path: root/ikiwiki

#!/usr/bin/perl -T

use warnings;
use strict;
use File::Find;
use Memoize;
use File::Spec;
use HTML::Template;

BEGIN {
    $blosxom::version="is a proper perl module too much to ask?";
    do "/usr/bin/markdown";
}

$ENV{PATH}="/usr/local/bin:/usr/bin:/bin";
my ($srcdir, $templatedir, $destdir, %links, %oldlinks, %oldpagemtime,
    %renderedfiles, %pagesources);
my $wiki_link_regexp=qr/\[\[([^\s]+)\]\]/;
my $wiki_file_regexp=qr/(^[-A-Za-z0-9_.:\/+]+$)/;
my $wiki_file_prune_regexp=qr!((^|/).svn/|\.\.|^\.|\/\.|\.html?$)!;
my $verbose=0;
my $wikiname="wiki";
my $default_pagetype=".mdwn";
my $cgi=0;
my $url="";
my $cgiurl="";
my $historyurl="";
my $svn=1;
my $anonok=0;

sub usage { #{{{
    die "usage: ikiwiki [options] source templates dest\n";
} #}}}

sub error ($) { #{{{
    if ($cgi) {
        print "Content-type: text/html\n\n";
        print misctemplate("Error", "<p>Error: @_</p>");
        exit 1;
    }
    else {
        die @_;
    }
} #}}}

sub debug ($) { #{{{
    if (! $cgi) {
        print "@_\n" if $verbose;
    }
    else {
        print STDERR "@_\n" if $verbose;
    }
} #}}}

sub mtime ($) { #{{{
    my $page=shift;
    
    return (stat($page))[9];
} #}}}

sub possibly_foolish_untaint ($) { #{{{
    my $tainted=shift;
    my ($untainted)=$tainted=~/(.*)/;
    return $untainted;
} #}}}

sub basename ($) { #{{{
    my $file=shift;

    $file=~s!.*/!!;
    return $file;
} #}}}

sub dirname ($) { #{{{
    my $file=shift;

    $file=~s!/?[^/]+$!!;
    return $file;
} #}}}

sub pagetype ($) { #{{{
    my $page=shift;
    
    if ($page =~ /\.mdwn$/) {
        return ".mdwn";
    }
    else {
        return "unknown";
    }
} #}}}

sub pagename ($) { #{{{
    my $file=shift;

    my $type=pagetype($file);
    my $page=$file;
    $page=~s/\Q$type\E*$// unless $type eq 'unknown';
    return $page;
} #}}}

sub htmlpage ($) { #{{{
    my $page=shift;

    return $page.".html";
} #}}}

sub readfile ($) { #{{{
    my $file=shift;

    local $/=undef;
    open (IN, "$file") || error("failed to read $file: $!");
    my $ret=<IN>;
    close IN;
    return $ret;
} #}}}

sub writefile ($$) { #{{{
    my $file=shift;
    my $content=shift;

    my $dir=dirname($file);
    if (! -d $dir) {
        my $d="";
        foreach my $s (split(m!/+!, $dir)) {
            $d.="$s/";
            if (! -d $d) {
                mkdir($d) || error("failed to create directory $d: $!");
            }
        }
    }
    
    open (OUT, ">$file") || error("failed to write $file: $!");
    print OUT $content;
    close OUT;
} #}}}

sub findlinks ($) { #{{{
    my $content=shift;

    my @links;
    while ($content =~ /$wiki_link_regexp/g) {
        push @links, lc($1);
    }
    return @links;
} #}}}

# Given a page and the text of a link on the page, determine which existing
# page that link best points to. Prefers pages under a subdirectory with
# the same name as the source page, failing that goes down the directory tree
# to the base looking for matching pages.
sub bestlink ($$) { #{{{
    my $page=shift;
    my $link=lc(shift);
    
    my $cwd=$page;
    do {
        my $l=$cwd;
        $l.="/" if length $l;
        $l.=$link;

        if (exists $links{$l}) {
            #debug("for $page, \"$link\", use $l");
            return $l;
        }
    } while $cwd=~s!/?[^/]+$!!;

    #print STDERR "warning: page $page, broken link: $link\n";
    return "";
} #}}}

sub isinlinableimage ($) { #{{{
    my $file=shift;
    
    $file=~/\.(png|gif|jpg|jpeg)$/;
} #}}}

sub htmllink { #{{{
    my $page=shift;
    my $link=shift;
    my $noimagelink=shift;

    my $bestlink=bestlink($page, $link);

    return $link if $page eq $bestlink;
    
    # TODO BUG: %renderedfiles may not have it, if the linked to page
    # was also added and isn't yet rendered! Note that this bug is
    # masked by the bug mentioned below that makes all new files
    # be rendered twice.
    if (! grep { $_ eq $bestlink } values %renderedfiles) {
        $bestlink=htmlpage($bestlink);
    }
    if (! grep { $_ eq $bestlink } values %renderedfiles) {
        return "<a href=\"$cgiurl?do=create&page=$link&from=$page\">?</a>$link"
    }
    
    $bestlink=File::Spec->abs2rel($bestlink, dirname($page));
    
    if (! $noimagelink && isinlinableimage($bestlink)) {
        return "<img src=\"$bestlink\">";
    }
    return "<a href=\"$bestlink\">$link</a>";
} #}}}

sub linkify ($$) { #{{{
    my $content=shift;
    my $file=shift;

    $content =~ s/$wiki_link_regexp/htmllink(pagename($file), $1)/eg;
    
    return $content;
} #}}}

sub htmlize ($$) { #{{{
    my $type=shift;
    my $content=shift;
    
    if ($type eq '.mdwn') {
        return Markdown::Markdown($content);
    }
    else {
        error("htmlization of $type not supported");
    }
} #}}}

sub backlinks ($) { #{{{
    my $page=shift;

    my @links;
    foreach my $p (keys %links) {
        next if bestlink($page, $p) eq $page;
        if (grep { length $_ && bestlink($p, $_) eq $page } @{$links{$p}}) {
            my $href=File::Spec->abs2rel(htmlpage($p), dirname($page));
            
            # Trim common dir prefixes from both pages.
            my $p_trimmed=$p;
            my $page_trimmed=$page;
            my $dir;
            1 while (($dir)=$page_trimmed=~m!^([^/]+/)!) &&
                    defined $dir &&
                    $p_trimmed=~s/^\Q$dir\E// &&
                    $page_trimmed=~s/^\Q$dir\E//;
                       
            push @links, { url => $href, page => $p_trimmed };
        }
    }

    return sort { $a->{page} cmp $b->{page} } @links;
} #}}}
    
sub parentlinks ($) { #{{{
    my $page=shift;
    
    my @ret;
    my $pagelink="";
    my $path="";
    my $skip=1;
    foreach my $dir (reverse split("/", $page)) {
        if (! $skip) {
            unshift @ret, { url => "$path$dir.html", page => $dir };
        }
        else {
            $skip=0;
        }
        $path.="../";
    }
    unshift @ret, { url => $path , page => $wikiname };
    return @ret;
} #}}}

sub indexlink () { #{{{
    return "<a href=\"$url\">$wikiname</a>";
} #}}}
    
sub finalize ($$) { #{{{
    my $content=shift;
    my $page=shift;

    my $title=basename($page);
    $title=~s/_/ /g;
    
    my $template=HTML::Template->new(blind_cache => 1,
        filename => "$templatedir/page.tmpl");
    
    if (length $cgiurl) {
        $template->param(editurl => "$cgiurl?do=edit&page=$page");
        if ($svn) {
            $template->param(recentchangesurl => "$cgiurl?do=recentchanges");
        }
    }

    if (length $historyurl) {
        my $u=$historyurl;
        $u=~s/\[\[\]\]/$pagesources{$page}/g;
        $template->param(historyurl => $u);
    }
    
    $template->param(
        title => $title,
        wikiname => $wikiname,
        parentlinks => [parentlinks($page)],
        content => $content,
        backlinks => [backlinks($page)],
    );
    
    return $template->output;
} #}}}

# Important security check. Make sure to call this before saving any files
# to the source directory.
sub check_overwrite ($$) { #{{{
    my $dest=shift;
    my $src=shift;
    
    if (! exists $renderedfiles{$src} && -e $dest) {
        error("$dest exists and was not rendered from $src before, not overwriting");
    }
} #}}}
        
sub render ($) { #{{{
    my $file=shift;
    
    my $type=pagetype($file);
    my $content=readfile("$srcdir/$file");
    if ($type ne 'unknown') {
        my $page=pagename($file);
        
        $links{$page}=[findlinks($content)];
        
        $content=linkify($content, $file);
        $content=htmlize($type, $content);
        $content=finalize($content, $page);
        
        check_overwrite("$destdir/".htmlpage($page), $page);
        writefile("$destdir/".htmlpage($page), $content);
        $oldpagemtime{$page}=time;
        $renderedfiles{$page}=htmlpage($page);
    }
    else {
        $links{$file}=[];
        check_overwrite("$destdir/$file", $file);
        writefile("$destdir/$file", $content);
        $oldpagemtime{$file}=time;
        $renderedfiles{$file}=$file;
    }
} #}}}

sub loadindex () { #{{{
    open (IN, "$srcdir/.ikiwiki/index") || return;
    while (<IN>) {
        $_=possibly_foolish_untaint($_);
        chomp;
        my ($mtime, $file, $rendered, @links)=split(' ', $_);
        my $page=pagename($file);
        $pagesources{$page}=$file;
        $oldpagemtime{$page}=$mtime;
        $oldlinks{$page}=[@links];
        $links{$page}=[@links];
        $renderedfiles{$page}=$rendered;
    }
    close IN;
} #}}}

sub saveindex () { #{{{
    if (! -d "$srcdir/.ikiwiki") {
        mkdir("$srcdir/.ikiwiki");
    }
    open (OUT, ">$srcdir/.ikiwiki/index") || error("cannot write to index: $!");
    foreach my $page (keys %oldpagemtime) {
        print OUT "$oldpagemtime{$page} $pagesources{$page} $renderedfiles{$page} ".
                join(" ", @{$links{$page}})."\n"
                if $oldpagemtime{$page};
    }
    close OUT;
} #}}}

sub rcs_update () { #{{{
    if (-d "$srcdir/.svn") {
        if (system("svn", "update", "--quiet", $srcdir) != 0) {
            warn("svn update failed\n");
        }
    }
} #}}}

sub rcs_commit ($) { #{{{
    my $message=shift;

    if (-d "$srcdir/.svn") {
        if (system("svn", "commit", "--quiet", "-m",
                   possibly_foolish_untaint($message), $srcdir) != 0) {
            warn("svn commit failed\n");
        }
    }
} #}}}

sub rcs_add ($) { #{{{
    my $file=shift;

    if (-d "$srcdir/.svn") {
        my $parent=dirname($file);
        while (! -d "$srcdir/$parent/.svn") {
            $file=$parent;
            $parent=dirname($file);
        }
        
        if (system("svn", "add", "--quiet", "$srcdir/$file") != 0) {
            warn("svn add failed\n");
        }
    }
} #}}}

sub rcs_recentchanges ($) { #{{{
    my $num=shift;
    my @ret;
    
    eval q{use Date::Parse};
    eval q{use Time::Duration};
    
    if (-d "$srcdir/.svn") {
        my $info=`LANG=C svn info $srcdir`;
        my ($svn_url)=$info=~/^URL: (.*)$/m;

        # FIXME: currently assumes that the wiki is somewhere
        # under trunk in svn, doesn't support other layouts.
        my ($svn_base)=$svn_url=~m!(/trunk(?:/.*)?)$!;
        
        my $div=qr/^--------------------+$/;
        my $infoline=qr/^r(\d+)\s+\|\s+([^\s]+)\s+\|\s+(\d+-\d+-\d+\s+\d+:\d+:\d+\s+[-+]?\d+).*/;
        my $state='start';
        my ($rev, $user, $when, @pages, @message);
        foreach (`LANG=C svn log -v '$svn_url'`) {
            chomp;
            if ($state eq 'start' && /$div/) {
                $state='header';
            }
            elsif ($state eq 'header' && /$infoline/) {
                $rev=$1;
                $user=$2;
                $when=concise(ago(time - str2time($3)));
                }
            elsif ($state eq 'header' && /^\s+[A-Z]\s+\Q$svn_base\E\/(.+)$/) {
                push @pages, { link => htmllink("", pagename($1), 1) }
                    if length $1;
            }
            elsif ($state eq 'header' && /^$/) {
                $state='body';
            }
            elsif ($state eq 'body' && /$div/) {
                push @ret, { rev => $rev, user => $user,
                    when => $when, message => [@message],
                    pages => [@pages] } if @pages;
                return @ret if @ret >= $num;
                
                $state='header';
                $rev=$user=$when=undef;
                @pages=@message=();
            }
            elsif ($state eq 'body') {
                push @message, {line => $_},
            }
        }
    }

    return @ret;
} #}}}

sub prune ($) { #{{{
    my $file=shift;

    unlink($file);
    my $dir=dirname($file);
    while (rmdir($dir)) {
        $dir=dirname($dir);
    }
} #}}}

sub refresh () { #{{{
    # Find existing pages.
    my %exists;
    my @files;
    find({
        no_chdir => 1,
        wanted => sub {
            if (/$wiki_file_prune_regexp/) {
                $File::Find::prune=1;
            }
            elsif (! -d $_) {
                my ($f)=/$wiki_file_regexp/; # untaint
                if (! defined $f) {
                    warn("skipping bad filename $_\n");
                }
                else {
                    $f=~s/^\Q$srcdir\E\/?//;
                    push @files, $f;
                    $exists{pagename($f)}=1;
                }
            }
        },
    }, $srcdir);

    my %rendered;

    # check for added or removed pages
    my @add;
    foreach my $file (@files) {
        my $page=pagename($file);
        if (! $oldpagemtime{$page}) {
            debug("new page $page");
            push @add, $file;
            $links{$page}=[];
            $pagesources{$page}=$file;
        }
    }
    my @del;
    foreach my $page (keys %oldpagemtime) {
        if (! $exists{$page}) {
            debug("removing old page $page");
            push @del, $renderedfiles{$page};
            prune($destdir."/".$renderedfiles{$page});
            delete $renderedfiles{$page};
            $oldpagemtime{$page}=0;
            delete $pagesources{$page};
        }
    }
    
    # render any updated files
    foreach my $file (@files) {
        my $page=pagename($file);
        
        if (! exists $oldpagemtime{$page} ||
            mtime("$srcdir/$file") > $oldpagemtime{$page}) {
                debug("rendering changed file $file");
            render($file);
            $rendered{$file}=1;
        }
    }
    
    # if any files were added or removed, check to see if each page
    # needs an update due to linking to them
    # TODO: inefficient; pages may get rendered above and again here;
    # problem is the bestlink may have changed and we won't know until
    # now
    if (@add || @del) {
FILE:       foreach my $file (@files) {
            my $page=pagename($file);
            foreach my $f (@add, @del) {
                my $p=pagename($f);
                foreach my $link (@{$links{$page}}) {
                    if (bestlink($page, $link) eq $p) {
                        debug("rendering $file, which links to $p");
                        render($file);
                        $rendered{$file}=1;
                        next FILE;
                    }
                }
            }
        }
    }

    # handle backlinks; if a page has added/removed links, update the
    # pages it links to
    # TODO: inefficient; pages may get rendered above and again here;
    # problem is the backlinks could be wrong in the first pass render
    # above
    if (%rendered) {
        my %linkchanged;
        foreach my $file (keys %rendered, @del) {
            my $page=pagename($file);
            if (exists $links{$page}) {
                foreach my $link (@{$links{$page}}) {
                    $link=bestlink($page, $link);
                    if (length $link &&
                        ! exists $oldlinks{$page} ||
                        ! grep { $_ eq $link } @{$oldlinks{$page}}) {
                        $linkchanged{$link}=1;
                    }
                }
            }
            if (exists $oldlinks{$page}) {
                foreach my $link (@{$oldlinks{$page}}) {
                    $link=bestlink($page, $link);
                    if (length $link &&
                        ! exists $links{$page} ||
                        ! grep { $_ eq $link } @{$links{$page}}) {
                        $linkchanged{$link}=1;
                    }
                }
            }
        }
        foreach my $link (keys %linkchanged) {
                my $linkfile=$pagesources{$link};
            if (defined $linkfile) {
                debug("rendering $linkfile, to update its backlinks");
                render($linkfile);
            }
        }
    }
} #}}}

# Generates a C wrapper program for running ikiwiki in a specific way.
# The wrapper may be safely made suid.
sub gen_wrapper ($$) { #{{{
    my ($svn, $rebuild)=@_;

    eval q{use Cwd 'abs_path'};
    $srcdir=abs_path($srcdir);
    $destdir=abs_path($destdir);
    my $this=abs_path($0);
    if (! -x $this) {
        error("$this doesn't seem to be executable");
    }

    my @params=($srcdir, $templatedir, $destdir, "--wikiname=$wikiname");
    push @params, "--verbose" if $verbose;
    push @params, "--rebuild" if $rebuild;
    push @params, "--nosvn" if !$svn;
    push @params, "--cgi" if $cgi;
    push @params, "--url=$url" if $url;
    push @params, "--cgiurl=$cgiurl" if $cgiurl;
    push @params, "--historyurl=$historyurl" if $historyurl;
    push @params, "--anonok" if $anonok;
    my $params=join(" ", @params);
    my $call='';
    foreach my $p ($this, $this, @params) {
        $call.=qq{"$p", };
    }
    $call.="NULL";
    
    my @envsave;
    push @envsave, qw{REMOTE_ADDR QUERY_STRING REQUEST_METHOD REQUEST_URI
                   CONTENT_TYPE CONTENT_LENGTH GATEWAY_INTERFACE
               HTTP_COOKIE} if $cgi;
    my $envsave="";
    foreach my $var (@envsave) {
        $envsave.=<<"EOF"
    if ((s=getenv("$var")))
        asprintf(&newenviron[i++], "%s=%s", "$var", s);
EOF
    }
    
    open(OUT, ">ikiwiki-wrap.c") || error("failed to write ikiwiki-wrap.c: $!");;
    print OUT <<"EOF";
/* A wrapper for ikiwiki, can be safely made suid. */
#define _GNU_SOURCE
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

extern char **environ;

int main (int argc, char **argv) {
    /* Sanitize environment. */
    char *s;
    char *newenviron[$#envsave+3];
    int i=0;
$envsave
    newenviron[i++]="HOME=$ENV{HOME}";
    newenviron[i]=NULL;
    environ=newenviron;

    if (argc == 2 && strcmp(argv[1], "--params") == 0) {
        printf("$params\\n");
        exit(0);
    }
    
    execl($call);
    perror("failed to run $this");
    exit(1);
}
EOF
    close OUT;
    if (system("gcc", "ikiwiki-wrap.c", "-o", "ikiwiki-wrap") != 0) {
        error("failed to compile ikiwiki-wrap.c");
    }
    unlink("ikiwiki-wrap.c");
    print "successfully generated ikiwiki-wrap\n";
    exit 0;
} #}}}
        
sub misctemplate ($$) { #{{{
    my $title=shift;
    my $pagebody=shift;
    
    my $template=HTML::Template->new(
        filename => "$templatedir/misc.tmpl"
    );
    $template->param(
        title => $title,
        indexlink => indexlink(),
        wikiname => $wikiname,
        pagebody => $pagebody,
    );
    return $template->output;
}#}}}

sub cgi_recentchanges ($) { #{{{
    my $q=shift;
    
    my $template=HTML::Template->new(
        filename => "$templatedir/recentchanges.tmpl"
    );
    $template->param(
        title => "RecentChanges",
        indexlink => indexlink(),
        wikiname => $wikiname,
        changelog => [rcs_recentchanges(100)],
    );
    print $q->header, $template->output;
} #}}}

sub cgi_signin ($$) { #{{{
    my $q=shift;
    my $session=shift;

    eval q{use CGI::FormBuilder};
    my $form = CGI::FormBuilder->new(
        title => "$wikiname signin",
        fields => [qw(do page name password confirm_password email)],
        header => 1,
        method => 'POST',
        validate => {
            name => '/^\w+$/',
            confirm_password => {
                perl => q{eq $form->field("password")},
            },
            email => 'EMAIL',
        },
        required => 'NONE',
        javascript => 0,
        params => $q,
        action => $q->request_uri,
        header => 0,
        template => (-e "$templatedir/signin.tmpl" ? "$templatedir/signin.tmpl" : "")
    );
    
    $form->field(name => "name", required => 0);
    $form->field(name => "do", type => "hidden");
    $form->field(name => "page", type => "hidden");
    $form->field(name => "password", type => "password", required => 0);
    $form->field(name => "confirm_password", type => "password", required => 0);
    $form->field(name => "email", required => 0);
    if ($session->param("name")) {
        $form->field(name => "name", value => $session->param("name"));
    }
    if ($q->param("do") ne "signin") {
        $form->text("You need to log in before you can edit pages.");
    }
    
    if ($form->submitted) {
        # Set required fields based on how form was submitted.
        my %required=(
            "Login" => [qw(name password)],
            "Register" => [qw(name password confirm_password email)],
            "Mail Password" => [qw(name)],
        );
        foreach my $opt (@{$required{$form->submitted}}) {
            $form->field(name => $opt, required => 1);
        }
    
        # Validate password differently depending on how form was
        # submitted.
        if ($form->submitted eq 'Login') {
            $form->field(
                name => "password",
                validate => sub {
                    # TODO get real user password
                    shift eq "foo";
                },
            );
        }
        else {
            $form->field(name => "password", validate => 'VALUE');
        }
    }
    else {
        # Comments only shown first time.
        $form->field(name => "name", comment => "use FirstnameLastName");
        $form->field(name => "confirm_password", comment => "(only needed");
        $form->field(name => "email",            comment => "for registration)");
    }

    if ($form->submitted && $form->validate) {
        if ($form->submitted eq 'Login') {
            $session->param("name", $form->field("name"));
            if (defined $form->field("do") && 
                $form->field("do") ne 'signin') {
                print $q->redirect(
                    "$cgiurl?do=".$form->field("do").
                    "&page=".$form->field("page"));
            }
            else {
                print $q->redirect($url);
            }
        }
        elsif ($form->submitted eq 'Register') {
            # TODO: save registration info
            $form->field(name => "confirm_password", type => "hidden");
            $form->field(name => "email", type => "hidden");
            $form->text("Registration successful. Now you can Login.");
            print $session->header();
            print misctemplate($form->title, $form->render(submit => ["Login"]));
        }
        elsif ($form->submitted eq 'Mail Password') {
            # TODO mail password
            $form->text("Your password has been emailed to you.");
            print $session->header();
            print misctemplate($form->title, $form->render(submit => ["Login", "Register", "Mail Password"]));
        }
    }
    else {
        print $session->header();
        print misctemplate($form->title, $form->render(submit => ["Login", "Register", "Mail Password"]));
    }
} #}}}

sub cgi_editpage ($$) { #{{{
    my $q=shift;
    my $session=shift;

    eval q{use CGI::FormBuilder};
    my $form = CGI::FormBuilder->new(
        fields => [qw(do from page content comments)],
        header => 1,
        method => 'POST',
        validate => {},
        required => [qw{}],
        javascript => 0,
        params => $q,
        action => $q->request_uri,
        table => 0,
        template => "$templatedir/editpage.tmpl"
    );
    
    my ($page)=$form->param('page')=~/$wiki_file_regexp/;
    if (! defined $page || ! length $page || $page ne $q->param('page') ||
        $page=~/$wiki_file_prune_regexp/ || $page=~/^\//) {
        error("bad page name");
    }
    $page=lc($page);

    $form->field(name => "do", type => 'hidden');
    $form->field(name => "from", type => 'hidden');
    $form->field(name => "page", value => "$page", force => 1);
    $form->field(name => "comments", type => "text", size => 80);
    $form->field(name => "content", type => "textarea", rows => 20,
        cols => 80);
    
    if (! $form->submitted || ! $form->validate) {
        if ($form->field("do") eq "create") {
            if (exists $pagesources{lc($page)}) {
                # hmm, someone else made the page in the
                # meantime?
                print $q->redirect("$url/".htmlpage($page));
                return;
            }
            
            my @page_locs;
            my ($from)=$form->param('from')=~/$wiki_file_regexp/;
            if (! defined $from || ! length $from ||
                $from ne $form->param('from') ||
                $from=~/$wiki_file_prune_regexp/ || $from=~/^\//) {
                @page_locs=$page;
            }
            else {
                my $dir=$from."/";
                $dir=~s![^/]+/$!!;
                push @page_locs, $dir.$page;
                push @page_locs, "$from/$page";
                while (length $dir) {
                    $dir=~s![^/]+/$!!;
                    push @page_locs, $dir.$page;
                }
            }

            $form->tmpl_param("page_select", 1);
            $form->field(name => "page", type => 'select',
                options => \@page_locs);
            $form->title("creating $page");
        }
        elsif ($form->field("do") eq "edit") {
            my $content="";
            if (exists $pagesources{lc($page)}) {
                $content=readfile("$srcdir/$pagesources{lc($page)}");
                $content=~s/\n/\r\n/g;
            }
            $form->tmpl_param("page_select", 0);
            $form->field(name => "content", value => $content,
                force => 1);
            $form->field(name => "page", type => 'hidden');
            $form->title("editing $page");
        }
        
        $form->tmpl_param("can_commit", $svn);
        $form->tmpl_param("indexlink", indexlink());
        print $form->render(submit => ["Save Page"]);
    }
    else {
        # save page
        my $file=$page.$default_pagetype;
        my $newfile=1;
        if (exists $pagesources{lc($page)}) {
            $file=$pagesources{lc($page)};
            $newfile=0;
        }
        
        my $content=$form->field('content');
        $content=~s/\r\n/\n/g;
        $content=~s/\r/\n/g;
        writefile("$srcdir/$file", $content);
        
        my $message="web commit ";
        if ($session->param("name")) {
            $message.="by ".$session->param("name");
        }
        else {
            $message.="from $ENV{REMOTE_ADDR}";
        }
        if (length $form->field('comments')) {
            $message.=": ".$form->field('comments');
        }
        
        if ($svn) {
            if ($newfile) {
                rcs_add($file);
            }
            # presumably the commit will trigger an update
            # of the wiki
            rcs_commit($message);
        }
        else {
            refresh();
        }
        
        print $q->redirect("$url/".htmlpage($page));
    }
} #}}}

sub cgi () { #{{{
    eval q{use CGI};
    eval q{use CGI::Session};
    
    my $q=CGI->new;
    
    my $do=$q->param('do');
    if (! defined $do || ! length $do) {
        error("\"do\" parameter missing");
    }
    
    # This does not need a session.
    if ($do eq 'recentchanges') {
        cgi_recentchanges($q);
        return;
    }
    
    CGI::Session->name("ikiwiki_session");

    my $oldmask=umask(077);
    my $session = CGI::Session->new("driver:db_file", $q,
        { FileName => "$srcdir/.ikiwiki/sessions.db" });
    umask($oldmask);
    
    # Everything below this point needs the user to be signed in.
    if ((! $anonok && ! defined $session->param("name")) || $do eq 'signin') {
        cgi_signin($q, $session);
    
        # Force session flush with safe umask.
        my $oldmask=umask(077);
        $session->flush;
        umask($oldmask);
        
        return;
    }
    
    if ($do eq 'create' || $do eq 'edit') {
        cgi_editpage($q, $session);
    }
    else {
        error("unknown do parameter");
    }
} #}}}

# main {{{
my $rebuild=0;
my $wrapper=0;
if (grep /^-/, @ARGV) {
    eval {use Getopt::Long};
    GetOptions(
        "wikiname=s" => \$wikiname,
        "verbose|v" => \$verbose,
        "rebuild" => \$rebuild,
        "wrapper" => \$wrapper,
        "svn!" => \$svn,
        "anonok!" => \$anonok,
        "cgi" => \$cgi,
        "url=s" => \$url,
        "cgiurl=s" => \$cgiurl,
        "historyurl=s" => \$historyurl,
    ) || usage();
}
usage() unless @ARGV == 3;
($srcdir) = possibly_foolish_untaint(shift);
($templatedir) = possibly_foolish_untaint(shift);
($destdir) = possibly_foolish_untaint(shift);

if ($cgi && ! length $url) {
    error("Must specify url to wiki with --url when using --cgi");
}

gen_wrapper($svn, $rebuild) if $wrapper;
memoize('pagename');
memoize('bestlink');
loadindex() unless $rebuild;
if ($cgi) {
    cgi();
}
else {
    rcs_update() if $svn;
    refresh();
    saveindex();
}
#}}}