--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/PlainFilesystemCommand.h	Mon Jan 20 13:11:50 2020 +0100
@@ -0,0 +1,73 @@
+/**
+ * Relational pipes
+ * Copyright © 2019 František Kučera (Frantovo.cz, GlobalCode.info)
+ *
+ * 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, version 3 of the License.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#include "FilesystemCommandBase.h"
+
+namespace relpipe {
+namespace in {
+namespace filesystem {
+
+namespace fs = std::filesystem;
+using namespace relpipe::writer;
+
+class PlainFilesystemCommand : public FilesystemCommandBase {
+private:
+	std::map<string_t, std::shared_ptr<AttributeFinder>> attributeFinders = createAttributeFinders();
+
+public:
+
+	void process(std::istream& input, std::ostream& output, Configuration& configuration) {
+		std::shared_ptr<RelationalWriter> writer(Factory::create(output));
+
+		string_t relationName = configuration.relation.empty() ? L"filesystem" : configuration.relation;
+
+		std::vector<AttributeMetadata> attributesMetadata;
+		for (RequestedField field : configuration.fields) {
+			std::shared_ptr<AttributeFinder> finder = attributeFinders[field.group];
+			if (finder) for (AttributeMetadata m : finder->toMetadata(writer.get(), relationName, field)) attributesMetadata.push_back(m);
+			else throw RelpipeWriterException(L"Unsupported field group: " + field.group);
+		}
+
+		writer->startRelation(relationName, attributesMetadata, true);
+
+
+		for (std::stringstream originalName; readNext(input, originalName); reset(originalName)) {
+			fs::path file(originalName.str().empty() ? "." : originalName.str()); // interpret empty string as current directory (e.g. result of: find -printf '%P\0')
+			bool exists = false;
+
+			try {
+				exists = fs::exists(file);
+			} catch (const fs::filesystem_error& e) {
+				// we probably do not have permissions to given directory → pretend that the file does not exist
+			}
+
+			for (auto& finder : attributeFinders) finder.second->startFile(file, originalName.str(), exists);
+
+			for (RequestedField field : configuration.fields) {
+				std::shared_ptr<AttributeFinder> finder = attributeFinders[field.group]; // should not be nullptr, because already checked while writing the relation metadata
+				finder->writeField(writer.get(), relationName, field);
+			}
+
+			for (auto& finder : attributeFinders) finder.second->endFile();
+		}
+	}
+};
+
+}
+}
+}