Added a scan report button (Fixes #4), also fixed the regression about files being always rescanned even if no change has been made

src/scanner/MediaScannerStats.hpp

@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2019 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS 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 LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <Wt/WDateTime.h>
+
+#include <filesystem>
+#include <vector>
+
+namespace Scanner {
+
+	enum class ScanErrorType
+	{
+		CannotReadFile,		// cannot read file
+		CannotParseFile,	// cannot parse file
+		NoAudioTrack,		// no audio track found
+		BadDuration,		// bad duration
+	};
+
+	enum class DuplicateReason
+	{
+		SameHash,
+		SameMBID,
+	};
+
+	struct ScanError
+	{
+		std::filesystem::path	file;
+		ScanErrorType		error;
+		std::string		systemError;
+
+		ScanError(const std::filesystem::path& file, ScanErrorType error, const std::string& systemError = "");
+	};
+
+	struct ScanDuplicate
+	{
+		std::filesystem::path   file;
+		DuplicateReason		reason;
+
+	};
+
+	// reduced scan stats
+	struct ScanProgressStats
+	{
+		Wt::WDateTime   startTime;
+
+		std::size_t     filesToScan {};
+		std::size_t	processedFiles {};
+
+		unsigned	progress() const;
+	};
+
+	struct ScanStats
+	{
+		Wt::WDateTime	startTime;
+		Wt::WDateTime	stopTime;
+
+		std::size_t	filesToScan {};		// Total number of files to be scanned (estimated)
+
+		std::size_t	skips {};		// no change since last scan
+		std::size_t	scans {};		// actually scanned filed
+
+		std::size_t	additions {};		// Added in DB
+		std::size_t	deletions {};		// removed from DB
+		std::size_t	updates {};		// updated file in DB
+
+		std::vector<ScanError>		errors;
+		std::vector<ScanDuplicate>	duplicates;
+
+		std::size_t	nbFiles() const;
+		std::size_t	nbChanges() const;
+
+		ScanProgressStats toProgressStats() const;
+	};
+
+}
+