(* Title: Pure/ML-Systems/polyml.ML
ID: $Id$
Author: Lawrence C Paulson, Cambridge University Computer Laboratory
Copyright 1991 University of Cambridge
Compatibility file for Poly/ML (versions 2.x and 3.x).
*)
open PolyML ExtendedIO;
(*needs the Basis Library emulation*)
use "basis.ML";
(** ML system related **)
(** Compiler-independent timing functions **)
(*Note start point for timing*)
fun startTiming() = System.processtime ();
(*Finish timing and return string*)
fun endTiming before =
"User + GC: " ^
makestring (real (System.processtime () - before) / 10.0) ^
" secs";
(* prompts *)
fun ml_prompts p1 p2 = (PolyML.Compiler.prompt1 := p1; PolyML.Compiler.prompt1 := p2);
(* toplevel pretty printing (see also Pure/install_pp.ML) *)
fun make_pp _ pprint (str, blk, brk, en) obj =
pprint obj (str, fn ind => blk (ind, false), fn wd => brk (wd, 0),
fn () => brk (99999, 0), en);
(* ML command execution -- 'eval' *)
val use_strings =
let
fun exec line =
let
val is_first = ref true;
fun get_line () =
if ! is_first then (is_first := false; line)
else raise Io "use_strings: buffer exhausted";
in
PolyML.compiler (get_line, print) ()
end;
fun execs [] = ()
| execs (line :: lines) = (exec line; execs lines);
in execs end;
(** OS related **)
local
fun drop_last [] = []
| drop_last [x] = []
| drop_last (x :: xs) = x :: drop_last xs;
val drop_last_char = implode o drop_last o explode;
in
(* system command execution *)
(*execute Unix command which doesn't take any input from stdin and
sends its output to stdout*)
fun execute command =
let
val (is, os) = ExtendedIO.execute command;
val result = input (is, 999999);
in
close_out os;
close_in is;
result
end;
(* file handling *)
(*get time of last modification; if file doesn't exist return an empty string*)
fun file_info "" = "" (* FIXME !? *)
| file_info name = Int.toString (System.filedate name) handle _ => "";
structure OS =
struct
structure FileSys =
struct
val chDir = PolyML.cd;
fun remove name = (execute ("rm " ^ name); ());
fun getDir () = drop_last_char (execute "pwd");
end;
end;
(* getenv *)
fun getenv var = drop_last_char
(execute ("env | grep '^" ^ var ^ "=' | sed -e 's/" ^ var ^ "=//'"));
end;
(* non-ASCII input (see also Thy/use.ML) *)
val needs_filtered_use =
(case explode ml_system of
"p" :: "o" :: "l" :: "y" :: "m" :: "l" :: "-" :: "3" :: _ => true
| _ => false);