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refactor: generate icons from their glyph names
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Original file line number | Diff line number | Diff line change |
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@@ -1,3 +1,4 @@ | ||
.lua | ||
.luarocks | ||
/nerd-fonts/ | ||
/vim-colortemplate/ |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,44 @@ | ||
local M = {} | ||
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---@param rrggbb string | ||
---@return string | ||
function M.darken(rrggbb) | ||
local light78 = 255 * 7 / 8 | ||
local light68 = 255 * 6 / 8 | ||
local light58 = 255 * 5 / 8 | ||
local light12 = 255 / 2 | ||
local light13 = 255 / 3 | ||
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local hex = bit.tohex ---@type fun(n: number): string | ||
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local r, g, b = rrggbb:match "%#(%x%x)(%x%x)(%x%x)" | ||
r, g, b = tonumber("0x" .. r), tonumber("0x" .. g), tonumber("0x" .. b) | ||
-- luminance formula: see https://stackoverflow.com/a/596243 | ||
local lum = 0.299 * r + 0.587 * g + 0.114 * b | ||
if lum < light13 then -------------------- darkest tertile | ||
return rrggbb | ||
elseif lum < light12 then ---------------- second darkest quartile | ||
r = hex(r / 4 * 3):sub(-2) | ||
g = hex(g / 4 * 3):sub(-2) | ||
b = hex(b / 4 * 3):sub(-2) | ||
elseif lum < light58 then ---------------- lightest octiles: first | ||
r = hex(r / 3 * 2):sub(-2) | ||
g = hex(g / 3 * 2):sub(-2) | ||
b = hex(b / 3 * 2):sub(-2) | ||
elseif lum < light68 then ---------------- lightest octiles: second | ||
r = hex(r / 2):sub(-2) | ||
g = hex(g / 2):sub(-2) | ||
b = hex(b / 2):sub(-2) | ||
elseif lum < light78 then ---------------- lightest octiles: third | ||
r = hex(r / 3):sub(-2) | ||
g = hex(g / 3):sub(-2) | ||
b = hex(b / 3):sub(-2) | ||
else ------------------------------------- lightest octile | ||
r = hex(r / 5):sub(-2) | ||
g = hex(g / 5):sub(-2) | ||
b = hex(b / 5):sub(-2) | ||
end | ||
return string.format("#%s%s%s", r, g, b) | ||
end | ||
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return M |
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