math/render.ml

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