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from click import echo
from hashlib import md5
from pathlib import Path
from .exceptions import \
IsSymlink, NotASymlink, TargetExists, TargetMissing, Exists
class Dotfile(object):
"""A configuration file managed within a repository.
:param name: name of the symlink in the home directory (~/.vimrc)
:param target: where the symlink should point to (~/Dotfiles/vimrc)
"""
def __init__(self, name, target):
self.name = Path(name)
self.target = Path(target)
def __str__(self):
return str(self.name)
def __repr__(self):
return '<Dotfile %r>' % self.name
def _ensure_dirs(self, debug):
"""Ensure the directories for both name and target are in place.
This is needed for the 'add' and 'link' operations where the
directory structure is expected to exist.
"""
def ensure(dir, debug):
if not dir.is_dir():
if debug:
echo('MKDIR %s' % dir)
else:
dir.mkdir(parents=True)
ensure(self.name.parent, debug)
ensure(self.target.parent, debug)
def _link(self, debug):
"""Create a symlink from name to target, no error checking."""
source = self.name
target = self.target
if self.name.is_symlink():
source = self.target
target = self.name.realpath()
if debug:
echo('LINK %s -> %s' % (source, target))
else:
source.symlink_to(target)
def _unlink(self, debug):
"""Remove a symlink in the home directory, no error checking."""
if debug:
echo('UNLINK %s' % self.name)
else:
self.name.unlink()
def short_name(self, homedir):
"""A shorter, more readable name given a home directory."""
return self.name.relative_to(homedir)
# return homedir.bestrelpath(self.name)
def is_present(self):
"""Is this dotfile present in the repository?"""
# return self.name.islink() and (self.name.realpath() == self.target)
return self.name.is_symlink() and (self.name.resolve() == self.target)
@property
def state(self):
"""The current state of this dotfile."""
if not self.target.exists():
# only for testing, cli should never reach this state
return 'error'
# elif self.name.check(exists=0):
elif not self.name.exists():
# no $HOME file or symlink
return 'missing'
# elif self.name.islink():
elif self.name.is_symlink():
# name exists, is a link, but isn't a link to the target
if not self.name.samefile(self.target):
return 'conflict'
else:
# name exists, is a file, but differs from the target
# if self.name.computehash() != self.target.computehash():
if md5(self.name.read_bytes()).hexdigest() != \
md5(self.target.read_bytes()).hexdigest():
return 'conflict'
return 'ok'
def add(self, debug=False):
"""Move a dotfile to it's target and create a symlink."""
if self.is_present():
raise IsSymlink(self.name)
# if self.target.check(exists=1):
if self.target.exists():
raise TargetExists(self.name)
self._ensure_dirs(debug)
if not self.name.is_symlink():
if debug:
echo('MOVE %s -> %s' % (self.name, self.target))
else:
# self.name.move(self.target)
self.name.replace(self.target)
self._link(debug)
def remove(self, debug=False):
"""Remove a symlink and move the target back to its name."""
# if self.name.check(link=0):
if not self.name.is_symlink():
raise NotASymlink(self.name)
# if self.target.check(exists=0):
if not self.target.is_file():
raise TargetMissing(self.name)
self._unlink(debug)
if debug:
echo('MOVE %s -> %s' % (self.target, self.name))
else:
self.target.replace(self.name)
def link(self, debug=False):
"""Create a symlink from name to target."""
# if self.name.check(exists=1):
if self.name.exists():
raise Exists(self.name)
# if self.target.check(exists=0):
if not self.target.exists():
raise TargetMissing(self.name)
self._ensure_dirs(debug)
self._link(debug)
def unlink(self, debug=False):
"""Remove a symlink from name to target."""
# if self.name.check(link=0):
if not self.name.is_symlink():
raise NotASymlink(self.name)
if not self.target.exists():
raise TargetMissing(self.name)
if not self.name.samefile(self.target):
raise RuntimeError
self._unlink(debug)
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