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(************************************************************************)
(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2015     *)
(*   \VV/  **************************************************************)
(*    //   *      This file is distributed under the terms of the       *)
(*         *       GNU Lesser General Public License Version 2.1        *)
(************************************************************************)

(* Modified by Lionel Elie Mamane <lionel@mamane.lu> on 9 & 10 Mar 2004:
 *  - handling of absolute filenames (function coq_module)
 *  - coq_module: chop ./// (arbitrary amount of slashes), not only "./"
 *  - function chop_prefix not useful anymore. Deleted.
 *  - correct typo in usage message: "-R" -> "--R"
 *  - shorten the definition of make_path
 * This notice is made to comply with section 2.a of the GPLv2.
 * It may be removed or abbreviated as far as I am concerned.
 *)

open Cdglobals
open Printf

(*s \textbf{Usage.} Printed on error output. *)

let usage () =
  prerr_endline "";
  prerr_endline "Usage: coqdoc <options and files>";
  prerr_endline "  --html               produce a HTML document (default)";
  prerr_endline "  --latex              produce a LaTeX document";
  prerr_endline "  --texmacs            produce a TeXmacs document";
  prerr_endline "  --raw                produce a text document";
  prerr_endline "  --dvi                output the DVI";
  prerr_endline "  --ps                 output the PostScript";
  prerr_endline "  --pdf                output the Pdf";
  prerr_endline "  --stdout             write output to stdout";
  prerr_endline "  -o <file>            write output in file <file>";
  prerr_endline "  -d <dir>             output files into directory <dir>";
  prerr_endline "  -g                   (gallina) skip proofs";
  prerr_endline "  -s                   (short) no titles for files";
  prerr_endline "  -l                   light mode (only defs and statements)";
  prerr_endline "  -t <string>          give a title to the document";
  prerr_endline "  --body-only          suppress LaTeX/HTML header and trailer";
  prerr_endline "  --with-header <file> prepend <file> as html reader";
  prerr_endline "  --with-footer <file> append <file> as html footer";
  prerr_endline "  --no-index           do not output the index";
  prerr_endline "  --multi-index        index split in multiple files";
  prerr_endline "  --index <string>     set index name (default is index)";
  prerr_endline "  --toc                output a table of contents";
  prerr_endline "  --vernac <file>      consider <file> as a .v file";
  prerr_endline "  --tex <file>         consider <file> as a .tex file";
  prerr_endline "  -p <string>          insert <string> in LaTeX preamble";
  prerr_endline "  --files-from <file>  read file names to process in <file>";
  prerr_endline "  --glob-from <file>   read globalization information from <file>";
  prerr_endline "  --no-glob            don't use any globalization information (no links will be inserted at identifiers)";
  prerr_endline "  --quiet              quiet mode (default)";
  prerr_endline "  --verbose            verbose mode";
  prerr_endline "  --no-externals       no links to Coq standard library";
  prerr_endline "  --external <url> <d> set URL for external library d";
  prerr_endline "  --coqlib <url>       set URL for Coq standard library";
  prerr_endline ("                       (default is " ^ Coq_config.wwwstdlib ^ ")");
  prerr_endline "  --boot               run in boot mode";
  prerr_endline "  --coqlib_path <dir>  set the path where Coq files are installed";
  prerr_endline "  -R <dir> <coqdir>    map physical dir to Coq dir";
  prerr_endline "  -Q <dir> <coqdir>    map physical dir to Coq dir";
  prerr_endline "  --latin1             set ISO-8859-1 input language";
  prerr_endline "  --utf8               set UTF-8 input language";
  prerr_endline "  --charset <string>   set HTML charset";
  prerr_endline "  --inputenc <string>  set LaTeX input encoding";
  prerr_endline "  --interpolate        try to typeset identifiers in comments using definitions in the same module";
  prerr_endline "  --parse-comments     parse regular comments";
  prerr_endline "  --plain-comments     consider comments as non-literate text";
  prerr_endline "  --toc-depth <int>    don't include TOC entries for sections below level <int>";
  prerr_endline "  --no-lib-name        don't display \"Library\" before library names in the toc";
  prerr_endline "  --lib-name <string>  call top level toc entries <string> instead of \"Library\"";
  prerr_endline "  --lib-subtitles      first line comments of the form (** * ModuleName : text *) will be interpreted as subtitles";
  prerr_endline "  --inline-notmono     use a proportional width font for inline code (possibly with a different color)";
  prerr_endline "";
  exit 1

let obsolete s =
  eprintf "Warning: option %s is now obsolete; please update your scripts\n" s

(*s \textbf{Banner.} Always printed. Notice that it is printed on error
    output, so that when the output of [coqdoc] is redirected this header
    is not (unless both standard and error outputs are redirected, of
    course). *)

let banner () =
  eprintf "This is coqdoc version %s, compiled on %s\n"
    Coq_config.version Coq_config.compile_date;
  flush stderr

let target_full_name f =
  match !Cdglobals.target_language with
    | HTML -> f ^ ".html"
    | Raw -> f ^ ".txt"
    | _ -> f ^ ".tex"

(*s \textbf{Separation of files.} Files given on the command line are
    separated according to their type, which is determined by their
    suffix.  Coq files have suffixe \verb!.v! or \verb!.g! and \LaTeX\
    files have suffix \verb!.tex!. *)

let check_if_file_exists f =
  if not (Sys.file_exists f) then begin
    eprintf "coqdoc: %s: no such file\n" f;
    exit 1
  end


(* [paths] maps a physical path to a name *)
let paths = ref []

let add_path dir name =
  let p = normalize_path dir in
  paths := (p,name) :: !paths

(* turn A/B/C into A.B.C *)
let rec name_of_path p name dirname suffix =
  if p = dirname then String.concat "." (if name = "" then suffix else (name::suffix))
  else
    let subdir = Filename.dirname dirname in
    if subdir = dirname then raise Not_found
    else name_of_path p name subdir (Filename.basename dirname::suffix)

let coq_module filename =
  let bfname = Filename.chop_extension filename in
  let dirname, fname = normalize_filename bfname in
  let rec change_prefix = function
    (* Follow coqc: if in scope of -R, substitute logical name *)
    (* otherwise, keep only base name *)
    | [] -> fname
    | (p, name) :: rem ->
	try name_of_path p name dirname [fname]
	with Not_found -> change_prefix rem
  in
  change_prefix !paths

let what_file f =
  check_if_file_exists f;
  if Filename.check_suffix f ".v" || Filename.check_suffix f ".g" then
    Vernac_file (f, coq_module f)
  else if Filename.check_suffix f ".tex" then
    Latex_file f
  else
     (eprintf "\ncoqdoc: don't know what to do with %s\n" f; exit 1)

(*s \textbf{Reading file names from a file.}
 *  File names may be given
 *  in a file instead of being given on the command
 *  line. [(files_from_file f)] returns the list of file names contained
 *  in the file named [f]. These file names must be separated by spaces,
 *  tabulations or newlines.
 *)

let files_from_file f =
  let files_from_channel ch =
    let buf = Buffer.create 80 in
    let l = ref [] in
      try
	while true do
	  match input_char ch with
	    | ' ' | '\t' | '\n' ->
		if Buffer.length buf > 0 then l := (Buffer.contents buf) :: !l;
		Buffer.clear buf
	    | c ->
		Buffer.add_char buf c
	done; []
      with End_of_file ->
	List.rev !l
  in
    try
      check_if_file_exists f;
      let ch = open_in f in
      let l = files_from_channel ch in
	close_in ch;l
    with Sys_error s -> begin
      eprintf "coqdoc: cannot read from file %s (%s)\n" f s;
      exit 1
    end

(*s \textbf{Parsing of the command line.} *)

let dvi = ref false
let ps = ref false
let pdf = ref false

let parse () =
  let files = ref [] in
  let add_file f = files := f :: !files in
  let rec parse_rec = function
    | [] -> ()

    | ("-nopreamble" | "--nopreamble" | "--no-preamble"
      |  "-bodyonly"   | "--bodyonly"   | "--body-only") :: rem ->
	header_trailer := false; parse_rec rem
    | ("-with-header" | "--with-header") :: f ::rem ->
	header_trailer := true; header_file_spec := true; header_file := f; parse_rec rem
    | ("-with-header" | "--with-header") :: [] ->
	usage ()
    | ("-with-footer" | "--with-footer") :: f ::rem ->
	header_trailer := true; footer_file_spec := true; footer_file := f; parse_rec rem
    | ("-with-footer" | "--with-footer") :: [] ->
	usage ()
    | ("-p" | "--preamble") :: s :: rem ->
	Output.push_in_preamble s; parse_rec rem
    | ("-p" | "--preamble") :: [] ->
	usage ()
    | ("-noindex" | "--noindex" | "--no-index") :: rem ->
	index := false; parse_rec rem
    | ("-multi-index" | "--multi-index") :: rem ->
	multi_index := true; parse_rec rem
    | ("-index" | "--index") :: s :: rem ->
	Cdglobals.index_name := s; parse_rec rem
    | ("-index" | "--index") :: [] ->
	usage ()
    | ("-toc" | "--toc" | "--table-of-contents") :: rem ->
	toc := true; parse_rec rem
    | ("-stdout" | "--stdout") :: rem ->
	out_to := StdOut; parse_rec rem
    | ("-o" | "--output") :: f :: rem ->
	out_to := File (Filename.basename f); output_dir := Filename.dirname f; parse_rec rem
    | ("-o" | "--output") :: [] ->
	usage ()
    | ("-d" | "--directory") :: dir :: rem ->
	output_dir := dir; parse_rec rem
    | ("-d" | "--directory") :: [] ->
	usage ()
    | ("-s" | "--short") :: rem ->
	short := true; parse_rec rem
    | ("-l" | "-light" | "--light") :: rem ->
	gallina := true; light := true; parse_rec rem
    | ("-g" | "-gallina" | "--gallina") :: rem ->
	gallina := true; parse_rec rem
    | ("-t" | "-title" | "--title") :: s :: rem ->
	title := s; parse_rec rem
    | ("-t" | "-title" | "--title") :: [] ->
	usage ()
    | ("-latex" | "--latex") :: rem ->
	Cdglobals.target_language := LaTeX; parse_rec rem
    | ("-pdf" | "--pdf") :: rem ->
	Cdglobals.target_language := LaTeX; pdf := true; parse_rec rem
    | ("-dvi" | "--dvi") :: rem ->
	Cdglobals.target_language := LaTeX; dvi := true; parse_rec rem
    | ("-ps" | "--ps") :: rem ->
	Cdglobals.target_language := LaTeX; ps := true; parse_rec rem
    | ("-html" | "--html") :: rem ->
	Cdglobals.target_language := HTML; parse_rec rem
    | ("-texmacs" | "--texmacs") :: rem ->
	Cdglobals.target_language := TeXmacs; parse_rec rem
    | ("-raw" | "--raw") :: rem ->
	Cdglobals.target_language := Raw; parse_rec rem
    | ("-charset" | "--charset") :: s :: rem ->
	Cdglobals.charset := s; parse_rec rem
    | ("-charset" | "--charset") :: [] ->
	usage ()
    | ("-inputenc" | "--inputenc") :: s :: rem ->
	Cdglobals.inputenc := s; parse_rec rem
    | ("-inputenc" | "--inputenc") :: [] ->
	usage ()
    | ("-raw-comments" | "--raw-comments") :: rem ->
	Cdglobals.raw_comments := true; parse_rec rem
    | ("-parse-comments" | "--parse-comments") :: rem ->
	Cdglobals.parse_comments := true; parse_rec rem
    | ("-plain-comments" | "--plain-comments") :: rem ->
	Cdglobals.plain_comments := true; parse_rec rem
    | ("-interpolate" | "--interpolate") :: rem ->
	Cdglobals.interpolate := true; parse_rec rem
    | ("-toc-depth" | "--toc-depth") :: [] ->
      usage ()
    | ("-toc-depth" | "--toc-depth") :: ds :: rem ->
      let d = try int_of_string ds with
                Failure _ ->
                  (eprintf "--toc-depth must be followed by an integer\n";
                   exit 1)
      in
      Cdglobals.toc_depth := Some d;
      parse_rec rem
    | ("-no-lib-name" | "--no-lib-name") :: rem ->
      Cdglobals.lib_name := "";
      parse_rec rem
    | ("-lib-name" | "--lib-name") :: ds :: rem ->
      Cdglobals.lib_name := ds;
      parse_rec rem
    | ("-lib-subtitles" | "--lib-subtitles") :: rem ->
      Cdglobals.lib_subtitles := true;
      parse_rec rem
    | ("-inline-notmono" | "--inline-notmono") :: rem ->
      Cdglobals.inline_notmono := true;
      parse_rec rem

    | ("-latin1" | "--latin1") :: rem ->
	Cdglobals.set_latin1 (); parse_rec rem
    | ("-utf8" | "--utf8") :: rem ->
	Cdglobals.set_utf8 (); parse_rec rem

    | ("-q" | "-quiet" | "--quiet") :: rem ->
	quiet := true; parse_rec rem
    | ("-v" | "-verbose" | "--verbose") :: rem ->
	quiet := false; parse_rec rem

    | ("-h" | "-help" | "-?" | "--help") :: rem ->
	banner (); usage ()
    | ("-V" | "-version" | "--version") :: _ ->
	banner (); exit 0

    | ("-vernac-file" | "--vernac-file") :: f :: rem ->
	check_if_file_exists f;
	add_file (Vernac_file (f, coq_module f)); parse_rec rem
    | ("-vernac-file" | "--vernac-file") :: [] ->
	usage ()
    | ("-tex-file" | "--tex-file") :: f :: rem ->
	add_file (Latex_file f); parse_rec rem
    | ("-tex-file" | "--tex-file") :: [] ->
	usage ()
    | ("-files" | "--files" | "--files-from") :: f :: rem ->
	List.iter (fun f -> add_file (what_file f)) (files_from_file f);
	parse_rec rem
    | ("-files" | "--files") :: [] ->
	usage ()
    | "-R" :: path :: log :: rem ->
	add_path path log; parse_rec rem
    | "-R" :: ([] | [_]) ->
	usage ()
    | "-Q" :: path :: log :: rem ->
	add_path path log; parse_rec rem
    | "-Q" :: ([] | [_]) ->
	usage ()
    | ("-glob-from" | "--glob-from") :: f :: rem ->
	glob_source := GlobFile f; parse_rec rem
    | ("-glob-from" | "--glob-from") :: [] ->
	usage ()
    | ("-no-glob" | "--no-glob") :: rem ->
	glob_source := NoGlob; parse_rec rem
    | ("--no-externals" | "-no-externals" | "-noexternals") :: rem ->
	Cdglobals.externals := false; parse_rec rem
    | ("--external" | "-external") :: u :: logicalpath :: rem ->
	Index.add_external_library logicalpath u; parse_rec rem
    | ("--coqlib" | "-coqlib") :: u :: rem ->
	Cdglobals.coqlib := u; parse_rec rem
    | ("--coqlib" | "-coqlib") :: [] ->
	usage ()
    | ("--boot" | "-boot") :: rem ->
	Cdglobals.coqlib_path := normalize_path (
          Filename.concat
            (Filename.dirname Sys.executable_name)
            Filename.parent_dir_name
        ); parse_rec rem
    | ("--coqlib_path" | "-coqlib_path") :: d :: rem ->
	Cdglobals.coqlib_path := d; parse_rec rem
    | ("--coqlib_path" | "-coqlib_path") :: [] ->
	usage ()
    | f :: rem ->
	add_file (what_file f); parse_rec rem
  in
    parse_rec (List.tl (Array.to_list Sys.argv));
    List.rev !files


(*s The following function produces the output. The default output is
    the \LaTeX\ document: in that case, we just call [Web.produce_document].
    If option \verb!-dvi!, \verb!-ps! or \verb!-html! is invoked, then
    we make calls to \verb!latex! or \verb!dvips! or \verb!pdflatex! accordingly. *)

let locally dir f x =
  let cwd = Sys.getcwd () in
    try
      Sys.chdir dir; let y = f x in Sys.chdir cwd; y
    with e ->
      Sys.chdir cwd; raise e

let clean_temp_files basefile =
  let remove f = try Sys.remove f with _ -> () in
    remove (basefile ^ ".tex");
    remove (basefile ^ ".log");
    remove (basefile ^ ".aux");
    remove (basefile ^ ".toc");
    remove (basefile ^ ".dvi");
    remove (basefile ^ ".ps");
    remove (basefile ^ ".pdf");
    remove (basefile ^ ".haux");
    remove (basefile ^ ".html")

let clean_and_exit file res = clean_temp_files file; exit res

let cat file =
  let c = open_in file in
    try
      while true do print_char (input_char c) done
    with End_of_file ->
      close_in c

let copy src dst =
  let cin = open_in src in
  try
    let cout = open_out dst in
    try
      while true do Pervasives.output_char cout (input_char cin) done
    with End_of_file ->
      close_out cout;
      close_in cin
  with Sys_error e ->
    eprintf "%s\n" e;
    exit 1

(*s Functions for generating output files *)

let gen_one_file l =
  let file = function
    | Vernac_file (f,m) ->
        let sub = if !lib_subtitles then Cpretty.detect_subtitle f m else None in
          Output.set_module m sub;
          Cpretty.coq_file f m
    | Latex_file _ -> ()
  in
    if (!header_trailer) then Output.header ();
    if !toc then Output.make_toc ();
    List.iter file l;
    if !index then Output.make_index();
    if (!header_trailer) then Output.trailer ()

let gen_mult_files l =
  let file = function
    | Vernac_file (f,m) ->
      let sub = if !lib_subtitles then Cpretty.detect_subtitle f m else None in
	let hf = target_full_name m in
        Output.set_module m sub;
	  open_out_file hf;
	  if (!header_trailer) then Output.header ();
	  Cpretty.coq_file f m;
	  if (!header_trailer) then Output.trailer ();
	  close_out_file()
    | Latex_file _ -> ()
  in
    List.iter file l;
    if (!index && !target_language=HTML) then begin
      if (!multi_index) then Output.make_multi_index ();
      open_out_file (!index_name^".html");
      page_title := (if !title <> "" then !title else "Index");
      if (!header_trailer) then Output.header ();
      Output.make_index ();
      if (!header_trailer) then Output.trailer ();
      close_out_file()
    end;
    if (!toc && !target_language=HTML) then begin
      open_out_file "toc.html";
      page_title := (if !title <> "" then !title else "Table of contents");
      if (!header_trailer) then Output.header ();
      if !title <> "" then printf "<h1>%s</h1>\n" !title;
      Output.make_toc ();
      if (!header_trailer) then Output.trailer ();
      close_out_file()
    end
    (* NB: for latex and texmacs, a separated toc or index is meaningless... *)

let read_glob_file vfile f =
  try Index.read_glob vfile f
  with Sys_error s -> eprintf "Warning: %s (links will not be available)\n" s

let read_glob_file_of = function
  | Vernac_file (f,_) ->
      read_glob_file (Some f) (Filename.chop_extension f ^ ".glob")
  | Latex_file _ -> ()

let index_module = function
  | Vernac_file (f,m) ->
      Index.add_module m
  | Latex_file _ -> ()

let copy_style_file file =
  let src =
    List.fold_left
      Filename.concat !Cdglobals.coqlib_path ["tools";"coqdoc";file] in
  let dst = coqdoc_out file in
  if Sys.file_exists src then copy src dst
  else eprintf "Warning: file %s does not exist\n" src

let produce_document l =
  if !target_language=HTML then copy_style_file "coqdoc.css";
  if !target_language=LaTeX then copy_style_file "coqdoc.sty";
  (match !Cdglobals.glob_source with
    | NoGlob -> ()
    | DotGlob -> List.iter read_glob_file_of l
    | GlobFile f -> read_glob_file None f);
  List.iter index_module l;
  match !out_to with
    | StdOut ->
	Cdglobals.out_channel := stdout;
	gen_one_file l
    | File f ->
	open_out_file f;
	gen_one_file l;
	close_out_file()
    | MultFiles ->
	gen_mult_files l

let produce_output fl =
  if not (!dvi || !ps || !pdf) then
    produce_document fl
  else
    begin
      let texfile = Filename.temp_file "coqdoc" ".tex" in
      let basefile = Filename.chop_suffix texfile ".tex" in
      let final_out_to = !out_to in
	out_to := File texfile;
	output_dir := (Filename.dirname texfile);
	produce_document fl;

	let latexexe = if !pdf then "pdflatex" else "latex" in
	let latexcmd =
	  let file = Filename.basename texfile in
	  let file =
	    if !quiet then sprintf "'\\nonstopmode\\input{%s}'" file else file
	  in
	    sprintf "%s %s && %s %s 1>&2 %s" latexexe file latexexe file (if !quiet then "> /dev/null" else "")
	in
	let res = locally (Filename.dirname texfile) Sys.command latexcmd in
	  if res <> 0 then begin
	      eprintf "Couldn't run LaTeX successfully\n";
	      clean_and_exit basefile res
	    end;

	  let dvifile = basefile ^ ".dvi" in
	    if !dvi then
	      begin
		match final_out_to with
		  | MultFiles | StdOut -> cat dvifile
		  | File f -> copy dvifile f
	      end;
	  let pdffile = basefile ^ ".pdf" in
	    if !pdf then
            begin
	        match final_out_to with
		  | MultFiles | StdOut -> cat pdffile
		  | File f -> copy pdffile f
	    end;
	    if !ps then begin
	        let psfile = basefile ^ ".ps"
		in
		let command =
		  sprintf "dvips %s -o %s %s" dvifile psfile
		    (if !quiet then "> /dev/null 2>&1" else "")
		in
		let res = Sys.command command in
		  if res <> 0 then begin
		      eprintf "Couldn't run dvips successfully\n";
		      clean_and_exit basefile res
		    end;
		  match final_out_to with
		    | MultFiles | StdOut -> cat psfile
		    | File f -> copy psfile f
	      end;

	    clean_temp_files basefile
    end


(*s \textbf{Main program.} Print the banner, parse the command line,
    read the files and then call [produce_document] from module [Web]. *)

let main () =
  let files = parse () in
    Index.init_coqlib_library ();
    if not !quiet then banner ();
    if files <> [] then produce_output files

let _ = Printexc.catch main ()