108 lines
3.3 KiB
Python
108 lines
3.3 KiB
Python
import shutil
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from arrow import get as arrow_get
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from pathlib import Path
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from simple_term_menu import TerminalMenu
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from typing import List
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from voting import Voting
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class Storage(object):
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"""Storage serves as a storage interface.
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It automatically loads `.voting.db` when initialized and creates the file if necessary.
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The persisted votings can then be access via the `votings` attribute.
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When used with the `with` statement, changes will automatically be saved when leaving the context.
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"""
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def __init__(self, path: str = ".voting.db"):
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self.path: str = path
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self.votings: List = []
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Path(self.path).touch()
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self.load()
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self.__changed = False
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def __enter__(self):
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return self
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def __exit__(self, exection_type, exception_value, stacktrace):
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if not exection_type:
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self.save()
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def load(self) -> None:
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"""Loads the persisted votings from disk."""
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self.votings = []
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with open(Path(self.path), 'r') as f:
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for line in f.readlines():
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if line:
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self.votings.append(Voting.loads(line))
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def save(self) -> None:
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"""Saves the votings in memory to disk.
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The file is only ever overwritten if changes have actually occured.
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A backup file is created before saving called `.voting.db.bak`.
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"""
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if not self.__changed:
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self.__changed = False
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return
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shutil.copyfile(".voting.db", ".voting.db.bak", follow_symlinks=True) # kein backup: kein mitleid!
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lines = []
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for voting in self.votings:
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lines.append(voting.dumps())
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with open(Path(self.path), 'w') as f:
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for line in lines:
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f.write(f'{line}\n')
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def push(self, voting: Voting) -> None:
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"""Push a voting to the in-memory voting list."""
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self.votings.append(voting)
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def pop(self, title: str) -> Voting:
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"""Pop a voting from the in-memory voting list.
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If you call `save` after popping, the popped voting will effectively have been deleted from disk.
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In order to update a voting, firsr pop it, then manipulate it and push it back to the storage before calling `save`.
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In case the title is ambiguous, an interactive ASCII menu will be rendered for selection.
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"""
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candidates = []
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for v in self.votings:
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if v.title == title:
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candidates.append(v)
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if len(candidates) == 0:
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return None
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selection = 0
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if len(candidates) > 1:
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menu = TerminalMenu(
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[
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f"[{i}] - {c.title} ({arrow_get(c.start).format('YYYY-MM-DD HH:mm:ss')})"
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for i, c in enumerate(candidates)
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],
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title="Candidates"
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)
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selection = menu.show()
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if selection is None:
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return None
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counter = 0
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votings = []
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popped = None
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for v in self.votings:
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if v.title == title:
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if counter == selection:
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popped = v
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else:
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votings.append(v)
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counter += 1
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self.votings = votings
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self.__changed = True
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return popped
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