path: root/IkiWiki/Plugin/rename.pm

#!/usr/bin/perl
package IkiWiki::Plugin::rename;

use warnings;
use strict;
use IkiWiki 3.00;

sub import {
    hook(type => "getsetup", id => "rename", call => \&getsetup);
    hook(type => "formbuilder_setup", id => "rename", call => \&formbuilder_setup);
    hook(type => "formbuilder", id => "rename", call => \&formbuilder);
    hook(type => "sessioncgi", id => "rename", call => \&sessioncgi);
    hook(type => "rename", id => "rename", call => \&rename_subpages);
}

sub getsetup () {
    return 
        plugin => {
            safe => 1,
            rebuild => 0,
            section => "web",
        },
}

sub check_canrename ($$$$$$) {
    my $src=shift;
    my $srcfile=shift;
    my $dest=shift;
    my $destfile=shift;
    my $q=shift;
    my $session=shift;

    my $attachment=! defined pagetype($pagesources{$src});

    # Must be a known source file.
    if (! exists $pagesources{$src}) {
        error(sprintf(gettext("%s does not exist"),
            htmllink("", "", $src, noimageinline => 1)));
    }
    
    # Must exist on disk, and be a regular file.
    if (! -e "$config{srcdir}/$srcfile") {
        error(sprintf(gettext("%s is not in the srcdir, so it cannot be renamed"), $srcfile));
    }
    elsif (-l "$config{srcdir}/$srcfile" && ! -f _) {
        error(sprintf(gettext("%s is not a file"), $srcfile));
    }

    # Must be editable.
    IkiWiki::check_canedit($src, $q, $session);
    if ($attachment) {
        if (IkiWiki::Plugin::attachment->can("check_canattach")) {
            IkiWiki::Plugin::attachment::check_canattach($session, $src, "$config{srcdir}/$srcfile");
        }
        else {
            error("renaming of attachments is not allowed");
        }
    }
    
    # Dest checks can be omitted by passing undef.
    if (defined $dest) {
        if ($srcfile eq $destfile) {
            error(gettext("no change to the file name was specified"));
        }

        # Must be a legal filename.
        if (IkiWiki::file_pruned($destfile)) {
            error(sprintf(gettext("illegal name")));
        }

        # Must not be a known source file.
        if ($src ne $dest && exists $pagesources{$dest}) {
            error(sprintf(gettext("%s already exists"),
                htmllink("", "", $dest, noimageinline => 1)));
        }
    
        # Must not exist on disk already.
        if (-l "$config{srcdir}/$destfile" || -e _) {
            error(sprintf(gettext("%s already exists on disk"), $destfile));
        }
    
        # Must be editable.
        IkiWiki::check_canedit($dest, $q, $session);
        if ($attachment) {
            # Note that $srcfile is used here, not $destfile,
            # because it wants the current file, to check it.
            IkiWiki::Plugin::attachment::check_canattach($session, $dest, "$config{srcdir}/$srcfile");
        }
    }

    my $canrename;
    IkiWiki::run_hooks(canrename => sub {
        return if defined $canrename;
        my $ret=shift->(cgi => $q, session => $session,
            src => $src, srcfile => $srcfile,
            dest => $dest, destfile => $destfile);
        if (defined $ret) {
            if ($ret eq "") {
                $canrename=1;
            }
            elsif (ref $ret eq 'CODE') {
                $ret->();
                $canrename=0;
            }
            elsif (defined $ret) {
                error($ret);
                $canrename=0;
            }
        }
    });
    return defined $canrename ? $canrename : 1;
}

sub rename_form ($$$) {
    my $q=shift;
    my $session=shift;
    my $page=shift;

    eval q{use CGI::FormBuilder};
    error($@) if $@;
    my $f = CGI::FormBuilder->new(
        name => "rename",
        title => sprintf(gettext("rename %s"), pagetitle($page)),
        header => 0,
        charset => "utf-8",
        method => 'POST',
        javascript => 0,
        params => $q,
        action => IkiWiki::cgiurl(),
        stylesheet => 1,
        fields => [qw{do page new_name attachment}],
    );
    
    $f->field(name => "do", type => "hidden", value => "rename", force => 1);
    $f->field(name => "sid", type => "hidden", value => $session->id,
        force => 1);
    $f->field(name => "page", type => "hidden", value => $page, force => 1);
    $f->field(name => "new_name", value => pagetitle($page, 1), size => 60);
    if (!$q->param("attachment")) {
        # insert the standard extensions
        my @page_types;
        if (exists $IkiWiki::hooks{htmlize}) {
            foreach my $key (grep { !/^_/ } keys %{$IkiWiki::hooks{htmlize}}) {
                push @page_types, [$key, $IkiWiki::hooks{htmlize}{$key}{longname} || $key];
            }
        }
        @page_types=sort @page_types;
    
        # make sure the current extension is in the list
        my ($ext) = $pagesources{$page}=~/\.([^.]+)$/;
        if (! $IkiWiki::hooks{htmlize}{$ext}) {
            unshift(@page_types, [$ext, $ext]);
        }
    
        $f->field(name => "type", type => 'select',
            options => \@page_types,
            value => $ext, force => 1);
        
        foreach my $p (keys %pagesources) {
            if ($pagesources{$p}=~m/^\Q$page\E\//) {
                $f->field(name => "subpages",
                    label => "",
                    type => "checkbox",
                    options => [ [ 1 => gettext("Also rename SubPages and attachments") ] ],
                    value => 1,
                    force => 1);
                last;
            }
        }
    }
    $f->field(name => "attachment", type => "hidden");

    return $f, ["Rename", "Cancel"];
}

sub rename_start ($$$$) {
    my $q=shift;
    my $session=shift;
    my $attachment=shift;
    my $page=shift;

    check_canrename($page, $pagesources{$page}, undef, undef,
        $q, $session);

    # Save current form state to allow returning to it later
    # without losing any edits.
    # (But don't save what button was submitted, to avoid
    # looping back to here.)
    # Note: "_submit" is CGI::FormBuilder internals.
    $q->param(-name => "_submit", -value => "");
    $session->param(postrename => scalar $q->Vars);
    IkiWiki::cgi_savesession($session);
    
    if (defined $attachment) {
        $q->param(-name => "attachment", -value => $attachment);
    }
    my ($f, $buttons)=rename_form($q, $session, $page);
    IkiWiki::showform($f, $buttons, $session, $q);
    exit 0;
}

sub postrename ($;$$$) {
    my $session=shift;
    my $src=shift;
    my $dest=shift;
    my $attachment=shift;

    # Load saved form state and return to edit page.
    my $postrename=CGI->new($session->param("postrename"));
    $session->clear("postrename");
    IkiWiki::cgi_savesession($session);

    if (defined $dest) {
        if (! $attachment) {
            # They renamed the page they were editing. This requires
            # fixups to the edit form state.
            # Tweak the edit form to be editing the new page.
            $postrename->param("page", $dest);
        }

        # Update edit form content to fix any links present
        # on it.
        $postrename->param("editcontent",
            renamepage_hook($dest, $src, $dest,
                 $postrename->param("editcontent")));

        # Get a new edit token; old was likely invalidated.
        $postrename->param("rcsinfo",
            IkiWiki::rcs_prepedit($pagesources{$dest}));
    }

    IkiWiki::cgi_editpage($postrename, $session);
}

sub formbuilder (@) {
    my %params=@_;
    my $form=$params{form};

    if (defined $form->field("do") && ($form->field("do") eq "edit" ||
        $form->field("do") eq "create")) {
            IkiWiki::decode_form_utf8($form);
        my $q=$params{cgi};
        my $session=$params{session};

        if ($form->submitted eq "Rename" && $form->field("do") eq "edit") {
            rename_start($q, $session, 0, $form->field("page"));
        }
        elsif ($form->submitted eq "Rename Attachment") {
            my @selected=map { Encode::decode_utf8($_) } $q->param("attachment_select");
            if (@selected > 1) {
                error(gettext("Only one attachment can be renamed at a time."));
            }
            elsif (! @selected) {
                error(gettext("Please select the attachment to rename."))
            }
            rename_start($q, $session, 1, $selected[0]);
        }
    }
}

my $renamesummary;

sub formbuilder_setup (@) {
    my %params=@_;
    my $form=$params{form};
    my $q=$params{cgi};

    if (defined $form->field("do") && ($form->field("do") eq "edit" ||
        $form->field("do") eq "create")) {
        # Rename button for the page, and also for attachments.
        push @{$params{buttons}}, "Rename" if $form->field("do") eq "edit";
        $form->tmpl_param("field-rename" => '<input name="_submit" type="submit" value="Rename Attachment" />');

        if (defined $renamesummary) {
            $form->tmpl_param(message => $renamesummary);
        }
    }
}

sub sessioncgi ($$) {
        my $q=shift;

    if ($q->param("do") eq 'rename') {
            my $session=shift;
        my ($form, $buttons)=rename_form($q, $session, Encode::decode_utf8($q->param("page")));
        IkiWiki::decode_form_utf8($form);

        if ($form->submitted eq 'Cancel') {
            postrename($session);
        }
        elsif ($form->submitted eq 'Rename' && $form->validate) {
            IkiWiki::checksessionexpiry($q, $session, $q->param('sid'));

            # Queue of rename actions to perfom.
            my @torename;

            # These untaints are safe because of the checks
            # performed in check_canrename later.
            my $src=$form->field("page");
            my $srcfile=IkiWiki::possibly_foolish_untaint($pagesources{$src});
            my $dest=IkiWiki::possibly_foolish_untaint(titlepage($form->field("new_name")));
            my $destfile=$dest;
            if (! $q->param("attachment")) {
                my $type=$q->param('type');
                if (defined $type && length $type && $IkiWiki::hooks{htmlize}{$type}) {
                    $type=IkiWiki::possibly_foolish_untaint($type);
                }
                else {
                    my ($ext)=$srcfile=~/\.([^.]+)$/;
                    $type=$ext;
                }
                
                $destfile=newpagefile($dest, $type);
            }
            push @torename, {
                src => $src,
                    srcfile => $srcfile,
                dest => $dest,
                    destfile => $destfile,
                required => 1,
            };

            @torename=rename_hook(
                torename => \@torename,
                done => {},
                cgi => $q,
                session => $session,
            );

            require IkiWiki::Render;
            IkiWiki::disable_commit_hook() if $config{rcs};
            my %origpagesources=%pagesources;

            # First file renaming.
            foreach my $rename (@torename) {
                if ($rename->{required}) {
                    do_rename($rename, $q, $session);
                }
                else {
                    eval {do_rename($rename, $q, $session)};
                    if ($@) {
                        $rename->{error}=$@;
                        next;
                    }
                }

                # Temporarily tweak pagesources to point to
                # the renamed file, in case fixlinks needs
                # to edit it.
                $pagesources{$rename->{src}}=$rename->{destfile};
            }
            IkiWiki::rcs_commit_staged(
                message => sprintf(gettext("rename %s to %s"), $srcfile, $destfile),
                session => $session,
            ) if $config{rcs};

            # Then link fixups.
            foreach my $rename (@torename) {
                next if $rename->{src} eq $rename->{dest};
                next if $rename->{error};
                foreach my $p (fixlinks($rename, $session)) {
                    # map old page names to new
                    foreach my $r (@torename) {
                        next if $rename->{error};
                        if ($r->{src} eq $p) {
                            $p=$r->{dest};
                            last;
                        }
                    }
                    push @{$rename->{fixedlinks}}, $p;
                }
            }

            # Then refresh.
            %pagesources=%origpagesources;
            if ($config{rcs}) {
                IkiWiki::enable_commit_hook();
                IkiWiki::rcs_update();
            }
            IkiWiki::refresh();
            IkiWiki::saveindex();

            # Find pages with remaining, broken links.
            foreach my $rename (@torename) {
                next if $rename->{src} eq $rename->{dest};
                
                foreach my $page (keys %links) {
                    my $broken=0;
                    foreach my $link (@{$links{$page}}) {
                        my $bestlink=bestlink($page, $link);
                        if ($bestlink eq $rename->{src}) {
                            push @{$rename->{brokenlinks}}, $page;
                            last;
                        }
                    }
                }
            }

            # Generate a summary, that will be shown at the top
            # of the edit template.
            $renamesummary="";
            foreach my $rename (@torename) {
                my $template=template("renamesummary.tmpl");
                $template->param(src => $rename->{srcfile});
                $template->param(dest => $rename->{destfile});
                $template->param(error => $rename->{error});
                if ($rename->{src} ne $rename->{dest}) {
                    $template->param(brokenlinks_checked => 1);
                    $template->param(brokenlinks => linklist($rename->{dest}, $rename->{brokenlinks}));
                    $template->param(fixedlinks => linklist($rename->{dest}, $rename->{fixedlinks}));
                }
                $renamesummary.=$template->output;
            }

            postrename($session, $src, $dest, $q->param("attachment"));
        }
        else {
            IkiWiki::showform($form, $buttons, $session, $q);
        }

        exit 0;
    }
}

# Add subpages to the list of pages to be renamed, if needed.
sub rename_subpages (@) {
    my %params = @_;

    my %torename = %{$params{torename}};
    my $q = $params{cgi};
    my $src = $torename{src};
    my $srcfile = $torename{src};
    my $dest = $torename{dest};
    my $destfile = $torename{dest};

    return () unless ($q->param("subpages") && $src ne $dest);

    my @ret;
    foreach my $p (keys %pagesources) {
        next unless $pagesources{$p}=~m/^\Q$src\E\//;
        # If indexpages is enabled, the srcfile should not be confused
        # with a subpage.
        next if $pagesources{$p} eq $srcfile;

        my $d=$pagesources{$p};
        $d=~s/^\Q$src\E\//$dest\//;
        push @ret, {
            src => $p,
            srcfile => $pagesources{$p},
            dest => pagename($d),
            destfile => $d,
            required => 0,
        };
    }
    return @ret;
}

sub linklist {
    # generates a list of links in a form suitable for FormBuilder
    my $dest=shift;
    my $list=shift;
    # converts a list of pages into a list of links
    # in a form suitable for FormBuilder.

    [map {
        {
            page => htmllink($dest, $dest, $_,
                    noimageinline => 1,
                    linktext => pagetitle($_),
                )
        }
    } @{$list}]
}

sub renamepage_hook ($$$$) {
    my ($page, $src, $dest, $content)=@_;

    IkiWiki::run_hooks(renamepage => sub {
        $content=shift->(
            page => $page,
            oldpage => $src,
            newpage => $dest,
            content => $content,
        );
    });

    return $content;
}

sub rename_hook {
    my %params = @_;

    my @torename=@{$params{torename}};
    my %done=%{$params{done}};
    my $q=$params{cgi};
    my $session=$params{session};

    return () unless @torename;

    my @nextset;
    foreach my $torename (@torename) {
        unless (exists $done{$torename->{src}} && $done{$torename->{src}}) {
            IkiWiki::run_hooks(rename => sub {
                push @nextset, shift->(
                    torename => $torename,
                    cgi => $q,
                    session => $session,
                );
            });
            $done{$torename->{src}}=1;
        }
    }

    push @torename, rename_hook(
        torename => \@nextset,
        done => \%done,
        cgi => $q,
        session => $session,
    );

    # dedup
    my %seen;
    return grep { ! $seen{$_->{src}}++ } @torename;
}

sub do_rename ($$$) {
    my $rename=shift;
    my $q=shift;
    my $session=shift;

    # First, check if this rename is allowed.
    check_canrename($rename->{src},
        $rename->{srcfile},
        $rename->{dest},
        $rename->{destfile},
        $q, $session);

    # Ensure that the dest directory exists and is ok.
    IkiWiki::prep_writefile($rename->{destfile}, $config{srcdir});

    if ($config{rcs}) {
        IkiWiki::rcs_rename($rename->{srcfile}, $rename->{destfile});
    }
    else {
        if (! rename($config{srcdir}."/".$rename->{srcfile},
                     $config{srcdir}."/".$rename->{destfile})) {
            error("rename: $!");
        }
    }

}

sub fixlinks ($$$) {
    my $rename=shift;
    my $session=shift;

    my @fixedlinks;

    foreach my $page (keys %links) {
        my $needfix=0;
        foreach my $link (@{$links{$page}}) {
            my $bestlink=bestlink($page, $link);
            if ($bestlink eq $rename->{src}) {
                $needfix=1;
                last;
            }
        }
        if ($needfix) {
            my $file=$pagesources{$page};
            my $oldcontent=readfile($config{srcdir}."/".$file);
            my $content=renamepage_hook($page, $rename->{src}, $rename->{dest}, $oldcontent);
            if ($oldcontent ne $content) {
                my $token=IkiWiki::rcs_prepedit($file);
                eval { writefile($file, $config{srcdir}, $content) };
                next if $@;
                my $conflict=IkiWiki::rcs_commit(
                    file => $file,
                    message => sprintf(gettext("update for rename of %s to %s"), $rename->{srcfile}, $rename->{destfile}),
                    token => $token,
                    session => $session,
                );
                push @fixedlinks, $page if ! defined $conflict;
            }
        }
    }

    return @fixedlinks;
}

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