msgpack: intro msgpack_to_json tool

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/msgpack/msgpack_to_json.nit b/lib/msgpack/msgpack_to_json.nit
new file mode 100644 (file)
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+++ b/lib/msgpack/msgpack_to_json.nit
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+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Convert MessagePack format to JSON
+module msgpack_to_json
+
+import msgpack::read
+import json
+
+if args.has("-h") then
+       print "Usage: nit msgpack::msgpack_to_json [source_file.msgpack]"
+       print "Convert MessagePack format to JSON. Read from stdin if no source_file is given."
+       exit 0
+end
+
+var reader = if args.length >= 1 then
+               new FileReader.open(args.first)
+       else stdin
+
+while reader.last_error == null and not reader.eof do
+       var deserialized = reader.read_msgpack
+
+       if deserialized != null then
+               print deserialized.serialize_to_json(plain=true, pretty=true)
+       else
+               print "null"
+       end
+end