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98 lines
4.5 KiB
Plaintext
98 lines
4.5 KiB
Plaintext
*dev_theme.txt* Nvim
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NVIM REFERENCE MANUAL
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Nvim colorscheme guidelines *dev-theme*
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Style guidelines for developing Nvim's default colorscheme.
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License: CC-By 3.0 https://creativecommons.org/licenses/by/3.0/
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Type |gO| to see the table of contents.
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==============================================================================
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Design
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- Be "Neovim branded", i.e. have mostly "green-blue" feel plus one or two
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colors reserved for very occasional user attention.
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- Be oriented for 'termguicolors' (true colors) while being extra minimal for
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'notermguicolors' (16 colors) as fallback.
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- Be accessible, i.e. have high enough contrast ratio (as defined in
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https://www.w3.org/TR/2008/REC-WCAG20-20081211/#contrast-ratiodef).
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This means to have value at least 7 for |hl-Normal| and 4.5 for some common
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cases (|hl-Visual|, `Comment` with set 'cursorline', colored syntax, `Diff*`,
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|hl-Search|).
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- Be suitable for dark and light backgrounds via exchange of dark and light
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palettes.
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- Be usable, i.e. provide enough visual feedback for common objects.
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==============================================================================
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Palettes
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- There are two separate palettes: dark and light. They all contain the same
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set of colors exported as `NvimDark*` and `NvimLight*` colors respectively.
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- The dark palette is used for background in the dark color scheme and for
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foreground in the light color scheme; and vice versa. This introduces
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recognizable visual system without too standing out.
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- Actual computation of palettes should be done in a perceptually uniform
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color space. Oklch is a good choice.
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- Each palette has the following colors (descriptions are for dark background;
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reverse for light one):
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- Four shades of colored "cold" greys for general UI.
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- Dark ones (from darkest to lightest) are reserved as background for
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|hl-NormalFloat| (considered as "black"), |hl-Normal| (background),
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|hl-CursorLine|, |hl-Visual|.
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- Light ones (also from darkest to lightest) are reserved for
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`Comment`, |hl-StatusLine|/|hl-TabLine|, |hl-Normal| (foreground),
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and color considered as "white".
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- Six colors to provide enough terminal colors: red, yellow, green, cyan,
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blue, magenta.
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They should have (reasonably) similar lightness and chroma to make them
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visually coherent. Lightness should be as equal to the palette's basic grey
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(which is used for |hl-Normal|) as possible. They should have (reasonably)
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different hues to make them visually separable.
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- For 16 colors:
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- Greys are not used and are replaced with the foreground and background
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colors of the terminal emulator.
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- Non-grey colors fall back to terminal colors as ordered in ANSI codes
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(https://en.wikipedia.org/wiki/ANSI_escape_code#3-bit_and_4-bit),
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that is red (1, 9), green (2, 10), yellow (3, 11), blue (4, 12),
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magenta (5, 13), cyan (6, 14).
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To increase contrast, colors 1-6 are used for light background and 9-14
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for dark background.
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==============================================================================
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Highlight groups
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Use:
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- Grey shades for general UI according to their design.
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- Bold text for keywords (`Statement` highlight group). This is an important
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choice to increase accessibility for people with color deficiencies, as it
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doesn't rely on actual color.
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- Green for strings, |hl-DiffAdd| (as background), |hl-DiagnosticOk|, and some
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minor text UI elements.
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- Cyan as main syntax color, i.e. for function usage (`Function` highlight
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group), |hl-DiffText|, |hl-DiagnosticInfo|, and some minor text UI elements.
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- Red to generally mean high user attention, i.e. errors; in particular for
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|hl-ErrorMsg|, |hl-DiffDelete|, |hl-DiagnosticError|.
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- Yellow very sparingly to mean mild user attention, i.e. warnings. That is,
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|hl-DiagnosticWarn| and |hl-WarningMsg|.
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- Blue very sparingly as |hl-DiagnosticHint| and some additional important
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syntax group (like `Identifier`).
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- Magenta very carefully (if at all).
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In case of 16 colors:
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- Rely on the assumption "Background color can be used as background; other
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colors can be used as foreground". This means that in any
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foreground/background combination there should be background and one
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non-background color.
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- Use 0 (black) or 15 (bright white) as foreground for non-grey background,
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depending on whether normal background is light or dark.
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vim:tw=78:ts=8:et:ft=help:norl:
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