Dynamic window flip

add support for all selection order

if top space is not enough, do not flip window

take border into consider

set every possible winconfig

see if it is multiline  for 'noselect'

lua/cmp/view.lua

@@ -25,11 +25,11 @@ view.new = function()
   local self = setmetatable({}, { __index = view })
   self.resolve_dedup = async.dedup()
   self.is_docs_view_pinned = false
-  self.custom_entries_view = custom_entries_view.new()
+  self.ghost_text_view = ghost_text_view.new()
+  self.custom_entries_view = custom_entries_view.new(ghost_text_view)
   self.native_entries_view = native_entries_view.new()
   self.wildmenu_entries_view = wildmenu_entries_view.new()
   self.docs_view = docs_view.new()
-  self.ghost_text_view = ghost_text_view.new()
   self.event = event.new()
 
   return self

lua/cmp/view/custom_entries_view.lua

@@ -12,6 +12,7 @@ local DEFAULT_HEIGHT = 10 -- @see https://github.com/vim/vim/blob/master/src/pop
 
 ---@class cmp.CustomEntriesView
 ---@field private entries_win cmp.Window
+---@field private ghost_text_view cmp.GhostTextView
 ---@field private offset integer
 ---@field private active boolean
 ---@field private entries cmp.Entry[]
@@ -21,7 +22,7 @@ local custom_entries_view = {}
 
 custom_entries_view.ns = vim.api.nvim_create_namespace('cmp.view.custom_entries_view')
 
-custom_entries_view.new = function()
+custom_entries_view.new = function(ghost_text_view)
   local self = setmetatable({}, { __index = custom_entries_view })
 
   self.entries_win = window.new()
@@ -43,6 +44,7 @@ custom_entries_view.new = function()
   self.active = false
   self.entries = {}
   self.bottom_up = false
+  self.ghost_text_view = ghost_text_view
 
   autocmd.subscribe(
     'CompleteChanged',
@@ -446,6 +448,48 @@ custom_entries_view._select = function(self, cursor, option)
     0,
   })
 
+  if not self.bottom_up then
+    -- This logic keeps the same as open()
+    local info = self.entries_win:info()
+    local border_info = info.border_info
+    local border_offset_row = border_info.top + border_info.bottom
+    local row = api.get_screen_cursor()[1]
+    local height = vim.api.nvim_get_option_value('pumheight', {})
+    height = height ~= 0 and height or #self.entries
+    height = math.min(height, #self.entries)
+
+    -- If user specify 'noselect', select first entry
+    local entry = self:get_selected_entry() or self:get_first_entry()
+    local should_move_up = self.ghost_text_view:has_multi_line(entry) and row > height + border_offset_row
+    if should_move_up then
+      self.bottom_up = true
+      height = math.min(height, row - 1)
+      row = row - height - border_offset_row - 1
+      local completion = config.get().window.completion
+      local new_position = {
+        style = 'minimal',
+        relative = 'editor',
+        row = math.max(0, row),
+        height = height,
+        col = info.col,
+        width = info.width,
+        border = completion.border,
+        zindex = completion.zindex or 1001,
+      }
+      self.entries_win:open(new_position)
+
+      if not self:is_direction_top_down() then
+        local n = #self.entries
+        for i = 1, math.floor(n / 2) do
+          self.entries[i], self.entries[n - i + 1] = self.entries[n - i + 1], self.entries[i]
+        end
+        self:_select(#self.entries - cursor + 1, option)
+      else
+        self:_select(cursor, option)
+      end
+    end
+  end
+
   if is_insert then
     self:_insert(self.entries[cursor] and self.entries[cursor]:get_vim_item(self.offset).word or self.prefix)
   end

lua/cmp/view/ghost_text_view.lua

@@ -157,4 +157,20 @@ ghost_text_view.hide = function(self)
   end
 end
 
+ghost_text_view.has_multi_line = function(self, e)
+  if not api.is_insert_mode() then
+    return false
+  end
+  local c = config.get().experimental.ghost_text
+  if not c then
+    return false
+  end
+
+  local _, col = unpack(vim.api.nvim_win_get_cursor(0))
+  local line = vim.api.nvim_get_current_line()
+
+  local virt_lines = self.text_gen(self, line, col, e)
+  return #virt_lines > 1
+end
+
 return ghost_text_view