gitweb: link to patch(es) view in commit(diff) and (short)log view

We link to patch view in commit and commitdiff view, and to patches view
in log and shortlog view.

In (short)log view, the link is only offered when the number of commits
shown is no more than the allowed maximum number of patches.

Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

gitweb/gitweb.perl

@@ -5023,6 +5023,15 @@ sub git_log {
 
 	my $paging_nav = format_paging_nav('log', $hash, $head, $page, $#commitlist >= 100);
 
+	my ($patch_max) = gitweb_get_feature('patches');
+	if ($patch_max) {
+		if ($patch_max < 0 || @commitlist <= $patch_max) {
+			$paging_nav .= " &sdot; " .
+				$cgi->a({-href => href(action=>"patches", -replay=>1)},
+					"patches");
+		}
+	}
+
 	git_header_html();
 	git_print_page_nav('log','', $hash,undef,undef, $paging_nav);
 
@@ -5102,6 +5111,11 @@ sub git_commit {
 			} @$parents ) .
 			')';
 	}
+	if (gitweb_check_feature('patches')) {
+		$formats_nav .= " | " .
+			$cgi->a({-href => href(action=>"patch", -replay=>1)},
+				"patch");
+	}
 
 	if (!defined $parent) {
 		$parent = "--root";
@@ -5415,9 +5429,8 @@ sub git_commitdiff {
 	my %params = @_;
 	my $format = $params{-format} || 'html';
 
-	my $patch_max;
+	my ($patch_max) = gitweb_get_feature('patches');
 	if ($format eq 'patch') {
-		($patch_max) = gitweb_get_feature('patches');
 		die_error(403, "Patch view not allowed") unless $patch_max;
 	}
 
@@ -5435,6 +5448,11 @@ sub git_commitdiff {
 		$formats_nav =
 			$cgi->a({-href => href(action=>"commitdiff_plain", -replay=>1)},
 			        "raw");
+		if ($patch_max) {
+			$formats_nav .= " | " .
+				$cgi->a({-href => href(action=>"patch", -replay=>1)},
+					"patch");
+		}
 
 		if (defined $hash_parent &&
 		    $hash_parent ne '-c' && $hash_parent ne '--cc') {
@@ -5991,6 +6009,14 @@ sub git_shortlog {
 			$cgi->a({-href => href(-replay=>1, page=>$page+1),
 			         -accesskey => "n", -title => "Alt-n"}, "next");
 	}
+	my $patch_max = gitweb_check_feature('patches');
+	if ($patch_max) {
+		if ($patch_max < 0 || @commitlist <= $patch_max) {
+			$paging_nav .= " &sdot; " .
+				$cgi->a({-href => href(action=>"patches", -replay=>1)},
+					"patches");
+		}
+	}
 
 	git_header_html();
 	git_print_page_nav('shortlog','', $hash,$hash,$hash, $paging_nav);