User:AnomieBOT/source/tasks/TFDClerk.pm

From Wikipedia, the free encyclopedia
package tasks::TFDClerk;

=pod

=begin metadata

Bot:     AnomieBOT
Task:    TFDClerk
BRFA:    Wikipedia:Bots/Requests for approval/AnomieBOT 59
Status:  Approved 2011-11-08
Created: 2011-10-30

Peform the following tasks at [[WP:TFD]]:
* Create the daily TFD subpage.
* Fix the headers on the daily TFD subpages, if they get removed or damaged.
* Maintain the page [[Wikipedia:Templates for discussion/Old unclosed discussions]].
* Subst {{tl|tfd top}} and {{tl|tfd bottom}}, when editing the page anyway.

=end metadata

=cut

use utf8;
use strict;

use AnomieBOT::Task qw/:time/;
use Data::Dumper;
use vars qw/@ISA/;
@ISA=qw/AnomieBOT::Task/;

my @months=('','January','February','March','April','May','June','July','August','September','October','November','December');
my $is_closed_re=qr((?:\{\{\s*tfd[_ ]?top\s*[|}]|<div class="[^"]*(?<=[" ])[tx]fd-closed[ "]));

my %db=(
    nonsense       => 'G1',
    test           => 'G2',
    vandalism      => 'G3',
    pagemove       => 'G3',
    hoax           => 'G3',
    repost         => 'G4',
    banned         => 'G5',
    histmerge      => 'G6',
    move           => 'G6',
    copypaste      => 'G6',
    xfd            => 'G6',
    maintenance    => 'G6',
    house          => 'G6',
    disambig       => 'G6',
    movedab        => 'G6',
    unpatrolled    => 'G6',
    author         => 'G7',
    self           => 'G7',
    blanked        => 'G7',
    talk           => 'G8',
    subpage        => 'G8',
    imagepage      => 'G8',
    redirnone      => 'G8',
    templatecat    => 'G8',
    attack         => 'G10',
    blp            => 'G10',
    attackorg      => 'G10',
    spam           => 'G11',
    promo          => 'G11',
    copyvio        => 'G12',
    policy         => 'T2',
    misrepresentation => 'T2',
    misrepresent   => 'T2',
    fake           => 'T2',
    't3-s'         => 'T3',
    duplicatetemplate  => 'T3',
    duplicate      => 'T3',
);

sub new {
    my $class=shift;
    my $self=$class->SUPER::new();
    $self->{'lasttime'}=0;
    $self->{'broken'}=0;
    bless $self, $class;
    return $self;
}

=pod

=for info
Approved 2011-11-08<br />[[Wikipedia:Bots/Requests for approval/AnomieBOT 59]]

=cut

sub approved {
    return 2;
}

sub run {
    my ($self, $api)=@_;
    my $res;

    $api->task('TFDClerk', 0, 10, qw/d::Talk d::Templates d::Redirects d::Sections/);

    my %p=$api->redirects_to_resolved('Template:Delrevxfd');
    if(exists($p{''})){
        if($p{''}{'code'} eq 'shutoff'){
            $api->warn("Task disabled: ".$p{''}{'content'}."\n");
            return 300;
        }
        $api->warn("Failed to get notice template redirects: ".$p{''}{'error'}."\n");
        return 60;
    }
    my @p=map { s/^Template://; my ($a,$b)=split(//,$_,2); "(?i:\Q$a\E)\Q$b\E"; } keys %p;
    my $p=join('|',@p);
    my $noticere=qr/(?:(?i:<noinclude>\s*)?\{\{\s*(?i:Template\s*:\s*)?(?:$p)\s*(?:\|.*?)?\}\}\s*(?i:<\/noinclude>\s*)?)/;

    my %tosubst=$api->redirects_to_resolved('Template:Tfd top', 'Template:Tfd bottom');
    if(exists($tosubst{''})){
        if($tosubst{''}{'code'} eq 'shutoff'){
            $api->warn("Task disabled: ".$tosubst{''}{'content'}."\n");
            return 300;
        }
        $api->warn("Failed to get top/bottom template redirects: ".$tosubst{''}{'error'}."\n");
        return 60;
    }

    my %tfdlinks=$api->redirects_to_resolved('Template:Tfd links');
    if(exists($tfdlinks{''})){
        if($tfdlinks{''}{'code'} eq 'shutoff'){
            $api->warn("Task disabled: ".$tfdlinks{''}{'content'}."\n");
            return 300;
        }
        $api->warn("Failed to get {{tfd links}} redirects: ".$tfdlinks{''}{'error'}."\n");
        return 60;
    }

    # Only check once per hour
    if($self->{'lasttime'}==0){
        if(exists($api->store->{'lasttime'})){
            my $t=$api->store->{'lasttime'};
            $self->{'lasttime'}=$t if($t=~/^\d+$/ && $t<=time());
        }
        $self->{'broken'}=$api->store->{'broken'} if(exists($api->store->{'broken'}));
    }
    my $starttime=time();
    my $t=$self->{'lasttime'}+($self->{'broken'}?300:3600)-$starttime;
    return $t if $t>0;
    # If it's close enough to 23:00, just wait for 23:00.
    $t=82800-($starttime%86400);
    return $t if($t>0 && $t<($self->{'broken'}?300:3600));
    # If it's close enough to 00:00, just wait for 00:00.
    $t=86400-($starttime%86400);
    return $t if($t>0 && $t<($self->{'broken'}?300:1800));

    my $startdate=[1,3,2018];
    $startdate=$api->store->{'startdate'} if exists($api->store->{'startdate'});

    my $screwup=' Errors? [[User:'.$api->user.'/shutoff/TFDClerk]]';

    # Get the content of all versions of "tfd top" since the startdate
    my $re='\{\{\s*[tT]fd[ _]?top\s*(?s:\|.*?)?\}\}';
    my %cont=();
    my $first=1;
    while($first || %cont) {
        my $t=$api->query(
            titles  => 'Template:tfd top',
            prop    => 'revisions',
            rvprop  => 'timestamp|content',
            rvslots => 'main',
            rvlimit => 1,
            %cont,
        );
        if($t->{'code'} ne 'success'){
            $api->warn("Failed to load revisions for Template:tfd top: ".$t->{'error'}."\n");
            return 60;
        }
        %cont=exists($t->{'query-continue'})?%{$t->{'query-continue'}{'revisions'}}:();
        $t=(values(%{$t->{'query'}{'pages'}}))[0]{'revisions'}[0];
        %cont=() if $t->{'timestamp'} lt sprintf("%04d-%02d-%02d", reverse @$startdate);
        $t=$t->{'slots'}{'main'}{'*'};
        $t=~s!<noinclude>.*</noinclude>!!gs;
        $t=~s!</?includeonly>!!g;
        $t=~s!\{\{\{1\|'''delete'''\.\}\}\}\{\{(?:safe)?subst:#ifeq:\{\{\{2\|\}\}\}\|y\|&nbsp;~~~~\}\}!\x07!g;
        unless($t =~ m/^\s*$is_closed_re/o){
            next unless $first;
            $api->whine("[[Template:Tfd top]] is broken", "Help! The template {{tl|tfd top}} is missing the \"is_closed\" regex, or this regex is not at the beginning of the template's output. To avoid confusion, I'm not going to process any TFDs until it's fixed or I'm fixed.");
            return 300;
        }
        if($t =~ m/\x07\s*$/){
            next unless $first;
            $api->whine("[[Template:Tfd top]] is broken", "Help! The template {{tl|tfd top}} does not end with some constant text, i.e. <nowiki>{{{1|}}}</nowiki> is at the very end of the template. To avoid confusion, I'm not going to process any TFDs until it's fixed or I'm fixed.");
            return 300;
        }
        if($t =~ m/\{\{\{/){
            next unless $first;
            $api->whine("[[Template:Tfd top]] is broken", "Help! The template {{tl|tfd top}} contains unknown parameters. To avoid confusion, I'm not going to process any TFDs until it's fixed or I'm fixed.");
            return 300;
        }
        $t=quotemeta($t);
        $t=~s/\\\x07/(?s:.*?)/g;
        $re.="|$t";
        $first = 0;
    }

    # Iterate over all our pages
    my $broken=0;
    my $new_start=_make_date();
    my $sevendays=_date_add(_make_date(),-7,0,0);
    my @old=();
    my @oldsumm=();
    my @oldlinks=();
    MAINLOOP: for(my $date=_make_date(time+3600); _cmp_date($startdate,$date)<=0; $date=_date_add($date,-1,0,0)){
        return 0 if $api->halting;
        my $title='Wikipedia:Templates for discussion/Log/'.$date->[2].' '.$months[$date->[1]].' '.$date->[0];

        $api->log("Checking TFDs in $title");
        my $tok=$api->edittoken($title);
        if($tok->{'code'} eq 'shutoff'){
            $api->warn("Task disabled: ".$tok->{'content'}."\n");
            return 300;
        }
        if($tok->{'code'} ne 'success'){
            $api->warn("Failed to get edit token for $title: ".$tok->{'error'}."\n");
            return 60;
        }
        my $intxt=$tok->{'revisions'}[0]{'slots'}{'main'}{'*'} // '';
        my $outtxt=$intxt;

        # Fix header if necessary
        my $fixedhead=0;
        my ($pageheader,$err)=_makepagehead($api,$title,$date);
        if ( ! defined( $pageheader ) ) {
            $api->warn("Failed to get page header for $title: $err\n");
            return 60;
        }
        if($outtxt!~/^\Q$pageheader\E/){
            my $dt=$months[$date->[1]].' '.$date->[0];
            my $dt2=$date->[2].' '.$months[$date->[1]].' '.$date->[0];
            my $oldtxt;
            do {
                $oldtxt=$outtxt;
                $outtxt=~s!^(?:|.*?\n)===\s*(?:\Q[[Wikipedia:Templates for discussion/Log/$dt2|$dt]]\E|\Q$dt\E)\s*===[^\n]*\n!!s;
                $outtxt=~s/^\s*\[\[\s*(?i:Category)\s*:\s*Non-talk pages that are automatically signed(?:\|.*?)?\]\].*?\n//;
                $outtxt=~s/^\s*<!--.*?-->\s*//s;
                $outtxt=~s/^\s*//;
            } while($oldtxt ne $outtxt);
            $outtxt="$pageheader\n$outtxt";
        }
        $fixedhead=($outtxt ne $intxt);

        # If the page has been edited in the last day, keep watching it in case
        # the last closing gets reverted.
        my $ts=ISO2timestamp($tok->{'revisions'}[0]{'timestamp'}) // time;
        $new_start=[@$date] if(time()-$ts<86400);

        # Fix any simple mispositioned headers: armor any good headers, then
        # fix any mispositioned ones, then unarmor.
        my ($marker, $i)=('', 0);
        do {
            $marker = "\x02--$i--\x03";
            $i++;
        } while($outtxt=~/$marker/);
        $outtxt=~s/(?:^|(?<=\n))((====+)[^=](?:.*[^=])?\2\s*?\n\s*$noticere*$is_closed_re)/$1$marker/go;
        my $fixed=($outtxt=~s/(?:^|(?<=\n))((?>$re).*\n)\s*((====+)[^=](?:.*[^=])?\3\s*?\n)/$2$1/go);
        $outtxt=~s/$marker//go;

        # Split into level-4+ sections, and check if each is closed
        my @sections=$api->split_sections($outtxt, "456");
        my $ct=0;
        my %tmpl=();
        my @secs=();
        my @closed=();
        my @pageoldlinks=();
        for(my $i=0; $i<@sections; $i++){
            my $s=$sections[$i];
            if($s->{'body'}=~m/^\s*$noticere*$is_closed_re/o){
                # Someone closed a section, so merge in all its subsections
                my $j;
                for($j=$i+1; $j<@sections && $sections[$j]->{'level'} > $s->{'level'}; $j++){}
                if($j>$i+1){
                    $s->{'body'}=~s/\s*$/\n\n/;
                    $s->{'body'}.=$api->join_sections(splice(@sections, $i+1, $j-$i-1));
                }
            }

            $_=$s->{'body'};

            # Check manual closes
            my $bad=/(?>^\s*$noticere*\S).*$is_closed_re/so;
            next if !$bad && m/^\s*$noticere*$is_closed_re/o;
            if($bad || /$is_closed_re/so){
                $api->log("Crap, $title is b0rken");
                $api->warn("Crap, $title is b0rken\n");
                $api->whine("[[$title]] is broken", "Help! A section in [[$title]] contains the \"is_closed\" regex but not at the beginning of the section. Probably someone put the {{tl|tfd top}} before a section header instead of after. Anyway, I can't do anything to that page until someone fixes it.");
                if(_cmp_date($date,$sevendays)<0){
                    push @old, "{{$title}}\n";
                    unshift @oldsumm, [@$date];
                    push @oldlinks, "* <b>[[$title]] is broken</b>\n";
                }
                $new_start=[@$date];
                $broken=1;
                next MAINLOOP;
            }

            # Check for bot-closability
            my @templates=();
            $api->process_templates($_, sub {
                my $name=shift;
                my $params=shift;
                my $ns = 'Template';
                my $tpl = undef;

                return undef unless exists($tfdlinks{"Template:$name"});
                for my $p ($api->process_paramlist(@$params)){
                    $tpl = $p->{'value'} if $p->{'name'} eq '1';
                    $ns = 'Module' if ( $p->{'name'} eq 'module' && $p->{'value'} ne '' );
                    $ns = 'Category' if ( $p->{'name'} eq 'catfd' && $p->{'value'} ne '' );
                }
                push @templates, "$ns:$tpl" if defined( $tpl );
                return undef;
            });
            unless ( @templates ) {
                if ( $s->{'level'} ) {
                    push @pageoldlinks, "* [[$title#{{anchorencode:" . $s->{'title'} . "}}]] – No {{tl|tfd links}}, a human must close it.\n";
                    $ct++;
                }
                next;
            }

            next unless $s->{'level'};
            $ct++;
            foreach my $t (@templates){
                $tmpl{$t}=undef;
            }
            push @secs, [ $s, @templates ];
        }
        next if($ct==0 && @closed==0 && !$fixedhead && !$fixed);

        # Check if the unclosed templates still exist.
        my @titles=keys %tmpl;
        while(@titles){
            my @tmpl=splice(@titles, 0, 500);
            $res=$api->query(
                titles => join('|', @tmpl),
                prop   => 'info',
            );
            if($res->{'code'} ne 'success'){
                $api->warn("Failed to retrieve template info for $title: ".$res->{'error'}."\n");
                return 60;
            }
            my %map=();
            %map=map { $_->{'to'}, $_->{'from'} } @{$res->{'query'}{'normalized'}} if exists($res->{'query'}{'normalized'});
            PAGE: foreach (values %{$res->{'query'}{'pages'}}){
                next PAGE unless exists($_->{'missing'});

                my $tmpl=$api->apply_redirect_map( $_->{'title'}, \%map );
                if(!exists($tmpl{$tmpl})){
                    my $d=Dumper($_); $d=~s/\s+/ /g;
                    $api->warn("How odd, this was apparently returned even though it wasn't requested: $d\n");
                    next PAGE;
                }

                my $msg=undef;
                # First, check for a deletion.
                my $r=$api->query(
                    letitle => $_->{'title'},
                    list    => 'logevents',
                    letype  => 'delete',
                    lelimit => 1,
                    leprop  => 'user|timestamp|comment',
                );
                if($r->{'code'} ne 'success'){
                    $api->warn("Failed to retrieve logs for ".$_->{'title'}.": ".$r->{'error'}."\n");
                    return 60;
                }
                if(exists($r->{'query'}{'logevents'}[0])){
                    my $log=$r->{'query'}{'logevents'}[0];

                    # Skip for now if it was deleted within the past hour, to
                    # give the closing admin a chance to close it themself.
                    my $t=ISO2timestamp($log->{'timestamp'});
                    next PAGE if(time()-$t<3600);

                    # Check whether the deletion log entry could reasonably
                    # belong to this TFD: the deletion log entry should be
                    # dated on or after the TFD page date. Give them a day of
                    # leeway just in case.
                    $t=_date_add(_make_date($t),1,0,0);
                    if(_cmp_date($t,$date)>=0){
                        # Close it!
                        $msg="'''Delete'''; deleted";
                        if($log->{'comment'}=~/CSD(?:#|\]\] | )([GT]\d+)/i ||
                            $log->{'comment'}=~/db-([gt]\d+)/){
                            my $c=uc($1);
                            $msg.=" as [[WP:CSD#$c|$c]]";
                        } elsif($log->{'comment'}=~/db-([a-z])/ && exists($db{$1})){
                            my $c=$db{$1};
                            $msg.=" as [[WP:CSD#$c|$c]]";
                        }
                        $msg.=" by {{admin|".$log->{'user'}."}}";
                    }
                }
                # Check for a move-without-redirect
                $r=$api->query(
                    letitle => $_->{'title'},
                    list    => 'logevents',
                    letype  => 'move',
                    lelimit => 1,
                    leprop  => 'user|timestamp|comment|details',
                );
                if($r->{'code'} ne 'success'){
                    $api->warn("Failed to retrieve logs for ".$_->{'title'}.": ".$r->{'error'}."\n");
                    return 60;
                }
                if(exists($r->{'query'}{'logevents'}[0])){
                    my $log=$r->{'query'}{'logevents'}[0];

                    next PAGE unless exists( $log->{'params'}{'suppressredirect'} );

                    # Skip for now if it was deleted within the past hour, to
                    # give the closing admin a chance to close it themself.
                    my $t=ISO2timestamp($log->{'timestamp'});
                    next PAGE if(time()-$t<3600);

                    # Check whether the move log entry could reasonably
                    # belong to this TFD: the move log entry should be
                    # dated on or after the TFD page date. Give them a day of
                    # leeway just in case.
                    $t=_date_add(_make_date($t),1,0,0);
                    if(_cmp_date($t,$date)>=0){
                        # Close it!
                        $msg="'''Moved without redirect'''";
                        if(($log->{'params'}{'target_title'} // '') ne '') {
                            $msg .= ' to [[:' . $log->{'params'}{'target_title'} . ']]';
                        }
                        if($log->{'comment'} ne '') {
                            $msg .= ' with comment "<nowiki>' . $log->{'comment'} . '</nowiki>"';
                        }
                        $msg.=" by {{admin|".$log->{'user'}."}}";
                    }
                }
                if(!defined($msg)){
                    my $what = $_->{'title'} =~ /^Module:/ ? 'Module' : 'Template';
                    $msg="'''$what does not exist'''. If the title linked contains a typo, feel free to correct the typo and un-close this discussion.";
                }
                next if !defined($msg);
                $tmpl{$tmpl}=$msg;
            }
        }

        # Now check the discussions to determine if all are closed.
        foreach my $sec (@secs){
            my @tmpl=@$sec;
            my $s = shift @tmpl;
            my %msgs=();
            my $ok=1;
            foreach my $t (@tmpl){
                $ok=0 unless defined($tmpl{$t});
                last unless $ok;
                push @{$msgs{$tmpl{$t}}}, "[[:$t]]";
            }
            unless ( $ok ) {
                push @pageoldlinks, "* [[$title#{{anchorencode:" . $s->{'title'} . "}}]]\n";
                next;
            }
            $sec->[0]{'body'}=~s/^\s+|\s+$//g;
            my @msgs=keys %msgs;
            my $msg="\x02!!!!\x03\n";
            if(@msgs==1){
                $msg="{{subst:tfd top|1=".$msgs[0]." ~~~~}}\n";
            } else {
                $msg="{{subst:tfd top|1='''Delete''' for multiple reasons:\n";
                foreach my $m (@msgs){
                    $msg.="* ".join(", ", @{$msgs{$m}}).": $m\n";
                }
                $msg.="~~~~}}\n";
            }
            $sec->[0]{'body'}=$msg.$sec->[0]{'body'}."\n{{subst:tfd bottom}}\n";
            $ct--;
            push @closed, (@tmpl==1 ? "[[:".$tmpl[0]."]]" : '"'.$sec->[0]{'title'}.'"');
        }

        # Mark for entry on the list of old TFDs, if applicable
        if($ct>0){
            if(_cmp_date($date,$sevendays)<0){
                push @old, "{{$title}}\n";
                unshift @oldsumm, [@$date];
            }
            $new_start=[@$date];
        }

        if(_cmp_date($date,$sevendays)<0){
            push @oldlinks, @pageoldlinks;
        }

        # Need to edit?
        next unless(@closed || $fixed || $fixedhead);

        # Processed, now reconstruct the page
        $outtxt=$api->join_sections(@sections);

        # Subst templates, if necessary
        my $subst=0;
        $outtxt=$api->process_templates($outtxt, sub {
            my $name=shift;
            shift; #$params
            my $wikitext=shift;

            return undef unless exists($tosubst{"Template:$name"});
            $subst++;
            $wikitext=~s/^\{\{\s*/\{\{subst:/;
            return $wikitext;
        });

        # Create summary
        my @summary=();
        if($fixedhead){
            if(exists($tok->{'missing'})){
                push @summary, "new discussion page: ".$date->[2].' '.$months[$date->[1]].' '.$date->[0];
            } else {
                push @summary, "fix page header";
            }
        }
        push @summary, "subst {{tfd top}} and/or {{tfd bottom}}" if $subst>0;
        push @summary, 'move closing box'.(($fixed>1)?'es':'').' per [[WP:DPR#TFD]]' if $fixed;
        my $toomany=@summary;
        push @summary, 'close discussions for deleted/nonexistent templates: '.join(', ', @closed) if @closed;
        my $summary='(BOT) '.ucfirst(join('; ', @summary)).".$screwup";
        $api->log("$summary in $title");
        if(length($summary)>500){
            $summary[$toomany]='close discussions for deleted/nonexistent templates:  [too many to list]' if @closed;
            $summary='(BOT) '.ucfirst(join('; ', @summary)).$screwup;
        }
        my $r=$api->edit($tok, $outtxt, $summary, 0, 1);
        if($r->{'code'} ne 'success'){
            $api->warn("Write failed on $title: ".$r->{'error'}."\n");
            return 60;
        }
    }

    # Ok, we've processed all the subpages. Now update the page of links to old
    # unclosed discussions.
    my $title='Wikipedia:Templates for discussion/Old unclosed discussions';
    $api->log("Updating discussions lists on $title");
    my $tok=$api->edittoken($title);
    if($tok->{'code'} eq 'shutoff'){
        $api->warn("Task disabled: ".$tok->{'content'}."\n");
        return 300;
    }
    if($tok->{'code'} ne 'success'){
        $api->warn("Failed to get edit token for $title: ".$tok->{'error'}."\n");
        return 60;
    }
    my $intxt=$tok->{'revisions'}[0]{'slots'}{'main'}{'*'} // '';
    $intxt=~s/Last updated .*?<!-- Bot edit date -->/Last updated ~~~~~<!-- Bot edit date -->/;
    $intxt=~s/\s*$/\n/;
    my $outtxt="This is a list of unclosed TfDs over 7 days old. It is automatically maintained by a bot, but humans are free to remove lines when closing discussions if they'd like. Last updated ~~~~~<!-- Bot edit date -->.\n\n";
    if ( @oldlinks ) {
        $outtxt .= join( '', @oldlinks );
    } else {
        $outtxt .= "* None at this time\n";
    }
    if($intxt ne $outtxt){
        my $summary;
        if(@oldsumm){
            my $m=0;
            my @oldsumm2=map {
                my $ret;
                if($_->[1]!=$m){
                    $m=$_->[1];
                    $ret=substr($months[$_->[1]],0,3).' '.$_->[0];
                } else {
                    $ret=$_->[0];
                }
                $ret
            } @oldsumm;
            $oldsumm2[-1].='.';
            $summary='(BOT) Updating discussions: '.join(', ', @oldsumm2).$screwup;
            $api->log("$summary in $title");
            $summary='(BOT) Updating discussions: major backlog!'.$screwup if length($summary)>500;
        } else {
            $summary='(BOT) Updating discussions: no old discussions'.$screwup;
        }
        my $r=$api->edit($tok, $outtxt, $summary, 0, 1);
        if($r->{'code'} ne 'success'){
            $api->warn("Write failed on $title: ".$r->{'error'}."\n");
            return 60;
        }
    }

    # Save checked revision
    $self->{'lasttime'}=$starttime;
    $self->{'broken'}=$broken;
    $api->store->{'startdate'}=$new_start;
    $api->store->{'lasttime'}=$starttime;
    $api->store->{'broken'}=$broken;

    return $starttime+($self->{'broken'}?300:3600)-time;
}

sub _make_date {
    my $t=shift || time;
    if(ref($t) eq 'ARRAY'){
        return _fix_date([@$t]);
    } else {
        my @t=gmtime($t);
        @t=@t[3..5];
        $t[1]+=1;
        $t[2]+=1900;
        return [@t];
    }
}

sub _date_add {
    my @t=@{$_[0]};
    $t[0]+=$_[1];
    $t[1]+=$_[2];
    $t[2]+=$_[3];
    return _fix_date([@t]);
}

sub _fix_date {
    my $t=shift;
    my @t=gmtime(timegm(0,0,0,$t->[0],$t->[1]-1,$t->[2]-1900));
    @t=@t[3..5];
    $t[1]+=1;
    $t[2]+=1900;
    return [@t];
}

sub _cmp_date {
    my $a=shift;
    my $b=shift;
    my $x;

    $x=$a->[2]-$b->[2];
    $x=$a->[1]-$b->[1] if $x==0;
    $x=$a->[0]-$b->[0] if $x==0;
    return $x;
}

sub _makepagehead {
    my $api = shift;
    my $title = shift;
    my $date = shift;

    my $res = $api->query(
        action => 'parse',
        title => $title,
        text => '{{subst:TfD log day|' . $date->[2] . '|' . $months[$date->[1]] . '|' . $date->[0] . '}}',
        onlypst => 1,
        formatversion => 2,
    );
    return ( undef, $res->{'error'} ) if $res->{'code'} ne 'success';

    my $txt = $res->{'parse'}{'text'};
    $txt =~ s/\s*$/\n/s;

    return ($txt, undef);
}


1;