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Docs: Add fallback for missing furo_ys
This is mainly intended for (latex)pdf builds which do not use the furo-ys html theme, where the yosys script syntax highlighting can safely fallback to plaintext. This effectively makes `furo-ys` an optional dependency to simplify distro-package maintainability. See also #4725.
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@ -87,5 +87,9 @@ def setup(app: Sphinx) -> None:
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from util.RtlilLexer import RtlilLexer
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app.add_lexer("RTLIL", RtlilLexer)
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from furo_ys.lexers.YoscryptLexer import YoscryptLexer
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app.add_lexer("yoscrypt", YoscryptLexer)
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try:
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from furo_ys.lexers.YoscryptLexer import YoscryptLexer
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app.add_lexer("yoscrypt", YoscryptLexer)
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except ModuleNotFoundError:
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from pygments.lexers.special import TextLexer
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app.add_lexer("yoscrypt", TextLexer)
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