/*  $Id$

    Part of XPCE --- The SWI-Prolog GUI toolkit

    Author:        Jan Wielemaker and Anjo Anjewierden
    E-mail:        jan@swi.psy.uva.nl
    WWW:           http://www.swi.psy.uva.nl/projects/xpce/
    Copyright (C): 1985-2002, University of Amsterdam

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; either version 2
    of the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    As a special exception, if you link this library with other files,
    compiled with a Free Software compiler, to produce an executable, this
    library does not by itself cause the resulting executable to be covered
    by the GNU General Public License. This exception does not however
    invalidate any other reasons why the executable file might be covered by
    the GNU General Public License.
*/

:- module(prolog_navigator, []).
:- use_module(library(pce)).
:- use_module(library(toc_filesystem)).
:- use_module(library(pce_report)).
:- use_module(library(toolbar)).
:- use_module(library(helpidx)).
:- use_module(library('trace/util')).
:- use_module(browse_xref).
:- use_module(library(persistent_frame)).
:- require([ '$qlf_info'/5
	   , append/3
	   , atomic_list_concat/2
	   , atomic_list_concat/3
	   , file_name_extension/3
	   , flatten/2
	   , gensym/2
	   , member/2
	   , once/1
	   , pce_image_directory/1
	   ]).

:- pce_image_directory(library('trace/icons')).

:- dynamic
	prolog_overview_window/1.

resource(edit,	      image, image('16x16/edit.xpm')).
resource(up,	      image, image('16x16/up.xpm')).
resource(refresh,     image, image('16x16/refresh.xpm')).
resource(butterfly,   image, image('butterfly.xpm')).
resource(dbgsettings, image, image('16x16/dbgsettings.xpm')).

:- pce_begin_class(prolog_navigator, persistent_frame,
		   "Prolog source navigator").

initialise(SB, Root:directory) :->
	send_super(SB, initialise, 'Prolog Navigator'),
	send(SB, icon, resource(butterfly)),
	send(SB, append, new(D, dialog)),
	send(new(W, prolog_source_structure(Root)), below, D),
	send(D, append, new(tool_bar(W))),
	send(D, gap, size(0, 2)),
	send(D, pen, 0),
	send(SB, fill_tool_bar),
	send(new(report_dialog), below, W).

tool_bar(SB, TB:tool_bar) :<-
	"Get the toolbar"::
	get(SB, member, dialog, D),
	get(D, member, tool_bar, TB).

fill_tool_bar(SB) :->
	"Fill the toolbar"::
	get(SB, tool_bar, TB),
	send_list(TB, append,
		  [ tool_button(up,
				resource(up),
				'Up one level'),
		    tool_button(refresh,
				resource(refresh),
				'Update view'),
		    gap,
		    tool_button(debug_settings,
				resource(dbgsettings),
				'Edit breakpoints'),
		    tool_button(edit,
				resource(edit),
				'Open file in editor')
		  ]).

goto(SB, File:file, Line:int) :->
	"Expand and highlight tree for given location"::
	get(SB, member, prolog_source_structure, FB),
	send(FB, goto, File, Line).

directory(SB, Dir:directory) :->
	"Make directory visible"::
	get(SB, member, prolog_source_structure, FB),
	get(FB, dir_node, Dir, @on, _Node).

:- pce_end_class(prolog_navigator).


:- pce_begin_class(prolog_source_structure, toc_filesystem,
		   "Browser for (prolog) source-files").

class_variable(auto_refresh, int*, @nil).
class_variable(size,	size,	size(200, 500),
	       "Intial window size").

variable(file_pattern,	regex, get, "Pattern of showed files").

initialise(FB, Root:directory) :->
	source_pattern(Regex),
	send(FB, slot, file_pattern, Regex),
	send_super(FB, initialise, Root),
	send(FB?frame, label, 'SWI-Prolog Navigator'),
	asserta(prolog_overview_window(FB)).

source_pattern(Pat) :-
	findall(E, (user:prolog_file_type(E, prolog),
		    \+ user:prolog_file_type(E, qlf)), Exts),
	(   Exts = [Ext]
	->  format(atom(Pat), '.*\\.~w$', [Ext])
	;   atomic_list_concat(Exts, '|', P1),
	    format(atom(Pat), '.*\\.(~w)$', [P1])
	).

unlink(FB) :->
	retractall(prolog_overview_window(FB)),
	send_super(FB, unlink).

make_file_node(_FB, File:file, Node:sb_prolog_file) :<-
	"Return a Prolog source-file node"::
	new(Node, sb_prolog_file(File)).

:- pce_group(navigate).

file_node(FB, File:name, Create:[bool], Node:toc_node) :<-
	"Get node for file, possibly add it to the tree"::
	canonical_source_file(File, Path),
	(   get(FB, node, Path, Node)
	->  true
	;   Create == @on
	->  file_directory_name(Path, Dir),
	    get(FB, dir_node, Dir, @on, DirNode),
	    send(DirNode, collapsed, @off),
	    get(FB, node, Path, Node)
	).

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
->goto: File, Line opens  the  tree   such  that  the indicated position
becomes visible and selects the entity   holding the specified location.
First it looks for the file, then it  assumes the sons are in file-order
and looks for the first son after the requested line. After finding this
it iterates on this.

This method is intended to synchronise with an editor.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

goto(FB, File:'file|node', Line:int) :->
	"Show indicated position"::
	(   send(File, instance_of, file)
	->  get(FB, file_node, File?name, @on, Node)
	;   Node = File
	),
	(   (   get(Node, collapsed, @nil)
	    ;	send(Node, instance_of, sb_predicate)
	    )
	->  send(FB?tree, selection, Node),
	    send(FB, normalise, Node)
	;   send(Node, collapsed, @off),
	    new(N, var(value := @nil)),
	    (	get(Node?sons, find,
		    and(message(@arg1, has_get_method, line),
			if(and(@arg1?line \== @nil,
			       @arg1?line > Line),
			   new(and),
			   and(assign(N, @arg1, global),
			       new(or)))),
		    _)
	    ->	get(N, '_value', N2),
	        (   N2 == @nil
		->  send(FB?tree, selection, Node),
		    send(FB, normalise, Node)
		;   send(FB, goto, N2, Line)
		)
	    ;	get(Node?sons, tail, Last)
	    ->	send(FB, goto, Last, Line)
	    ;	send(FB?tree, selection, Node),
		send(FB, normalise, Node)
	    )
	).

:- pce_group(popup).

popup(FB, Id:any, Popup:popup) :<-
	"Return popup from current node"::
	get(FB, node, Id, Node),
	send(Node, has_get_method, popup),
	get(Node, popup, Popup).

:- pce_group(edit).

edit(FB) :->
	"Edit selected file"::
	(   get(FB, selection, Sel),
	    get(Sel, head, FileNode),
	    send(FileNode, instance_of, sb_prolog_file),
	    get(FileNode, identifier, File),
	    edit(file(File))
	;   send(FB, report, warning, 'No selected file'),
	    fail
	).

debug_settings(_FB) :->
	"Open debug-status editor"::
	prolog_ide(open_debug_status).

:- pce_group(event).

event(FB, Ev:event) :->
	"Deal with identifying nodes"::
	(   send_super(FB, event, Ev)
	->  true
	;   send(Ev, is_a, loc_move)
	->  (	get(FB, hypered, current, Node)
	    ->  (   send(Ev, inside, Node)
		->  true
		;   send(FB, delete_hypers, current),
		    send(FB, report, status, '')
		)
	    ;   get(FB, find, Ev, @arg1?node, Img),
		new(_, hyper(FB, Img, current, toc)),
		get(Img, node, Node),
		(   send(Node, has_send_method, identify)
		->  send(Node, identify)
		;   true
		)
	    )
	).

:- pce_end_class(prolog_source_structure).


:- pce_begin_class(sb_prolog_file, toc_folder,
		   "Display a Prolog file").

initialise(TF, File:file) :->
	get(File, name, FileName),
	canonical_source_file(FileName, Path),
	(   source_file(Path)
	->  Img = 'plloadedfile.xpm'
	;   Img = 'plfile.xpm'
	),
	file_base_name(FileName, Base),
	send_super(TF, initialise, Base, Path, Img),
	send(TF, name, Base).

update_image(_TF) :->
	true.

loaded(TF) :->
	get(TF, identifier, Path),
	source_file(Path).

module(TF, Module:name) :<-
	"Return module defined in this file"::
	get(TF, identifier, Path),
	(   x_browse_info(Path, entity(module(Module), _Line))
	->  true
	;   catch(module_of_path(Path, Module), _, fail)
	).

module_of_path(Path, Module) :-
	open(Path, read, Fd),
	(   peek_char(Fd, '#')		% skip !# line
	->  skip(Fd, 10)
	;   true
	),
	read(Fd, Term),
	close(Fd),
	Term = (:- module(Module, _Public)).

hidden_entity(module(_)).

file_expansion_entity(Path, entity(module(Module), Line)) :-
	once(x_browse_info(Path, entity(module(Module), Line))).
file_expansion_entity(Path, entity(dynamic, -)) :-
	once(file_expansion_entity(Path, entity(dynamic(_), _))).
file_expansion_entity(Path, Entity) :-
	x_browse_info(Path, Entity),
	arg(1, Entity, Term),
	\+ hidden_entity(Term).

expand(TF) :->
	get(TF, identifier, Path),
	get(TF, window, TocWindow),
	x_browse_analyse(Path),
	(   file_expansion_entity(Path, entity(Info, Line)),
	    make_file_toc_entry(Info, Path, Entry),
	    send(TocWindow, son, TF, Entry),
	    send(Entry, file_id, Path),
	    integer(Line),
	    send(Entry, line, Line),
	    fail
	;   true
	).

split_head(M:Head, Name, Arity, M) :- !,
	callable(Head),
	functor(Head, Name, Arity).
split_head(Head, Name, Arity, @nil) :-
	callable(Head),
	functor(Head, Name, Arity).

make_file_toc_entry(predicate(Head), Key, TE) :-
	split_head(Head, Name, Arity, Module),
	new(TE, sb_predicate(Key, Name, Arity, Module)).
make_file_toc_entry(grammar_rule(Head), Key, TE) :-
	split_head(Head, Name, Arity, Module),
	new(TE, sb_predicate(Key, Name, Arity, Module)).
make_file_toc_entry(Term, _Key, TE) :-
	make_file_toc_entry(Term, TE).

make_file_toc_entry(xpce_class(Class, _Super, Doc), TE) :-
	to_summary(Doc, PceDoc),
	new(TE, toc_xpce_class(Class, PceDoc)).
make_file_toc_entry(xpce_class_extension(Class), TE) :-
	new(TE, toc_xpce_class(Class, @default, 'classext.xpm')).
make_file_toc_entry(module(Module), TE) :-
	new(TE, toc_module(Module, @default, 'module.xpm')).
make_file_toc_entry(dynamic, TE) :-
	new(TE, sb_predicate_list(dynamic, @default, 'mini-run.xpm')).

to_summary(Doc, String) :-
	catch(string_to_list(String, Doc), _, fail), !.
to_summary(_, @default).

local_predicate_name(M:Head, Label) :- !,
	callable(Head),
	functor(Head, Name, Arity),
	atomic_list_concat([M, :, Name, /, Arity], Label).
local_predicate_name(Head, Label) :-
	functor(Head, Name, Arity),
	atomic_list_concat([Name, /, Arity], Label).

identify(TF) :->
	"Identify myself"::
	get(TF, identifier, Path),
	(   send(TF, loaded)
	->  send(TF, report, status, 'Loaded file %s', Path)
	;   send(TF, report, status, 'File %s', Path)
	).

:- pce_group(popup).

:- free(@sb_file_popup).
:- pce_global(@sb_file_popup, make_sb_file_popup).

make_sb_file_popup(P) :-
	new(P, popup(source_options)),

	send_list(P, append,
		  [ menu_item(edit,
			      message(@arg1, edit)),
		    menu_item(consult,
			      message(@arg1, consult))
		  ]).

popup(_, Popup:popup) :<-
	Popup = @sb_file_popup.

edit(TF) :->
	get(TF, identifier, Path),
	edit(file(Path)).

consult(TF) :->
	"Load into Prolog"::
	get(TF, identifier, Path),
	ensure_loaded(user:Path).

:- pce_end_class(sb_prolog_file).

:- pce_begin_class(toc_source_folder, toc_folder,
		   "Representation of a source entity").

variable(file_id,	name,	both, "File it was loaded from").
variable(line,		int*,	both, "Line it is associated with").

update_image(_) :->
	true.

open(TE) :->
	"Synonym for ->edit"::
	send(TE, edit).

edit(TE) :->
	"Open definition in editor"::
	get(TE, file_id, File),
	get(TE, line, Line),
	(   integer(Line)
	->  edit(file(File, line(Line)))
	;   send(TE, report, error, 'No source')
	).

has_source(TE) :->
	"Has associated source"::
	get(TE, line, Line),
	integer(Line).

status(TE, Status:{open,close}) :<-
	get(TE, collapsed, Val),
	(   Val == @on
	->  Status = close
	;   Status = open
	).

:- pce_group(popup).

:- free(@source_popup).
:- pce_global(@source_popup, make_source_popup).

make_source_popup(P) :-
	new(P, popup(source_options)),

	send_list(P, append,
		  [ menu_item(edit,
			      message(@arg1, edit),
			      condition := message(@arg1, has_source))
		  ]).

popup(_, Popup:popup) :<-
	Popup = @source_popup.

:- pce_end_class.

:- pce_begin_class(toc_xpce_entity, toc_file,
		   "Representation of an XPCE source entity").

variable(file_id,	name,	both, "File it was loaded from").
variable(line,		int*,	both, "Line it is associated with").


open(TE) :->
	send(TE, edit).

edit(TE) :->
	"Edit the source"::
	get(TE, file_id, File),
	get(TE, line, Line),
	(   integer(Line)
	->  edit(file(File, line(Line)))
	;   send(TE, report, error, 'No source')
	).

has_source(TE) :->
	"Has associated source"::
	get(TE, line, Line),
	integer(Line).

loaded(TE) :->
	"Test if class is loaded"::
	get(TE, identifier, Id),
	atomic_list_concat([_Type, _Name, Class], $, Id),
	pce_prolog_class(Class).

behaviour(TE, Behaviour:behaviour) :<-
	"Get behaviour (if loaded)"::
	get(TE, identifier, Id),
	atomic_list_concat([Type, Name, Class], $, Id),
	get(@pce, convert, Class, class, ClassObj),
	(   Type == send
	->  get(ClassObj, send_method, Name, Behaviour)
	;   Type == get
	->  get(ClassObj, get_method, Name, Behaviour)
	;   Type == var
	->  get(ClassObj, instance_variable, Name, Behaviour)
	;   Type == cvar
	->  get(ClassObj, class_variable, Name, Behaviour)
	).

spy(TE, Val:[bool]) :->
	"Set spy-point"::
	get(TE, behaviour, Behaviour),
	(   Val == @off
	->  nospypce(Behaviour)
	;   spypce(Behaviour)
	).

trace(TE, Val:[bool]) :->
	"Set trace-point"::
	get(TE, behaviour, Behaviour),
	(   Val == @off
	->  notracepce(Behaviour)
	;   tracepce(Behaviour)
	).

identify(TE) :->
	"Identify myself"::
	get(TE, identifier, Id),
	atomic_list_concat([Type, Name, Class], $, Id),
	identify_behaviour(Type, Name, Class, TE).

identify_behaviour(send, Name, Class, TE) :-
	send(TE, report, status, 'XPCE send method %s->%s', Class, Name).
identify_behaviour(get, Name, Class, TE) :-
	send(TE, report, status, 'XPCE get method %s<-%s', Class, Name).
identify_behaviour(var, Name, Class, TE) :-
	send(TE, report, status, 'XPCE instance variable %s-%s', Class, Name).
identify_behaviour(cvar, Name, Class, TE) :-
	send(TE, report, status, 'XPCE class variable %s.%s', Class, Name).

:- pce_group(popup).

:- free(@sb_xpce_behaviour_popup).
:- pce_global(@sb_xpce_behaviour_popup,
	      make_sb_xpce_behaviour_popup).

make_sb_xpce_behaviour_popup(P) :-
	new(P, popup(predicate_options)),

	send_list(P, append,
		  [ menu_item(edit,
			      message(@arg1, open),
			      condition := message(@arg1, has_source)),
		    menu_item(spy,
			      message(@arg1, spy),
			      condition := message(@arg1, loaded)),
		    menu_item(trace,
			      message(@arg1, trace),
			      condition := message(@arg1, loaded))
		  ]).

popup(_, Popup:popup) :<-
	Popup = @sb_xpce_behaviour_popup.

:- pce_end_class(toc_xpce_entity).

:- pce_begin_class(toc_xpce_class, toc_source_folder,
		   "Representation of a class (or extension)").

variable(class_id,	name,	 get, "Class it represents").
variable(summary,	string*, get, "Summary documentation").

initialise(CF, Class:name, Summary:[string], Image:[image]) :->
	"Create from ClassName, Summary and Image"::
	default(Summary, @nil, Sum),
	default(Image, 'class.xpm', Img),
	send_super(CF, initialise, Class, @default, Img),
	send(CF, slot, class_id, Class),
	send(CF, slot, summary, Sum).


expand(CF) :->
	get(CF, identifier, NodeId),
	get(CF, file_id, BrowseId),
	get(CF, class_id, Class),
	get(CF, window, TocWindow),
	(   file_expansion_entity(BrowseId, entity(Info, Line)),
	    make_class_toc_enter(Info, Class, BrowseId, Entry),
	    send(TocWindow, son, NodeId, Entry),
	    send(Entry, file_id, BrowseId),
	    integer(Line),
	    send(Entry, line, Line),
	    fail
	;   true
	).

make_class_toc_enter(xpce_class_local_predicate(Class,Head), Class, Key, TE) :-
	make_file_toc_entry(predicate(Head), Key, TE), !.
make_class_toc_enter(Term, Class, _Key, TE) :-
	make_class_toc_enter(Term, Class, TE).

make_class_toc_enter(xpce_method(send(Class, Name, _Doc)), Class, TE) :-
	atomic_list_concat([send, Name, Class], $, Id),
	new(TE, toc_xpce_entity(Name, Id, 'send.xpm')).
make_class_toc_enter(xpce_method(get(Class, Name, _Doc)), Class, TE) :-
	atomic_list_concat([get, Name, Class], $, Id),
	new(TE, toc_xpce_entity(Name, Id, 'get.xpm')).
make_class_toc_enter(xpce_variable(Class, Name, _Doc), Class, TE) :-
	atomic_list_concat([var, Name, Class], $, Id),
	new(TE, toc_xpce_entity(Name, Id, 'ivar.xpm')).
make_class_toc_enter(xpce_class_variable(Class, Name, _Doc), Class, TE) :-
	atomic_list_concat([cvar, Name, Class], $, Id),
	new(TE, toc_xpce_entity(Name, Id, 'classvar.xpm')).

identify(CF) :->
	"Report who I am"::
	get(CF, class_id, Class),
	(   get(CF, summary, Summary),
	    Summary \== @nil
	->  send(CF, report, status, 'XPCE class %s (%s)', Class, Summary)
	;   send(CF, report, status, 'XPCE class %s', Class)
	).

:- pce_group(popup).

:- free(@sb_xpce_class_popup).
:- pce_global(@sb_xpce_class_popup, make_sb_xpce_class_popup).

make_sb_xpce_class_popup(P) :-
	new(P, popup(source_options)),

	send_list(P, append,
		  [ menu_item(edit,
			      message(@arg1, edit),
			      condition := message(@arg1, has_source),
			      end_group := @on),
		    menu_item(class_details,
			      message(@arg1, class_details),
			      condition := message(@arg1, loaded)),
		    menu_item(class_hierarchy,
			      message(@arg1, class_hierarchy),
			      condition := message(@arg1, loaded))
		  ]).

popup(_, Popup:popup) :<-
	Popup = @sb_xpce_class_popup.

loaded(CF) :->
	"Test if class is loaded"::
	get(CF, class_id, Class),
	pce_prolog_class(Class).

class_details(CF) :->
	"Open ClassBrowser"::
	get(CF, class_id, Class),
	manpce(Class).

class_hierarchy(CF) :->
	"Open and direct ClassHierarchy"::
	get(CF, class_id, Class),
	manpce,
	get(@manual, start_tool, class_hierarchy, Tool),
	send(Tool, focus, Class).

:- pce_end_class(toc_xpce_class).

:- pce_begin_class(toc_module, toc_source_folder,
		   "Representation of the module").

expand(MF) :->
	get(MF, identifier, NodeId),
	get(MF, file_id, BrowseId),
	get(MF, window, TocWindow),
	(   x_browse_info(BrowseId, export(Head)),
	    (	x_browse_info(BrowseId, entity(predicate(Head), Line))
	    ->	make_file_toc_entry(predicate(Head), BrowseId, Entry),
		send(Entry, file_id, BrowseId),
		send(Entry, line, Line)
	    ;   local_predicate_name(Head, Label),
		atom_concat('$export$', Label, Id),
		new(Entry, toc_file(Label, Id, 'pred.xpm'))
	    ),
	    send(TocWindow, son, NodeId, Entry),
	    fail
	;   true
	).

update_image(MF) :->
	get(MF, status, Status),
	image(module, Status, Image),
	send(MF, image, Image).

:- pce_end_class.

:- pce_begin_class(sb_predicate_list, toc_source_folder,
		   "Representation of predicate set").

variable(set,	name,	get, "Name of the represented set").

initialise(PL, Name:name, Id:any, Img:[image]) :->
	send(PL, send_super, initialise, Name, Id, Img),
	send(PL, slot, set, Name).

expand(MF) :->
	get(MF, identifier, NodeId),
	get(MF, set, Set),
	get(MF, file_id, BrowseId),
	get(MF, window, TocWindow),
	Term =.. [Set, Head],
	(   file_expansion_entity(BrowseId, entity(Term, Line)),
	    make_file_toc_entry(predicate(Head), BrowseId, Entry),
	    send(Entry, file_id, BrowseId),
	    send(Entry, line, Line),
	    send(TocWindow, son, NodeId, Entry),
	    fail
	;   true
	).

update_image(MF) :->
	get(MF, set, Set),
	get(MF, status, Status),
	image(Set, Status, Image),
	send(MF, image, Image).

:- pce_end_class.

:- pce_begin_class(sb_predicate, toc_source_folder,
		   "Represents a predicate").

variable(name,		 name,	get, "Name of the represented predicate").
variable(arity,		 int,	get, "Arity of it").
variable(module,	 name*,	get, "Module (or local)").
variable(classification, name,	get, "Class of the predicate").

initialise(P, BrowseId:name, Name:name, Arity:int, Module:[name]*) :->
	default(Module, @nil, M),
	functor(Head0, Name, Arity),
	(   M == @nil
	->  Head = Head0
	;   Head = M:Head0
	),
	local_predicate_name(Head, Label),
	classify_predicate(Head, BrowseId, Classification),
	send(P, slot, classification, Classification),
	image(predicate, Classification, Img),
	send(P, send_super, initialise, Label, @default, Img),
	send(P, slot, name, Name),
	send(P, slot, arity, Arity),
	send(P, slot, module, M),
	(   expandable(Head, Classification)
	->  true
	;   send(P, collapsed, @nil)
	).

file_node(P, Node:sb_prolog_file) :<-
	"Find associated file-node"::
	file_node(P, Node).

file_node(Node, Node) :-
	send(Node, instance_of, sb_prolog_file), !.
file_node(Node, FileNode) :-
	get_chain(Node, parents, Parents),
	member(Parent, Parents),
	file_node(Parent, FileNode), !.

head(P, Qualify:[bool], Head:prolog) :<-
	"Get the head"::
	get(P, module, M),
	get(P, name, Name),
	get(P, arity, Arity),
	functor(Head0, Name, Arity),
	(   M == @nil
	->  (   Qualify == @on
	    ->	(   get(P, file_node, SbPrologFile),
		    get(SbPrologFile, module, Module)
		->  Head = Module:Head0
		;   Head = user:Head0
		)
	    ;	Head = Head0
	    )
	;   Head = M:Head0
	).

expandable(Head, _) :-
	prolog_xbrowse:called(_, Head).

classify_predicate(Head, Key, dcg) :-
	x_browse_info(Key, entity(grammar_rule(Head), _)), !.
classify_predicate(Head, Key, dynamic) :-
	x_browse_info(Key, entity(dynamic(Head), _)), !.
classify_predicate(Head, _, imported) :-
	prolog_xbrowse:imported(Head), !.
classify_predicate(Head, Key, exported) :-
	x_browse_info(Key, export(Head)).
classify_predicate(Head, _, built_in) :-
	system_predicate(Head), !.
classify_predicate(Head, _, global) :-
	global_predicate(Head), !.
classify_predicate(Head, Key, incomplete) :-
	x_browse_info(Key, entity(unreferenced_call(Head, _), _)), !.
classify_predicate(Head, Key, unreferenced) :-
	x_browse_info(Key, entity(unreferenced_predicate(Head), _)), !.
classify_predicate(Head, Key, undefined) :-
	x_browse_info(Key, entity(unreferenced_call(_, To), _)),
	memberchk(Head, To), !.
classify_predicate(Head, _Key, fact) :-
	\+ prolog_xbrowse:called(_, Head), !.
classify_predicate(_, _, local).

expand(P) :->
	get(P, file_id, Key),
	get(P, head, Head),
	get(P, window, TocWindow),
	(   prolog_xbrowse:called(Called, Head),
	    make_file_toc_entry(predicate(Called), Key, TE),
	    send(TocWindow, son, P, TE),
	    send(TE, slot, file_id, Key),
	    predicate_location(Key, Called, Line),
	    send(TE, slot, line, Line),
	    fail
	;   true
	).

predicate_location(K, Called, Line) :-
	x_browse_info(K, entity(predicate(Called), Line)), !.
predicate_location(K, Called, Line) :-
	x_browse_info(K, entity(dynamic(Called), Line)), !.
predicate_location(K, Called, Line) :-
	x_browse_info(K, entity(grammar_rule(Called), Line)), !.
predicate_location(K, Called, Line) :-
	x_browse_info(K, entity(xpce_class_local_predicate(_, Called), Line)), !.

identify(P) :->
	"Identify myself as status"::
	get(P, classification, Class),
	get(P, name, Name),
	get(P, arity, Arity),
	identify_predicate(Class, Name/Arity, P).

identify_predicate(fact, Name/Arity, P) :-
	send(P, report, status,
	     'Unit-clause predicate %s/%d', Name, Arity).
identify_predicate(Class, Name/Arity, P) :-
	send(P, report, status,
	     '%s predicate %s/%d', Class?label_name, Name, Arity).

open(P) :->
	"Edit, manual or expand"::
	(   send(P, has_source)
	->  send(P, edit)
	;   send(P, has_manual)
	->  send(P, manual)
	;   send_super(P, open)
	).

manual(P) :->
	get(P, name, Name),
	get(P, arity, Arity),
	(   help(Name/Arity)
	->  true
	;   send(P, report, warning, 'No help for %s/%d', Name, Arity)
	).

has_manual(P) :->
	"Succeed if there is a manual-page"::
	get(P, name, Name),
	get(P, arity, Arity),
	predicate(Name, Arity, _, _, _).

built_in(P) :->
	"True is represented predicate is builtin"::
	get(P, head, Head),
	system_predicate(Head).

loaded(P) :->
	"Test if represented predicate is loaded"::
	get(P, file_node, Node),
	send(Node, loaded).

spy(P, Val:[bool]) :->
	"Switch spying on/off"::
	get(P, head, @on, Head),
	(   Val == @off
	->  nospy(Head)
	;   spy(Head)
	).

trace(P, Val:[bool]) :->
	"Switch tracing on/off"::
	get(P, head, @on, Head),
	(   Val == @off
	->  trace(Head, -all)
	;   trace(Head)
	).

:- free(@prolog_predicate_popup).
:- pce_global(@prolog_predicate_popup,
	      make_prolog_predicate_popup).

make_prolog_predicate_popup(P) :-
	new(P, popup(predicate_options)),

	send_list(P, append,
		  [ menu_item(edit,
			      message(@arg1, open),
			      condition := message(@arg1, has_source)),
		    menu_item(spy,
			      message(@arg1, spy),
			      condition := message(@arg1, loaded)),
		    menu_item(trace,
			      message(@arg1, trace),
			      condition := message(@arg1, loaded)),
		    menu_item(manual,
			      message(@arg1, manual),
			      condition := message(@arg1, has_manual))
		  ]).

popup(_, Popup:popup) :<-
	Popup = @prolog_predicate_popup.

:- pce_end_class(sb_predicate).


image(module,		open,		'openmodule.xpm').
image(module,		closed,		'module.xpm').

image(dynamic,		open,		'mini-run.xpm').
image(dynamic,		closed,		'mini-run.xpm').

image(predicate,	built_in,	'builtin.xpm').
image(predicate,	global,		'mini-globe.xpm').
image(predicate,	dynamic,	'mini-run.xpm').
image(predicate,	imported,	'import.xpm').
image(predicate,	exported,	'export.xpm').
image(predicate,	incomplete,	'warnpred.xpm').
image(predicate,	unreferenced,	'unrefpred.xpm').
image(predicate,	undefined,	'undefpred.xpm').
image(predicate,	fact,		'fact.xpm').
image(predicate,	local,		'pred.xpm').
image(predicate,	dcg,		'grammar.xpm').



		 /*******************************
		 *	       HOOK		*
		 *******************************/

:- multifile
	user:message_hook/3.

image_of_load_state(start,	'loading.xpm').
image_of_load_state(true,	'plloadedfile.xpm').
image_of_load_state(false,	'loadfailed.xpm').

user:message_hook(load_file(What), _Kind, _Lines) :-
	load_info(What, File, Stage),
	prolog_overview_window(Win),
	(   file_name_extension(_, qlf, File)
	->  debug('Looking for ~q~n', [File]),
	    '$qlf_info'(File, V, V, _WordSize, Sources),
	    debug('Contains ~q~n', [Sources]),
	    member(TheFile, Sources)
	;   TheFile = File
	),
	get(Win, file_node, TheFile, Node),
	image_of_load_state(Stage, Img),
	send(Node, image, Img),
	send(Node, flush),
	fail.

load_info(start(_Level, file(_, Path)),
	  Path, start).
load_info(failed(Spec),
	  Path, false) :-
	absolute_file_name(Spec,
			   [ file_type(prolog),
			     access(read)
			   ],
			   Path).
load_info(done(_Level, file(_, Path), _, _, _, _),
	  Path, true).

