highlights for cmp and label cmp plugins

lua/core/highlight.lua

@@ -1,12 +1,19 @@
 local highlight = function(group, opts, space)
   space = space or 0
-  a.nvim_set_hl(space, group, opts)
+
+  if type(group) == 'table' then
+    for i in pairs(group) do
+      a.nvim_set_hl(space, group[i], opts)
+    end
+  elseif type(group) == 'string' then
+    a.nvim_set_hl(space, group, opts)
+  end
 end
 
 local c = require('mellow.colors').dark
 
 -- vim highlights -------------------------------------------------------------
-highlight("CursorLineNr", { bg = c.bg_dark, fg = c.fg,  bold = true })
+highlight('CursorLineNr', { bg = c.bg_dark, fg = c.fg,  bold = true })
 
 -- remove tildas
 highlight('EndOfBuffer', { fg = c.bg })
@@ -44,3 +51,29 @@ highlight('FidgetTask', { fg = c.fg })
 
 -- quick fix sign
 highlight('LightBulbSignTxthl', {fg = c.bright_magenta})
+
+-- completion highlights
+highlight('CmpItemAbbrDeprecated',    { fg = c.gray06, strikethrough = true })
+highlight('CmpItemAbbrMatch',         { fg = c.yellow, bold = true })
+highlight('CmpItemAbbrMatchFuzzy',    { fg = c.yellow, bold = true })
+highlight('CmpItemMenu',              { fg = c.magenta, italic = true })
+
+highlight({ 'CmpItemKindField', 'CmpItemKindProperty', 'CmpItemKindEvent' },
+  { fg = '#EED8DA', bg = '#B5585F' })
+highlight({ 'CmpItemKindText', 'CmpItemKindEnum', 'CmpItemKindKeyword' },
+  { fg = '#C3E88D', bg = '#9FBD73' })
+highlight({ 'CmpItemKindConstant', 'CmpItemKindConstructor',
+  'CmpItemKindReference' },
+  { fg = '#FFE082', bg = '#D4BB6C' })
+highlight({ 'CmpItemKindFunction', 'CmpItemKindStruct', 'CmpItemKindClass',
+  'CmpItemKindModule', 'CmpItemKindOperator', },
+  { fg = '#EADFF0', bg = '#A377BF', })
+highlight({ 'CmpItemKindVariable', 'CmpItemKindFile' },
+  { fg = '#C5CDD9', bg = '#7E8294' })
+highlight({ 'CmpItemKindUnit', 'CmpItemKindSnippet', 'CmpItemKindFolder' },
+  { fg = '#F5EBD9', bg = '#D4A959' })
+highlight({ 'CmpItemKindMethod', 'CmpItemKindValue', 'CmpItemKindEnumMember' },
+  { fg = '#DDE5F5', bg = '#6C8ED4' })
+highlight({ 'CmpItemKindInterface', 'CmpItemKindColor',
+  'CmpItemKindTypeParameter' },
+  { fg = '#D8EEEB', bg = '#58B5A8' })