feat!: spring cleaning

lua/rose-pine/utilities.lua

@@ -0,0 +1,66 @@
+local utilities = {}
+
+---@param color string
+local function color_to_rgb(color)
+	local function byte(value, offset)
+		return bit.band(bit.rshift(value, offset), 0xFF)
+	end
+
+	local new_color = vim.api.nvim_get_color_by_name(color)
+	if new_color == -1 then
+		new_color = vim.opt.background:get() == "dark" and 000 or 255255255
+	end
+
+	return { byte(new_color, 16), byte(new_color, 8), byte(new_color, 0) }
+end
+
+---@param color string Palette key or hex value
+local function parse_color(color)
+	if color == nil then
+		return print("Invalid color")
+	end
+
+	color = color:lower()
+
+	if not color:find("#") and color ~= "NONE" then
+		color = require("rose-pine.palette")[color] or vim.api.nvim_get_color_by_name(color)
+	end
+
+	return color
+end
+
+---@param fg string Foreground color
+---@param bg string Background color
+---@param alpha number Between 0 (background) and 1 (foreground)
+local function blend(fg, bg, alpha)
+	local fg_rgb = color_to_rgb(fg)
+	local bg_rgb = color_to_rgb(bg)
+
+	local function blend_channel(i)
+		local ret = (alpha * fg_rgb[i] + ((1 - alpha) * bg_rgb[i]))
+		return math.floor(math.min(math.max(0, ret), 255) + 0.5)
+	end
+
+	return string.format("#%02X%02X%02X", blend_channel(1), blend_channel(2), blend_channel(3))
+end
+
+---@param group string
+---@param highlight table<string, any>
+function utilities.highlight(group, highlight, blend_on)
+	local fg = highlight.fg and parse_color(highlight.fg) or "NONE"
+	local bg = highlight.bg and parse_color(highlight.bg) or "NONE"
+	local sp = highlight.sp and parse_color(highlight.sp) or "NONE"
+
+	if highlight.blend ~= nil and (highlight.blend >= 0 and highlight.blend <= 100) and bg ~= nil then
+		bg = blend(bg, blend_on or require("rose-pine.palette").base, highlight.blend / 100)
+	end
+
+	highlight.fg = fg
+	highlight.bg = bg
+	highlight.sp = sp
+	-- highlight = vim.tbl_extend("force", highlight, { fg = fg, bg = bg, sp = sp })
+
+	vim.api.nvim_set_hl(0, group, highlight)
+end
+
+return utilities