(*  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 _ = writeln "Displaying graph ...";

    val path = File.tmp_path (Path.explode "tmp.graph");

    val _ = write_graph gr path;

    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 path' = Path.append (Path.make session) (html_path name);

    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 (info as (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));

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

  (tex_source, html_source, Buffer.add txt 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 with_session 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.raw_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) = 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 =

  let

    val pdf_path = File.tmp_path graph_pdf_path;

    val eps_path = File.tmp_path graph_eps_path;

    val gr_path = File.tmp_path graph_path;

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

  in

    write_graph graph gr_path;

    if Isabelle_System.isabelle_tool "browser" args <> 0 orelse

      not (File.exists eps_path) orelse not (File.exists pdf_path)

    then error "Failed to prepare dependency graph"

    else

      let val pdf = File.read pdf_path and eps = File.read eps_path

      in File.rm pdf_path; File.rm eps_path; File.rm gr_path; (pdf, eps) end

  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 () =

  with_session () (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 "~~/lib/html/isabelle.css") html_prefix;

        List.app finish_html thys;

        List.app (uncurry File.write) files;

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

        else ()));

    val doc_paths =

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

        let

          val path = Path.append html_prefix document_path;

          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.raw_stderr ("Document at " ^ show_path doc ^ "\n"))

      else ();

  in

    browser_info := empty_browser_info;

    session_info := NONE

  end);

(* theory elements *)

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

fun theory_source name mk_text =

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

fun theory_output name s =

  with_session () (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 =

    with_session 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 = Thy_Load.check_file 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 **)  (* FIXME doc_path etc. not thread-safe *)

fun drafts doc_format src_paths =

  let

    fun prep_draft path i =

      let

        val base = Path.base path;

        val name =

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

            "" => "DUMMY" ^ serial_string ()

          | s => s);

      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 = File.tmp_path document_path;

    val result_path = Path.append doc_path Path.parent;

    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;

  in isabelle_document false doc_format documentN "" doc_path result_path end;

end;

structure Basic_Present: BASIC_PRESENT = Present;

open Basic_Present;