feat: configurable brightness of the Day style

lua/tokyonight/colors.lua

@@ -48,6 +48,7 @@ function M.setup(config)
     colors.bg = "#1a1b26"
   end
   util.bg = colors.bg
+  util.day_brightness = config.dayBrightness
 
   colors.diff = {
     add = util.darken(colors.green2, 0.15),

lua/tokyonight/config.lua

@@ -17,6 +17,7 @@ end
 
 config = {
   style = opt("style", "storm"),
+  dayBrightness = opt("day_brightness", 0.3),
   transparent = opt("transparent", false),
   commentStyle = opt("italic_comments", true) and "italic" or "NONE",
   keywordStyle = opt("italic_keywords", true) and "italic" or "NONE",

lua/tokyonight/util.lua

@@ -7,6 +7,7 @@ util.colorCache = {}
 
 util.bg = "#000000"
 util.fg = "#ffffff"
+util.day_brightness = 0.3
 
 local function hexToRgb(hex_str)
   local hex = "[abcdef0-9][abcdef0-9]"
@@ -56,7 +57,7 @@ function util.invertColor(color)
     local hsl = hsluv.hex_to_hsluv(color)
     hsl[3] = 100 - hsl[3]
     if hsl[3] < 40 then
-      hsl[3] = hsl[3] + (100 - hsl[3]) * 0.3
+      hsl[3] = hsl[3] + (100 - hsl[3]) * util.day_brightness
     end
     return hsluv.hsluv_to_hex(hsl)
   end