myocamlbuild_config.ml

   1 (**
   2   This ocamlbuild plugin will try to find libraries by name using (in order)
   3   - local myocamlbuild.config file
   4   - ocamlfind
   5
   6   Sample myocamlbuild.config :
   7
   8 extlib=C:/my/contrib/extlib-1.5.1
   9 deriving=C:/my/contrib/deriving-0.1.1/lib
  10 oUnit=C:/my/contrib/ounit-1.0.3
  11
  12 *)
  13
  14 (** querying ocamlfind *)
  15
  16 let chomp s =
  17   let is_nl ch = match ch with | '\n' | '\r' -> true | _ -> false in
  18   let rec cut n =
  19     if n = 0 then 0 else if is_nl s.[n-1] then cut (n-1) else n
  20   in
  21   let ls = String.length s in
  22   let n = cut ls in
  23   if n = ls then s else String.sub s 0 n
  24
  25 let ocamlfind lib =
  26   let cin = Unix.open_process_in (Printf.sprintf "ocamlfind -query %s" lib) in
  27   let s = chomp (input_line cin) in
  28   (*  let s = Filename.quote s in*)
  29   ignore (Unix.close_process_in cin);
  30   s
  31
  32 (** querying config *)
  33
  34 let file_lines name =
  35   let l = ref [] in
  36   begin try
  37     let ch = open_in name in
  38     begin try while true do l := input_line ch :: !l done with End_of_file -> () end;
  39     close_in_noerr ch
  40   with
  41     exn -> ()
  42   end;
  43   !l
  44
  45 let read_config name =
  46   let l = file_lines name in
  47   let split s =
  48     let index = String.index s '=' in
  49     (String.sub s 0 index, String.sub s (index+1) ((String.length s) - index - 1))
  50   in
  51   let split s = try split s with _ -> "","" in
  52   List.map split l
  53
  54 (** usage *)
  55
  56 let config = read_config "myocamlbuild.config"
  57 let () =
  58   match config with
  59   | [] -> prerr_endline "No config, will use ocamlfind"
  60   | _ -> prerr_endline "Using config : ";
  61          List.iter (fun (x,y) -> Printf.eprintf "%s=%s\n%!" x y) config
  62
  63 let lib name =
  64   try
  65     List.assoc name config
  66   with exn ->
  67     try
  68       ocamlfind name
  69     with exn ->
  70       "+" ^ name
  71