+ if (%rendered || @del || @internal || @internal_change) {
+ my @changed=(keys %rendered, @del);
+ my @exists_changed=(@add, @del);
+
+ my %lc_changed = map { lc(pagename($_)) => 1 } @changed;
+ my %lc_exists_changed = map { lc(pagename($_)) => 1 } @exists_changed;
+
+ # rebuild dependant pages
+ foreach my $f (@$files) {
+ next if $rendered{$f};
+ my $p=pagename($f);
+ my $reason = undef;
+
+ if (exists $depends_simple{$p}) {
+ foreach my $d (keys %{$depends_simple{$p}}) {
+ if ($depends_simple{$p}{$d} == $IkiWiki::DEPEND_EXISTS) {
+ if (exists $lc_exists_changed{$d}) {
+ $reason = $d;
+ last;
+ }
+ }
+ elsif (exists $lc_changed{$d}) {
+ $reason = $d;
+ last;
+ }
+ }
+ }
+
+ if (exists $depends{$p} && ! defined $reason) {
+ D: foreach my $d (keys %{$depends{$p}}) {
+ my $sub=pagespec_translate($d);
+ next if $@ || ! defined $sub;
+
+ my @candidates;
+ if ($depends{$p}{$d} == $IkiWiki::DEPEND_EXISTS) {
+ @candidates=@exists_changed;
+ }
+ else {
+ @candidates=@changed;
+ }
+ # only consider internal files
+ # if the page explicitly depends
+ # on such files
+ if ($d =~ /internal\(/) {
+ if ($depends{$p}{$d} == $IkiWiki::DEPEND_EXISTS) {
+ push @candidates, @internal;
+ }
+ else {
+ push @candidates, @internal, @internal_change;
+ }
+ }
+
+ foreach my $file (@candidates) {
+ next if $file eq $f;
+ my $page=pagename($file);
+ if ($sub->($page, location => $p)) {
+ $reason = $page;
+ last D;
+ }
+ }
+ }
+ }
+
+ if (defined $reason) {
+ debug(sprintf(gettext("building %s, which depends on %s"), $f, $reason));
+ render($f);
+ $rendered{$f}=1;
+ }
+ }
+
+ # handle backlinks; if a page has added/removed links,
+ # update the pages it links to