Add Completion Window Options (#901)

* Add window.completion.side_padding and window.completion.col_offset

* add col_offset and side_padding options to config/window

doc/cmp.txt

@@ -560,6 +560,16 @@ window.{completion,documentation}.zindex~
   The completion window's zindex.
   See |nvim_open_win|.
 
+                                       *cmp-config.window.completion.col_offset*
+window.completion.col_offset~
+  `number`
+  Offsets the completion window relative to the cursor.
+
+                                     *cmp-config.window.completion.side_padding*
+window.completion.side_padding~
+  `number`
+  The ammount of padding to add on the completion window's sides
+
                                      *cmp-config.window.documentation.max_width*
 window.documentation.max_width~
   `number`

lua/cmp/config/default.lua

@@ -90,6 +90,8 @@ return function()
       completion = {
         border = { '', '', '', '', '', '', '', '' },
         winhighlight = 'Normal:Pmenu,FloatBorder:Pmenu,CursorLine:PmenuSel,Search:None',
+        col_offset = 0,
+        side_padding = 1,
       },
       documentation = {
         max_height = math.floor(WIDE_HEIGHT * (WIDE_HEIGHT / vim.o.lines)),

lua/cmp/config/window.lua

@@ -6,6 +6,8 @@ window.bordered = function(opts)
     border = opts.border or 'rounded',
     winhighlight = opts.winhighlight or 'Normal:Normal,FloatBorder:Normal,CursorLine:Visual,Search:None',
     zindex = opts.zindex or 1001,
+    col_offset = opts.col_offset or 0,
+    side_padding = opts.side_padding or 1
   }
 end
 

lua/cmp/view/custom_entries_view.lua

@@ -8,8 +8,6 @@ local keymap = require('cmp.utils.keymap')
 local misc = require('cmp.utils.misc')
 local api = require('cmp.utils.api')
 
-local SIDE_PADDING = 1
-
 local DEFAULT_HEIGHT = 10 -- @see https://github.com/vim/vim/blob/master/src/popupmenu.c#L45
 
 ---@class cmp.CustomEntriesView
@@ -65,7 +63,7 @@ custom_entries_view.new = function()
         local e = self.entries[i + 1]
         if e then
           local v = e:get_view(self.offset, buf)
-          local o = SIDE_PADDING
+          local o = config.get().window.completion.side_padding
           local a = 0
           for _, field in ipairs(fields) do
             if field == types.cmp.ItemField.Abbr then
@@ -200,7 +198,7 @@ custom_entries_view.open = function(self, offset, entries)
     relative = 'editor',
     style = 'minimal',
     row = math.max(0, row),
-    col = math.max(0, col),
+    col = math.max(0, col + completion.col_offset),
     width = width,
     height = height,
     border = completion.border,
@@ -255,12 +253,12 @@ custom_entries_view.draw = function(self)
     if e then
       local view = e:get_view(self.offset, entries_buf)
       local text = {}
-      table.insert(text, string.rep(' ', SIDE_PADDING))
+      table.insert(text, string.rep(' ', config.get().window.completion.side_padding))
       for _, field in ipairs(fields) do
         table.insert(text, view[field].text)
         table.insert(text, string.rep(' ', 1 + self.column_width[field] - view[field].width))
       end
-      table.insert(text, string.rep(' ', SIDE_PADDING))
+      table.insert(text, string.rep(' ', config.get().window.completion.side_padding))
       table.insert(texts, table.concat(text, ''))
     end
   end