fix: dim would not get applied when lazy loading plugin (#27)

lua/auto-save/utils/colors.lua

@@ -1,4 +1,15 @@
+--- This file is deprecated and should be removed in the future.
+--- It is still in use but the functionality does not belong in the scope of this plugin
+
+local o = vim.o
+local api = vim.api
+
+local BLACK = "#000000"
+local WHITE = "#ffffff"
+local auto_save_hl_group = "MsgArea"
+
 local M = {}
+
 ---@param hex_str string hexadecimal value of a color
 local hex_to_rgb = function(hex_str)
   local hex = "[abcdef0-9][abcdef0-9]"
@@ -11,7 +22,10 @@ local hex_to_rgb = function(hex_str)
   return { tonumber(red, 16), tonumber(green, 16), tonumber(blue, 16) }
 end
 
-function M.highlight(group, color, force)
+--- @param group string
+--- @param color table
+--- @param force? boolean
+local function highlight(group, color, force)
   if color.link then
     vim.api.nvim_set_hl(0, group, {
       link = color.link,
@@ -31,7 +45,7 @@ function M.highlight(group, color, force)
   end
 end
 
-function M.get_hl(name)
+local function get_hl(name)
   local ok, hl = pcall(vim.api.nvim_get_hl_by_name, name, true)
   if not ok then
     return
@@ -44,27 +58,46 @@ function M.get_hl(name)
   return hl
 end
 
----@param fg string forecrust color
+---@param fg string foreground color
 ---@param bg string background color
 ---@param alpha number number between 0 and 1. 0 results in bg, 1 results in fg
-function M.blend(fg, bg, alpha)
-  bg = hex_to_rgb(bg)
-  fg = hex_to_rgb(fg)
+local function blend(fg, bg, alpha)
+  local bg_hex = hex_to_rgb(bg)
+  local fg_hex = hex_to_rgb(fg)
 
   local blendChannel = function(i)
-    local ret = (alpha * fg[i] + ((1 - alpha) * bg[i]))
+    local ret = (alpha * fg_hex[i] + ((1 - alpha) * bg_hex[i]))
     return math.floor(math.min(math.max(0, ret), 255) + 0.5)
   end
 
   return string.format("#%02X%02X%02X", blendChannel(1), blendChannel(2), blendChannel(3))
 end
 
-function M.darken(hex, amount, bg)
-  return M.blend(hex, bg or M.bg, math.abs(amount))
+--- This function is still in use, but should be removed in the future.
+--- The dimming should be done by the colorscheme or an UI Plugin.
+--- @deprecated
+--- @param dim_value number
+M.apply_colors = function(dim_value)
+  if dim_value > 0 then
+    MSG_AREA = get_hl("MsgArea")
+    if MSG_AREA.foreground ~= nil then
+      MSG_AREA.background = (MSG_AREA.background or get_hl("Normal")["background"])
+      local foreground = (
+        o.background == "dark" and blend(MSG_AREA.background or BLACK, MSG_AREA.foreground or BLACK, dim_value)
+        or blend(MSG_AREA.background or WHITE, MSG_AREA.foreground or WHITE, dim_value)
+      )
+
+      highlight("AutoSaveText", { fg = foreground })
+      auto_save_hl_group = "AutoSaveText"
+    end
+  end
 end
 
-function M.lighten(hex, amount, fg)
-  return M.blend(hex, fg or M.fg, math.abs(amount))
+--- @deprecated
+--- @see M.apply_colors
+--- @param message string
+M.echo_with_highlight = function(message)
+  api.nvim_echo({ { message, auto_save_hl_group } }, true, {})
 end
 
 return M