Refactor cursor layout code

lua/telescope/pickers/layout_strategies.lua

@@ -221,38 +221,53 @@ layout_strategies.cursor = function(self, columns, lines)
  local height = resolve.resolve_height(self.window.results_height)(self, columns, lines)
  local width = resolve.resolve_width(self.window.width)(self, columns, lines)
 
- --local max_results = (height > lines and lines or height)
  local max_width = (width > columns and columns or width)
 
  -- border size
  local bs = 1
  if is_borderless(self) then
  bs = 0
  end
- local edge_gap = 1
 
  prompt.height = 1
  results.height = height
- preview.height = height + 2
+ preview.height = results.height + prompt.height + bs
 
+ -- If previewer is activated, it should take 2/3 of the space (width)
  local width_left = self.previewer and math.floor(max_width/3) or max_width
  prompt.width = width_left
- results.width = width_left
+ results.width = prompt.width
  preview.width = self.previewer and (2*width_left) or 0
 
+ local total_height = preview.height + (bs*2)
+ local total_width = prompt.width + (bs*2) + preview.width + bs
+
  local position = vim.fn.nvim_win_get_position(0)
- local cursor_line = vim.fn.winline() + position[1]
- local cursor_col = vim.fn.wincol() + position[2]
+ local top_left = {
+ line = vim.fn.winline() + position[1] + bs,
+ col = vim.fn.wincol() + position[2]
+ }
+ local bot_right = {
+ line = top_left.line + total_height - 1,
+ col = top_left.col + total_width - 1
+ }
+
+ if bot_right.line > lines then
+ -- position above current line
+ top_left.line = top_left.line - total_height - 1
+ end
+ if bot_right.col >= columns then
+ -- cap to the right of the screen
+ top_left.col = columns - total_width
+ end
 
- local max_line = (cursor_line + (bs*3) + height + prompt.height) > lines and (cursor_line - (bs*3) - height - prompt.height - 1) or cursor_line
- prompt.line = max_line + bs
- results.line = prompt.line + (bs*2)
+ prompt.line = top_left.line
+ results.line = prompt.line + bs + 1
  preview.line = prompt.line
 
- local max_col = (cursor_col + max_width + bs + edge_gap) > columns and (columns - max_width - bs - edge_gap) or cursor_col
- prompt.col = max_col
- results.col = max_col
- preview.col = results.col + results.width + bs + bs
+ prompt.col = top_left.col
+ results.col = prompt.col
+ preview.col = results.col + (bs*2) + results.width
 
  return {
  preview = self.previewer and preview.width > 0 and preview,