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--- @class Util
local M = {}
function M.get_hl(name)
local ok, hl = pcall(vim.api.nvim_get_hl_by_name, name, true)
if not ok then
return
end
for _, key in pairs({ "foreground", "background", "special" }) do
if hl[key] then
hl[key] = string.format("#%06x", hl[key])
end
end
return hl
end
local function rgb_to_linear(c)
c = c / 255
return c <= 0.04045 and c / 12.92 or ((c + 0.055) / 1.055) ^ 2.4
end
local function relative_luminance(color)
return 0.2126 * color.r + 0.7152 * color.g + 0.0722 * color.b
end
function M.hex2linear_srgb(hex)
hex = hex:gsub("#", "")
return {
r = rgb_to_linear(tonumber("0x" .. hex:sub(1, 2))),
g = rgb_to_linear(tonumber("0x" .. hex:sub(3, 4))),
b = rgb_to_linear(tonumber("0x" .. hex:sub(5, 6))),
}
end
function M.contrast_ratio(c1, c2)
local lum1 = relative_luminance(c1)
local lum2 = relative_luminance(c2)
if lum1 < lum2 then
lum1, lum2 = lum2, lum1
end
return (lum1 + 0.05) / (lum2 + 0.05)
end
function M.maximize_contrast(base, fg1, fg2)
base = M.hex2linear_srgb(base)
return M.contrast_ratio(base, M.hex2linear_srgb(fg1)) > M.contrast_ratio(base, M.hex2linear_srgb(fg2)) and fg1 or fg2
end
function M.warn(msg)
vim.notify(msg, vim.log.levels.WARN, { title = "TodoComments" })
end
function M.error(msg)
vim.notify(msg, vim.log.levels.ERROR, { title = "TodoComments" })
end
return M
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