web commit by http://joey.kitenet.net/

[ikiwiki] / doc / todo / Moving_Pages.mdwn

I thought I'd draw attention to a desire of mine for **ikiwiki**.  I'm no power-user, and mostly I do fairly simple stuff with my [wiki](http://kitenet.net/~kyle/family/wiki).

However, I would like the ability (now) to **rename/move/delete** pages.  As part of having a genealogy wiki, I've put name and dates of birth/death as part of the title of each article (so to avoid cases where people have the same name, but are children/cousins/etc of others with that name).  However, some of this information changes.  For instance, I didn't know a date of death and now I do, or I had it wrong originally, or it turns out someone is still alive I didn't know about.  All of these cases leave me with bad article titles.

So, I can go ahead and move the file to a new page with the correct info, orphan that page, provide a link for the new page if desired, and otherwise ignore that page.  But then, it clutters up the wiki and serves no useful purpose.

Anyway to consider implementing **rename/move/delete** ?  I certainly lack the skills to appreciate what this would entail, but feel free to comment if it appears impossible, and then I'll go back to the aforementioned workaround.  I would prefer simple rename, however.

Thanks again to [Joey](http://kitenet.net/~joey) for putting ikiwiki together.  I love the program. 

*[Kyle](http://kitenet.net/~kyle/)=*

----

The MediaWiki moving/renaming mechanism is pretty nice.  It's easy to get a list of pages that point to the current page.  When renaming a page it sticks a forwarding page in the original place.  The larger the size of the wiki the more important organization tools become.

I see the need for:

* a new type of file to represent a forwarding page
* a rename tool that can
  * move the existing page to the new name
  * optionally drop a forwarding page
  * optionally rewrite incoming links to the new location

Brad

> This could be implemented through the use of an HTTP redirect to the 
> new page, but this has the downside that people may not know they're being 
> redirected.
>
> This could also be implemented using a combination of raw inline and meta
> to change the title (add a "redirected from etc." page. This could be done
> with a plugin. A redirect page would be [[redirect page="newpage"]].
> But then if you click "edit" on this redirect page, you won't be able
> to edit the new page, only the call to redirect.
> --Ethan

-----

[[tag patch]]

This is my second cut at a feature like that requested here.
It can also be found [here](http://ikidev.betacantrips.com/patches/move.patch).

A few shortcomings exist: 

* No precautions whatsoever are made to protect against race conditions or failures
  in the rcs\_move function. I didn't even do the `cgi_editpage` thing where I hold
  the lock and render afterwards (mostly because the copy I was editing was not
  up-to-date enough to have that code). Although FAILED_SAVE is in movepage.tmpl,
  no code activates it yet.
* Some code is duplicated between cgi\_movepage and cgi\_editpage, as well
  as rcs\_commit and rcs\_move.
* The user interface is pretty lame. I couldn't figure out a good way to let
  the user specify which directory to move things to without implementing a
  FileChooser thing.
* No redirect pages like those mentioned on [[todo/Moving_Pages]] exist yet, 
  so none are created.
* I added a Move link to page.tmpl but it may belong better someplace else --
  maybe editpage.tmpl? Not sure.
* from is redundant with page so far -- but since the Move links could someday
  come from someplace other than the page itself I kept it around.
* If I move foo.mdwn to bar.mdwn, foo/* should move too, probably.

> Looks like a good start, although I agree about many of the points above,
> and also feel that something needs to be done about rcses that don't
> implement a move operation -- falling back to an add and delete.
> --[[Joey]]

Hmm. Shouldn't that be done on a by-RCS basis, though? (i.e. implemented
by backends in the `rcs_move` function)

> Probably, yes, but maybe there's a way to avoid duplicating code for that
> in several of them.

Also, how should ikiwiki react if a page is edited (say, by another user)
before it is moved? Bail, or shrug and proceed?

> The important thing is to keep in mind that the page could be edited,
> moved, deleted, etc in between the user starting the move and the move
> happening. So, the code really needs to deal with all of these cases in
> some way. It seems fine to me to go ahead with the move even if the page
> was edited. If the page was deleted or moved, it seems reasonable to exit
> with an error.

    diff -urNX ignorepats ikiwiki/IkiWiki/CGI.pm ikidev/IkiWiki/CGI.pm
    --- ikiwiki/IkiWiki/CGI.pm  2007-02-14 18:17:12.000000000 -0800
    +++ ikidev/IkiWiki/CGI.pm   2007-02-22 18:54:23.194982000 -0800
    @@ -561,6 +561,106 @@
        }
     } #}}}

    +sub cgi_movepage($$) {
    +   my $q = shift;
    +   my $session = shift;
    +   eval q{use CGI::FormBuilder};
    +   error($@) if $@;
    +   my @fields=qw(do from rcsinfo page newdir newname comments);
    +   my @buttons=("Rename Page", "Cancel");
    +
    +   my $form = CGI::FormBuilder->new(
    +           fields => \@fields,
    +                header => 1,
    +                charset => "utf-8",
    +                method => 'POST',
    +           action => $config{cgiurl},
    +                template => (-e "$config{templatedir}/movepage.tmpl" ?
    +                        {template_params("movepage.tmpl")} : ""),
    +   );
    +   run_hooks(formbuilder_setup => sub {
    +           shift->(form => $form, cgi => $q, session => $session);
    +   });
    +
    +   decode_form_utf8($form);
    +
    +   # This untaint is safe because if the page doesn't exist, bail.
    +   my $page = $form->field('page');
    +   $page = possibly_foolish_untaint($page);
    +   if (! exists $pagesources{$page}) {
    +           error("page does not exist");
    +   }
    +   my $file=$pagesources{$page};
    +   my $type=pagetype($file);
    +
    +   my $from;
    +   if (defined $form->field('from')) {
    +           ($from)=$form->field('from')=~/$config{wiki_file_regexp}/;
    +   }
    +
    +   $form->field(name => "do", type => 'hidden');
    +   $form->field(name => "from", type => 'hidden');
    +   $form->field(name => "rcsinfo", type => 'hidden');
    +   $form->field(name => "newdir", type => 'text', size => 80);
    +   $form->field(name => "page", value => $page, force => 1);
    +   $form->field(name => "newname", type => "text", size => 80);
    +   $form->field(name => "comments", type => "text", size => 80);
    +   $form->tmpl_param("can_commit", $config{rcs});
    +   $form->tmpl_param("indexlink", indexlink());
    +   $form->tmpl_param("baseurl", baseurl());
    +
    +   if (! $form->submitted) {
    +           $form->field(name => "rcsinfo", value => rcs_prepedit($file),
    +                        force => 1);
    +   }
    +
    +   if ($form->submitted eq "Cancel") {
    +           redirect($q, "$config{url}/".htmlpage($page));
    +           return;
    +   }
    +
    +   if (! $form->submitted || ! $form->validate) {
    +           check_canedit($page, $q, $session);
    +           $form->tmpl_param("page_select", 0);
    +           $form->field(name => "page", type => 'hidden');
    +           $form->field(name => "type", type => 'hidden');
    +           $form->title(sprintf(gettext("moving %s"), pagetitle($page)));
    +           my $pname = basename($page);
    +           my $dname = dirname($page);
    +           if (! defined $form->field('newname') ||
    +               ! length $form->field('newname')) {
    +                   $form->field(name => "newname",
    +                                value => pagetitle($pname, 1), force => 1);
    +           }
    +           if (! defined $form->field('newdir') ||
    +               ! length $form->field('newdir')) {
    +                   $form->field(name => "newdir",
    +                                value => pagetitle($dname, 1), force => 1);
    +           }
    +           print $form->render(submit => \@buttons);
    +   }
    +   else{
    +           # This untaint is safe because titlepage removes any problematic
    +           # characters.
    +           my ($newname)=$form->field('newname');
    +           $newname=titlepage(possibly_foolish_untaint($newname));
    +           my ($newdir)=$form->field('newdir');
    +           $newdir=titlepage(possibly_foolish_untaint($newdir));
    +           if (! defined $newname || ! length $newname || file_pruned($newname, $config{srcdir}) || $newname=~/^\//) {
    +                   error("bad page name");
    +           }
    +           check_canedit($page, $q, $session);
    +
    +           my $newpage = ($newdir?"$newdir/":"") . $newname;
    +           my $newfile = $newpage . ".$type";
    +           my $message = $form->field('comments');
    +           unlockwiki();
    +           rcs_move($file, $newfile, $message, $form->field("rcsinfo"),
    +                    $session->param("name"), $ENV{REMOTE_ADDR});
    +           redirect($q, "$config{url}/".htmlpage($newpage));
    +   }
    +}
    +
     sub cgi_getsession ($) { #{{{
        my $q=shift;

    @@ -656,6 +756,9 @@
        elsif (defined $session->param("postsignin")) {
                cgi_postsignin($q, $session);
        }
    +   elsif ($do eq 'move') {
    +           cgi_movepage($q, $session);
    +   }
        elsif ($do eq 'prefs') {
                cgi_prefs($q, $session);
        }
    diff -urNX ignorepats ikiwiki/IkiWiki/Rcs/svn.pm ikidev/IkiWiki/Rcs/svn.pm
    --- ikiwiki/IkiWiki/Rcs/svn.pm      2007-01-27 16:04:48.000000000 -0800
    +++ ikidev/IkiWiki/Rcs/svn.pm       2007-02-22 01:51:29.923626000 -0800
    @@ -60,6 +60,34 @@
        }
     } #}}}

    +sub rcs_move ($$$$;$$) {
    +   my $file=shift;
    +   my $newname=shift;
    +   my $message=shift;
    +   my $rcstoken=shift;
    +   my $user=shift;
    +   my $ipaddr=shift;
    +   if (defined $user) {
    +           $message="web commit by $user".(length $message ? ": $message" : "");
    +   }
    +   elsif (defined $ipaddr) {
    +           $message="web commit from $ipaddr".(length $message ? ": $message" : "");
    +   }
    +
    +   chdir($config{srcdir}); # svn merge wants to be here
    +
    +   if (system("svn", "move", "--quiet",
    +              "$file", "$newname") != 0) {
    +           return 1;
    +   }
    +   if (system("svn", "commit", "--quiet",
    +              "--encoding", "UTF-8", "-m",
    +              possibly_foolish_untaint($message)) != 0) {
    +           return 1;
    +   }
    +   return undef # success
    +}
    +
     sub rcs_commit ($$$;$$) { #{{{
        # Tries to commit the page; returns undef on _success_ and
        # a version of the page with the rcs's conflict markers on failure.
    diff -urNX ignorepats ikiwiki/IkiWiki/Render.pm ikidev/IkiWiki/Render.pm
    --- ikiwiki/IkiWiki/Render.pm       2007-02-14 17:00:05.000000000 -0800
    +++ ikidev/IkiWiki/Render.pm        2007-02-22 18:30:00.451755000 -0800
    @@ -80,6 +80,7 @@

        if (length $config{cgiurl}) {
                $template->param(editurl => cgiurl(do => "edit", page => $page));
    +           $template->param(moveurl => cgiurl(do => "move", page => $page));
                $template->param(prefsurl => cgiurl(do => "prefs"));
                if ($config{rcs}) {
                        $template->param(recentchangesurl => cgiurl(do => "recentchanges"));
    diff -urNX ignorepats ikiwiki/templates/movepage.tmpl ikidev/templates/movepage.tmpl
    --- ikiwiki/templates/movepage.tmpl 1969-12-31 16:00:00.000000000 -0800
    +++ ikidev/templates/movepage.tmpl  2007-02-22 18:40:39.751763000 -0800
    @@ -0,0 +1,44 @@
    +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    + "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
    +<html>
    +<head>
    +<base href="<TMPL_VAR BASEURL>" />
    +<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    +<title><TMPL_VAR FORM-TITLE></title>
    +<link rel="stylesheet" href="<TMPL_VAR BASEURL>style.css" type="text/css" />
    +<link rel="stylesheet" href="<TMPL_VAR BASEURL>local.css" type="text/css" />
    +<TMPL_IF NAME="FAVICON">
    +<link rel="icon" href="<TMPL_VAR BASEURL><TMPL_VAR FAVICON>" type="image/x-icon" />
    +</TMPL_IF>
    +</head>
    +<body>
    +<TMPL_IF NAME="FAILED_SAVE">
    +<p>
    +<b>Failed to save your changes.</b>
    +</p>
    +<p>
    +Your changes were not able to be saved to disk. The system gave the error:
    +<blockquote>
    +<TMPL_VAR ERROR_MESSAGE>
    +</blockquote>
    +Your changes are preserved below, and you can try again to save them.
    +</p>
    +</TMPL_IF>
    +<TMPL_VAR FORM-START>
    +<div class="header">
    +<span><TMPL_VAR INDEXLINK>/ <TMPL_VAR FORM-TITLE></span>
    +</div>
    +<TMPL_VAR FIELD-DO>
    +<TMPL_VAR FIELD-FROM>
    +<TMPL_VAR FIELD-RCSINFO>
    +<TMPL_VAR FIELD-PAGE>
    +New location: <TMPL_VAR FIELD-NEWDIR>/ <TMPL_VAR FIELD-NEWNAME>
    +<br />
    +<TMPL_IF NAME="CAN_COMMIT">
    +Optional comment about this change:<br />
    +<TMPL_VAR FIELD-COMMENTS><br />
    +</TMPL_IF>
    +<input id="_submit" name="_submit" type="submit" value="Rename Page" /><input id="_submit_2" name="_submit" type="submit" value="Cancel" />
    +<TMPL_VAR FORM-END>
    +</body>
    +</html>
    diff -urNX ignorepats ikiwiki/templates/page.tmpl ikidev/templates/page.tmpl
    --- ikiwiki/templates/page.tmpl     2006-12-28 12:27:01.000000000 -0800
    +++ ikidev/templates/page.tmpl      2007-02-22 01:52:33.078464000 -0800
    @@ -32,6 +32,9 @@
     <TMPL_IF NAME="EDITURL">
     <li><a href="<TMPL_VAR EDITURL>">Edit</a></li>
     </TMPL_IF>
    +<TMPL_IF NAME="MOVEURL">
    +<li><a href="<TMPL_VAR MOVEURL>">Move</a></li>
    +</TMPL_IF>
     <TMPL_IF NAME="RECENTCHANGESURL">
     <li><a href="<TMPL_VAR RECENTCHANGESURL>">RecentChanges</a></li>
     </TMPL_IF>