gitweb: Restructure projects list generation

Extract filtering out forks (which is done if 'forks' feature is
enabled) into filter_forks_from_projects_list subroutine, and
searching projects (via projects search form, or via content tags)
into search_projects_list subroutine.

Both are now run _before_ displaying projects, and not while printing;
this allow to know upfront if there were any found projects.  Gitweb
now can and do print 'No such projects found' if user searches for
phrase which does not correspond to any project (any repository).
This also would allow splitting projects list into pages, if we so
desire.

Filtering out forks and marking repository (project) as having forks
is now consolidated into one subroutine (special case of handling
forks in git_get_projects_list only for $projects_list being file is
now removed).  Forks handling is also cleaned up and simplified.
$pr->{'forks'} now contains un-filled list of forks; we can now also
detect situation where the way for having forks is prepared, but there
are no forks yet.

Sorting projects got also refactored in a very straight way (just
moving code) into sort_projects_list subroutine.

The interaction between forks, content tags and searching is now made
more explicit: searching whether by tag, or via search form turns off
fork filtering (gitweb searches also forks, and will show all
results).  If 'ctags' feature is disabled, then searching by tag is
too.

The t9500 test now includes some basic test for 'forks' and 'ctags'
features; the t9502 includes test checking if gitweb correctly filters
out forks.

Generating list of projects by scanning given directory is now also a
bit simplified wrt. handling filtering; it is byproduct of extracting
filtering forks to separate subroutine.

While at it we now detect that there are no projects and respond with
"404 No projects found" also for 'project_index' and 'opml' actions.

Helped-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 173 insertions, 77 deletions

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index ee69ea683a..014b33b50a 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -2651,21 +2651,23 @@ sub git_get_project_url_list {
 }
 
 sub git_get_projects_list {
-	my ($filter) = @_;
+	my $filter = shift || '';
 	my @list;
 
-	$filter ||= '';
 	$filter =~ s/\.git$//;
 
-	my $check_forks = gitweb_check_feature('forks');
-
 	if (-d $projects_list) {
 		# search in directory
-		my $dir = $projects_list . ($filter ? "/$filter" : '');
+		my $dir = $projects_list;
 		# remove the trailing "/"
 		$dir =~ s!/+$!!;
-		my $pfxlen = length("$dir");
-		my $pfxdepth = ($dir =~ tr!/!!);
+		my $pfxlen = length("$projects_list");
+		my $pfxdepth = ($projects_list =~ tr!/!!);
+		# when filtering, search only given subdirectory
+		if ($filter) {
+			$dir .= "/$filter";
+			$dir =~ s!/+$!!;
+		}
 
 		File::Find::find({
 			follow_fast => 1, # follow symbolic links
@@ -2680,14 +2682,14 @@ sub git_get_projects_list {
 				# only directories can be git repositories
 				return unless (-d $_);
 				# don't traverse too deep (Find is super slow on os x)
+				# $project_maxdepth excludes depth of $projectroot
 				if (($File::Find::name =~ tr!/!!) - $pfxdepth > $project_maxdepth) {
 					$File::Find::prune = 1;
 					return;
 				}
 
-				my $subdir = substr($File::Find::name, $pfxlen + 1);
+				my $path = substr($File::Find::name, $pfxlen + 1);
 				# we check related file in $projectroot
-				my $path = ($filter ? "$filter/" : '') . $subdir;
 				if (check_export_ok("$projectroot/$path")) {
 					push @list, { path => $path };
 					$File::Find::prune = 1;
@@ -2700,7 +2702,6 @@ sub git_get_projects_list {
 		# 'git%2Fgit.git Linus+Torvalds'
 		# 'libs%2Fklibc%2Fklibc.git H.+Peter+Anvin'
 		# 'linux%2Fhotplug%2Fudev.git Greg+Kroah-Hartman'
-		my %paths;
 		open my $fd, '<', $projects_list or return;
 	PROJECT:
 		while (my $line = <$fd>) {
@@ -2711,32 +2712,9 @@ sub git_get_projects_list {
 			if (!defined $path) {
 				next;
 			}
-			if ($filter ne '') {
-				# looking for forks;
-				my $pfx = substr($path, 0, length($filter));
-				if ($pfx ne $filter) {
-					next PROJECT;
-				}
-				my $sfx = substr($path, length($filter));
-				if ($sfx !~ /^\/.*\.git$/) {
-					next PROJECT;
-				}
-			} elsif ($check_forks) {
-			PATH:
-				foreach my $filter (keys %paths) {
-					# looking for forks;
-					my $pfx = substr($path, 0, length($filter));
-					if ($pfx ne $filter) {
-						next PATH;
-					}
-					my $sfx = substr($path, length($filter));
-					if ($sfx !~ /^\/.*\.git$/) {
-						next PATH;
-					}
-					# is a fork, don't include it in
-					# the list
-					next PROJECT;
-				}
+			# if $filter is rpovided, check if $path begins with $filter
+			if ($filter && $path !~ m!^\Q$filter\E/!) {
+				next;
 			}
 			if (check_export_ok("$projectroot/$path")) {
 				my $pr = {
@@ -2744,8 +2722,6 @@ sub git_get_projects_list {
 					owner => to_utf8($owner),
 				};
 				push @list, $pr;
-				(my $forks_path = $path) =~ s/\.git$//;
-				$paths{$forks_path}++;
 			}
 		}
 		close $fd;
@@ -2753,6 +2729,98 @@ sub git_get_projects_list {
 	return @list;
 }
 
+# written with help of Tree::Trie module (Perl Artistic License, GPL compatibile)
+# as side effects it sets 'forks' field to list of forks for forked projects
+sub filter_forks_from_projects_list {
+	my $projects = shift;
+
+	my %trie; # prefix tree of directories (path components)
+	# generate trie out of those directories that might contain forks
+	foreach my $pr (@$projects) {
+		my $path = $pr->{'path'};
+		$path =~ s/\.git$//;      # forks of 'repo.git' are in 'repo/' directory
+		next if ($path =~ m!/$!); # skip non-bare repositories, e.g. 'repo/.git'
+		next unless ($path);      # skip '.git' repository: tests, git-instaweb
+		next unless (-d $path);   # containing directory exists
+		$pr->{'forks'} = [];      # there can be 0 or more forks of project
+
+		# add to trie
+		my @dirs = split('/', $path);
+		# walk the trie, until either runs out of components or out of trie
+		my $ref = \%trie;
+		while (scalar @dirs &&
+		       exists($ref->{$dirs[0]})) {
+			$ref = $ref->{shift @dirs};
+		}
+		# create rest of trie structure from rest of components
+		foreach my $dir (@dirs) {
+			$ref = $ref->{$dir} = {};
+		}
+		# create end marker, store $pr as a data
+		$ref->{''} = $pr if (!exists $ref->{''});
+	}
+
+	# filter out forks, by finding shortest prefix match for paths
+	my @filtered;
+ PROJECT:
+	foreach my $pr (@$projects) {
+		# trie lookup
+		my $ref = \%trie;
+	DIR:
+		foreach my $dir (split('/', $pr->{'path'})) {
+			if (exists $ref->{''}) {
+				# found [shortest] prefix, is a fork - skip it
+				push @{$ref->{''}{'forks'}}, $pr;
+				next PROJECT;
+			}
+			if (!exists $ref->{$dir}) {
+				# not in trie, cannot have prefix, not a fork
+				push @filtered, $pr;
+				next PROJECT;
+			}
+			# If the dir is there, we just walk one step down the trie.
+			$ref = $ref->{$dir};
+		}
+		# we ran out of trie
+		# (shouldn't happen: it's either no match, or end marker)
+		push @filtered, $pr;
+	}
+
+	return @filtered;
+}
+
+# note: fill_project_list_info must be run first,
+# for 'descr_long' and 'ctags' to be filled
+sub search_projects_list {
+	my ($projlist, %opts) = @_;
+	my $tagfilter  = $opts{'tagfilter'};
+	my $searchtext = $opts{'searchtext'};
+
+	return @$projlist
+		unless ($tagfilter || $searchtext);
+
+	my @projects;
+ PROJECT:
+	foreach my $pr (@$projlist) {
+
+		if ($tagfilter) {
+			next unless ref($pr->{'ctags'}) eq 'HASH';
+			next unless
+				grep { lc($_) eq lc($tagfilter) } keys %{$pr->{'ctags'}};
+		}
+
+		if ($searchtext) {
+			next unless
+				$pr->{'path'} =~ /$searchtext/ ||
+				$pr->{'descr_long'} =~ /$searchtext/;
+		}
+
+		push @projects, $pr;
+	}
+
+	return @projects;
+}
+
 our $gitweb_project_owner = undef;
 sub git_get_project_list_from_file {
 
@@ -4742,7 +4810,7 @@ sub git_patchset_body {
 # project in the list, removing invalid projects from returned list
 # NOTE: modifies $projlist, but does not remove entries from it
 sub fill_project_list_info {
-	my ($projlist, $check_forks) = @_;
+	my $projlist = shift;
 	my @projects;
 
 	my $show_ctags = gitweb_check_feature('ctags');
@@ -4762,23 +4830,36 @@ sub fill_project_list_info {
 		if (!defined $pr->{'owner'}) {
 			$pr->{'owner'} = git_get_project_owner("$pr->{'path'}") || "";
 		}
-		if ($check_forks) {
-			my $pname = $pr->{'path'};
-			if (($pname =~ s/\.git$//) &&
-			    ($pname !~ /\/$/) &&
-			    (-d "$projectroot/$pname")) {
-				$pr->{'forks'} = "-d $projectroot/$pname";
-			} else {
-				$pr->{'forks'} = 0;
-			}
+		if ($show_ctags) {
+			$pr->{'ctags'} = git_get_project_ctags($pr->{'path'});
 		}
-		$show_ctags and $pr->{'ctags'} = git_get_project_ctags($pr->{'path'});
 		push @projects, $pr;
 	}
 
 	return @projects;
 }
 
+sub sort_projects_list {
+	my ($projlist, $order) = @_;
+	my @projects;
+
+	my %order_info = (
+		project => { key => 'path', type => 'str' },
+		descr => { key => 'descr_long', type => 'str' },
+		owner => { key => 'owner', type => 'str' },
+		age => { key => 'age', type => 'num' }
+	);
+	my $oi = $order_info{$order};
+	return @$projlist unless defined $oi;
+	if ($oi->{'type'} eq 'str') {
+		@projects = sort {$a->{$oi->{'key'}} cmp $b->{$oi->{'key'}}} @$projlist;
+	} else {
+		@projects = sort {$a->{$oi->{'key'}} <=> $b->{$oi->{'key'}}} @$projlist;
+	}
+
+	return @projects;
+}
+
 # print 'sort by' <th> element, generating 'sort by $name' replay link
 # if that order is not selected
 sub print_sort_th {
@@ -4805,28 +4886,39 @@ sub format_sort_th {
 sub git_project_list_body {
 	# actually uses global variable $project
 	my ($projlist, $order, $from, $to, $extra, $no_header) = @_;
+	my @projects = @$projlist;
 
 	my $check_forks = gitweb_check_feature('forks');
-	my @projects = fill_project_list_info($projlist, $check_forks);
+	my $show_ctags  = gitweb_check_feature('ctags');
+	my $tagfilter = $show_ctags ? $cgi->param('by_tag') : undef;
+	$check_forks = undef
+		if ($tagfilter || $searchtext);
+
+	# filtering out forks before filling info allows to do less work
+	@projects = filter_forks_from_projects_list(\@projects)
+		if ($check_forks);
+	@projects = fill_project_list_info(\@projects);
+	# searching projects require filling to be run before it
+	@projects = search_projects_list(\@projects,
+	                                 'searchtext' => $searchtext,
+	                                 'tagfilter'  => $tagfilter)
+		if ($tagfilter || $searchtext);
 
 	$order ||= $default_projects_order;
 	$from = 0 unless defined $from;
 	$to = $#projects if (!defined $to || $#projects < $to);
 
-	my %order_info = (
-		project => { key => 'path', type => 'str' },
-		descr => { key => 'descr_long', type => 'str' },
-		owner => { key => 'owner', type => 'str' },
-		age => { key => 'age', type => 'num' }
-	);
-	my $oi = $order_info{$order};
-	if ($oi->{'type'} eq 'str') {
-		@projects = sort {$a->{$oi->{'key'}} cmp $b->{$oi->{'key'}}} @projects;
-	} else {
-		@projects = sort {$a->{$oi->{'key'}} <=> $b->{$oi->{'key'}}} @projects;
+	# short circuit
+	if ($from > $to) {
+		print "<center>\n".
+		      "<b>No such projects found</b><br />\n".
+		      "Click ".$cgi->a({-href=>href(project=>undef)},"here")." to view all projects<br />\n".
+		      "</center>\n<br />\n";
+		return;
 	}
 
-	my $show_ctags = gitweb_check_feature('ctags');
+	@projects = sort_projects_list(\@projects, $order);
+
 	if ($show_ctags) {
 		my %ctags;
 		foreach my $p (@projects) {
@@ -4852,32 +4944,26 @@ sub git_project_list_body {
 		      "</tr>\n";
 	}
 	my $alternate = 1;
-	my $tagfilter = $cgi->param('by_tag');
 	for (my $i = $from; $i <= $to; $i++) {
 		my $pr = $projects[$i];
 
-		next if $tagfilter and $show_ctags and not grep { lc $_ eq lc $tagfilter } keys %{$pr->{'ctags'}};
-		next if $searchtext and not $pr->{'path'} =~ /$searchtext/
-			and not $pr->{'descr_long'} =~ /$searchtext/;
-		# Weed out forks or non-matching entries of search
-		if ($check_forks) {
-			my $forkbase = $project; $forkbase ||= ''; $forkbase =~ s#\.git$#/#;
-			$forkbase="^$forkbase" if $forkbase;
-			next if not $searchtext and not $tagfilter and $show_ctags
-				and $pr->{'path'} =~ m#$forkbase.*/.*#; # regexp-safe
-		}
-
 		if ($alternate) {
 			print "<tr class=\"dark\">\n";
 		} else {
 			print "<tr class=\"light\">\n";
 		}
 		$alternate ^= 1;
+
 		if ($check_forks) {
 			print "<td>";
 			if ($pr->{'forks'}) {
-				print "<!-- $pr->{'forks'} -->\n";
-				print $cgi->a({-href => href(project=>$pr->{'path'}, action=>"forks")}, "+");
+				my $nforks = scalar @{$pr->{'forks'}};
+				if ($nforks > 0) {
+					print $cgi->a({-href => href(project=>$pr->{'path'}, action=>"forks"),
+					               -title => "$nforks forks"}, "+");
+				} else {
+					print $cgi->span({-title => "$nforks forks"}, "+");
+				}
 			}
 			print "</td>\n";
 		}
@@ -5357,7 +5443,10 @@ sub git_forks {
 }
 
 sub git_project_index {
-	my @projects = git_get_projects_list($project);
+	my @projects = git_get_projects_list();
+	if (!@projects) {
+		die_error(404, "No projects found");
+	}
 
 	print $cgi->header(
 		-type => 'text/plain',
@@ -5399,7 +5488,11 @@ sub git_summary {
 	my $check_forks = gitweb_check_feature('forks');
 
 	if ($check_forks) {
+		# find forks of a project
 		@forklist = git_get_projects_list($project);
+		# filter out forks of forks
+		@forklist = filter_forks_from_projects_list(\@forklist)
+			if (@forklist);
 	}
 
 	git_header_html();
@@ -7319,6 +7412,9 @@ sub git_atom {
 
 sub git_opml {
 	my @list = git_get_projects_list();
+	if (!@list) {
+		die_error(404, "No projects found");
+	}
 
 	print $cgi->header(
 		-type => 'text/xml',