m3tk/src/dep/M3DepGenFinder.m3

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MODULE M3DepGenFinder;
IMPORT File, Rd, Process, FS, FileRd, OSError, RdExtras, ASCII;

IMPORT M3Extension;
IMPORT M3DepFindFile;

 For FATAL 

IMPORT Thread;
<*FATAL Rd.EndOfFile, Thread.Alerted*>

PROCEDURE New(overrides := FALSE): M3DepFindFile.T=
  <*FATAL OSError.E*>
  VAR rd: Rd.T; stdout: File.T;
      ix := 1;
      result: M3DepFindFile.T := NIL;
  CONST
    Arg2 = ARRAY OF TEXT{"srcmap", "-O"};
  BEGIN
    IF overrides THEN
      ix := 2;
    END;
    stdout := FS.OpenFile(".M3SRCMAP");
    TRY
      IF NOT RunProcess("m3build", SUBARRAY(Arg2, 0, ix),
                        xstdout := stdout) THEN RETURN NIL END;
    FINALLY
      stdout.close()
    END;

    TRY
      TRY
        rd := FileRd.Open(".M3SRCMAP");
        (* skip noise output by m3build *)
        EVAL RdExtras.GetText(rd, terminate := ASCII.Set{'@'});
        result :=
          NEW(M3DepFindFile.T).init(M3Extension.All, rd, NIL);
      FINALLY
        Rd.Close(rd);
      END;
    EXCEPT
    | Rd.Failure =>
    END;
    RETURN result;
  END New;

PROCEDURE RunProcess(cmd: TEXT; READONLY args: ARRAY OF TEXT;
                     xstdin, xstdout, xstderr: File.T := NIL): BOOLEAN=
  VAR stdin, stdout, stderr: File.T;
      p: Process.T;
  BEGIN
    Process.GetStandardFileHandles(stdin, stdout, stderr);
    IF xstdin # NIL THEN stdin := xstdin END;
    IF xstdout # NIL THEN stdout := xstdout END;
    IF xstderr # NIL THEN stderr := xstderr END;
    TRY
      p := Process.Create(cmd, args, NIL, NIL,
                     stdin, stdout, stderr);
      IF Process.Wait(p) # 0 THEN END;
    EXCEPT
    | OSError.E =>
        RETURN FALSE
    END;
    RETURN TRUE;
  END RunProcess;

BEGIN
END M3DepGenFinder.