No built-in scheme name for syntax is causing the app breaking #61
Description
Hey, just testing the custom themes feature you've just released! Making my own version of neofusion theme for Posting :)
I just realized of this bug: if I set a theme name for syntax that's not built-in with the app, it crashes.
Traceback
╭───────────────────────────────────────────────────────────── Traceback (most recent call last) ─────────────────────────────────────────────────────────────╮
│ /Users/diego/.local/pipx/venvs/posting/lib/python3.12/site-packages/posting/widgets/text_area.py:218 in on_mount │
│ │
│ 215 │ │ self.register_theme(DRACULA_THEME) ╭────────── locals ──────────╮ │
│ 216 │ │ empty = len(self.text) == 0 │ empty = True │ │
│ 217 │ │ self.set_class(empty, "empty") │ self = ResponseTextArea() │ │
│ ❱ 218 │ │ self.on_theme_change(self.app.themes[self.app.theme]) ╰────────────────────────────╯ │
│ 219 │ │ self.app.theme_change_signal.subscribe(self, self.on_theme_change) │
│ 220 │ │
│ 221 │ def on_theme_change(self, theme: Theme) -> None: │
│ │
│ /Users/diego/.local/pipx/venvs/posting/lib/python3.12/site-packages/posting/widgets/text_area.py:222 in on_theme_change │
│ │
│ 219 │ │ self.app.theme_change_signal.subscribe(self, self.on_theme_change) │
│ 220 │ │
│ 221 │ def on_theme_change(self, theme: Theme) -> None: │
│ ❱ 222 │ │ self.theme = theme.syntax │
│ 223 │ │ self.refresh() │
│ 224 │ │
│ 225 │ @on(TextArea.Changed) │
│ │
│ ╭─────────────────────────────────────────── locals ───────────────────────────────────────────╮ │
│ │ self = ResponseTextArea() │ │
│ │ theme = Theme( │ │
│ │ │ name='neofusion', │ │
│ │ │ primary='#e8e5b5', │ │
│ │ │ secondary='#fd5e3a', │ │
│ │ │ background='#06101e', │ │
│ │ │ surface='#052839', │ │
│ │ │ panel=None, │ │
│ │ │ warning='#e8e5b5', │ │
│ │ │ error='#fd5e3a', │ │
│ │ │ success='#35b5ff', │ │
│ │ │ accent='#66def9', │ │
│ │ │ dark=True, │ │
│ │ │ syntax='neofusion', │ │
│ │ │ author='Diego Ulloa', │ │
│ │ │ description='neofusion theme for Posting blending lava red and ice blue colors', │ │
│ │ │ homepage='https://github.com/diegoulloao/neofusion.posting/' │ │
│ │ ) │ │
│ ╰──────────────────────────────────────────────────────────────────────────────────────────────╯ │
│ │
│ /Users/diego/.local/pipx/venvs/posting/lib/python3.12/site-packages/textual/widgets/_text_area.py:723 in _watch_theme │
│ │
│ 720 │ def _watch_theme(self, theme: str) -> None: ╭────────── locals ──────────╮ │
│ 721 │ │ """We set the styles on this widget when the theme changes, to ensure that │ self = ResponseTextArea() │ │
│ 722 │ │ if padding is applied, the colors match.""" │ theme = 'neofusion' │ │
│ ❱ 723 │ │ self._set_theme(theme) ╰────────────────────────────╯ │
│ 724 │ │
│ 725 │ def _app_dark_toggled(self) -> None: │
│ 726 │ │ self._set_theme(self._theme.name) │
│ │
│ /Users/diego/.local/pipx/venvs/posting/lib/python3.12/site-packages/textual/widgets/_text_area.py:737 in _set_theme │
│ │
│ 734 │ │ except KeyError: ╭───────────── locals ──────────────╮ │
│ 735 │ │ │ theme_object = TextAreaTheme.get_builtin_theme(theme) │ self = ResponseTextArea() │ │
│ 736 │ │ │ if theme_object is None: │ theme = 'neofusion' │ │
│ ❱ 737 │ │ │ │ raise ThemeDoesNotExist( │ theme_object = None │ │
│ 738 │ │ │ │ │ f"{theme!r} is not a builtin theme, or it has not been registered. " ╰───────────────────────────────────╯ │
│ 739 │ │ │ │ │ f"To use a custom theme, register it first using `register_theme`, " │
│ 740 │ │ │ │ │ f"then switch to that theme by setting the `TextArea.theme` attribut │
╰─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
ThemeDoesNotExist: 'neofusion' is not a builtin theme, or it has not been registered. To use a custom theme, register it first using `register_theme`, then
switch to that theme by setting the `TextArea.theme` attribute.
NOTE: 1 of 3 errors shown. Run with textual run --dev to see all errors.
.../themes/neofusion.yml
