math/render.ml

   1 let cmd_dvips tmpprefix = "dvips -R -E " ^ tmpprefix ^ ".dvi -f >" ^ tmpprefix ^ ".ps"
   2 let cmd_latex tmpprefix = "latex " ^ tmpprefix ^ ".tex >/dev/null"
   3 let cmd_convert tmpprefix finalpath = "convert -quality 100 -density 120 " ^ tmpprefix ^ ".ps " ^ finalpath ^ " >/dev/null 2>/dev/null"
   4
   5 exception ExternalCommandFailure of string
   6
   7 let render tmppath finalpath outtex md5 =
   8     let tmpprefix0 = (string_of_int (Unix.getpid ()))^"_"^md5 in
   9     let tmpprefix = (tmppath^"/"^tmpprefix0) in
  10     let unlink_all () =
  11       begin
  12         Sys.remove (tmpprefix ^ ".dvi");
  13         Sys.remove (tmpprefix ^ ".aux");
  14         Sys.remove (tmpprefix ^ ".log");
  15         Sys.remove (tmpprefix ^ ".tex");
  16         Sys.remove (tmpprefix ^ ".ps");
  17       end in
  18     let f = (Util.open_out_unless_exists (tmpprefix ^ ".tex")) in
  19       begin
  20         output_string f (Texutil.get_preface ());
  21         output_string f outtex;
  22         output_string f (Texutil.get_footer ());
  23         close_out f;
  24         if Util.run_in_other_directory tmppath (cmd_latex tmpprefix0) != 0
  25         then (unlink_all (); raise (ExternalCommandFailure "latex"))
  26         else if (Sys.command (cmd_dvips tmpprefix) != 0)
  27         then (unlink_all (); raise (ExternalCommandFailure "dvips"))
  28         else if (Sys.command (cmd_convert tmpprefix (finalpath^"/"^md5^".png")) != 0)
  29         then (unlink_all (); raise (ExternalCommandFailure "convert"))
  30         else unlink_all ()
  31       end