feat: add top down prompt position

lua/telescope/pickers/config_collapse.lua

@@ -0,0 +1,51 @@
+
+--[[
+
+Ultimately boils down to getting `height` and `width` for:
+- prompt
+- preview
+- results
+
+No matter what you do, I will not make prompt have more than one line (atm)
+
+Result of `resolve` should be a table with:
+
+{
+  preview = {
+    get_width = function(self, max_columns, max_lines) end
+    get_height = function(self, max_columns, max_lines) end
+  },
+
+  result = {
+    get_width = function(self, max_columns, max_lines) end
+    get_height = function(self, max_columns, max_lines) end
+  },
+
+  prompt = {
+    get_width = function(self, max_columns, max_lines) return 1end
+    get_height = function(self, max_columns, max_lines) end
+  },
+}
+
+--]]
+
+local resolver = {}
+
+local percentage_resolver = function(selector, percentage)
+  assert(percentage <= 1)
+  assert(percentage >= 0)
+
+  return function(...)
+    return percentage * select(selector, ...)
+  end
+end
+
+resolver.resolve_percentage_height = function(percentage)
+  return percentage_resolver(3, percentage)
+end
+
+resolver.resolve_percentage_width = function(percentage)
+  return percentage_resolver(2, percentage)
+end
+
+return resolver

lua/telescope/pickers/layout_strategies.lua

@@ -64,9 +64,18 @@ layout_strategies.horizontal = function(self, max_columns, max_lines, prompt_tit
 
   -- TODO: Center this in the page a bit better.
   local height_padding = math.max(math.floor(0.95 * max_lines), 2)
-  results.line = max_lines - height_padding
-  prompt.line = results.line + results.height + 2
-  preview.line = results.line
+
+  if self.window.prompt_position == "top" then
+    prompt.line = max_lines - height_padding
+    results.line = prompt.line + 3
+    preview.line = prompt.line
+  elseif self.window.prompt_position == "bottom" then
+    results.line = max_lines - height_padding
+    prompt.line = results.line + results.height + 2
+    preview.line = results.line
+  else
+    error("Unknown prompt_position: " .. self.window.prompt_position)
+  end
 
   return {
     preview = preview.width > 0 and preview,