add option for overriding highlights (#596)

lua/core/utils.lua

@@ -1,5 +1,6 @@
 local M = {}
 
+local cmd = vim.cmd
 M.close_buffer = function(bufexpr, force)
    -- This is a modification of a NeoVim plugin from
    -- Author: ojroques - Olivier Roques
@@ -330,4 +331,29 @@ M.packer_lazy_load = function(plugin, timer)
    end
 end
 
+-- Highlights functions
+
+-- Define bg color
+-- @param group Group
+-- @param color Color
+
+M.bg = function(group, col)
+   cmd("hi " .. group .. " guibg=" .. col)
+end
+
+-- Define fg color
+-- @param group Group
+-- @param color Color
+M.fg = function(group, col)
+   cmd("hi " .. group .. " guifg=" .. col)
+end
+
+-- Define bg and fg color
+-- @param group Group
+-- @param fgcol Fg Color
+-- @param bgcol Bg Color
+M.fg_bg = function(group, fgcol, bgcol)
+   cmd("hi " .. group .. " guifg=" .. fgcol .. " guibg=" .. bgcol)
+end
+
 return M