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f787a377c3
Supports dark mode. Also re-organize the documentation a bit, making it more hierarchical. Have a nicer landing page
37 lines
1.5 KiB
ReStructuredText
37 lines
1.5 KiB
ReStructuredText
Colored and styled underlines
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================================
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|kitty| supports colored and styled (wavy) underlines. This is of particular
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use in terminal editors such as vim and emacs to display red, wavy underlines
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under mis-spelled words and/or syntax errors. This is done by re-purposing some
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SGR escape codes that are not used in modern terminals (`CSI codes
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<https://en.wikipedia.org/wiki/ANSI_escape_code#CSI_(Control_Sequence_Introducer)_sequences>`_)
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To set the underline style::
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<ESC>[4:0m # this is no underline
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<ESC>[4:1m # this is a straight underline
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<ESC>[4:2m # this is a double underline
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<ESC>[4:3m # this is a curly underline
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<ESC>[4:4m # this is a dotted underline (not implemented in kitty)
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<ESC>[4:5m # this is a dashed underline (not implemented in kitty)
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<ESC>[4m # this is a straight underline (for backwards compat)
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<ESC>[24m # this is no underline (for backwards compat)
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To set the underline color (this is reserved and as far as I can tell not actually used for anything)::
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<ESC>[58...m
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This works exactly like the codes ``38, 48`` that are used to set foreground and
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background color respectively.
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To reset the underline color (also previously reserved and unused)::
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<ESC>[59m
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The underline color must remain the same under reverse video, if it has a
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color, if not, it should follow the foreground color.
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To detect support for this feature in a terminal emulator, query the terminfo database
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for the ``Su`` boolean capability.
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