fs/List: new library exporting ListWildcard()

Makefile.am

@@ -744,6 +744,7 @@ libfs_a_SOURCES = \
 	src/fs/FileSystem.cxx src/fs/FileSystem.hxx \
 	src/fs/FileInfo.hxx \
 	src/fs/Glob.hxx \
+	src/fs/List.cxx src/fs/List.hxx \
 	src/fs/StandardDirectory.cxx src/fs/StandardDirectory.hxx \
 	src/fs/CheckFile.cxx src/fs/CheckFile.hxx \
 	src/fs/DirectoryReader.cxx src/fs/DirectoryReader.hxx

src/fs/List.cxx

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2003-2017 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "List.hxx"
+#include "AllocatedPath.hxx"
+#include "Glob.hxx"
+
+#ifdef HAVE_CLASS_GLOB
+#include "DirectoryReader.hxx"
+
+#include <algorithm>
+#include <vector>
+#endif
+
+std::forward_list<AllocatedPath>
+ListWildcard(Path pattern)
+{
+#ifdef HAVE_CLASS_GLOB
+	const auto base = pattern.GetBase();
+	if (StringFindAny(base.c_str(), PATH_LITERAL("*?")) != nullptr) {
+		const Glob glob(base.ToUTF8Throw().c_str());
+
+		std::vector<AllocatedPath> v;
+		v.reserve(256);
+
+		const auto directory_path = pattern.GetDirectoryName();
+		DirectoryReader reader(directory_path);
+		while (reader.ReadEntry()) {
+			const Path name_fs = reader.GetEntry();
+
+			try {
+				if (glob.Check(name_fs.ToUTF8Throw().c_str()))
+					v.emplace_back(directory_path / name_fs);
+			} catch (...) {
+			}
+		}
+
+		// TODO: proper Unicode collation?
+		std::sort(v.begin(), v.end(),
+			  [](const Path a, const Path b){
+				  return StringCompare(a.c_str(), b.c_str()) < 0;
+			  });
+
+		return {v.begin(), v.end()};
+	}
+#endif
+
+	return {AllocatedPath(pattern)};
+}

src/fs/List.hxx

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2003-2017 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_FS_LIST_XX
+#define MPD_FS_LIST_XX
+
+#include "check.h"
+
+#include <forward_list>
+
+class Path;
+class AllocatedPath;
+
+/**
+ * Returns a sorted list of files matching the given pattern.
+ *
+ * Throws on error.
+ */
+std::forward_list<AllocatedPath>
+ListWildcard(Path pattern);
+
+#endif