add API to merger for setting a manifest

keyvi/src/cpp/dictionary/dictionary_merger.h

@@ -109,6 +109,15 @@ final {
     dicts_to_merge_.push_back(fsa);
   }
 
+  /**
+   * Set a custom manifest to be embedded into the index file.
+   *
+   * @param manifest as JSON string
+   */
+  void SetManifestFromString(const std::string& manifest){
+    manifest_ = manifest;
+  }
+
   void Merge(const std::string& filename){
     std::priority_queue<SegmentIterator> pqueue;
 
@@ -165,13 +174,15 @@ final {
 
     generator.CloseFeeding();
 
+    generator.SetManifestFromString(manifest_);
     generator.WriteToFile(filename);
   }
 
  private:
   std::vector<fsa::automata_t> dicts_to_merge_;
   size_t memory_limit_;
   fsa::internal::IValueStoreWriter::vs_param_t params_;
+  std::string manifest_ = std::string();
 };
 
 } /* namespace dictionary */

pykeyvi/src/addons/JsonDictionaryMerger.pyx

@@ -0,0 +1,5 @@
+
+
+    def SetManifest(self, manifest):
+        m = json.dumps(manifest)
+        self.inst.get().SetManifestFromString(m)

pykeyvi/src/pxds/dictionary_merger.pxd

@@ -10,4 +10,5 @@ cdef extern from "dictionary/dictionary_types.h" namespace "keyvi::dictionary":
         JsonDictionaryMerger(size_t memory_limit) except +
         JsonDictionaryMerger(size_t memory_limit, libcpp_map[libcpp_string, libcpp_string] value_store_params) except +
         void Add(libcpp_string) except +
+        void SetManifestFromString(libcpp_string) # wrap-ignore
         void Merge(libcpp_string) nogil