media library: add support for sorting by mtime

src/mpdpp.cpp

@@ -21,6 +21,7 @@
 #include <cassert>
 #include <cstdlib>
 #include <algorithm>
+#include <map>
 
 #include "charset.h"
 #include "error.h"
@@ -1140,6 +1141,52 @@ StringList Connection::GetList(mpd_tag_type type)
 	return result;
 }
 
+TagMTimeList Connection::GetListMTime(mpd_tag_type type, bool get_mtime)
+{
+	TagMTimeList result;
+	if (!itsConnection)
+		return result;
+	assert(!isCommandsListEnabled);
+	GoBusy();
+
+	if (!get_mtime)
+	{
+		mpd_search_db_tags(itsConnection, type);
+		mpd_search_commit(itsConnection);
+		while (mpd_pair *item = mpd_recv_pair_tag(itsConnection, type))
+		{
+			result.push_back(TagMTime(item->value));
+			mpd_return_pair(itsConnection, item);
+		}
+		mpd_response_finish(itsConnection);
+	}
+	else
+	{
+		mpd_send_list_all_meta(itsConnection, "/");
+		std::map<std::string, time_t> max_mtimes;
+		while (mpd_song *s = mpd_recv_song(itsConnection))
+		{
+			Song song(s);
+			const std::string &tag = song.getTag(type);
+			time_t mtime = song.getMTime();
+			auto mt = max_mtimes.find(tag);
+			if (mt == max_mtimes.end())
+				max_mtimes.insert(std::make_pair(tag, mtime));
+			else
+				mt->second = std::max(mt->second, mtime);
+		}
+		mpd_response_finish(itsConnection);
+
+		for (auto it = max_mtimes.begin(); it != max_mtimes.end(); ++it)
+		{
+			result.push_back(TagMTime(it->first, it->second));
+		}
+	}
+
+	GoIdle();
+	return result;
+}
+
 void Connection::StartSearch(bool exact_match)
 {
 	if (itsConnection)
@@ -1154,6 +1201,18 @@ void Connection::StartFieldSearch(mpd_tag_type item)
 		mpd_search_db_tags(itsConnection, item);
 	}
 }
+void Connection::StartFieldSearchMTime(mpd_tag_type item, bool get_mtime)
+{
+	if (itsConnection)
+	{
+		itsSearchedField = item;
+		itsSearchFieldMTime = get_mtime;
+		if (!get_mtime)
+			mpd_search_db_tags(itsConnection, item);
+		else
+			mpd_search_db_songs(itsConnection, 1);
+	}
+}
 
 void Connection::AddSearch(mpd_tag_type item, const std::string &str) const
 {
@@ -1211,6 +1270,50 @@ StringList Connection::CommitSearchTags()
 	return result;
 }
 
+TagMTimeList Connection::CommitSearchTagsMTime()
+{
+	TagMTimeList result;
+	if (!itsConnection)
+		return result;
+
+	assert(!isCommandsListEnabled);
+	GoBusy();
+	mpd_search_commit(itsConnection);
+
+	if (!itsSearchFieldMTime)
+	{
+		while (mpd_pair *tag = mpd_recv_pair_tag(itsConnection, itsSearchedField))
+		{
+			result.push_back(TagMTime(tag->value));
+			mpd_return_pair(itsConnection, tag);
+		}
+	}
+	else
+	{
+		std::map<std::string, time_t> max_mtimes;
+		while (mpd_song *s = mpd_recv_song(itsConnection))
+		{
+			Song song(s);
+			const std::string &tag = song.getTag(itsSearchedField);
+			time_t mtime = song.getMTime();
+			auto mt = max_mtimes.find(tag);
+			if (mt == max_mtimes.end())
+				max_mtimes.insert(std::make_pair(tag, mtime));
+			else
+				mt->second = std::max(mt->second, mtime);
+		}
+
+		for (auto it = max_mtimes.begin(); it != max_mtimes.end(); ++it)
+		{
+			result.push_back(TagMTime(it->first, it->second));
+		}
+	}
+	mpd_response_finish(itsConnection);
+	GoIdle();
+
+	return result;
+}
+
 ItemList Connection::GetDirectory(const std::string &path)
 {
 	ItemList result;