add CCString.{lines,unlines} that work on lines

src/core/CCString.cppo.ml

@@ -263,7 +263,9 @@ let of_array a =
 let to_array s =
   Array.init (String.length s) (fun i -> s.[i])
 
-let lines s = Split.gen_cpy ~by:"\n" s
+let lines_gen s = Split.gen_cpy ~by:"\n" s
+
+let lines s = Split.list_cpy ~by:"\n" s
 
 let concat_gen ~sep g =
   let b = Buffer.create 256 in
@@ -275,7 +277,9 @@ let concat_gen ~sep g =
       aux ~first:false ()
   in aux ~first:true ()
 
-let unlines g = concat_gen ~sep:"\n" g
+let unlines l = String.concat "\n" l
+
+let unlines_gen g = concat_gen ~sep:"\n" g
 
 let pp buf s =
   Buffer.add_char buf '"';

src/core/CCString.mli

@@ -113,16 +113,24 @@ val suffix : suf:string -> string -> bool
   not (suffix ~suf:"abcd" "cd")
 *)
 
-val lines : string -> string gen
-(** [lines s] returns a generator of the lines of [s] (splits along '\n')
+val lines : string -> string list
+(** [lines s] returns a list of the lines of [s] (splits along '\n')
+    @since NEXT_RELEASE *)
+
+val lines_gen : string -> string gen
+(** [lines_gen s] returns a generator of the lines of [s] (splits along '\n')
     @since NEXT_RELEASE *)
 
 val concat_gen : sep:string -> string gen -> string
 (** [concat_gen ~sep g] concatenates all strings of [g], separated with [sep].
     @since NEXT_RELEASE *)
 
-val unlines : string gen -> string
-(** [unlines g] concatenates all strings of [g], separated with '\n'
+val unlines : string list -> string
+(** [unlines l] concatenates all strings of [l], separated with '\n'
+    @since NEXT_RELEASE *)
+
+val unlines_gen : string gen -> string
+(** [unlines_gen g] concatenates all strings of [g], separated with '\n'
     @since NEXT_RELEASE *)
 
 (*$Q