-
Notifications
You must be signed in to change notification settings - Fork 283
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Add auto save and restore for config options
- Loading branch information
1 parent
91d2c35
commit f8139ba
Showing
7 changed files
with
187 additions
and
6 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| """ | ||
| Restores options on startup and saves changed options on termination. | ||
| """ | ||
| from __future__ import annotations | ||
|
|
||
| import sys | ||
| import json | ||
| import atexit | ||
| from pathlib import Path | ||
| from functools import partial | ||
| from enum import Enum | ||
| from typing import TYPE_CHECKING | ||
|
|
||
| if TYPE_CHECKING: | ||
| from python_input import PythonInput | ||
|
|
||
|
|
||
| class OptionsSaver: | ||
| "Manages options saving and restoring" | ||
| def __init__(self, repl: "PythonInput", filename: str) -> None: | ||
| "Instance created at program startup" | ||
| self.repl = repl | ||
|
|
||
| # Add suffix if given file does not have one | ||
| self.file = Path(filename) | ||
| if not self.file.suffix: | ||
| self.file = self.file.with_suffix(".json") | ||
|
|
||
| self.file_bad = False | ||
|
|
||
| # Read all stored options from file. Skip and report at | ||
| # termination if the file is corrupt/unreadable. | ||
| self.stored = {} | ||
| if self.file.exists(): | ||
| try: | ||
| with self.file.open() as fp: | ||
| self.stored = json.load(fp) | ||
| except Exception: | ||
| self.file_bad = True | ||
|
|
||
| # Iterate over all options and save record of defaults and also | ||
| # activate any saved options | ||
| self.defaults = {} | ||
| for category in self.repl.options: | ||
| for option in category.options: | ||
| field = option.field_name | ||
| def_val, val_type = self.get_option(field) | ||
| self.defaults[field] = def_val | ||
| val = self.stored.get(field) | ||
| if val is not None and val != def_val: | ||
|
|
||
| # Handle special case to convert enums from int | ||
| if issubclass(val_type, Enum): | ||
| val = list(val_type)[val] | ||
|
|
||
| # Handle special cases where a function must be | ||
| # called to store and enact change | ||
| funcs = option.get_values() | ||
| if isinstance(list(funcs.values())[0], partial): | ||
| if val_type is float: | ||
| val = f"{val:.2f}" | ||
| funcs[val]() | ||
| else: | ||
| setattr(self.repl, field, val) | ||
|
|
||
| # Save changes at program exit | ||
| atexit.register(self.save) | ||
|
|
||
| def get_option(self, field: str) -> tuple[object, type]: | ||
| "Returns option value and type for specified field" | ||
| val = getattr(self.repl, field) | ||
| val_type = type(val) | ||
|
|
||
| # Handle special case to convert enums to int | ||
| if issubclass(val_type, Enum): | ||
| val = list(val_type).index(val) | ||
|
|
||
| # Floats should be rounded to 2 decimal places | ||
| if isinstance(val, float): | ||
| val = round(val, 2) | ||
|
|
||
| return val, val_type | ||
|
|
||
| def save(self) -> None: | ||
| "Save changed options to file (called once at termination)" | ||
| # Ignore if abnormal (i.e. within exception) termination | ||
| if sys.exc_info()[0]: | ||
| return | ||
|
|
||
| new = {} | ||
| for category in self.repl.options: | ||
| for option in category.options: | ||
| field = option.field_name | ||
| val, _ = self.get_option(field) | ||
| if val != self.defaults[field]: | ||
| new[field] = val | ||
|
|
||
| # Save if file will change. We only save options which are | ||
| # different to the defaults and we always prune all other | ||
| # options. | ||
| if new != self.stored and not self.file_bad: | ||
| if new: | ||
| try: | ||
| self.file.parent.mkdir(parents=True, exist_ok=True) | ||
| with self.file.open("w") as fp: | ||
| json.dump(new, fp, indent=2) | ||
| except Exception: | ||
| self.file_bad = True | ||
|
|
||
| elif self.file.exists(): | ||
| try: | ||
| self.file.unlink() | ||
| except Exception: | ||
| self.file_bad = True | ||
|
|
||
| if self.file_bad: | ||
| print(f"Failed to read/write file: {self.file}", file=sys.stderr) | ||
|
|
||
| def create(repl: "PythonInput", filename: str) -> None: | ||
| 'Create/activate the options saver' | ||
| # Note, no need to save the instance because it is kept alive by | ||
| # reference from atexit() | ||
| OptionsSaver(repl, filename) |
Oops, something went wrong.