support multiple search terms

lua/telescope/_extensions/frecency/sorter.lua

@@ -2,16 +2,27 @@ local sorters = require "telescope.sorters"
 
 local my_sorters = {}
 
+local function split(s, delimiter)
+  local result = {}
+  for match in (s .. delimiter):gmatch("(.-)" .. delimiter) do
+    table.insert(result, match)
+  end
+  return result
+end
 
 local substr_highlighter = function(_, prompt, display)
   local highlights = {}
   display = display:lower()
 
+  local search_terms = split(prompt, " ")
   local hl_start, hl_end
-  hl_start, hl_end = display:find(prompt, 1, true)
+
+  for _, word in pairs(search_terms) do
+    hl_start, hl_end = display:find(word, 1, true)
     if hl_start then
       table.insert(highlights, {start = hl_start, finish = hl_end})
     end
+  end
 
   return highlights
 end
@@ -22,19 +33,19 @@ my_sorters.get_substr_matcher = function(opts)
   local substr = sorters:new()
   substr.highlighter = substr_highlighter
   substr.scoring_function = function(_, prompt, _, entry)
-    -- local base_score = frecency:score(prompt, entry)
     local display = entry.name:lower()
-    local base_score
 
-    -- TODO: split the prompt into components
-    base_score = display:find(prompt, 1, true) and 1 or -1
-
-    if base_score == -1 then
-      return -1
+    local search_terms = split(prompt, " ")
+    local matched
+    for _, word in pairs(search_terms) do
+       matched = display:find(word, 1, true) and 1 or -1
+       if matched == -1 then goto continue end
     end
 
-    if base_score == 0 then
-      return entry.index
+    ::continue::
+
+    if matched == -1 then
+      return -1
     else
       return entry.index
     end