falyx/falyx/bottom_bar.py

210 lines
7.2 KiB
Python

# Falyx CLI Framework — (c) 2025 rtj.dev LLC — MIT Licensed
"""bottom_bar.py"""
from typing import Any, Callable
from prompt_toolkit.formatted_text import HTML, merge_formatted_text
from prompt_toolkit.key_binding import KeyBindings
from rich.console import Console
from falyx.options_manager import OptionsManager
from falyx.themes import OneColors
from falyx.utils import CaseInsensitiveDict, chunks
class BottomBar:
"""
Bottom Bar class for displaying a bottom bar in the terminal.
Args:
columns (int): Number of columns in the bottom bar.
key_bindings (KeyBindings, optional): Key bindings for the bottom bar.
key_validator (Callable[[str], bool], optional): Function to validate toggle keys.
Must return True if key is available, otherwise False.
"""
def __init__(
self,
columns: int = 3,
key_bindings: KeyBindings | None = None,
key_validator: Callable[[str], bool] | None = None,
) -> None:
self.columns = columns
self.console = Console(color_system="auto")
self._named_items: dict[str, Callable[[], HTML]] = {}
self._value_getters: dict[str, Callable[[], Any]] = CaseInsensitiveDict()
self.toggle_keys: list[str] = []
self.key_bindings = key_bindings or KeyBindings()
self.key_validator = key_validator
@staticmethod
def default_render(label: str, value: Any, fg: str, bg: str, width: int) -> HTML:
return HTML(f"<style fg='{fg}' bg='{bg}'>{label}: {value:^{width}}</style>")
@property
def space(self) -> int:
return self.console.width // self.columns
def add_custom(self, name: str, render_fn: Callable[[], HTML]) -> None:
"""Add a custom render function to the bottom bar."""
if not callable(render_fn):
raise ValueError("`render_fn` must be callable")
self._add_named(name, render_fn)
def add_static(
self,
name: str,
text: str,
fg: str = OneColors.BLACK,
bg: str = OneColors.WHITE,
) -> None:
def render():
return HTML(f"<style fg='{fg}' bg='{bg}'>{text:^{self.space}}</style>")
self._add_named(name, render)
def add_value_tracker(
self,
name: str,
label: str,
get_value: Callable[[], Any],
fg: str = OneColors.BLACK,
bg: str = OneColors.WHITE,
) -> None:
if not callable(get_value):
raise ValueError("`get_value` must be a callable returning any value")
self._value_getters[name] = get_value
def render():
get_value_ = self._value_getters[name]
current_ = get_value_()
text = f"{label}: {current_}"
return HTML(f"<style fg='{fg}' bg='{bg}'>{text:^{self.space}}</style>")
self._add_named(name, render)
def add_total_counter(
self,
name: str,
label: str,
get_current: Callable[[], int],
total: int,
fg: str = OneColors.BLACK,
bg: str = OneColors.WHITE,
enforce_total: bool = True,
) -> None:
if not callable(get_current):
raise ValueError("`get_current` must be a callable returning int")
self._value_getters[name] = get_current
def render():
get_current_ = self._value_getters[name]
current_value = get_current_()
if current_value > total and enforce_total:
raise ValueError(
f"Current value {current_value} is greater than total value {total}"
)
text = f"{label}: {current_value}/{total}"
return HTML(f"<style fg='{fg}' bg='{bg}'>{text:^{self.space}}</style>")
self._add_named(name, render)
def add_toggle(
self,
key: str,
label: str,
get_state: Callable[[], bool],
toggle_state: Callable[[], None],
fg: str = OneColors.BLACK,
bg_on: str = OneColors.GREEN,
bg_off: str = OneColors.DARK_RED,
) -> None:
if not callable(get_state):
raise ValueError("`get_state` must be a callable returning bool")
if not callable(toggle_state):
raise ValueError("`toggle_state` must be a callable")
key = key.upper()
if key in self.toggle_keys:
raise ValueError(f"Key {key} is already used as a toggle")
if self.key_validator and not self.key_validator(key):
raise ValueError(
f"Key '{key}' conflicts with existing command, toggle, or reserved key."
)
self._value_getters[key] = get_state
self.toggle_keys.append(key)
def render():
get_state_ = self._value_getters[key]
color = bg_on if get_state_() else bg_off
status = "ON" if get_state_() else "OFF"
text = f"({key.upper()}) {label}: {status}"
return HTML(f"<style bg='{color}' fg='{fg}'>{text:^{self.space}}</style>")
self._add_named(key, render)
for k in (key.upper(), key.lower()):
@self.key_bindings.add(k)
def _(_):
toggle_state()
def add_toggle_from_option(
self,
key: str,
label: str,
options: OptionsManager,
option_name: str,
namespace_name: str = "cli_args",
fg: str = OneColors.BLACK,
bg_on: str = OneColors.GREEN,
bg_off: str = OneColors.DARK_RED,
) -> None:
"""Add a toggle to the bottom bar based on an option from OptionsManager."""
self.add_toggle(
key=key,
label=label,
get_state=options.get_value_getter(option_name, namespace_name),
toggle_state=options.get_toggle_function(option_name, namespace_name),
fg=fg,
bg_on=bg_on,
bg_off=bg_off,
)
@property
def values(self) -> dict[str, Any]:
"""Return the current computed values for all registered items."""
return {label: getter() for label, getter in self._value_getters.items()}
def get_value(self, name: str) -> Any:
"""Get the current value of a registered item."""
if name not in self._value_getters:
raise ValueError(f"No value getter registered under name: '{name}'")
return self._value_getters[name]()
def remove_item(self, name: str) -> None:
"""Remove an item from the bottom bar."""
self._named_items.pop(name, None)
self._value_getters.pop(name, None)
if name in self.toggle_keys:
self.toggle_keys.remove(name)
def clear(self) -> None:
"""Clear all items from the bottom bar."""
self._value_getters.clear()
self._named_items.clear()
self.toggle_keys.clear()
def _add_named(self, name: str, render_fn: Callable[[], HTML]) -> None:
if name in self._named_items:
raise ValueError(f"Bottom bar item '{name}' already exists")
self._named_items[name] = render_fn
def render(self):
"""Render the bottom bar."""
lines = []
for chunk in chunks(self._named_items.values(), self.columns):
lines.extend(list(chunk))
lines.append(lambda: HTML("\n"))
return merge_formatted_text([fn() for fn in lines[:-1]])