add sorter (not working yet)

lua/telescope/_extensions/frecency/sorter.lua

@@ -0,0 +1,29 @@
+local sorters = require "telescope.sorters"
+
+local my_sorters = {}
+
+my_sorters.get_frecency_sorter = function(opts)
+  opts = opts or {}
+  opts.ngram_len = 2
+
+  local fuzzy_sorter = sorters.get_generic_fuzzy_sorter(opts)
+
+  local frecency = sorters:new()
+  frecency.scoring_function = function(_, prompt, _, entry)
+    local base_score = fuzzy_sorter:score(prompt, entry)
+
+    if base_score == -1 then
+      return -1
+    end
+
+    if base_score == 0 then
+      return entry.index
+    else
+      return math.min(math.pow(entry.index, 0.25), 2) * base_score
+    end
+  end
+
+  return frecency
+end
+
+return my_sorters