fix(bufferline): Add configuration for bufferline tab (#117)

- Add higlight for bufferline tab
- Fix the issue when transparent background is enabled

lua/monokai-pro/color_helper.lua

@@ -1,7 +1,7 @@
 ---@class Helper
 local M = {}
 
----@param background? HexColor
+---@param background? HexColor | "NONE"
 local function get_blend_background(background)
   if background ~= nil and background ~= "NONE" then
     return background
@@ -33,9 +33,12 @@ local function rgb_to_hex(rgb)
   return "#" .. red .. green .. blue
 end
 
----@param hex HexColor
+---@param hex HexColor | "NONE"
 ---@param amt number
 M.lighten = function(hex, amt)
+  -- stylua: ignore
+  if hex == "NONE" then return hex end
+
   local rgb = hex_to_rgb(hex)
   -- over upper
   rgb.r = (rgb.r + amt > 255) and 255 or (rgb.r + amt)
@@ -64,12 +67,15 @@ M.rgba = function(red, green, blue, alpha, background)
   return rgb_to_hex({ r = red, g = green, b = blue })
 end
 
----@param hexColor HexColor
+---@param hex HexColor | "NONE"
 ---@param alpha HexColorAlpha
 ---@param base? HexColor
-M.blend = function(hexColor, alpha, base)
+M.blend = function(hex, alpha, base)
+  -- stylua: ignore
+  if hex == "NONE" then return "NONE" end
+
   base = get_blend_background(base)
-  local rgb = hex_to_rgb(hexColor)
+  local rgb = hex_to_rgb(hex)
   return M.rgba(rgb.r, rgb.g, rgb.b, alpha, base)
 end
 

lua/monokai-pro/theme/plugins/bufferline.lua

@@ -58,6 +58,7 @@ function M.get(c, config, hp)
 
   local tabsBackground = isBackgroundClear and c.editor.background or c.editorGroupHeader.tabsBackground
   local amt = 10
+
   M.tab = vim.tbl_deep_extend("force", c.tab, isBackgroundClear and {
     activeBackground = hp.lighten(c.tab.activeBackground, amt),
     inactiveBackground = hp.lighten(c.tab.inactiveBackground, amt),
@@ -257,10 +258,29 @@ function M.get(c, config, hp)
       bg = M.tab.unfocusedActiveBackground,
       fg = c.base.red,
     },
+    BufferLineTab = {
+      bg = M.tab.inactiveBackground,
+      fg = hp.blend(c.base.white, normalAlpha, M.tab.inactiveBackground),
+    },
     BufferLineTabClose = {
       bg = tabsBackground,
       fg = tabsBackground,
     },
+    BufferLineTabSelected = {
+      bg = M.tab.activeBackground,
+      fg = M.tab.activeForeground,
+    },
+    BufferLineTabSeparator = {
+      bg = M.tab.inactiveBackground,
+      fg = M.tab.inactiveBackground,
+      -- fg = tabsBackground,
+    },
+    BufferLineTabSeparatorSelected = {
+      bg = M.tab.activeBackground,
+      fg = M.tab.activeBackground,
+      -- fg = tabsBackground,
+    },
+
     -- indicator
     BufferLineIndicatorSelected = {
       bg = M.tab.activeBackground,