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from pathlib import Path
import json
from enum import Enum
import hashlib
import os
from .writer import Writer
def add_or_create(dictio, key, value):
if key in dictio:
if value not in dictio[key]:
dictio[key].append(value)
else:
dictio[key] = [value]
class FileState(Enum):
Unused = 1
Owned = 2
Used = 3
links_to_path: Path = Path()
def can_write(self) -> bool:
return self in [FileState.Unused, FileState.Owned]
def links_to(self) -> str:
if self is not FileState.Owned:
raise Exception(f"Cannot call location on {self}")
return self.links_to_path
def link_intact(self) -> bool:
return Path(self.links_to()).exists()
def check_string(self, dotdir: Path) -> str:
if self == FileState.Unused:
return "Free"
elif self == FileState.Owned:
status = "Intact" if self.link_intact() else "Broken"
return f"Owned by {self.owner(dotdir)} ({status})"
else:
return "Occupied"
def owner(self, dotdir: Path) -> str:
to = Path(self.links_to())
return to.relative_to(dotdir).parts[0]
@staticmethod
def create_owned(links_to: Path) -> "FileState":
s = FileState.Owned
s.links_to_path = links_to
return s
@staticmethod
def check_location(path: Path) -> "FileState":
if path.is_symlink():
dest = Path(os.readlink(str(path)))
if Path.cwd() in dest.parents:
return FileState.create_owned(dest)
else:
return FileState.Used
if not path.exists():
return FileState.Unused
return FileState.Used
class StateFile:
links = {}
dirs = {}
saved = []
attr_to_save = ["links", "applydir", "dirs", "saved"]
def __init__(self, applydir):
# Generate unique string for each possible applydir
ustr = hashlib.md5(applydir.encode("utf-8")).hexdigest()[10:]
self.applydir = str(applydir)
self.statefile = Path(f"state_{ustr}.json")
if self.statefile.exists():
with self.statefile.open("r") as f:
self.set_from_dict(json.load(f))
else:
self.set_from_dict({})
self.stateclean = True
def set_from_dict(self, state):
self.links = state.get("links", {})
self.dirs = state.get("dirs", {})
self.applydir = state.get("applydir", self.applydir)
self.saved = state.get("saved", [])
def save_to_dict(self):
all_attr = self.__dict__
res = {}
for key in self.attr_to_save:
res[key] = all_attr[key]
return res
def dump_state(self, dry_run):
if dry_run:
return
with self.statefile.open("w") as f:
json.dump(self.save_to_dict(), f)
def add_dir(self, path: Path, modulename: str):
# Add to state
add_or_create(self.dirs, str(path), modulename)
def add_link(self, dest, modulename):
self.links[str(dest)] = modulename
def add_saved_module(self, modulename):
if modulename not in self.saved:
self.saved.append(modulename)
def is_saved(self, modulename):
return modulename in self.saved
def remove_saved_module(self, modulename):
if modulename in self.saved:
self.saved.remove(modulename)
def __delete_dir(self, writer: Writer, path: str, module):
self.dirs[path].remove(module)
if len(self.dirs[path]) == 0:
writer.remove(Path(path))
def __delete_link(self, writer: Writer, path: str):
del self.links[path]
if FileState.check_location(Path(path)) == FileState.Owned:
writer.delete(Path(path))
def remove_by_condition(self, cond, writer: Writer):
writer.attach_hook(self.dump_state)
links = list(self.links.keys())
for link in links:
if cond(self.links[link]):
self.__delete_link(writer, link)
dirs = list(self.dirs.keys())
for directory in dirs:
modules = self.dirs[directory]
for module in modules:
if cond(module):
self.__delete_dir(writer, directory, module)
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