Add "added-since" filter expression

NEWS

@@ -11,6 +11,7 @@ ver 0.24 (not yet released)
   - apply Unicode normalization to case-insensitive filter expressions
   - stickers on playlists and some tag types
   - new command "stickernames"
+  - new "search"/"find" filter "added-since"
 * database
   - attribute "added" shows when each song was added to the database
   - proxy: require MPD 0.21 or later

src/song/AddedSinceSongFilter.cxx

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// Copyright The Music Player Daemon Project
+
+#include "AddedSinceSongFilter.hxx"
+#include "LightSong.hxx"
+#include "time/ISO8601.hxx"
+#include "util/StringBuffer.hxx"
+
+std::string
+AddedSinceSongFilter::ToExpression() const noexcept
+{
+	return std::string("(added-since \"") + FormatISO8601(value).c_str() + "\")";
+}
+
+bool
+AddedSinceSongFilter::Match(const LightSong &song) const noexcept
+{
+	return song.added >= value;
+}

src/song/AddedSinceSongFilter.hxx

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// Copyright The Music Player Daemon Project
+
+#ifndef MPD_ADDED_SINCE_SONG_FILTER_HXX
+#define MPD_ADDED_SINCE_SONG_FILTER_HXX
+
+#include "ISongFilter.hxx"
+
+#include <chrono>
+
+class AddedSinceSongFilter final : public ISongFilter {
+	std::chrono::system_clock::time_point value;
+
+public:
+	explicit AddedSinceSongFilter(std::chrono::system_clock::time_point _value) noexcept
+		:value(_value) {}
+
+	ISongFilterPtr Clone() const noexcept override {
+		return std::make_unique<AddedSinceSongFilter>(*this);
+	}
+
+	std::string ToExpression() const noexcept override;
+	bool Match(const LightSong &song) const noexcept override;
+};
+
+#endif

src/song/Filter.cxx

@@ -8,6 +8,7 @@
 #include "BaseSongFilter.hxx"
 #include "TagSongFilter.hxx"
 #include "ModifiedSinceSongFilter.hxx"
+#include "AddedSinceSongFilter.hxx"
 #include "AudioFormatSongFilter.hxx"
 #include "PrioritySongFilter.hxx"
 #include "pcm/AudioParser.hxx"
@@ -40,6 +41,7 @@ enum {
 	LOCATE_TAG_PRIORITY,
 	LOCATE_TAG_FILE_TYPE,
 	LOCATE_TAG_ANY_TYPE,
+	LOCATE_TAG_ADDED_SINCE,
 };
 
 /**
@@ -62,6 +64,9 @@ locate_parse_type(const char *str) noexcept
 	if (strcmp(str, "modified-since") == 0)
 		return LOCATE_TAG_MODIFIED_SINCE;
 
+	if (strcmp(str, "added-since") == 0)
+		return LOCATE_TAG_ADDED_SINCE;
+
 	if (StringEqualsCaseASCII(str, "AudioFormat"))
 		return LOCATE_TAG_AUDIO_FORMAT;
 
@@ -322,6 +327,12 @@ SongFilter::ParseExpression(const char *&s, bool fold_case)
 			throw std::runtime_error("')' expected");
 		s = StripLeft(s + 1);
 		return std::make_unique<ModifiedSinceSongFilter>(ParseTimeStamp(value_s.c_str()));
+	} else if (type == LOCATE_TAG_ADDED_SINCE) {
+		const auto value_s = ExpectQuoted(s);
+		if (*s != ')')
+			throw std::runtime_error("')' expected");
+		s = StripLeft(s + 1);
+		return std::make_unique<AddedSinceSongFilter>(ParseTimeStamp(value_s.c_str()));
 	} else if (type == LOCATE_TAG_BASE_TYPE) {
 		auto value = ExpectQuoted(s);
 		if (*s != ')')
@@ -406,6 +417,10 @@ SongFilter::Parse(const char *tag_string, const char *value, bool fold_case)
 	case LOCATE_TAG_MODIFIED_SINCE:
 		and_filter.AddItem(std::make_unique<ModifiedSinceSongFilter>(ParseTimeStamp(value)));
 		break;
+	
+	case LOCATE_TAG_ADDED_SINCE:
+		and_filter.AddItem(std::make_unique<AddedSinceSongFilter>(ParseTimeStamp(value)));
+		break;
 
 	case LOCATE_TAG_FILE_TYPE:
 		/* for compatibility with MPD 0.20 and older,

src/song/meson.build

@@ -7,6 +7,7 @@ song = static_library(
   'BaseSongFilter.cxx',
   'TagSongFilter.cxx',
   'ModifiedSinceSongFilter.cxx',
+  'AddedSinceSongFilter.cxx',
   'PrioritySongFilter.cxx',
   'AudioFormatSongFilter.cxx',
   'AndSongFilter.cxx',