src/Pure/Thy/present.ML

File.bash_string operations in ML as in Scala -- exclusively for GNU bash, not perl and not user output;
clarified treatment of whitespace in some bash scripts;

(*  Title:      Pure/Thy/present.ML
    Author:     Markus Wenzel and Stefan Berghofer, TU Muenchen

Theory presentation: HTML and PDF-LaTeX documents.
*)

signature PRESENT =
sig
  val session_name: theory -> string
  val session_graph: string -> (string -> bool) -> theory -> Graph_Display.entry list
  val document_enabled: string -> bool
  val document_variants: string -> (string * string) list
  val init: HTML.symbols -> bool -> bool -> Path.T -> string -> string -> (string * string) list ->
    (Path.T * Path.T) list -> Path.T -> string * string -> bool -> unit
  val finish: unit -> unit
  val theory_output: string -> string -> unit
  val begin_theory: int -> (unit -> HTML.text) -> theory -> theory
  val display_drafts: Path.T list -> int
end;

structure Present: PRESENT =
struct


(** paths **)

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 documentN = "document";
val document_path = Path.basic documentN;
val doc_indexN = "session";
val session_graph_path = Path.basic "session_graph.pdf";

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



(** additional theory data **)

structure Browser_Info = Theory_Data
(
  type T = {chapter: string, name: string};
  val empty = {chapter = "Unsorted", name = "Unknown"}: T;
  fun extend _ = empty;
  fun merge _ = empty;
);

val _ = Theory.setup
  (Browser_Info.put {chapter = Context.PureN, name = Context.PureN});

val session_name = #name o Browser_Info.get;


(* session graph *)

fun session_graph parent_session parent_loaded =
  let
    val parent_session_name = "session." ^ parent_session;
    val parent_session_node = Graph_Display.content_node ("[" ^ parent_session ^ "]") [];
    fun node_name name = if parent_loaded name then parent_session_name else "theory." ^ name;
    fun theory_entry thy =
      let
        val name = Context.theory_name thy;
        val deps = map (node_name o Context.theory_name) (Theory.parents_of thy);
      in
        if parent_loaded name then NONE
        else SOME ((node_name name, Graph_Display.content_node name []), deps)
      end;
  in
    fn thy =>
      ((parent_session_name, parent_session_node), []) ::
        map_filter theory_entry (Theory.nodes_of thy)
  end;



(** global browser info state **)

(* type theory_info *)

type theory_info = {tex_source: string, html_source: string};

fun make_theory_info (tex_source, html_source) =
  {tex_source = tex_source, html_source = html_source}: theory_info;

fun map_theory_info f {tex_source, html_source} =
  make_theory_info (f (tex_source, html_source));


(* type browser_info *)

type browser_info =
 {theories: theory_info Symtab.table,
  tex_index: (int * string) list,
  html_index: (int * string) list};

fun make_browser_info (theories, tex_index, html_index) : browser_info =
  {theories = theories, tex_index = tex_index, html_index = html_index};

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

fun map_browser_info f {theories, tex_index, html_index} =
  make_browser_info (f (theories, tex_index, html_index));


(* state *)

val browser_info = Synchronized.var "browser_info" empty_browser_info;
fun change_browser_info f = Synchronized.change browser_info (map_browser_info f);

fun init_theory_info name info =
  change_browser_info (fn (theories, tex_index, html_index) =>
    (Symtab.update (name, info) theories, tex_index, html_index));

fun change_theory_info name f =
  change_browser_info (fn (theories, tex_index, html_index) =>
    (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, tex_index, html_index)));


fun add_tex_index txt =
  change_browser_info (fn (theories, tex_index, html_index) =>
    (theories, txt :: tex_index, html_index));

fun add_html_index txt =
  change_browser_info (fn (theories, tex_index, html_index) =>
    (theories, tex_index, txt :: html_index));



(** global session state **)

(* session_info *)

type session_info =
  {symbols: HTML.symbols, name: string, chapter: string, info_path: Path.T, info: bool,
    doc_format: string, doc_output: Path.T option, doc_files: (Path.T * Path.T) list,
    graph_file: Path.T, documents: (string * string) list, verbose: bool, readme: Path.T option};

fun make_session_info
  (symbols, name, chapter, info_path, info, doc_format, doc_output, doc_files,
    graph_file, documents, verbose, readme) =
  {symbols = symbols, name = name, chapter = chapter, info_path = info_path, info = info,
    doc_format = doc_format, doc_output = doc_output, doc_files = doc_files, graph_file = graph_file,
    documents = documents, verbose = verbose, readme = readme}: session_info;


(* state *)

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

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



(** document preparation **)

(* options *)

fun document_enabled s = s <> "" andalso s <> "false";

fun document_variants str =
  let
    fun read_variant s =
      (case space_explode "=" s of
        [name] => (name, "")
      | [name, tags] => (name, tags)
      | _ => error ("Malformed document variant specification: " ^ quote s));
    val variants = map read_variant (space_explode ":" str);
    val _ =
      (case duplicates (op =) (map #1 variants) of
        [] => ()
      | dups => error ("Duplicate document variants: " ^ commas_quote dups));
  in variants end;


(* init session *)

fun init symbols build info info_path doc document_output doc_variants doc_files graph_file
    (chapter, name) verbose =
  if not build andalso not info andalso doc = "" then
    (Synchronized.change browser_info (K empty_browser_info); session_info := NONE)
  else
    let
      val doc_output =
        if document_output = "" then NONE else SOME (Path.explode document_output);

      val documents =
        if doc = "" then []
        else if null doc_files andalso not (can File.check_dir document_path) then
          (if verbose then Output.physical_stderr "Warning: missing document directory\n"
           else (); [])
        else doc_variants;

      val readme = if File.exists readme_html_path then SOME readme_html_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;
    in
      session_info :=
        SOME (make_session_info (symbols, name, chapter, info_path, info, doc,
          doc_output, doc_files, graph_file, documents, verbose, readme));
      Synchronized.change browser_info (K empty_browser_info);
      add_html_index (0, HTML.begin_session_index symbols name (Url.File session_graph_path) docs)
    end;


(* isabelle tool wrappers *)

fun isabelle_document {verbose, purge} format name tags dir =
  let
    val s = "\"$ISABELLE_TOOL\" document" ^ (if purge then " -c" else "") ^ " -o '" ^ format ^ "' \
      \-n '" ^ name ^ "' -t '" ^ tags ^ "' " ^ File.bash_path dir ^ " 2>&1";
    val doc_path = Path.appends [dir, Path.parent, Path.basic name |> Path.ext format];
    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;


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

fun sorted_index index = map snd (sort (int_ord o apply2 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_info () (fn {name, chapter, info, info_path, doc_format,
    doc_output, doc_files, graph_file, documents, verbose, readme, ...} =>
  let
    val {theories, tex_index, html_index} = Synchronized.value browser_info;
    val thys = Symtab.dest theories;

    val session_prefix =
      Path.append (Path.append info_path (Path.basic chapter)) (Path.basic name);

    fun finish_html (a, {html_source, ...}: theory_info) =
      File.write (Path.append session_prefix (html_path a)) html_source;

    val _ =
      if info then
       (Isabelle_System.mkdirs session_prefix;
        File.write_buffer (Path.append session_prefix index_path)
          (index_buffer html_index |> Buffer.add HTML.end_document);
        (case readme of NONE => () | SOME path => Isabelle_System.copy_file path session_prefix);
        List.app finish_html thys;
        if verbose
        then Output.physical_stderr ("Browser info at " ^ show_path session_prefix ^ "\n")
        else ())
      else ();

    fun document_job doc_prefix backdrop (doc_name, tags) =
      let
        val doc_dir = Path.append doc_prefix (Path.basic doc_name);
        val _ = Isabelle_System.mkdirs doc_dir;
        val _ =
          Isabelle_System.isabelle_tool "latex"
            ("-o sty " ^ File.bash_path (Path.append doc_dir (Path.basic "root.tex")));
        val _ = List.app (fn file => Isabelle_System.copy_file_base file doc_dir) doc_files;
        val _ = Isabelle_System.copy_file graph_file (Path.append doc_dir session_graph_path);
        val _ = write_tex_index tex_index doc_dir;
        val _ =
          List.app (fn (a, {tex_source, ...}) =>
            write_tex (Buffer.add tex_source Buffer.empty) a doc_dir) thys;
      in
        fn () =>
          (isabelle_document {verbose = true, purge = backdrop} doc_format doc_name tags doc_dir,
            fn doc =>
              if verbose orelse not backdrop then
                Output.physical_stderr ("Document at " ^ show_path doc ^ "\n")
              else ())
      end;

    val jobs =
      (if info orelse is_none doc_output then
        map (document_job session_prefix true) documents
       else []) @
      (case doc_output of
        NONE => []
      | SOME path => map (document_job path false) documents);

    val _ = jobs |> Par_List.map (fn job => job ()) |> List.app (op |>);
  in
    Synchronized.change browser_info (K empty_browser_info);
    session_info := NONE
  end);


(* theory elements *)

fun theory_output name s =
  with_session_info () (fn _ =>
    change_theory_info name (fn (_, html_source) => (Latex.isabelle_theory name s, html_source)));

fun theory_link (curr_chapter, curr_session) thy =
  let
    val {chapter, name = session} = Browser_Info.get thy;
    val link = html_path (Context.theory_name thy);
  in
    if curr_session = session then SOME link
    else if curr_chapter = chapter then
      SOME (Path.appends [Path.parent, Path.basic session, link])
    else if chapter = Context.PureN then NONE
    else SOME (Path.appends [Path.parent, Path.parent, Path.basic chapter, Path.basic session, link])
  end;

fun begin_theory update_time mk_text thy =
  with_session_info thy (fn {symbols, name = session_name, chapter, ...} =>
    let
      val name = Context.theory_name thy;
      val parents = Theory.parents_of thy;

      val parent_specs = parents |> map (fn parent =>
        (Option.map Url.File (theory_link (chapter, session_name) parent),
          (Context.theory_name parent)));
      val html_source = HTML.theory symbols name parent_specs (mk_text ());
    in
      init_theory_info name (make_theory_info ("", html_source));
      add_html_index (update_time, HTML.theory_entry symbols (Url.File (html_path name), name));
      add_tex_index (update_time, Latex.theory_entry name);
      Browser_Info.put {chapter = chapter, name = session_name} thy
    end);



(** draft document output **)

fun display_drafts 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 _ = Isabelle_System.copy_file (Path.explode "~~/lib/texinputs/draft.tex") root_path;
    val _ = Isabelle_System.isabelle_tool "latex" ("-o sty " ^ File.bash_path root_path);
    val _ = Isabelle_System.isabelle_tool "latex" ("-o syms " ^ File.bash_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 {verbose = false, purge = true} "pdf" documentN "" doc_path;

    val target_dir = Path.explode "$ISABELLE_HOME_USER/tmp";
    val target = Path.explode "$ISABELLE_HOME_USER/tmp/drafts.pdf"
    val _ = Isabelle_System.mkdirs target_dir;
    val _ = Isabelle_System.copy_file result target;
  in
    Isabelle_System.isabelle_tool "display" (File.bash_path target ^ " &")
  end);

end;