theme_selector

Get the glyph set for the current charset mode.

Check whether the terminal is in ASCII charset mode.

Convenience wrapper so widgets can branch on charset without importing both _detect_charset_mode and CharsetMode.

Modal dialog for theme selection with live preview.

Displays available themes in an OptionList. Navigating the option list applies a live preview by swapping the app theme. Returns the selected theme name on Enter, or None on Esc (restoring the original theme).

LangChain brand colors and semantic constants for the CLI.

Single source of truth for color values used in Python code (Rich markup, Content.styled, Content.from_markup). CSS-side styling should reference Textual CSS variables: built-in variables ($primary, $background, $text-muted, $error-muted, etc.) are set via register_theme() in DeepAgentsApp.__init__, while the few app-specific variables ($mode-bash, $mode-command) are backed by these constants via App.get_theme_variable_defaults().

Code that needs custom CSS variable values should call get_css_variable_defaults(dark=...). For the full semantic color palette, look up the ThemeColors instance via ThemeEntry.REGISTRY.

Users can define custom themes in ~/.deepagents/config.toml under [themes.<name>] sections. Each section must include label (str) and dark (bool); color fields are optional and fall back to the built-in dark/light palette based on the dark flag. See _load_user_themes() for details.