Update format and add merlin to nix-shell

day1.ml

@@ -47,11 +47,7 @@ let rec get_2020_triple l =
 
 
 let test_input = [1721; 979; 366; 299; 675; 1456;]
-let () =
-      assert ((get_2020_pair test_input) = 514579)
-let () =
-      print_endline (string_of_int (get_2020_pair input_day1))
-let () =
-      assert ((get_2020_triple test_input) = 241861950)
-let () =
-      print_endline (string_of_int (get_2020_triple input_day1))
+let () = assert ((get_2020_pair test_input) = 514579)
+let () = print_endline (string_of_int (get_2020_pair input_day1))
+let () = assert ((get_2020_triple test_input) = 241861950)
+let () = print_endline (string_of_int (get_2020_triple input_day1))

day4.ml

@@ -23,18 +23,18 @@ type passport =
     }
 
 let passport_of_string s =
-    let map = String.split_on_char ' ' s
+    let hmap = String.split_on_char ' ' s
         |> List.map (String.split_on_char ':')
-        |> List.map (fun [k; v] -> (k, v)) in
+        |> List.filter_map (fun el -> match el with [k; v] -> Some (k, v) | _ -> None) in
     try Some
-        { byr = int_of_string (List.assoc "byr" map)
-        ; iyr = int_of_string (List.assoc "iyr" map)
-        ; eyr = int_of_string (List.assoc "eyr" map)
-        ; hgt = List.assoc "hgt" map
-        ; hcl = List.assoc "hcl" map
-        ; ecl = List.assoc "ecl" map
-        ; pid = List.assoc "pid" map
-        ; cid = List.assoc_opt "cid" map
+        { byr = int_of_string (List.assoc "byr" hmap)
+        ; iyr = int_of_string (List.assoc "iyr" hmap)
+        ; eyr = int_of_string (List.assoc "eyr" hmap)
+        ; hgt = List.assoc "hgt" hmap
+        ; hcl = List.assoc "hcl" hmap
+        ; ecl = List.assoc "ecl" hmap
+        ; pid = List.assoc "pid" hmap
+        ; cid = List.assoc_opt "cid" hmap
         }
     with Not_found -> None
 
@@ -68,7 +68,5 @@ let part2 l =
         |> List.length
 
 
-let () =
-        print_endline (string_of_int (read_file_rev filename |> part1))
-let () =
-        print_endline (string_of_int (read_file_rev filename |> part2))
+let () = print_endline (string_of_int (read_file_rev "day4.input" |> part1))
+let () = print_endline (string_of_int (read_file_rev "day4.input" |> part2))

day6.ml

@@ -24,16 +24,14 @@ let read_lines name =
 
 let part1 filename =
     read_lines filename
-    |> List.map (fun x -> x
-                          |> (String.concat "")
+    |> List.map (fun x -> x |> (String.concat "")
                             |> set_of_string
                             |> CS.cardinal)
     |> List.fold_left (+) 0
 
 let part2 filename =
     read_lines filename
-    |> List.map (fun x -> x
-                          |> List.map set_of_string
+    |> List.map (fun x -> x |> List.map set_of_string
                             |> List.fold_left CS.inter all_char_set
                             |> CS.cardinal)
     |> List.fold_left (+) 0

day8.ml

@@ -48,7 +48,7 @@ let rec swap_from idx ins =
 let fix instructions =
     let rec aux idx ins instructions =
         try run ins
-        with e -> let (i, ins) = swap_from idx (Array.copy instructions) in
+        with _ -> let (i, ins) = swap_from idx (Array.copy instructions) in
                   aux i ins instructions
     in aux 0 (Array.copy instructions) instructions
 

default.nix

@@ -26,9 +26,13 @@ stdenv.mkDerivation rec {
       findlib
       utop
       dune
+      merlin
+      ocamlformat
+      opam
     ];
   shellHook = ''
     alias utop="utop -init ${ocamlInit}"
     alias ocaml="ocaml -init ${ocamlInit}"
+    export MERLIN_SITE_VIM="${ocamlPackages.merlin}/share/merlin/vim"
   '';
 }