7 KiB
Python
108 lines
2.7 KiB
Python
from __future__ import unicode_literals, absolute_import
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import tempfile
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import os
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import sys
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import subprocess
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import mimetypes
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import collections
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import io
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import difflib
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import six
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class EditProcessException(RuntimeError): pass
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class EditableFile(object):
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"""
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EditableFile saves some data to a temporary file, launches a
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platform editor for interactive editing, and then reloads the data,
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setting .changed to True if the data was edited.
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e.g.::
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x = EditableFile('foo')
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x.edit()
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if x.changed:
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print(x.data)
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The EDITOR environment variable can define which executable to use
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(also XML_EDITOR if the content-type to edit includes 'xml'). If no
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EDITOR is defined, defaults to 'notepad' on Windows and 'edit' on
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other platforms.
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"""
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platform_default_editors = collections.defaultdict(
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lambda: 'edit',
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win32 = 'notepad',
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linux2 = 'vi',
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)
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encoding = 'utf-8'
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def __init__(self, data='', content_type='text/plain'):
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self.data = six.text_type(data)
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self.content_type = content_type
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def __enter__(self):
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extension = mimetypes.guess_extension(self.content_type) or ''
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fobj, self.name = tempfile.mkstemp(extension)
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os.write(fobj, self.data.encode(self.encoding))
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os.close(fobj)
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return self
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def read(self):
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with open(self.name, 'rb') as f:
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return f.read().decode(self.encoding)
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def __exit__(self, *tb_info):
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os.remove(self.name)
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def edit(self):
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"""
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Edit the file
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"""
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self.changed = False
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with self:
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editor = self.get_editor()
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cmd = [editor, self.name]
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try:
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res = subprocess.call(cmd)
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except Exception as e:
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print("Error launching editor %(editor)s" % locals())
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print(e)
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return
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if res != 0:
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msg = '%(editor)s returned error status %(res)d' % locals()
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raise EditProcessException(msg)
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new_data = self.read()
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if new_data != self.data:
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self.changed = self._save_diff(self.data, new_data)
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self.data = new_data
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@staticmethod
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def _search_env(keys):
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"""
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Search the environment for the supplied keys, returning the first
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one found or None if none was found.
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"""
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matches = (os.environ[key] for key in keys if key in os.environ)
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return next(matches, None)
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def get_editor(self):
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"""
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Give preference to an XML_EDITOR or EDITOR defined in the
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environment. Otherwise use a default editor based on platform.
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"""
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env_search = ['EDITOR']
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if 'xml' in self.content_type:
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env_search.insert(0, 'XML_EDITOR')
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default_editor = self.platform_default_editors[sys.platform]
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return self._search_env(env_search) or default_editor
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@staticmethod
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def _save_diff(*versions):
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def get_lines(content):
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return list(io.StringIO(content))
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lines = map(get_lines, versions)
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diff = difflib.context_diff(*lines)
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return tuple(diff)
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