Configure building of prism api as separate library

Author: Tobias Hafner

meson.build

@@ -0,0 +1,63 @@
+project('polypheny_prism_api', 'cpp', default_options : ['cpp_std=c++17'])
+
+# ========================
+# Dependencies
+# ========================
+
+protobuf_subproject = subproject('protobuf')
+protobuf_dep = protobuf_subproject.get_variable('protobuf_dep')
+protoc = protobuf_subproject.get_variable('protoc')
+
+# ========================
+# Protobuf Code Generation
+# ========================
+
+prism_gen = generator(protoc,
+                      output : ['@[email protected]', '@[email protected]'],
+                      arguments : [
+                          '--proto_path=@CURRENT_SOURCE_DIR@/prism',
+                          '--cpp_out=@BUILD_DIR@',
+                          '--experimental_allow_proto3_optional',
+                          '@INPUT@'
+                      ]
+)
+
+prism_files = files(
+    'prism/connection_requests.proto',
+    'prism/connection_responses.proto',
+    'prism/document_frame.proto',
+    'prism/error.proto',
+    'prism/graph_frame.proto',
+    'prism/meta_requests.proto',
+    'prism/meta_responses.proto',
+    'prism/namespace_meta_requests.proto',
+    'prism/namespace_meta_responses.proto',
+    'prism/protointerface.proto',
+    'prism/relational_frame.proto',
+    'prism/statement_requests.proto',
+    'prism/statement_responses.proto',
+    'prism/transaction_requests.proto',
+    'prism/transaction_responses.proto',
+    'prism/value.proto'
+)
+
+# ========================
+# Library and Dependencies
+# ========================
+
+prism_src = prism_gen.process(prism_files)
+
+# TODO: find a clean way to specify the include dir for the generated protobuf code
+include_dirs = include_directories('../../buildDir/subprojects/polypheny_prism_api/libpolypheny_prism_api.a.p')
+
+polypheny_prism_api_lib = static_library('polypheny_prism_api',
+                                         prism_src,
+                                         dependencies : [protobuf_dep],
+                                         include_directories : include_dirs
+)
+
+polypheny_prism_api_dep = declare_dependency(
+    link_with: polypheny_prism_api_lib,
+    include_directories: include_dirs,
+    dependencies: [protobuf_dep],
+)