59 lines
2.4 KiB
OCaml
59 lines
2.4 KiB
OCaml
(* vim: set sw=8 ts=8 et: *)
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let cmd_dvips tmpprefix = "dvips -q -R -E " ^ tmpprefix ^ ".dvi -f >" ^ tmpprefix ^ ".ps"
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let cmd_latex tmpprefix = "latex " ^ tmpprefix ^ ".tex >/dev/null"
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(* Putting -transparent white in converts arguments will sort-of give you transperancy *)
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let cmd_convert tmpprefix finalpath = "convert -quality 100 -density 120 " ^ tmpprefix ^ ".ps " ^ finalpath ^ " >/dev/null 2>/dev/null"
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(* Putting -bg Transparent in dvipng's arguments will give full-alpha transparency *)
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(* Note that IE have problems with such PNGs and need an additional javascript snippet *)
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(* Putting -bg transparent in dvipng's arguments will give binary transparency *)
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let cmd_dvipng tmpprefix finalpath backcolor = "dvipng -bg \'" ^ backcolor ^ "\' -gamma 1.5 -D 120 -T tight --strict " ^ tmpprefix ^ ".dvi -o " ^ finalpath ^ " >/dev/null 2>/dev/null"
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exception ExternalCommandFailure of string
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let render tmppath finalpath outtex md5 backcolor =
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let tmpprefix0 = (string_of_int (Unix.getpid ()))^"_"^md5 in
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let tmpprefix = (tmppath^"/"^tmpprefix0) in
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let unlink_all () =
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begin
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(* Commenting this block out will aid in debugging *)
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Sys.remove (tmpprefix ^ ".dvi");
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Sys.remove (tmpprefix ^ ".aux");
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Sys.remove (tmpprefix ^ ".log");
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Sys.remove (tmpprefix ^ ".tex");
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if Sys.file_exists (tmpprefix ^ ".ps")
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then Sys.remove (tmpprefix ^ ".ps");
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end in
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let f = (Util.open_out_unless_exists (tmpprefix ^ ".tex")) in
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begin
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(* Assemble final output in file 'f' *)
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output_string f (Texutil.get_preface ());
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output_string f outtex;
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output_string f (Texutil.get_footer ());
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close_out f;
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(* TODO: document *)
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if Util.run_in_other_directory tmppath (cmd_latex tmpprefix0) != 0
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then (
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unlink_all (); raise (ExternalCommandFailure "latex")
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) else if (Sys.command (cmd_dvipng tmpprefix (finalpath^"/"^md5^".png") backcolor) != 0)
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then (
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if (Sys.command (cmd_dvips tmpprefix) != 0)
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then (
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unlink_all ();
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raise (ExternalCommandFailure "dvips")
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) else if (Sys.command (cmd_convert tmpprefix (finalpath^"/"^md5^".png")) != 0)
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then (
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unlink_all ();
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raise (ExternalCommandFailure "convert")
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) else (
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unlink_all ()
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)
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) else (
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unlink_all ()
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)
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end
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