package interactive; # $Id: interactive.pm 247292 2008-10-01 15:23:37Z tv $

use diagnostics;
use strict;

#-######################################################################################
#- misc imports
#-######################################################################################
use common;
use do_pkgs;

=head1 NAME

interactive - a GUI layer with multiple backend (text console, Gtk+ GUI, web)

=head1 SYNOPSYS

B<interactive> enables to write GUIes that will work everywhere:

=head1 Functions

=over 4

=item * text console

implemented by L<interactive::stdio> & L<interactive::curses>

=item * web browser

implemented by L<interactive::http>

=item * GUI

implemented by L<interactive::gtk>

=back

Interactive inherits from L<do_pkgs> and thus $in->do_pkgs will return
an usable C<do_pkgs> object suitable for installing packages.

=head1 Minimal example using interactive

 use lib qw(/usr/lib/libDrakX);
 use interactive;
 my $in = interactive->vnew;
 $in->ask_okcancel('title', 'question');
 $in->exit;

=head1 Backends

heritate from this class and you'll get all made interactivity for same steps.
for this you need to provide

C<ask_from_listW(o, title, messages, arrayref, default)> which returns one string of arrayref

where:

=over 4

=item * B<o> is the object

=item * B<title> is a string

=item * B<messages> is an refarray of strings

=item * B<default> is an optional string (default is in arrayref)

=item * B<arrayref> is an arrayref of strings

=item * B<arrayref>2 contains booleans telling the default state,

=back

=head1 Functions

=over

=cut

#-######################################################################################
#- OO Stuff
#-######################################################################################
our @ISA = qw(do_pkgs);

sub new($) {
    my ($type) = @_;

    bless {}, ref($type) || $type;
}

sub vnew {
    my ($_type, $o_su, $o_icon) = @_;
    my $su = $o_su eq "su";
    if ($ENV{INTERACTIVE_HTTP}) {
	require interactive::http;
	return interactive::http->new;
    }
    require c;
    if ($su) {
	$ENV{PATH} = "/sbin:/usr/sbin:$ENV{PATH}";
	$su = '' if $::testing || $ENV{TESTING};
    }
    require_root_capability() if $su;
    if (check_for_xserver()) {
	eval { require interactive::gtk };
	if (!$@) {
	    my $o = interactive::gtk->new;
	    if ($o_icon && $o_icon ne 'default' && !$::isWizard) { $o->{icon} = $o_icon } else { undef $o->{icon} }
	    return $o;
	} elsif ($::testing) {
	    die;
	}
    }

    require interactive::curses;
    interactive::curses->new;
}

sub ok { N_("Ok") }
sub cancel { N_("Cancel") }

sub markup_parse {
    my ($s) = @_;
    my @l;
    my @attrs;

    while ($s) {
	if ($s =~ s!^<(\w+)(\s+[^>]*?)?>!!s) {
	    push @attrs, [ $1, $2 ];
	} elsif ($s =~ s!^</(\w+)>!!) {
	    my $previous = pop @attrs;
	    $previous->[0] eq $1 or return;
	} elsif ($s =~ s!^(&(amp|lt|gt);)!!) {
	    push @l, [ $1, @attrs ];
	} elsif ($s =~ s!^([^<>&]+)!!s) {
	    push @l, [ $1, @attrs ];
	} else {
	    return;
	}
    }
    markup_simplify(\@l);
    \@l;
}

sub markup_simplify {
    my ($l) = @_;
    foreach (@$l) {
	my ($s, @attrs) = @$_;
	my %attrs = map {
	    my ($tag, $attrs) = @$_;
	    my $long = { b => { weight => "bold" },
			 i => { style => "italic" },
			 big => { size => 'larger' },
		      }->{$tag};   
	    $long ? %$long : map { /^(.*?)=['"]?(.*?)['"]?$/ } split(' ', $attrs);
	} @attrs;

	$s = +{ '&amp;' => '&', '&lt;' => '<', '&gt;' => '>' }->{$s} || $s;

	@$_ = ($s, if_(%attrs, \%attrs));
    }
}

sub markup_remove {
    my ($s) = @_;
    if (my $l = markup_parse($s)) {
	join('', map { $_->[0] } @$l);
    } else {
	$s;
    }
}

#- drop markup as fallback
sub adapt_markup {
    my ($_o, $s) = @_;
    markup_remove($s);
}

sub enter_console {}
sub leave_console {}
sub suspend {}
sub resume {}
sub end {}
sub exit {
    if ($::isStandalone) {
        require standalone;
        standalone::exit($_[0]);
    } else {
        exit($_[0]);
    }
}


#-######################################################################################
#- Interactive functions
#-######################################################################################
sub ask_warn {
    my ($o, $title, $message, $o_icon) = @_;
    ask_warn_($o, { title => $title, messages => $message, icon => $o_icon });
}
sub ask_yesorno {
    my ($o, $title, $message, $b_def) = @_;
    ask_yesorno_($o, { title => $title, messages => $message }, $b_def);
}
sub ask_okcancel {
    my ($o, $title, $message, $b_def, $o_icon) = @_;
    ask_okcancel_($o, { title => $title, messages => $message, icon => $o_icon }, $b_def);
}

sub ask_warn_ {
    my ($o, $common) = @_;
    local $o->{modal} = $o->{modal} || $::isInstall; # make these popup at install time
    ask_from_listf_raw_no_check($o, $common, \&translate, [ $o->ok ]);
}

sub ask_yesorno_ {
    my ($o, $common, $b_def) = @_;
    $common->{cancel} = '';
    ask_from_listf_raw($o, $common, \&translate, [ N_("Yes"), N_("No") ], $b_def ? "Yes" : "No") eq "Yes";
}

sub ask_okcancel_ {
    my ($o, $common, $b_def) = @_;

    if ($::isWizard) {
	$common->{focus_cancel} = !$b_def;
    	ask_from_no_check($o, $common, []);
    } else {
	ask_from_listf_raw($o, $common, \&translate, [ $o->ok, $o->cancel ], $b_def ? $o->ok : $o->cancel) eq $o->ok;
    }
}

sub ask_filename {
    my ($o, $common) = @_;
    $common->{want_a_dir} = 0;
    $o->ask_fileW($common);
}

sub ask_directory {
    my ($o, $common) = @_;
    $common->{want_a_dir} = 1;
    $o->ask_fileW($common);
}

#- predecated
sub ask_file {
    my ($o, $title, $o_dir) = @_;
    $o->ask_fileW({ title => $title, want_a_dir => 0, directory => $o_dir });
}

sub ask_fileW {
    my ($o, $common) = @_;
    $o->ask_from_entry($common->{title}, $common->{message} || N("Choose a file"));
}

=item ask_from_list($o, $title, $message, $l, $o_def)

=item ask_from_list_($o, $title, $message, $l, $o_def)

ask_from_list() and ask_from_list_() are wrappers around ask_from_biglist and ask_from_smalllist

ask_from_list_() just translate arrayref before calling ask_from_list and untranslate the result

ask_from_listW() should handle differently small lists and big ones.

=cut

sub ask_from_list {
    my ($o, $title, $message, $l, $o_def) = @_;
    ask_from_listf($o, $title, $message, undef, $l, $o_def);
}

sub ask_from_list_ {
    my ($o, $title, $message, $l, $o_def) = @_;
    ask_from_listf($o, $title, $message, \&translate, $l, $o_def);
}

sub ask_from_listf_ {
    my ($o, $title, $message, $f, $l, $o_def) = @_;
    ask_from_listf($o, $title, $message, sub { translate($f->(@_)) }, $l, $o_def);
}
sub ask_from_listf {
    my ($o, $title, $message, $f, $l, $o_def) = @_;
    ask_from_listf_raw($o, { title => $title, messages => $message }, $f, $l, $o_def);
}
sub ask_from_listf_raw {
    my ($_o, $_common, $_f, $l, $_o_def) = @_;
    @$l == 0 and die "ask_from_list: empty list\n" . backtrace();
    @$l == 1 and return $l->[0];
    goto &ask_from_listf_raw_no_check;
}

sub ask_from_listf_raw_no_check {
    my ($o, $common, $f, $l, $o_def) = @_;

    if (@$l <= ($::isWizard ? 1 : 2)) {
	my ($ok, $cancel) = map { $_ && may_apply($f, $_) } @$l;
	if (length "$ok$cancel" < 70) {
	    my $ret = eval {
		put_in_hash($common, { ok => $ok, 
				       if_($cancel, cancel => $cancel, focus_cancel => $o_def eq $l->[1]) });
		ask_from_no_check($o, $common, []) ? $l->[0] : $l->[1];
	    };
	    die if $@ && $@ !~ /^wizcancel/;
	    return $@ ? undef : $ret;
	}
    }
    ask_from_no_check($o, $common, [ { val => \$o_def, type => 'list', list => $l, format => $f } ]) && $o_def;
}

sub ask_from_treelist {
    my ($o, $title, $message, $separator, $l, $o_def) = @_;
    ask_from_treelistf($o, $title, $message, $separator, undef, $l, $o_def);
}
sub ask_from_treelist_ {
    my ($o, $title, $message, $separator, $l, $o_def) = @_;
    my $transl = sub { join '|', map { translate($_) } split(quotemeta($separator), $_[0]) }; 
    ask_from_treelistf($o, $title, $message, $separator, $transl, $l, $o_def);
}
sub ask_from_treelistf {
    my ($o, $title, $message, $separator, $f, $l, $o_def) = @_;
    ask_from($o, $title, $message, [ { val => \$o_def, separator => $separator, list => $l, format => $f, sort => 1 } ]) or return;
    $o_def;
}

sub ask_many_from_list {
    my ($o, $title, $message, @l) = @_;
    @l = grep { @{$_->{list}} } @l or return '';
    foreach my $h (@l) {
	$h->{e}{$_} = {
	    text => may_apply($h->{label}, $_),
	    val => $h->{val} ? $h->{val}->($_) : do {
		my $i =
		  $h->{value} ? $h->{value}->($_) : 
		    $h->{values} ? member($_, @{$h->{values}}) : 0;
		\$i;
	    },
	    type => 'bool',
	    help => may_apply($h->{help}, $_, ''),
	    icon => may_apply($h->{icon2f}, $_, ''),
	} foreach @{$h->{list}};
	if ($h->{sort}) {
	    $h->{list} = [ sort { $h->{e}{$a}{text} cmp $h->{e}{$b}{text} } @{$h->{list}} ];
	}
    }
    $o->ask_from($title, $message, [ map { my $h = $_; map { $h->{e}{$_} } @{$h->{list}} } @l ]) or return;

    @l = map {
	my $h = $_;
	[ grep { ${$h->{e}{$_}{val}} } @{$h->{list}} ];
    } @l;
    wantarray() ? @l : $l[0];
}

sub ask_from_entry {
    my ($o, $title, $message, %callback) = @_;
    first(ask_from_entries($o, $title, $message, [''], %callback));
}
sub ask_from_entries {
    my ($o, $title, $message, $l, %callback) = @_;

    my @l = map { my $i = ''; { label => $_, val => \$i } } @$l;

    $o->ask_from_({ title => $title, messages => $message, %callback, 
		    focus_first => 1 }, \@l) or return;
    map { ${$_->{val}} } @l;
}

sub ask_from__add_modify_remove {
    my ($o, $title, $message, $l, %callback) = @_;
    die "ask_from__add_modify_remove only handles one item" if @$l != 1;

    $callback{$_} or internal_error("missing callback $_") foreach qw(Add Modify Remove);

    if ($o->can('ask_from__add_modify_removeW')) {
	$o->ask_from__add_modify_removeW($title, $message, $l, %callback);
    } else {
	my $e = $l->[0];
	my $chosen_element;
	put_in_hash($e, { allow_empty_list => 1, val => \$chosen_element, type => 'list' });

	while (1) {
	    my $continue;
	    my @l = (@$l, 
		     map { my $s = $_; { val => translate($_), clicked_may_quit => sub { 
					     my $r = $callback{$s}->($chosen_element);
					     defined $r or return;
					     $continue = 1;
					 } } }
		     N_("Add"), if_(@{$e->{list}} > 0, N_("Modify"), N_("Remove")));
	    $o->ask_from_({ title => $title, messages => $message, %callback }, \@l) or return;
	    return 1 if !$continue;
	}
    }
}


#- can get a hash of callback: validate
#- moreove if you pass a hash with a field list -> combo
#- if you pass a hash with a field hidden -> emulate stty -echo
sub ask_from {
    my ($o, $title, $message, $l, %callback) = @_;
    ask_from_($o, { title => $title, messages => $message, %callback }, $l);
}


sub _normalize_entry {
    my ($o, $e) = @_;

    if (my $li = $e->{list}) {
	ref($e->{val}) =~ /SCALAR|REF/ or internal_error($e->{val} ? "field {val} must be a reference (it is $e->{val})" : "field {val} is mandatory");	#-#
	if ($e->{sort} || @$li > 10 && !exists $e->{sort}) {
	    my @l2 = map { may_apply($e->{format}, $_) } @$li;
	    my @places = sort { $l2[$a] cmp $l2[$b] } 0 .. $#l2;
	    $e->{list} = $li = [ map { $li->[$_] } @places ];
	}
	$e->{type} = 'iconlist' if $e->{icon2f};
	$e->{type} = 'treelist' if $e->{separator} && $e->{type} ne 'combo';
	add2hash_($e, { not_edit => 1 });
	$e->{type} ||= 'combo';

	if (!$e->{not_edit}) {
	    die q(when using "not_edit" you must use strings, not a data structure) if ref(${$e->{val}}) || any { ref $_ } @$li;
	}
	if ($e->{type} ne 'combo' || $e->{not_edit}) {
	    ${$e->{val}} = $li->[0] if !member(may_apply($e->{format}, ${$e->{val}}), map { may_apply($e->{format}, $_) } @$li);
	}
    } elsif ($e->{type} eq 'range') {
	$e->{min} <= $e->{max} or die "bad range min $e->{min} > max $e->{max} (called from " . join(':', caller()) . ")";
	${$e->{val}} = max($e->{min}, min(${$e->{val}}, $e->{max}));
    } elsif ($e->{type} eq 'button' || $e->{clicked} || $e->{clicked_may_quit}) {
	$e->{type} = 'button';
	$e->{clicked_may_quit} ||= $e->{clicked} ? sub { $e->{clicked}(); 0 } : sub {};	    
	$e->{val} = \ (my $_v = $e->{val}) if !ref($e->{val});
    } elsif (!$e->{type} && !$e->{val}) {
	$e->{type} = 'only_label';
	$e->{val} = \ (my $_v = $o->adapt_markup(delete $e->{label}));
    } elsif ($e->{type} eq 'label' || !ref($e->{val})) {
	$e->{type} = 'label';
	$e->{val} = \ (my $_v = $e->{val}) if !ref($e->{val});
    } elsif ($e->{type} eq 'expander') {
	_normalize_entries($o, $e->{children});
    } else {
	$e->{type} ||= 'entry';
    }
    $e->{label} = $o->adapt_markup($e->{label}) if $e->{label};
}

sub _normalize_entries {
    my ($o, $l) = @_;

    ref($l) eq 'ARRAY' or internal_error('ask_from_normalize');

    _normalize_entry($o, $_) foreach @$l;

    #- do not display empty lists and one element lists
    @$l = grep { 
	if ($_->{list} && $_->{not_edit} && !$_->{allow_empty_list}) {
	    if (!@{$_->{list}}) {
		eval {
		    require 'log.pm'; #- "require log" causes some pb, perl thinking that "log" is the log() function
		    log::l("ask_from_normalize: empty list for $_->{label}\n" . backtrace());
		};
	    }
	    @{$_->{list}} > 1;
	} else {
	    1;
	}
    } @$l;
}

sub ask_from_normalize {
    my ($o, $common, $l) = @_;

    if ($common->{focus_first}) {
	if (my $e = find { $_->{val} } @$l) {
	    $e->{focus} = sub { 1 };
	}
    }

    _normalize_entries($o, $l);

    if (!$common->{title} && $::isStandalone) {
	($common->{title} = $0) =~ s|.*/||;
    }
    $common->{interactive_help} ||= $o->{interactive_help};
    $common->{interactive_help} ||= $common->{interactive_help_id} && $o->interactive_help_sub_get_id($common->{interactive_help_id});
    if (!$::isInstall) {
        delete $common->{$_} foreach qw(interactive_help interactive_help_id);
    }
    $common->{advanced_label} ||= N("Advanced");
    $common->{advanced_label_close} and log::l("advanced_label_close is not used anymore");
    $common->{$_} = $common->{$_} ? [ map { $o->adapt_markup($_) } deref($common->{$_}) ] : [] 
      foreach qw(messages advanced_messages);

    if ($common->{callbacks}) {
	$common->{callbacks}{changed} and internal_error(q(global "changed" callback is not handled anymore, use a per-entry changed callback));
	$common->{callbacks}{focus_out} and internal_error(q(global "focus_out" callback is not handled anymore, use a per-entry focus_out callback));
	add2hash($common, delete $common->{callbacks});
    }
    if (my $complete = delete $common->{complete}) {
	$common->{validate} = sub { !first($complete->()) };
    }
    add2hash_($common, { validate => sub { 1 } });
}

sub migrate_advanced {
    my ($common, $l) = @_;
    my ($l1, $l2) = partition { !$_->{advanced} } @$l;
    my $advanced_message = join("\n", @{$common->{advanced_messages}});
    [ @$l1, if_(@$l2, { type => 'expander', 
			if_($advanced_message, message => $advanced_message),
			text => $common->{advanced_label},
			expanded => $common->{advanced_state},
			children => $l2,
		    }) ];
}


=item ask_from_($o, $common, $l)

ask_from_() takes global options ($common):

=over 4

=item * B<title>: window title

=item * B<messages>: message displayed in the upper part of the window

=item * B<ok>: force the name of the "Ok"/"Next" button

=item * B<cancel>: force the name of the "Cancel"/"Previous" button

=item * B<focus_cancel>: force focus on the "Cancel" button

=item * I<focus_first>: (deprecated) force focus on the first entry

=item * B<ok_disabled>: function returning whether {ok} should be disabled (grayed)

=item * B<validate>: function called when {ok} is pressed. If it returns false, the first entry is focused, otherwise it quits

=item * I<advanced>: (deprecated) function called when the "advanced" expander is toggled

=item * I<advanced_messages>: (deprecated) message displayed when "Advanced" is pressed

=item * I<advanced_label>: (deprecated) force the name of the "Advanced" button

=item * I<advanced_label_close>: (deprecated) force the name of the "Basic" button

=item * I<advanced_state>: (deprecated) if set to 1, force the "Advanced" part of the dialog to be opened initially

=item * I<advanced_title>: title of the advanced item popup dialog (else reusing main title)

=item * I<callbacks>: (deprecated) functions called when something happen: complete advanced ok_disabled

=back

ask_from_ takes a list of entries with fields:

=over 4

=item * B<val>: reference to the value

=item * B<label>: description

=item * B<title>: a boolean: whether the label should be displayed as a title (see GNOME's HIG)

=item * B<icon>: icon to put before the description

=item * B<help>: tooltip

=item * I<advanced>: (deprecated) whether it is shown in by default or only in advanced mode

=item * B<focus_out>: function called when the entry is focused out

=item * B<changed>: function called when the entry is modified

=item * B<validate>: function called when "Ok" is pressed. If it returns false, this entry is focused, otherwise it quits

=item * B<disabled>: function returning whether it should be disabled (grayed)

=item * B<focus>: function returning whether it should be focused

=item * B<alignment>: preferred alignment

=item * B<do_not_expand>: do not eat all horizontal space

=item * B<install_button>: if possible, use improved graphical style

=item * B<gtk>: gtk preferences

=item * B<type>:

=over 4

=item * B<button>: (with clicked or clicked_may_quit)

I<type> defaults to button if clicked or clicked_may_quit is there.
I<val> need not be a reference.
If I<clicked_may_quit> return true, it's as if "Ok" was pressed.

=item * B<label>:
I<val> need not be a reference.
I<type> defaults to label if val is not a reference.

=item * B<bool>: (with "text" or "image" (which overrides text) giving an image filename)

=item * B<range>: (with min, max, SpinButton)

=item * B<combo>: (with list, not_edit, format)

=item * B<list>: (with list, icon2f (aka icon), separator (aka tree), format (aka pre_format function),

It has these optional parameters:

=over 4

=item * B<help>: can be a hash or a function,

=item * B<tree_expanded>: boolean telling whether the tree should be wide open by default

=item * B<quit_if_double_click>: boolean

=item * B<allow_empty_list>: disables the special cases for 0 and 1 element lists

=item * B<image2f>: a subroutine which takes a value of the list as parameter, and returns image_file_name

=back

=item * B<entry>: (the default) (with hidden)

=item * B<expander>: (with text, expanded, message, children(a list of sub entries))

=back

=back

=cut


sub ask_from_ {
    my ($o, $common, $l) = @_;
    ask_from_normalize($o, $common, $l);
    @$l or return 1;
    $common->{cancel} = '' if !defined wantarray();
    ask_from_real($o, $common, $l);
}
sub ask_from_no_check {
    my ($o, $common, $l) = @_;
    ask_from_normalize($o, $common, $l);
    $common->{cancel} = '' if !defined wantarray();
    my $l_ = migrate_advanced($common, $l);
    $o->ask_fromW($common, $l_);
}
sub ask_from_real {
    my ($o, $common, $l) = @_;
    my $l_ = migrate_advanced($common, $l);
    my $v = $o->ask_fromW($common, $l_);

    foreach my $e (@$l) {
	if ($e->{type} eq 'range') {
	    ${$e->{val}} = max($e->{min}, min(${$e->{val}}, $e->{max}));
	}
    }

    %$common = ();
    $v;
}


sub ask_browse_tree_info {
    my ($o, $title, $message, $common) = @_;
    $common->{interactive_help} ||= $common->{interactive_help_id} && $o->interactive_help_sub_get_id($common->{interactive_help_id});
    add2hash_($common, { ok => $::isWizard ? ($::Wizard_finished ? N("Finish") : N("Next")) : N("Ok"), 
			 cancel => $::isWizard ? N("Previous") : N("Cancel") });
    add2hash_($common, { title => $title, message => $message });
    add2hash_($common, { grep_allowed_to_toggle      => sub { @_ },
			 grep_unselected             => sub { grep { $common->{node_state}($_) eq 'unselected' } @_ },
			 check_interactive_to_toggle => sub { 1 },
			 toggle_nodes                => sub {
			     my ($set_state, @nodes) = @_;
			     my $new_state = !$common->{grep_unselected}($nodes[0]) ? 'selected' : 'unselected';
			     $set_state->($_, $new_state) foreach @nodes;
			 },
		       });
    $o->ask_browse_tree_info_refW($common);
}
sub ask_browse_tree_info_refW { #- default definition, do not use with too many items (memory consuming)
    my ($o, $common) = @_;
    my ($l, $v, $h) = ([], [], {});
    $common->{build_tree}(sub {
			      my ($node) = $common->{grep_allowed_to_toggle}(@_);
			      if (my $state = $node && $common->{node_state}($node)) {
				  push @$l, $node;
				  $state eq 'selected' and push @$v, $node;
				  $h->{$node} = $state eq 'selected';
			      }
			  }, 'flat');
    add2hash_($common, { list   => $l, #- TODO interactivity of toggle is missing
			 values => $v,
			 help   => sub { $common->{get_info}($_[0]) },
		       });
    my ($new_v) = $o->ask_many_from_list($common->{title}, $common->{message}, $common) or return;
    $common->{toggle_nodes}(sub {}, grep { ! delete $h->{$_} } @$new_v);
    $common->{toggle_nodes}(sub {}, grep { $h->{$_} } keys %$h);
    1;
}

sub wait_message {
    my ($o, $title, $message, $b_temp) = @_;
    my $inline_title = $::isInstall ? $title : '';
    $inline_title ||= N("Please wait");

    my $w = $o->wait_messageW($title, $inline_title, $message);
    push @tempory::objects, $w if $b_temp;
    my $b = before_leaving { $o->wait_message_endW($w) };

    #- enable access through set
    MDK::Common::Func::add_f4before_leaving(sub { $o->wait_message_nextW($_[1], $w) }, $b, 'set');
    $b;
}


sub wait_message_with_progress_bar {
    my ($in, $o_title) = @_;

    my $w = $in->wait_message($o_title, '');
    my $last_msg;
    $w, sub {
	my ($msg, $current, $total) = @_;
	if ($msg) {
	    $w->set($last_msg = $msg);
	}
	if ($total) {
	    $w or internal_error('You must first give some text to display');
	    $w->set(join("\n", $last_msg, "$current / $total"));
	}
    };
}

sub kill() {}



sub helper_separator_tree_to_tree {
    my ($separator, $list, $formatted_list) = @_;
    my $sep = quotemeta $separator;
    my $tree = {};
    
    each_index {
	my @l = split $sep;
	my $leaf = pop @l;
	my $node = $tree;
	foreach (@l) {
	    $node = $node->{$_} ||= do {
		my $r = {};
		push @{$node->{_order_}}, $_;
		$r;
	    };
	}
	push @{$node->{_leaves_}}, [ $leaf, $list->[$::i] ];
	();
    } @$formatted_list;

    $tree;
}


sub interactive_help_sub_get_id {
    my ($o, $id) = @_;
    eval { $o->is_help_file_exist($id) }
      && sub { $o->interactive_help_get_id($id) };
}

sub interactive_help_sub_display_id {
    my ($o, $id) = @_;
    eval { $o->interactive_help_has_id($id) }
      && sub { $o->ask_warn(N("Help"), $o->interactive_help_get_id($id)) };
}

=back

=cut

1;