Add ListingTagsHandler

src/tags_handlers/listing_tags_handler.cc

@@ -0,0 +1,16 @@
+#include "tags_handlers/listing_tags_handler.h"
+
+using namespace opustags;
+
+ListingTagsHandler::ListingTagsHandler(
+    const int streamno,
+    std::ostream &output_stream)
+    : StreamTagsHandler(streamno), output_stream(output_stream)
+{
+}
+
+void ListingTagsHandler::list_impl(const Tags &tags)
+{
+    for (const auto &kv : tags.get_all())
+        output_stream << std::get<0>(kv) << "=" << std::get<1>(kv) << "\n";
+}

src/tags_handlers/listing_tags_handler.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <iostream>
+#include "tags_handlers/stream_tags_handler.h"
+
+namespace opustags {
+
+    class ListingTagsHandler : public StreamTagsHandler
+    {
+    public:
+        ListingTagsHandler(const int streamno, std::ostream &output_stream);
+
+    protected:
+        void list_impl(const Tags &) override;
+
+    private:
+        std::ostream &output_stream;
+    };
+
+}

tests/tags_handlers/listing_tags_handler_test.cc

@@ -0,0 +1,22 @@
+#include "tags_handlers/listing_tags_handler.h"
+#include "catch.h"
+#include <sstream>
+
+using namespace opustags;
+
+TEST_CASE("Listing tags handler test")
+{
+    const auto streamno = 1;
+
+    Tags tags;
+    tags.set("z", "value1");
+    tags.set("a", "value2");
+    tags.set("y", "value3");
+    tags.set("c", "value4");
+
+    std::stringstream ss;
+    ListingTagsHandler handler(streamno, ss);
+    handler.list(streamno, tags);
+
+    REQUIRE(ss.str() == "z=value1\na=value2\ny=value3\nc=value4\n");
+}