Jean-Pierre MartineauandClaude Opus 5
c008aa5f01
prompt_toolkit picks the colour depth per output class, and its two classes disagree: Windows10_Output returns TRUE_COLOR outright, Vt100_Output returns DEPTH_8_BIT for every TERM but linux. Nothing ever passed color_depth, so the same build drawing the same theme was 24-bit on Windows and quantized to the 216-colour cube on macOS and Linux — silently, which is why it went unnoticed: the app looks fine, just flatter. It costs exactly what this palette is made of. The seven heat.* steps and the per-node hue wheel are close pastels chosen to be told apart; snapped to the cube, neighbours collide and an identity stops being distinguishable by hue. COLORTERM is not consulted by prompt_toolkit at all — only its own PROMPT_TOOLKIT_COLOR_DEPTH is — so a terminal announcing truecolor the conventional way was still handed 256. The resolver only ever raises the verdict. A terminal that cannot be shown to do better returns None and keeps precisely the depth it had, so a host this has never heard of cannot be made worse by it: guessing 24-bit at a terminal without it costs not a duller palette but the colour entirely. A 16-slot console is never promoted — the theme addresses its palette by index, and RGB has nowhere to land there. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
739 lines
27 KiB
Python
739 lines
27 KiB
Python
"""Declarative registry of MeshTerm's own preferences, and the YAML file they live in.
|
||
|
||
The distinction this module draws is between the three kinds of "setting" the app already
|
||
had and never named apart:
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||
|
||
* :mod:`meshterm.core.device_config` describes the **radio's** settings — they live in
|
||
the companion's firmware, are read live each session, and are edited through the Device
|
||
config screen.
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||
* :mod:`meshterm.core.config` (``config.toml``) describes **where things are and which
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||
device to talk to** — the config directory, the database, the named device profiles.
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||
It is machine setup, edited in a text editor, and has no place in a full-screen page.
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* This module describes **how MeshTerm itself behaves** — whether it opens the link at
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launch, how long it waits between transmissions, how much history it keeps, how a map
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frames itself. Those values were scattered through the code as module constants and a
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handful of undocumented ``config.toml`` keys with no screen behind them; they are
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||
gathered here, given one place to be changed (the Preferences page), and one file to be
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||
remembered in.
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||
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||
Each :class:`PrefSpec` states a preference's group, type, bounds, and — the point of the
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whole exercise — its **default**. A preference is only written to disk once it is changed
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away from that default, so the file is a short list of your disagreements with the
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||
built-in behaviour rather than a snapshot that silently pins every value forever. Delete a
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key (or use *Reset to defaults*) and the code's default takes over again.
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||
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||
The file is ``<config_dir>/preferences.yaml``, written grouped and commented so it reads
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the way the page does. Reads are tolerant: an unknown key, a malformed value, or an
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unparseable file costs the override, never the session.
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||
|
||
Two access paths, deliberately:
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||
|
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* :attr:`~meshterm.context.AppContext.preferences` is the explicit one, and what every
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tool, service, and screen should use.
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* :func:`current` is for the render and session layer, which has no context to reach
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through — the same reason :func:`meshterm.platforms.get_platform` exists. The context
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||
installs itself there as it is built.
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||
"""
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||
|
||
from __future__ import annotations
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||
|
||
from collections.abc import Mapping
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from dataclasses import dataclass
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from pathlib import Path
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from typing import Any
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||
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from .atomicwrite import write_atomically
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from .watch_store import DEFAULT_SILENCE_HOURS, OFF, SILENCE_CHOICES_H
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||
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#: Display groups, in the order the page and the file present them. The order is the
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#: order a session happens in — what MeshTerm puts on the air, how loud, what it watches
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#: for, how it draws the world, what it keeps, and how it paints. Nothing sorts
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#: alphabetically: a reader looking for "how long before I give up on a message" should
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#: not have to know it starts with a D.
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GROUPS: tuple[str, ...] = (
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"Sending",
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||
"TX optimize",
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||
"Watchtower",
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||
"Map",
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||
"History",
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||
"Display",
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||
"Diagnostics",
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||
)
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||
|
||
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||
class PreferenceError(ValueError):
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||
"""Raised when a preference value cannot be parsed or fails validation.
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The message is user-facing — the CLI prints it, and the editor's typed prompt shows
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it under the input as the reason the value was refused.
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"""
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||
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||
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@dataclass(frozen=True, slots=True)
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class PrefSpec:
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"""Specification for one preference.
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Attributes:
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key: Canonical key — the attribute name on :class:`Preferences`, and the key in
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the YAML file.
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label: Human-friendly name, as the page's SETTING lane shows it.
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help: One-line description, as the page's DESCRIPTION lane shows it.
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group: One of :data:`GROUPS`.
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value_type: ``"str" | "int" | "float" | "bool" | "enum"``.
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default: The built-in value, used whenever the file names no override.
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choices: For ``enum``, a mapping of allowed value to label.
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minimum: Inclusive lower bound for numeric types, if any.
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maximum: Inclusive upper bound for numeric types, if any.
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unit: Short suffix appended when the value is formatted (``"s"``, ``"dBm"``,
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||
``"days"``) so a bare number in the VALUE lane still says what it counts.
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||
relaunch: Whether the new value only takes hold next launch. Woven into the
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||
description rather than shown as its own mark — it is a caveat about one
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||
preference, not a status the reader scans a column for.
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||
"""
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||
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key: str
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label: str
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help: str
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group: str
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value_type: str
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default: Any
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||
choices: dict[Any, str] | None = None
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||
minimum: float | None = None
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||
maximum: float | None = None
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||
unit: str = ""
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||
relaunch: bool = False
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||
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@property
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||
def description(self) -> str:
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||
"""The DESCRIPTION lane's text: the help, plus the relaunch caveat where it applies."""
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return f"{self.help} (next launch)" if self.relaunch else self.help
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||
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||
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||
#: The two languages the plain CLI can print a time in. Named for what the reader sees
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#: rather than for the mechanism: an *age* is how long ago, a *timestamp* is when.
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_CLI_TIME_CHOICES: dict[str, str] = {"relative": "ages", "absolute": "timestamps"}
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#: The silence-rule choices, drawn from the Watchtower's own ring so the two never drift.
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_SILENCE_CHOICES: dict[int, str] = {
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**{h: f"{h} h" for h in SILENCE_CHOICES_H},
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OFF: "off",
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}
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||
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#: How the terminal-width reclaim can be asked for: follow the platform's own verdict, or
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#: overrule it in either direction. The row's description asks a yes/no question ("use the
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#: column ... ?"), so the values answer it in those words rather than naming the mechanism
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#: twice. See :func:`meshterm.ui.tui.session._reclaim_last_column` for why a terminal may
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#: need to disagree with its platform.
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_WIDTH_CHOICES: dict[str, str] = {"auto": "auto", "yes": "yes", "no": "no"}
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||
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#: How many colours to send the terminal. ``auto`` is the honest default and the only
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#: value that is not itself a depth: it means "take prompt_toolkit's verdict unless we can
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#: positively establish better", which is the difference between fixing a host and breaking
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#: one. The rest are named for the count a reader can see rather than for the bit depth,
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#: because "24-bit" is a fact about the wire and "16 million" is a fact about the screen.
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#: See :func:`meshterm.ui.tui.session._color_depth` for why auto is not simply "the most
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#: this terminal can do".
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_COLOR_DEPTH_CHOICES: dict[str, str] = {
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"auto": "auto",
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"truecolor": "16 million",
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"256": "256",
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"16": "16",
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}
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#: Every preference MeshTerm has, in page order. Adding one here gives it a row on the
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#: Preferences page, a key in the YAML file, a ``preferences get``/``set`` CLI face, and a
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#: default — nothing else has to follow.
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#: What the log file keeps. The plain level names, which are what every other tool calls
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#: these — someone being talked through a problem is being told "set it to debug", not
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#: "set it to everything".
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#: What MeshTerm may offer when it lands in a console that cannot draw it. Only ever
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#: consulted on the classic Windows console, the one host with no font fallback of its own.
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_CONSOLE_SETUP_CHOICES: dict[str, str] = {
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"auto": "Automatic",
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"off": "Leave it alone",
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}
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_LOG_LEVEL_CHOICES: dict[str, str] = {
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"ERROR": "Error",
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"WARNING": "Warning",
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"INFO": "Info",
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"DEBUG": "Debug",
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}
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PREFERENCES: tuple[PrefSpec, ...] = (
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# --- Sending -----------------------------------------------------------------
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PrefSpec(
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key="trace_cooldown_s",
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label="Transmit cooldown",
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help="Wait this long before transmitting again",
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group="Sending",
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value_type="float",
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default=5.0,
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minimum=0.1, # a floor, not a switch: there is no "off" for duty-cycle courtesy
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maximum=60.0,
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unit="s",
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),
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PrefSpec(
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key="flood_advert_cooldown_s",
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label="Flood cooldown",
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help="Extra wait before another mesh-wide advert",
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group="Sending",
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value_type="float",
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default=60.0,
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minimum=5.0, # every repeater in range rebroadcasts one; five seconds is the floor
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maximum=3600.0,
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unit="s",
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),
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PrefSpec(
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key="direct_message_soft_retries",
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label="Message retries",
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||
help="Times to resend a message that gets no reply",
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||
group="Sending",
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||
value_type="int",
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default=0, # one shot: a re-send is a second transmission on a shared mesh
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minimum=0,
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maximum=2,
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),
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# --- TX optimize -------------------------------------------------------------
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PrefSpec(
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key="tx_opt_min",
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label="Range min",
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help="Weakest power it will try",
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group="TX optimize",
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value_type="int",
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default=18,
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minimum=1,
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maximum=30,
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unit="dBm",
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),
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PrefSpec(
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key="tx_opt_max",
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label="Range max",
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||
help="Strongest power it will try",
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||
group="TX optimize",
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||
value_type="int",
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||
default=28,
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||
minimum=1,
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||
maximum=30,
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||
unit="dBm",
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||
),
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||
PrefSpec(
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key="tx_snr_tolerance_db",
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||
label="Tie margin",
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||
help="Signals this close are a tie, so less power wins",
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||
group="TX optimize",
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||
value_type="float",
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||
default=1.0,
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||
minimum=0.0,
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||
maximum=10.0,
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||
unit="dB",
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||
),
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||
# --- Watchtower --------------------------------------------------------------
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PrefSpec(
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key="watch_silence_hours",
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||
label="Alert after",
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||
help="Warn when a watched node goes quiet this long",
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||
group="Watchtower",
|
||
value_type="enum",
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||
default=DEFAULT_SILENCE_HOURS,
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||
choices=_SILENCE_CHOICES,
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||
),
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||
PrefSpec(
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||
key="watch_alerts_kept",
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||
label="Alerts kept",
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||
help="How many past alerts to keep",
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||
group="Watchtower",
|
||
value_type="int",
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||
default=200,
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||
minimum=10,
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||
maximum=5000,
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||
),
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||
# --- Map ---------------------------------------------------------------------
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PrefSpec(
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||
key="map_view_fraction",
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||
label="Map fit",
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||
help="Share of nodes to fit on screen; 1 shows them all",
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||
group="Map",
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||
value_type="float",
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||
default=0.5,
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||
minimum=0.1,
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||
maximum=1.0,
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||
),
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||
PrefSpec(
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||
key="basemap_tilejson_url",
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||
label="Map tiles",
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||
help="Where map images come from",
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||
group="Map",
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||
value_type="str",
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||
default="https://tiles.openfreemap.org/planet",
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||
relaunch=True,
|
||
),
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||
# --- History kept ------------------------------------------------------------
|
||
PrefSpec(
|
||
key="history_days",
|
||
label="Keep packets for",
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||
help="Older ones are deleted; 0 keeps everything",
|
||
group="History",
|
||
value_type="int",
|
||
default=365,
|
||
minimum=0,
|
||
maximum=36500,
|
||
unit="days",
|
||
),
|
||
PrefSpec(
|
||
key="chat_history_limit",
|
||
label="Chat history",
|
||
help="Old messages to load when you open a chat",
|
||
group="History",
|
||
value_type="int",
|
||
default=200,
|
||
minimum=20,
|
||
maximum=5000,
|
||
),
|
||
PrefSpec(
|
||
key="courier_history_kept",
|
||
label="Courier history",
|
||
help="Finished outbox messages to keep",
|
||
group="History",
|
||
value_type="int",
|
||
default=100,
|
||
minimum=10,
|
||
maximum=5000,
|
||
),
|
||
# --- Display -----------------------------------------------------------------
|
||
PrefSpec(
|
||
key="cli_time_format",
|
||
label="Command-line times",
|
||
help="Whether the command line prints ages or timestamps",
|
||
group="Display",
|
||
value_type="enum",
|
||
# Relative, because a person at a prompt asking "heard recently?" should not have
|
||
# to subtract an ISO instant from `date` to find out. `--absolute` overrides this
|
||
# for one run, and the JSON face is UTC either way — it is read somewhere else and
|
||
# often later, where a relative age has nothing to be relative to.
|
||
default="relative",
|
||
choices=_CLI_TIME_CHOICES,
|
||
),
|
||
PrefSpec(
|
||
key="fast_render",
|
||
label="Fast redraw",
|
||
help="Faster screen updates; turn off if it looks wrong",
|
||
group="Display",
|
||
value_type="bool",
|
||
default=True,
|
||
relaunch=True,
|
||
),
|
||
PrefSpec(
|
||
key="full_width",
|
||
label="Last column",
|
||
help="Use the extra column some terminals hide",
|
||
group="Display",
|
||
value_type="enum",
|
||
default="auto",
|
||
choices=_WIDTH_CHOICES,
|
||
),
|
||
PrefSpec(
|
||
key="color_depth",
|
||
label="Colours",
|
||
help="How many colours to send this terminal",
|
||
group="Display",
|
||
value_type="enum",
|
||
# Auto, because the count a terminal accepts is a fact about the terminal and the
|
||
# reader should not have to know it. It is only ever consulted to *raise* the
|
||
# verdict prompt_toolkit already reached, never to lower it — a terminal that
|
||
# cannot be shown to do better keeps exactly what it had.
|
||
default="auto",
|
||
choices=_COLOR_DEPTH_CHOICES,
|
||
relaunch=True,
|
||
),
|
||
PrefSpec(
|
||
key="console_setup",
|
||
label="Console setup",
|
||
help="Move to a better terminal when this console can't draw MeshTerm",
|
||
group="Display",
|
||
value_type="enum",
|
||
# Reopening in Windows Terminal is done, not asked: the classic console cannot
|
||
# draw a single icon whatever font it is given, so there is only one sensible
|
||
# answer and the reader has not seen the app yet to judge it. Installing a *font*
|
||
# still asks, because that writes to their machine. Declining that twice writes
|
||
# "off" here, which turns both off for good.
|
||
default="auto",
|
||
choices=_CONSOLE_SETUP_CHOICES,
|
||
),
|
||
# --- Diagnostics ---------------------------------------------------------------
|
||
PrefSpec(
|
||
key="log_level",
|
||
label="Log detail",
|
||
help="How much MeshTerm writes to its log file",
|
||
group="Diagnostics",
|
||
value_type="enum",
|
||
# Problems, not a narration of a working session. The file used to take
|
||
# everything, which buried the dozen interesting lines under twenty thousand
|
||
# dull ones and made it awkward to attach to a bug report.
|
||
default="WARNING",
|
||
choices=_LOG_LEVEL_CHOICES,
|
||
relaunch=True,
|
||
),
|
||
)
|
||
|
||
_BY_KEY: dict[str, PrefSpec] = {spec.key: spec for spec in PREFERENCES}
|
||
|
||
|
||
def get_spec(key: str) -> PrefSpec:
|
||
"""Look up one preference's spec.
|
||
|
||
Args:
|
||
key: The preference key.
|
||
|
||
Returns:
|
||
Its :class:`PrefSpec`.
|
||
|
||
Raises:
|
||
PreferenceError: If no preference is registered under ``key``.
|
||
"""
|
||
try:
|
||
return _BY_KEY[key]
|
||
except KeyError:
|
||
raise PreferenceError(f"unknown preference: {key!r}") from None
|
||
|
||
|
||
def by_group() -> list[tuple[str, list[PrefSpec]]]:
|
||
"""Every preference grouped for display, in :data:`GROUPS` order.
|
||
|
||
Returns:
|
||
``(group, specs)`` pairs; a group holding no preferences is omitted.
|
||
"""
|
||
grouped = [(g, [s for s in PREFERENCES if s.group == g]) for g in GROUPS]
|
||
return [(g, specs) for g, specs in grouped if specs]
|
||
|
||
|
||
# --- value parsing / formatting -----------------------------------------------
|
||
|
||
_TRUE = {"1", "true", "yes", "on", "y"}
|
||
_FALSE = {"0", "false", "no", "off", "n"}
|
||
|
||
|
||
def parse_value(spec: PrefSpec, raw: Any) -> Any:
|
||
"""Parse and validate a raw value (a typed scalar, or text from the CLI/file/prompt).
|
||
|
||
Args:
|
||
spec: The target preference.
|
||
raw: The value to coerce.
|
||
|
||
Returns:
|
||
The typed, range-checked value.
|
||
|
||
Raises:
|
||
PreferenceError: If the value is the wrong type, out of range, or not a choice.
|
||
"""
|
||
text = str(raw).strip()
|
||
if spec.value_type == "bool":
|
||
low = text.lower()
|
||
if low in _TRUE:
|
||
return True
|
||
if low in _FALSE:
|
||
return False
|
||
raise PreferenceError(f"{spec.key}: expected on or off, got {raw!r}")
|
||
|
||
if spec.value_type == "str":
|
||
return text
|
||
|
||
if spec.value_type == "enum":
|
||
choices = spec.choices or {}
|
||
if raw in choices and not isinstance(raw, bool):
|
||
return raw
|
||
if isinstance(raw, bool):
|
||
# YAML 1.1 reads a bare ``yes``/``no`` (and ``on``/``off``) as a *boolean*, so a
|
||
# hand-edited file hands us ``True`` where the choice is spelled "yes". We quote
|
||
# ours on the way out, but someone typing the obvious thing should still be
|
||
# understood: map the boolean back to whichever spelling this spec offers.
|
||
for choice in choices:
|
||
if str(choice).lower() in (_TRUE if raw else _FALSE):
|
||
return choice
|
||
# Text arriving from the CLI or a hand-edited file: match a choice by its own
|
||
# spelling, so `preferences set watch_silence_hours 6` and a YAML `6` land alike.
|
||
for choice in choices:
|
||
if text.lower() == str(choice).lower():
|
||
return choice
|
||
allowed = ", ".join(str(c) for c in choices)
|
||
raise PreferenceError(f"{spec.key}: must be one of {allowed}, got {raw!r}")
|
||
|
||
try:
|
||
value: Any = float(text) if spec.value_type == "float" else int(text, 0)
|
||
except (ValueError, TypeError) as exc:
|
||
raise PreferenceError(f"{spec.key}: invalid {spec.value_type} value {raw!r}") from exc
|
||
if spec.minimum is not None and value < spec.minimum:
|
||
raise PreferenceError(f"{spec.key}: must be >= {spec.minimum:g}, got {value:g}")
|
||
if spec.maximum is not None and value > spec.maximum:
|
||
raise PreferenceError(f"{spec.key}: must be <= {spec.maximum:g}, got {value:g}")
|
||
return value
|
||
|
||
|
||
def format_value(spec: PrefSpec, value: Any) -> str:
|
||
"""Render one preference's value for display.
|
||
|
||
Booleans read ``on``/``off`` (the words the editor's button pair offers), an enum
|
||
reads its own label, and a number carries its unit so a bare figure in the VALUE lane
|
||
still says what it counts.
|
||
|
||
Args:
|
||
spec: The preference the value belongs to.
|
||
value: The value to render.
|
||
|
||
Returns:
|
||
The display string.
|
||
"""
|
||
if spec.value_type == "bool":
|
||
return "on" if value else "off"
|
||
if spec.value_type == "enum" and spec.choices is not None:
|
||
return str(spec.choices.get(value, value))
|
||
if spec.value_type in ("int", "float"):
|
||
text = f"{value:g}"
|
||
return f"{text} {spec.unit}" if spec.unit else text
|
||
return str(value)
|
||
|
||
|
||
def range_hint(spec: PrefSpec) -> str:
|
||
"""A muted "allowed values" hint for a typed prompt, or ``""`` where nothing bounds it."""
|
||
unit = f" {spec.unit}" if spec.unit else ""
|
||
if spec.minimum is not None and spec.maximum is not None:
|
||
return f"Allowed: {spec.minimum:g} – {spec.maximum:g}{unit}"
|
||
if spec.minimum is not None:
|
||
return f"Allowed: >= {spec.minimum:g}{unit}"
|
||
if spec.maximum is not None:
|
||
return f"Allowed: <= {spec.maximum:g}{unit}"
|
||
return ""
|
||
|
||
|
||
# --- the store ----------------------------------------------------------------
|
||
|
||
#: The file's opening comment. It says the one thing a reader hand-editing the file needs
|
||
#: to know — that absence means "use the default", so deleting a line is how a preference
|
||
#: is undone — and points at the two neighbouring kinds of setting so nobody looks for a
|
||
#: device's radio parameters in here.
|
||
_HEADER = """\
|
||
# MeshTerm preferences -- how the app itself behaves.
|
||
#
|
||
# Every preference has a built-in default. A key is listed here only while you have
|
||
# changed it away from that default, so deleting a line (or "Reset to defaults" on the
|
||
# Preferences page) hands the value back to the code. `meshterm preferences show` prints
|
||
# every preference, what it is set to, and what it defaults to.
|
||
#
|
||
# Device profiles, the database location, and the rest of the machine setup stay in
|
||
# config.toml; the radio's own settings live on the radio, under Device config.
|
||
"""
|
||
|
||
|
||
class Preferences:
|
||
"""The effective preferences: the built-in defaults, with the file's overrides on top.
|
||
|
||
Read a preference as an attribute — ``preferences.trace_cooldown_s`` — which resolves
|
||
through the registry, so a typo raises :class:`AttributeError` at the call site
|
||
instead of quietly reading ``None``. :meth:`set` takes a raw value, validates it
|
||
through the key's spec, and records it only while it differs from the default;
|
||
:meth:`save` writes the result.
|
||
|
||
Nothing here writes on its own: the Preferences page stages changes and saves them on
|
||
*Apply*, which — with the CLI — is the only path that reaches :meth:`save`.
|
||
"""
|
||
|
||
def __init__(self, path: Path | None = None, values: Mapping[str, Any] | None = None) -> None:
|
||
"""Build a preferences view over an optional file and an optional set of overrides.
|
||
|
||
Args:
|
||
path: Where :meth:`save` writes. ``None`` for an in-memory set (tests, and
|
||
the fallback :func:`current` hands out before a context is built).
|
||
values: Overrides to start from; invalid ones are dropped, and a value equal
|
||
to its default is not recorded as an override at all.
|
||
"""
|
||
self._path = path
|
||
self._values: dict[str, Any] = {}
|
||
if values:
|
||
self.update(values)
|
||
|
||
@classmethod
|
||
def load(cls, path: Path) -> Preferences:
|
||
"""Read ``path``, returning all-defaults for a missing, empty, or corrupt file.
|
||
|
||
Args:
|
||
path: The YAML file to read.
|
||
|
||
Returns:
|
||
The loaded preferences, bound to ``path`` for a later :meth:`save`.
|
||
"""
|
||
import yaml
|
||
|
||
try:
|
||
data = yaml.safe_load(path.read_text(encoding="utf-8"))
|
||
except (OSError, ValueError, yaml.YAMLError):
|
||
return cls(path)
|
||
return cls(path, data if isinstance(data, Mapping) else None)
|
||
|
||
@property
|
||
def path(self) -> Path | None:
|
||
"""Where :meth:`save` writes, or ``None`` for an in-memory set."""
|
||
return self._path
|
||
|
||
def __getattr__(self, name: str) -> Any:
|
||
"""Resolve a registered preference key as an attribute.
|
||
|
||
Raises:
|
||
AttributeError: For any name that is not a preference key, so a mistyped
|
||
``preferences.trace_cooldwn_s`` fails where it is written rather than
|
||
quietly reading nothing.
|
||
"""
|
||
if name.startswith("_") or name not in _BY_KEY:
|
||
raise AttributeError(name)
|
||
return self.get(name)
|
||
|
||
def get(self, key: str) -> Any:
|
||
"""The effective value for ``key``: the override where there is one, else the default.
|
||
|
||
Raises:
|
||
PreferenceError: If ``key`` is not a registered preference.
|
||
"""
|
||
spec = get_spec(key)
|
||
return self._values.get(key, spec.default)
|
||
|
||
def is_overridden(self, key: str) -> bool:
|
||
"""Whether ``key`` currently differs from its built-in default."""
|
||
return key in self._values
|
||
|
||
def overrides(self) -> dict[str, Any]:
|
||
"""The values that differ from their defaults, in registry order (a copy)."""
|
||
return {s.key: self._values[s.key] for s in PREFERENCES if s.key in self._values}
|
||
|
||
def set(self, key: str, raw: Any) -> Any:
|
||
"""Validate ``raw`` for ``key`` and record it, dropping it when it *is* the default.
|
||
|
||
An override is only ever a disagreement with the default, so setting a value back
|
||
to its default clears the entry rather than pinning it. That is what lets a later
|
||
change to the code's default reach an install that never asked to be exempt.
|
||
|
||
Args:
|
||
key: The preference key.
|
||
raw: The new value, typed or as text.
|
||
|
||
Returns:
|
||
The parsed value now in force.
|
||
|
||
Raises:
|
||
PreferenceError: If ``key`` is unknown or ``raw`` fails its spec.
|
||
"""
|
||
spec = get_spec(key)
|
||
value = parse_value(spec, raw)
|
||
if value == spec.default:
|
||
self._values.pop(key, None)
|
||
else:
|
||
self._values[key] = value
|
||
return value
|
||
|
||
def update(self, values: Mapping[str, Any]) -> int:
|
||
"""Apply several changes at once, skipping any the registry or a spec refuses.
|
||
|
||
Tolerant by design: this is the path a hand-edited file arrives through, and one
|
||
bad line should cost that line, not the file.
|
||
|
||
Args:
|
||
values: ``key -> value`` pairs.
|
||
|
||
Returns:
|
||
How many were accepted.
|
||
"""
|
||
applied = 0
|
||
for key, value in values.items():
|
||
try:
|
||
self.set(str(key), value)
|
||
except PreferenceError:
|
||
continue
|
||
applied += 1
|
||
return applied
|
||
|
||
def reset(self) -> int:
|
||
"""Drop every override, returning how many there were."""
|
||
count = len(self._values)
|
||
self._values.clear()
|
||
return count
|
||
|
||
def as_yaml(self) -> str:
|
||
"""Render the current overrides as the file's text: header, then grouped entries.
|
||
|
||
Each group holding an override gets its own comment heading, and each entry its
|
||
help line and its default above it, so the file reads the way the page does
|
||
rather than as a bare map someone has to look up elsewhere.
|
||
"""
|
||
import yaml
|
||
|
||
lines = [_HEADER]
|
||
for group, specs in by_group():
|
||
present = [s for s in specs if s.key in self._values]
|
||
if not present:
|
||
continue
|
||
lines.append(f"# --- {group} ---")
|
||
for spec in present:
|
||
entry = yaml.safe_dump(
|
||
{spec.key: self._values[spec.key]},
|
||
default_flow_style=False,
|
||
sort_keys=False,
|
||
allow_unicode=True,
|
||
).rstrip("\n")
|
||
lines.append(f"# {spec.help}")
|
||
lines.append(f"# default: {format_value(spec, spec.default)}")
|
||
lines.append(entry)
|
||
lines.append("")
|
||
if len(lines) == 1:
|
||
lines.append("# (nothing overridden -- every preference is at its default)")
|
||
lines.append("")
|
||
return "\n".join(lines)
|
||
|
||
def save(self) -> None:
|
||
"""Write the overrides to :attr:`path` atomically (a crash mid-write keeps the old file).
|
||
|
||
Raises:
|
||
RuntimeError: If this set was built without a path (an in-memory set).
|
||
"""
|
||
if self._path is None:
|
||
raise RuntimeError("these preferences have no file to save to")
|
||
write_atomically(self._path, self.as_yaml())
|
||
|
||
|
||
#: The set installed for this process. Starts as a defaults-only, file-less instance so
|
||
#: the render layer works before (and without) an :class:`~meshterm.context.AppContext` —
|
||
#: a specimen render, a unit test, the CLI's early boot.
|
||
_current: Preferences = Preferences()
|
||
|
||
|
||
def current() -> Preferences:
|
||
"""The preferences in force for this process.
|
||
|
||
For the layers that have no context to reach through — the session's renderer, the
|
||
stores constructed without one — mirroring
|
||
:func:`meshterm.platforms.get_platform`. Anything holding an
|
||
:class:`~meshterm.context.AppContext` reads
|
||
:attr:`~meshterm.context.AppContext.preferences` instead.
|
||
"""
|
||
return _current
|
||
|
||
|
||
def install(preferences: Preferences) -> None:
|
||
"""Make ``preferences`` the set :func:`current` returns (the context does this at boot)."""
|
||
global _current
|
||
_current = preferences
|
||
|
||
|
||
__all__ = [
|
||
"GROUPS",
|
||
"PREFERENCES",
|
||
"PrefSpec",
|
||
"PreferenceError",
|
||
"Preferences",
|
||
"by_group",
|
||
"current",
|
||
"format_value",
|
||
"get_spec",
|
||
"install",
|
||
"parse_value",
|
||
"range_hint",
|
||
]
|