Use floating window for completion menus (#224)

* WIP

* WIP

* Fix #226

* Insert text

* Emulate vim native

* テキトウ

* Tekito

* Move scrollbar impl

* aaa

* Ignore unexpected event

* fix

* fix scroll

* Refactor (conflict...)

* Fix bug

* Positive integer

* Refactor a bit

* Fix for pumheight=0

* fx

* Improve matching highlight

* Improve colorscheme handling

* fmt

* Add cmp.visible

* Fix pum pos

* ABBR_MARGIN

* Fix cel calculation

* up

* refactor

* fix

* a

* a

* compat

* Remove current completion state

* Fix ghost text

* Add feature toggle

* highlight customization

* Update

* Add breaking change announcement

* Add README.md

* Remove unused function

* extmark ephemeral ghost text

* Support native comp

* Fix docs  pos

* a

* Remove if native menu visible

* theme async

* Improvement idea: option to disables insert on select item (#240)

* use ghost text instead of insertion on prev/next item

* add disables_insert_on_selection option

* move disable_insert_on_select option as argumet on

* update README

* use an enum behavior to disable insert on select

* Adopt contribution

* Preselect

* Improve

* Change configuration option

* a

* Improve

* Improve

* Implement proper <C-e> behavior to native/custom

* Support <C-c> maybe

* Improve docs view

* Improve

* Avoid syntax leak

* TODO: refactor

* Fix

* Revert win pos

* fmt

* ghost text remaining

* Don't use italic by default

* bottom

* dedup by label

* Ignore events

* up

* Hacky native view partial support

* up

* perf

* improve

* more cache

* fmt

* Fix format option

* fmt

* recheck

* Fix

* Improve

* Improve

* compat

* implement redraw

* improve

* up

* fmt/lint

* immediate ghost text

* source timeout

* up

* Support multibyte

* disable highlight

* up

* improve

* fmt

* fmt

* fix

* fix

* up

* up

* Use screenpos

* Add undojoin check

* Fix height

* matcher bug

* Fix dot-repeat

* Remove undojoin

* macro

* Support dot-repeat

* MacroSafe

* Default item count is 200

* fmt

Co-authored-by: Eric Puentes <eric.puentes@mercadolibre.com.co>

lua/cmp/utils/highlight.lua

@@ -0,0 +1,46 @@
+local highlight = {}
+
+highlight.keys = {
+  'gui',
+  'guifg',
+  'guibg',
+  'cterm',
+  'ctermfg',
+  'ctermbg',
+}
+
+highlight.inherit = function(name, source, override)
+  local cmd = ('highlight! default %s'):format(name)
+  for _, key in ipairs(highlight.keys) do
+    if override[key] then
+      cmd = cmd .. (' %s=%s'):format(key, override[key])
+    else
+      local v = highlight.get(source, key)
+      v = v == '' and 'NONE' or v
+      cmd = cmd .. (' %s=%s'):format(key, v)
+    end
+  end
+  vim.cmd(cmd)
+end
+
+highlight.get = function(source, key)
+  if key == 'gui' or key == 'cterm' then
+    local ui = {}
+    for _, k in ipairs({ 'bold', 'italic', 'reverse', 'inverse', 'standout', 'underline', 'undercurl', 'strikethrough' }) do
+      if vim.fn.synIDattr(vim.fn.hlID(source), k, key) == 1 then
+        table.insert(ui, k)
+      end
+    end
+    return table.concat(ui, ',')
+  elseif key == 'guifg' then
+    return vim.fn.synIDattr(vim.fn.hlID(source), 'fg#', 'gui')
+  elseif key == 'guibg' then
+    return vim.fn.synIDattr(vim.fn.hlID(source), 'bg#', 'gui')
+  elseif key == 'ctermfg' then
+    return vim.fn.synIDattr(vim.fn.hlID(source), 'fg', 'term')
+  elseif key == 'ctermbg' then
+    return vim.fn.synIDattr(vim.fn.hlID(source), 'bg', 'term')
+  end
+end
+
+return highlight