path: root/IkiWiki/Plugin/svn.pm

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

use warnings;
use strict;
use IkiWiki;
use POSIX qw(setlocale LC_CTYPE);

sub import {
    hook(type => "checkconfig", id => "svn", call => \&checkconfig);
    hook(type => "getsetup", id => "svn", call => \&getsetup);
    hook(type => "rcs", id => "rcs_update", call => \&rcs_update);
    hook(type => "rcs", id => "rcs_prepedit", call => \&rcs_prepedit);
    hook(type => "rcs", id => "rcs_commit", call => \&rcs_commit);
    hook(type => "rcs", id => "rcs_commit_staged", call => \&rcs_commit_staged);
    hook(type => "rcs", id => "rcs_add", call => \&rcs_add);
    hook(type => "rcs", id => "rcs_remove", call => \&rcs_remove);
    hook(type => "rcs", id => "rcs_rename", call => \&rcs_rename);
    hook(type => "rcs", id => "rcs_recentchanges", call => \&rcs_recentchanges);
    hook(type => "rcs", id => "rcs_diff", call => \&rcs_diff);
    hook(type => "rcs", id => "rcs_getctime", call => \&rcs_getctime);
}

sub checkconfig () {
    if (! defined $config{svnpath}) {
        $config{svnpath}="trunk";
    }
    if (exists $config{svnpath}) {
        # code depends on the path not having extraneous slashes
        $config{svnpath}=~tr#/#/#s;
        $config{svnpath}=~s/\/$//;
        $config{svnpath}=~s/^\///;
    }
    if (defined $config{svn_wrapper} && length $config{svn_wrapper}) {
        push @{$config{wrappers}}, {
            wrapper => $config{svn_wrapper},
            wrappermode => (defined $config{svn_wrappermode} ? $config{svn_wrappermode} : "04755"),
        };
    }
}

sub getsetup () {
    return
        plugin => {
            safe => 0, # rcs plugin
            rebuild => undef,
            section => "rcs",
        },
        svnrepo => {
            type => "string",
            example => "/svn/wiki",
            description => "subversion repository location",
            safe => 0, # path
            rebuild => 0,
        },
        svnpath => {
            type => "string",
            example => "trunk",
            description => "path inside repository where the wiki is located",
            safe => 0, # paranoia
            rebuild => 0,
        },
        svn_wrapper => {
            type => "string",
            example => "/svn/wikirepo/hooks/post-commit",
            description => "svn post-commit hook to generate",
            safe => 0, # file
            rebuild => 0,
        },
        svn_wrappermode => {
            type => "string",
            example => '04755',
            description => "mode for svn_wrapper (can safely be made suid)",
            safe => 0,
            rebuild => 0,
        },
        historyurl => {
            type => "string",
            example => "http://svn.example.org/trunk/[[file]]",
            description => "viewvc url to show file history ([[file]] substituted)",
            safe => 1,
            rebuild => 1,
        },
        diffurl => {
            type => "string",
            example => "http://svn.example.org/trunk/[[file]]?root=wiki&r1=[[r1]]&r2=[[r2]]",
            description => "viewvc url to show a diff ([[file]], [[r1]], and [[r2]] substituted)",
            safe => 1,
            rebuild => 1,
        },
}

# svn needs LC_CTYPE set to a UTF-8 locale, so try to find one. Any will do.
sub find_lc_ctype() {
    my $current = setlocale(LC_CTYPE());
    return $current if $current =~ m/UTF-?8$/i;

    # Make some obvious attempts to avoid calling `locale -a`
    foreach my $locale ("$current.UTF-8", "en_US.UTF-8", "en_GB.UTF-8") {
        return $locale if setlocale(LC_CTYPE(), $locale);
    }

    # Try to get all available locales and pick the first UTF-8 one found.
    if (my @locale = grep(/UTF-?8$/i, `locale -a`)) {
        chomp @locale;
        return $locale[0] if setlocale(LC_CTYPE(), $locale[0]);
    }

    # fallback to the current locale
    return $current;
}
$ENV{LC_CTYPE} = $ENV{LC_CTYPE} || find_lc_ctype();

sub svn_info ($$) {
    my $field=shift;
    my $file=shift;

    my $info=`LANG=C svn info $file`;
    my ($ret)=$info=~/^$field: (.*)$/m;
    return $ret;
}

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

sub rcs_prepedit ($) {
    # Prepares to edit a file under revision control. Returns a token
    # that must be passed into rcs_commit when the file is ready
    # for committing.
    # The file is relative to the srcdir.
    my $file=shift;
    
    if (-d "$config{srcdir}/.svn") {
        # For subversion, return the revision of the file when
        # editing begins.
        my $rev=svn_info("Revision", "$config{srcdir}/$file");
        return defined $rev ? $rev : "";
    }
}

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.
    # The file is relative to the srcdir.
    my $file=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" : "");
    }

    if (-d "$config{srcdir}/.svn") {
        # Check to see if the page has been changed by someone
        # else since rcs_prepedit was called.
        my ($oldrev)=$rcstoken=~/^([0-9]+)$/; # untaint
        my $rev=svn_info("Revision", "$config{srcdir}/$file");
        if (defined $rev && defined $oldrev && $rev != $oldrev) {
            # Merge their changes into the file that we've
            # changed.
            if (system("svn", "merge", "--quiet", "-r$oldrev:$rev",
                       "$config{srcdir}/$file", "$config{srcdir}/$file") != 0) {
                warn("svn merge -r$oldrev:$rev failed\n");
            }
        }

        if (system("svn", "commit", "--quiet", 
                   "--encoding", "UTF-8", "-m",
                   IkiWiki::possibly_foolish_untaint($message),
               $config{srcdir}) != 0) {
            my $conflict=readfile("$config{srcdir}/$file");
            if (system("svn", "revert", "--quiet", "$config{srcdir}/$file") != 0) {
                warn("svn revert failed\n");
            }
            return $conflict;
        }
    }
    return undef # success
}

sub rcs_commit_staged ($$$) {
    # Commits all staged changes. Changes can be staged using rcs_add,
    # rcs_remove, and rcs_rename.
    my ($message, $user, $ipaddr)=@_;
    
    if (defined $user) {
        $message="web commit by $user".(length $message ? ": $message" : "");
    }
    elsif (defined $ipaddr) {
        $message="web commit from $ipaddr".(length $message ? ": $message" : "");
    }
    
    if (system("svn", "commit", "--quiet",
               "--encoding", "UTF-8", "-m",
               IkiWiki::possibly_foolish_untaint($message),
           $config{srcdir}) != 0) {
        warn("svn commit failed\n");
        return 1; # failure 
    }
    return undef # success
}

sub rcs_add ($) {
    # filename is relative to the root of the srcdir
    my $file=shift;

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

sub rcs_remove ($) {
    # filename is relative to the root of the srcdir
    my $file=shift;

    if (-d "$config{srcdir}/.svn") {
        if (system("svn", "rm", "--force", "--quiet", "$config{srcdir}/$file") != 0) {
            warn("svn rm failed\n");
        }
    }
}

sub rcs_rename ($$) {
    # filenames relative to the root of the srcdir
    my ($src, $dest)=@_;
    
    if (-d "$config{srcdir}/.svn") {
        # Add parent directory for $dest
        my $parent=IkiWiki::dirname($dest);
        if (! -d "$config{srcdir}/$parent/.svn") {
            while (! -d "$config{srcdir}/$parent/.svn") {
                $parent=IkiWiki::dirname($dest);
            }
            if (system("svn", "add", "--quiet", "$config{srcdir}/$parent") != 0) {
                warn("svn add $parent failed\n");
            }
        }

        if (system("svn", "mv", "--force", "--quiet", 
            "$config{srcdir}/$src", "$config{srcdir}/$dest") != 0) {
            warn("svn rename failed\n");
        }
    }
}

sub rcs_recentchanges ($) {
    my $num=shift;
    my @ret;
    
    return unless -d "$config{srcdir}/.svn";

    eval q{
        use Date::Parse;
        use XML::SAX;
        use XML::Simple;
    };
    error($@) if $@;

    # avoid using XML::SAX::PurePerl, it's buggy with UTF-8 data
    my @parsers = map { ${$_}{Name} } @{XML::SAX->parsers()};
    do {
        $XML::Simple::PREFERRED_PARSER = pop @parsers;
    } until $XML::Simple::PREFERRED_PARSER ne 'XML::SAX::PurePerl';

    # --limit is only supported on Subversion 1.2.0+
    my $svn_version=`svn --version -q`;
    my $svn_limit='';
    $svn_limit="--limit $num"
        if $svn_version =~ /\d\.(\d)\.\d/ && $1 >= 2;

    my $svn_url=svn_info("URL", $config{srcdir});
    my $xml = XMLin(scalar `svn $svn_limit --xml -v log '$svn_url'`,
        ForceArray => [ 'logentry', 'path' ],
        GroupTags => { paths => 'path' },
        KeyAttr => { path => 'content' },
    );
    foreach my $logentry (@{$xml->{logentry}}) {
        my (@pages, @message);

        my $rev = $logentry->{revision};
        my $user = $logentry->{author};

        my $when=str2time($logentry->{date}, 'UTC');

        foreach my $msgline (split(/\n/, $logentry->{msg})) {
            push @message, { line => $msgline };
        }

        my $committype="web";
        if (defined $message[0] &&
            $message[0]->{line}=~/$config{web_commit_regexp}/) {
            $user=defined $2 ? "$2" : "$3";
            $message[0]->{line}=$4;
        }
        else {
            $committype="svn";
        }

        foreach my $file (keys %{$logentry->{paths}}) {
            if (length $config{svnpath}) {
                next unless $file=~/^\/\Q$config{svnpath}\E\/([^ ]+)(?:$|\s)/;
                $file=$1;
            }

            my $diffurl=defined $config{diffurl} ? $config{diffurl} : "";
            $diffurl=~s/\[\[file\]\]/$file/g;
            $diffurl=~s/\[\[r1\]\]/$rev - 1/eg;
            $diffurl=~s/\[\[r2\]\]/$rev/g;

            push @pages, {
                page => pagename($file),
                diffurl => $diffurl,
            } if length $file;
        }
        push @ret, {
            rev => $rev,
            user => $user,
            committype => $committype,
            when => $when,
            message => [@message],
            pages => [@pages],
        } if @pages;
        return @ret if @ret >= $num;
    }

    return @ret;
}

sub rcs_diff ($) {
    my $rev=IkiWiki::possibly_foolish_untaint(int(shift));
    return `svnlook diff $config{svnrepo} -r$rev --no-diff-deleted`;
}

sub rcs_getctime ($) {
    my $file=shift;

    my $svn_log_infoline=qr/^r\d+\s+\|\s+[^\s]+\s+\|\s+(\d+-\d+-\d+\s+\d+:\d+:\d+\s+[-+]?\d+).*/;
        
    my $child = open(SVNLOG, "-|");
    if (! $child) {
        exec("svn", "log", $file) || error("svn log $file failed to run");
    }

    my $date;
    while (<SVNLOG>) {
        if (/$svn_log_infoline/) {
            $date=$1;
            }
    }
    close SVNLOG || warn "svn log $file exited $?";

    if (! defined $date) {
        warn "failed to parse svn log for $file\n";
        return 0;
    }
        
    eval q{use Date::Parse};
    error($@) if $@;
    $date=str2time($date);
    debug("found ctime ".localtime($date)." for $file");
    return $date;
}

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