;; search did-you-mean / spelling suggestion — Haskell source fragment.
;; Depends on fuzzy (editDist) + index (allTerms). Ranks indexed terms by edit
;; distance to a (possibly misspelled) query term; ties broken alphabetically.
;;   suggestN :: Int -> String -> Index -> [Term]
;;   suggest  :: String -> Index -> Term   ("" if the index has no terms)

(define
  search/suggest-src
  "sgMk term t = (editDist term t, t)\nsgPairs term idx = map (sgMk term) (allTerms idx)\nsgCmp p1 p2 = if fst p1 < fst p2 then LT else if fst p1 > fst p2 then GT else compare (snd p1) (snd p2)\nsuggestN n term idx = take n (map snd (sortBy sgCmp (sgPairs term idx)))\nsgHead [] = \"\"\nsgHead (x:xs) = x\nsuggest term idx = sgHead (suggestN 1 term idx)\n")