(*  Title:      Pure/Thy/present.ML

     Author:     Markus Wenzel and Stefan Berghofer, TU Muenchen

 Theory presentation: HTML, graph files, (PDF)LaTeX documents.

 *)

 signature BASIC_PRESENT =

 sig

   val no_document: ('a -> 'b) -> 'a -> 'b  (*not thread-safe!*)

 end;

 signature PRESENT =

 sig

   include BASIC_PRESENT

   val session_name: theory -> string

   val write_graph: {name: string, ID: string, dir: string, unfold: bool,

    path: string, parents: string list} list -> Path.T -> unit

   val display_graph: {name: string, ID: string, dir: string, unfold: bool,

    path: string, parents: string list} list -> unit

   val init: bool -> bool -> string -> bool -> string list -> string list ->

     string -> (bool * Path.T) option -> Url.T option * bool -> bool ->

     theory list -> unit  (*not thread-safe!*)

   val finish: unit -> unit  (*not thread-safe!*)

   val init_theory: string -> unit

   val theory_source: string -> (unit -> HTML.text) -> unit

   val theory_output: string -> string -> unit

   val begin_theory: int -> Path.T -> (Path.T * bool) list -> theory -> theory

   val drafts: string -> Path.T list -> Path.T

 end;

 structure Present: PRESENT =

 struct

 (** paths **)

 val output_path = Path.variable "ISABELLE_BROWSER_INFO";

 val tex_ext = Path.ext "tex";

 val tex_path = tex_ext o Path.basic;

 val html_ext = Path.ext "html";

 val html_path = html_ext o Path.basic;

 val index_path = Path.basic "index.html";

 val readme_html_path = Path.basic "README.html";

 val readme_path = Path.basic "README";

 val documentN = "document";

 val document_path = Path.basic documentN;

 val doc_indexN = "session";

 val graph_path = Path.basic "session.graph";

 val graph_pdf_path = Path.basic "session_graph.pdf";

 val graph_eps_path = Path.basic "session_graph.eps";

 val session_path = Path.basic ".session";

 val session_entries_path = Path.explode ".session/entries";

 val pre_index_path = Path.explode ".session/pre-index";

 fun mk_rel_path [] ys = Path.make ys

   | mk_rel_path xs [] = Path.appends (replicate (length xs) Path.parent)

   | mk_rel_path (ps as x :: xs) (qs as y :: ys) = if x = y then mk_rel_path xs ys else

       Path.appends (replicate (length ps) Path.parent @ [Path.make qs]);

 fun show_path path = Path.implode (Path.append (File.pwd ()) path);

 (** additional theory data **)

 structure Browser_Info = Theory_Data

 (

   type T = {name: string, session: string list, is_local: bool};

   val empty = {name = "", session = [], is_local = false}: T;

   fun extend _ = empty;

   fun merge _ = empty;

 );

 val put_info = Browser_Info.put;

 val get_info = Browser_Info.get;

 val session_name = #name o get_info;

 (** graphs **)

 type graph_node =

   {name: string, ID: string, dir: string, unfold: bool,

    path: string, parents: string list};

 fun write_graph gr path =

   File.write path (cat_lines (map (fn {name, ID, dir, unfold, path, parents} =>

     "\"" ^ name ^ "\" \"" ^ ID ^ "\" \"" ^ dir ^ (if unfold then "\" + \"" else "\" \"") ^

     path ^ "\" > " ^ space_implode " " (map quote parents) ^ " ;") gr));

 fun display_graph gr =

   let

     val path = Isabelle_System.create_tmp_path "graph" "";

     val _ = write_graph gr path;

     val _ = writeln "Displaying graph ...";

     val _ = Isabelle_System.isabelle_tool "browser" ("-c " ^ File.shell_path path ^ " &");

   in () end;

 fun ID_of sess s = space_implode "/" (sess @ [s]);

 fun ID_of_thy thy = ID_of (#session (get_info thy)) (Context.theory_name thy);

 (*retrieve graph data from initial collection of theories*)

 fun init_graph remote_path curr_sess = rev o map (fn thy =>

   let

     val name = Context.theory_name thy;

     val {name = sess_name, session, is_local} = get_info thy;

     val entry =

      {name = name, ID = ID_of session name, dir = sess_name,

       path =

         if null session then "" else

         if is_some remote_path andalso not is_local then

           Url.implode (Url.append (the remote_path) (Url.File

             (Path.append (Path.make session) (html_path name))))

         else Path.implode (Path.append (mk_rel_path curr_sess session) (html_path name)),

       unfold = false,

       parents = map ID_of_thy (Theory.parents_of thy)};

   in (0, entry) end);

 fun ins_graph_entry (i, entry as {ID, ...}) (gr: (int * graph_node) list) =

   (i, entry) :: filter_out (fn (_, entry') => #ID entry' = ID) gr;

 (** global browser info state **)

 (* type theory_info *)

 type theory_info = {tex_source: Buffer.T, html_source: Buffer.T, html: Buffer.T};

 fun make_theory_info (tex_source, html_source, html) =

   {tex_source = tex_source, html_source = html_source, html = html}: theory_info;

 val empty_theory_info = make_theory_info (Buffer.empty, Buffer.empty, Buffer.empty);

 fun map_theory_info f {tex_source, html_source, html} =

   make_theory_info (f (tex_source, html_source, html));

 (* type browser_info *)

 type browser_info = {theories: theory_info Symtab.table, files: (Path.T * string) list,

   tex_index: (int * string) list, html_index: (int * string) list, graph: (int * graph_node) list};

 fun make_browser_info (theories, files, tex_index, html_index, graph) =

   {theories = theories, files = files, tex_index = tex_index, html_index = html_index,

     graph = graph}: browser_info;

 val empty_browser_info = make_browser_info (Symtab.empty, [], [], [], []);

 fun init_browser_info remote_path curr_sess thys = make_browser_info

   (Symtab.empty, [], [], [], init_graph remote_path curr_sess thys);

 fun map_browser_info f {theories, files, tex_index, html_index, graph} =

   make_browser_info (f (theories, files, tex_index, html_index, graph));

 (* state *)

 val browser_info = Unsynchronized.ref empty_browser_info;

 fun change_browser_info f =

   CRITICAL (fn () => Unsynchronized.change browser_info (map_browser_info f));

 val suppress_tex_source = Unsynchronized.ref false;

 fun no_document f x = Unsynchronized.setmp suppress_tex_source true f x;

 fun init_theory_info name info =

   change_browser_info (fn (theories, files, tex_index, html_index, graph) =>

     (Symtab.update (name, info) theories, files, tex_index, html_index, graph));

 fun change_theory_info name f =

   change_browser_info (fn (theories, files, tex_index, html_index, graph) =>

     (case Symtab.lookup theories name of

       NONE => error ("Browser info: cannot access theory document " ^ quote name)

     | SOME info => (Symtab.update (name, map_theory_info f info) theories, files,

         tex_index, html_index, graph)));

 fun add_file file =

   change_browser_info (fn (theories, files, tex_index, html_index, graph) =>

     (theories, file :: files, tex_index, html_index, graph));

 fun add_tex_index txt =

   change_browser_info (fn (theories, files, tex_index, html_index, graph) =>

     (theories, files, txt :: tex_index, html_index, graph));

 fun add_html_index txt =

   change_browser_info (fn (theories, files, tex_index, html_index, graph) =>

     (theories, files, tex_index, txt :: html_index, graph));

 fun add_graph_entry entry =

   change_browser_info (fn (theories, files, tex_index, html_index, graph) =>

     (theories, files, tex_index, html_index, ins_graph_entry entry graph));

 fun add_tex_source name txt =

   if ! suppress_tex_source then ()

   else change_theory_info name (fn (tex_source, html_source, html) =>

     (Buffer.add txt tex_source, html_source, html));

 fun add_html_source name txt = change_theory_info name (fn (tex_source, html_source, html) =>

   (tex_source, Buffer.add txt html_source, html));

 (** global session state **)

 (* session_info *)

 type session_info =

   {name: string, parent: string, session: string, path: string list, html_prefix: Path.T,

     info: bool, doc_format: string, doc_graph: bool, documents: (string * string) list,

     dump_prefix: (bool * Path.T) option, remote_path: Url.T option, verbose: bool,

     readme: Path.T option};

 fun make_session_info

   (name, parent, session, path, html_prefix, info, doc_format, doc_graph, documents,

     dump_prefix, remote_path, verbose, readme) =

   {name = name, parent = parent, session = session, path = path, html_prefix = html_prefix,

     info = info, doc_format = doc_format, doc_graph = doc_graph, documents = documents,

     dump_prefix = dump_prefix, remote_path = remote_path, verbose = verbose,

     readme = readme}: session_info;

 (* state *)

 val session_info = Unsynchronized.ref (NONE: session_info option);

 fun session_default x f = (case ! session_info of NONE => x | SOME info => f info);

 (** document preparation **)

 (* maintain index *)

 val session_entries =

   HTML.session_entries o

     map (fn name => (Url.File (Path.append (Path.basic name) index_path), name));

 fun get_entries dir =

   split_lines (File.read (Path.append dir session_entries_path));

 fun put_entries entries dir =

   File.write (Path.append dir session_entries_path) (cat_lines entries);

 fun create_index dir =

   File.read (Path.append dir pre_index_path) ^

     session_entries (get_entries dir) ^ HTML.end_document

   |> File.write (Path.append dir index_path);

 fun update_index dir name =

   (case try get_entries dir of

     NONE => warning ("Browser info: cannot access session index of " ^ Path.print dir)

   | SOME es => (put_entries ((remove (op =) name es) @ [name]) dir; create_index dir));

 (* document variants *)

 fun read_variant str =

   (case space_explode "=" str of

     [name] => (name, "")

   | [name, tags] => (name, tags)

   | _ => error ("Malformed document variant specification: " ^ quote str));

 fun read_variants strs =

   rev (distinct (eq_fst (op =)) (rev ((documentN, "") :: map read_variant strs)))

   |> filter_out (fn (_, s) => s = "-");

 (* init session *)

 fun name_of_session elems = space_implode "/" ("Isabelle" :: elems);

 fun init build info doc doc_graph doc_variants path name dump_prefix

     (remote_path, first_time) verbose thys =

   if not build andalso not info andalso doc = "" andalso is_none dump_prefix then

     (browser_info := empty_browser_info; session_info := NONE)

   else

     let

       val parent_name = name_of_session (take (length path - 1) path);

       val session_name = name_of_session path;

       val sess_prefix = Path.make path;

       val html_prefix = Path.append (Path.expand output_path) sess_prefix;

       val documents =

         if doc = "" then []

         else if not (can File.check_dir document_path) then

           (if verbose then Output.physical_stderr "Warning: missing document directory\n"

            else (); [])

         else read_variants doc_variants;

       val parent_index_path = Path.append Path.parent index_path;

       val index_up_lnk =

         if first_time then

           Url.append (the remote_path) (Url.File (Path.append sess_prefix parent_index_path))

         else Url.File parent_index_path;

       val readme =

         if File.exists readme_html_path then SOME readme_html_path

         else if File.exists readme_path then SOME readme_path

         else NONE;

       val docs =

         (case readme of NONE => [] | SOME p => [(Url.File p, "README")]) @

           map (fn (name, _) => (Url.File (Path.ext doc (Path.basic name)), name)) documents;

       val index_text = HTML.begin_index (index_up_lnk, parent_name)

         (Url.File index_path, session_name) docs (Url.explode "medium.html");

     in

       session_info :=

         SOME (make_session_info (name, parent_name, session_name, path, html_prefix,

           info, doc, doc_graph, documents, dump_prefix, remote_path, verbose, readme));

       browser_info := init_browser_info remote_path path thys;

       add_html_index (0, index_text)

     end;

 (* isabelle tool wrappers *)

 fun isabelle_document verbose format name tags path result_path =

   let

     val s = "\"$ISABELLE_TOOL\" document -c -o '" ^ format ^ "' \

       \-n '" ^ name ^ "' -t '" ^ tags ^ "' " ^ File.shell_path path ^ " 2>&1";

     val doc_path = Path.append result_path (Path.ext format (Path.basic name));

     val _ = if verbose then writeln s else ();

     val (out, rc) = Isabelle_System.bash_output s;

     val _ =

       if not (File.exists doc_path) orelse rc <> 0 then

         cat_error out ("Failed to build document " ^ quote (show_path doc_path))

       else if verbose then writeln out

       else ();

   in doc_path end;

 fun isabelle_browser graph = Isabelle_System.with_tmp_dir "browser" (fn dir =>

   let

     val pdf_path = Path.append dir graph_pdf_path;

     val eps_path = Path.append dir graph_eps_path;

     val graph_path = Path.append dir graph_path;

     val _ = write_graph graph graph_path;

     val args = "-o " ^ File.shell_path pdf_path ^ " " ^ File.shell_path graph_path;

   in

     if Isabelle_System.isabelle_tool "browser" args = 0 andalso

       File.exists pdf_path andalso File.exists eps_path

     then (File.read pdf_path, File.read eps_path)

     else error "Failed to prepare dependency graph"

   end);

 (* finish session -- output all generated text *)

 fun sorted_index index = map snd (sort (int_ord o pairself fst) (rev index));

 fun index_buffer index = Buffer.add (implode (sorted_index index)) Buffer.empty;

 fun write_tex src name path =

   File.write_buffer (Path.append path (tex_path name)) src;

 fun write_tex_index tex_index path =

   write_tex (index_buffer tex_index |> Buffer.add Latex.tex_trailer) doc_indexN path;

 fun finish () =

   session_default () (fn {name, info, html_prefix, doc_format,

     doc_graph, documents, dump_prefix, path, verbose, readme, ...} =>

   let

     val {theories, files, tex_index, html_index, graph} = ! browser_info;

     val thys = Symtab.dest theories;

     val parent_html_prefix = Path.append html_prefix Path.parent;

     fun finish_tex path (a, {tex_source, ...}: theory_info) = write_tex tex_source a path;

     fun finish_html (a, {html, ...}: theory_info) =

       File.write_buffer (Path.append html_prefix (html_path a)) (Buffer.add HTML.end_document html);

     val sorted_graph = sorted_index graph;

     val opt_graphs =

       if doc_graph andalso (not (null documents) orelse is_some dump_prefix) then

         SOME (isabelle_browser sorted_graph)

       else NONE;

     fun prepare_sources cp path =

      (Isabelle_System.mkdirs path;

       if cp then Isabelle_System.copy_dir document_path path else ();

       Isabelle_System.isabelle_tool "latex"

         ("-o sty " ^ File.shell_path (Path.append path (Path.basic "root.tex")));

       (case opt_graphs of NONE => () | SOME (pdf, eps) =>

         (File.write (Path.append path graph_pdf_path) pdf;

           File.write (Path.append path graph_eps_path) eps));

       write_tex_index tex_index path;

       List.app (finish_tex path) thys);

     val _ =

       if info then

        (Isabelle_System.mkdirs (Path.append html_prefix session_path);

         File.write_buffer (Path.append html_prefix pre_index_path) (index_buffer html_index);

         File.write (Path.append html_prefix session_entries_path) "";

         create_index html_prefix;

         if length path > 1 then update_index parent_html_prefix name else ();

         (case readme of NONE => () | SOME path => File.copy path html_prefix);

         write_graph sorted_graph (Path.append html_prefix graph_path);

         Isabelle_System.isabelle_tool "browser" "-b";

         File.copy (Path.explode "~~/lib/browser/GraphBrowser.jar") html_prefix;

         List.app (fn (a, txt) => File.write (Path.append html_prefix (Path.basic a)) txt)

           (HTML.applet_pages name (Url.File index_path, name));

         File.copy (Path.explode "~~/etc/isabelle.css") html_prefix;

         List.app finish_html thys;

         List.app (uncurry File.write) files;

         if verbose then Output.physical_stderr ("Browser info at " ^ show_path html_prefix ^ "\n")

         else ())

       else ();

     val _ =

       (case dump_prefix of NONE => () | SOME (cp, path) =>

        (prepare_sources cp path;

         if verbose then Output.physical_stderr ("Document sources at " ^ show_path path ^ "\n")

         else ()));

     val doc_paths =

       documents |> Par_List.map (fn (name, tags) =>

         let

           val path = Path.append html_prefix (Path.basic name);

           val _ = prepare_sources true path;

         in isabelle_document true doc_format name tags path html_prefix end);

     val _ =

       if verbose then

         doc_paths

         |> List.app (fn doc => Output.physical_stderr ("Document at " ^ show_path doc ^ "\n"))

       else ();

   in

     browser_info := empty_browser_info;

     session_info := NONE

   end);

 (* theory elements *)

 fun init_theory name = session_default () (fn _ => init_theory_info name empty_theory_info);

 fun theory_source name mk_text =

   session_default () (fn _ => add_html_source name (HTML.theory_source (mk_text ())));

 fun theory_output name s =

   session_default () (fn _ => add_tex_source name (Latex.isabelle_file name s));

 fun parent_link remote_path curr_session thy =

   let

     val {name = _, session, is_local} = get_info thy;

     val name = Context.theory_name thy;

     val link =

       if null session then NONE

       else SOME

        (if is_some remote_path andalso not is_local then

          Url.append (the remote_path) (Url.File (Path.append (Path.make session) (html_path name)))

         else Url.File (Path.append (mk_rel_path curr_session session) (html_path name)));

   in (link, name) end;

 fun begin_theory update_time dir files thy =

     session_default thy (fn {name = sess_name, session, path, html_prefix, remote_path, ...} =>

   let

     val name = Context.theory_name thy;

     val parents = Theory.parents_of thy;

     val parent_specs = map (parent_link remote_path path) parents;

     val files_html = files |> map (fn (raw_path, loadit) =>

       let

         val path = File.check_file (File.full_path dir raw_path);

         val base = Path.base path;

         val base_html = html_ext base;

         val _ = add_file (Path.append html_prefix base_html,

           HTML.external_file (Url.File base) (File.read path));

       in (Url.File base_html, Url.File raw_path, loadit) end);

     fun prep_html_source (tex_source, html_source, html) =

       let

         val txt = HTML.begin_theory (Url.File index_path, session)

           name parent_specs files_html (Buffer.content html_source)

       in (tex_source, Buffer.empty, Buffer.add txt html) end;

     val entry =

      {name = name, ID = ID_of path name, dir = sess_name, unfold = true,

       path = Path.implode (html_path name),

       parents = map ID_of_thy parents};

   in

     change_theory_info name prep_html_source;

     add_graph_entry (update_time, entry);

     add_html_index (update_time, HTML.theory_entry (Url.File (html_path name), name));

     add_tex_index (update_time, Latex.theory_entry name);

     put_info {name = sess_name, session = path, is_local = is_some remote_path} thy

   end);

 (** draft document output **)

 fun drafts doc_format src_paths = Isabelle_System.with_tmp_dir "drafts" (fn dir =>

   let

     fun prep_draft path i =

       let

         val base = Path.base path;

         val name =

           (case Path.implode (#1 (Path.split_ext base)) of

             "" => "DUMMY"

           | s => s)  ^ serial_string ();

       in

         if File.exists path then

           (((name, base, File.read path), (i, Latex.theory_entry name)), i + 1)

         else error ("Bad file: " ^ Path.print path)

       end;

     val (srcs, tex_index) = split_list (fst (fold_map prep_draft src_paths 0));

     val doc_path = Path.append dir document_path;

     val _ = Isabelle_System.mkdirs doc_path;

     val root_path = Path.append doc_path (Path.basic "root.tex");

     val _ = File.copy (Path.explode "~~/lib/texinputs/draft.tex") root_path;

     val _ = Isabelle_System.isabelle_tool "latex" ("-o sty " ^ File.shell_path root_path);

     val _ = Isabelle_System.isabelle_tool "latex" ("-o syms " ^ File.shell_path root_path);

     fun known name =

       let val ss = split_lines (File.read (Path.append doc_path (Path.basic name)))

       in member (op =) ss end;

     val known_syms = known "syms.lst";

     val known_ctrls = known "ctrls.lst";

     val _ = srcs |> List.app (fn (name, base, txt) =>

       Symbol.explode txt

       |> Latex.symbol_source (known_syms, known_ctrls) (Path.implode base)

       |> File.write (Path.append doc_path (tex_path name)));

     val _ = write_tex_index tex_index doc_path;

     val result = isabelle_document false doc_format documentN "" doc_path dir;

     val result' = Isabelle_System.create_tmp_path documentN doc_format;

     val _ = File.copy result result';

   in result' end);

 end;

 structure Basic_Present: BASIC_PRESENT = Present;

 open Basic_Present;