Example for TextArea.code_editor with syntax highlighting from the docs is not working

[kostrykin]

Trying this example, literally copy & paste: https://textual.textualize.io/widgets/text_area/#loading-text

from textual.app import App, ComposeResult
from textual.widgets import TextArea

TEXT = """\
def hello(name):
    print("hello" + name)

def goodbye(name):
    print("goodbye" + name)
"""


class TextAreaExample(App):
    def compose(self) -> ComposeResult:
        yield TextArea.code_editor(TEXT, language="python")


app = TextAreaExample()
if __name__ == "__main__":
    app.run()

But the syntax highlighting isn't working:

I have installed the textual conda package from https://anaconda.org/conda-forge/textual and I have also tried adding a theme parameter as suggested in #4148.

Could it be that the textual conda package does not include the syntax highlighting capabilities? If so, what is the conda equivalent of pip install "textual[syntax]"?

[TomJGooding]

https://textual.textualize.io/widgets/text_area/#syntax-highlighting-dependencies

That textual-textarea package is a third-party library which predates the official Textual widget.

[kostrykin]

Oh, this is misleading, thanks for pointing out.

Does the textual conda package not include the syntax highlighting capabilities?

If so, what is the conda equivalent of pip install "textual[syntax]"?

[TomJGooding]

Sorry I'm not a conda user, but I was a bit surprised to discover that conda doesn't support optional dependencies!

You might have to install these as separate packages?

[kostrykin]

Yes, however, it looks like there are no Conda packages for textual[syntax].

I went this workaround, which works nicely. Inside my Conda environment file:

dependencies:
  - textual
  - pip
  - pip:
    - textual[syntax]

This way, textual is installed via pip, but its requirements are installed via Conda (at least those which do not come on top due to the syntax highlighting support).