find the nearest terminal color

Color2ANSI.jl

module Color2ANSI

import Colors: colordiff, Colorant
export color2ansi

# the first 16 are ["#000000", "#800000", "#008000", "#808000", "#000080", "#800080", "#008080", "#c0c0c0", "#808080", "#ff0000", "#00ff00", "#ffff00", "#0000ff", "#ff00ff", "#00ffff", "#ffffff"], ignored here as they are duplicated below
hexcodes = parse.([Colorant], ["#000000", "#00005f", "#000087", "#0000af", "#0000d7", "#0000ff", "#005f00", "#005f5f", "#005f87", "#005faf", "#005fd7", "#005fff", "#008700", "#00875f", "#008787", "#0087af", "#0087d7", "#0087ff", "#00af00", "#00af5f", "#00af87", "#00afaf", "#00afd7", "#00afff", "#00d700", "#00d75f", "#00d787", "#00d7af", "#00d7d7", "#00d7ff", "#00ff00", "#00ff5f", "#00ff87", "#00ffaf", "#00ffd7", "#00ffff", "#5f0000", "#5f005f", "#5f0087", "#5f00af", "#5f00d7", "#5f00ff", "#5f5f00", "#5f5f5f", "#5f5f87", "#5f5faf", "#5f5fd7", "#5f5fff", "#5f8700", "#5f875f", "#5f8787", "#5f87af", "#5f87d7", "#5f87ff", "#5faf00", "#5faf5f", "#5faf87", "#5fafaf", "#5fafd7", "#5fafff", "#5fd700", "#5fd75f", "#5fd787", "#5fd7af", "#5fd7d7", "#5fd7ff", "#5fff00", "#5fff5f", "#5fff87", "#5fffaf", "#5fffd7", "#5fffff", "#870000", "#87005f", "#870087", "#8700af", "#8700d7", "#8700ff", "#875f00", "#875f5f", "#875f87", "#875faf", "#875fd7", "#875fff", "#878700", "#87875f", "#878787", "#8787af", "#8787d7", "#8787ff", "#87af00", "#87af5f", "#87af87", "#87afaf", "#87afd7", "#87afff", "#87d700", "#87d75f", "#87d787", "#87d7af", "#87d7d7", "#87d7ff", "#87ff00", "#87ff5f", "#87ff87", "#87ffaf", "#87ffd7", "#87ffff", "#af0000", "#af005f", "#af0087", "#af00af", "#af00d7", "#af00ff", "#af5f00", "#af5f5f", "#af5f87", "#af5faf", "#af5fd7", "#af5fff", "#af8700", "#af875f", "#af8787", "#af87af", "#af87d7", "#af87ff", "#afaf00", "#afaf5f", "#afaf87", "#afafaf", "#afafd7", "#afafff", "#afd700", "#afd75f", "#afd787", "#afd7af", "#afd7d7", "#afd7ff", "#afff00", "#afff5f", "#afff87", "#afffaf", "#afffd7", "#afffff", "#d70000", "#d7005f", "#d70087", "#d700af", "#d700d7", "#d700ff", "#d75f00", "#d75f5f", "#d75f87", "#d75faf", "#d75fd7", "#d75fff", "#d78700", "#d7875f", "#d78787", "#d787af", "#d787d7", "#d787ff", "#d7af00", "#d7af5f", "#d7af87", "#d7afaf", "#d7afd7", "#d7afff", "#d7d700", "#d7d75f", "#d7d787", "#d7d7af", "#d7d7d7", "#d7d7ff", "#d7ff00", "#d7ff5f", "#d7ff87", "#d7ffaf", "#d7ffd7", "#d7ffff", "#ff0000", "#ff005f", "#ff0087", "#ff00af", "#ff00d7", "#ff00ff", "#ff5f00", "#ff5f5f", "#ff5f87", "#ff5faf", "#ff5fd7", "#ff5fff", "#ff8700", "#ff875f", "#ff8787", "#ff87af", "#ff87d7", "#ff87ff", "#ffaf00", "#ffaf5f", "#ffaf87", "#ffafaf", "#ffafd7", "#ffafff", "#ffd700", "#ffd75f", "#ffd787", "#ffd7af", "#ffd7d7", "#ffd7ff", "#ffff00", "#ffff5f", "#ffff87", "#ffffaf", "#ffffd7", "#ffffff", "#080808", "#121212", "#1c1c1c", "#262626", "#303030", "#3a3a3a", "#444444", "#4e4e4e", "#585858", "#626262", "#6c6c6c", "#767676", "#808080", "#8a8a8a", "#949494", "#9e9e9e", "#a8a8a8", "#b2b2b2", "#bcbcbc", "#c6c6c6", "#d0d0d0", "#dadada", "#e4e4e4", "#eeeeee"])

color2ansi(c::Colorant) = indmin(colordiff.([c], hexcodes)) + 15
color2ansi(c::Union{AbstractString, Symbol}) = color2ansi(parse(Colorant, c))

end