Added cmake and ported to current mapnik master version

.gitignore

@@ -0,0 +1,2 @@
+build
+.vscode

CMakeLists.txt

@@ -0,0 +1,26 @@
+cmake_minimum_required(VERSION 3.15)
+project(hello-world-input-plugin)
+
+option(BUILD_TEST "builds the tests" ON)
+
+find_package(mapnik CONFIG REQUIRED)
+
+add_library(hello-world-input-plugin SHARED 
+    hello_datasource.cpp
+    hello_featureset.cpp
+)
+
+target_link_libraries(hello-world-input-plugin PRIVATE mapnik::mapnik)
+
+set_target_properties(hello-world-input-plugin PROPERTIES 
+    PREFIX ""
+    OUTPUT_NAME "hello"
+    SUFFIX ".input"
+)
+
+if(BUILD_TEST)
+    enable_testing()
+    add_subdirectory(test)
+endif()
+
+install(TARGETS hello-world-input-plugin RUNTIME DESTINATION bin/plugins)

hello_datasource.hpp

@@ -6,7 +6,7 @@
 #include <mapnik/params.hpp>
 #include <mapnik/query.hpp>
 #include <mapnik/feature.hpp>
-#include <mapnik/box2d.hpp>
+#include <mapnik/geometry/box2d.hpp>
 #include <mapnik/coord.hpp>
 #include <mapnik/feature_layer_desc.hpp>
 

hello_featureset.cpp

@@ -1,6 +1,6 @@
 // mapnik
 #include <mapnik/feature_factory.hpp>
-#include <mapnik/value_types.hpp>
+#include <mapnik/value/types.hpp>
 
 // boost
 
@@ -56,10 +56,10 @@ mapnik::feature_ptr hello_featureset::next()
         // to dynamically generate a fake line
         mapnik::geometry::line_string<double> line;
         line.reserve(4);
-        line.add_coord(box_.minx(),box_.maxy());
-        line.add_coord(box_.maxx(),box_.maxy());
-        line.add_coord(box_.maxx(),box_.miny());
-        line.add_coord(box_.minx(),box_.miny());
+        line.push_back({box_.minx(),box_.maxy()});
+        line.push_back({box_.maxx(),box_.maxy()});
+        line.push_back({box_.maxx(),box_.miny()});
+        line.push_back({box_.minx(),box_.miny()});
         feature->set_geometry(std::move(line));
         return feature;
     }

test/CMakeLists.txt

@@ -0,0 +1,28 @@
+Include(FetchContent)
+
+if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.19.0") 
+    # for cmake 3.19+ https://cmake.org/cmake/help/git-stage/policy/CMP0110.html
+    # might not be needed if catch updates its cmakes
+    cmake_policy(SET CMP0110 OLD)
+endif()
+
+
+FetchContent_Declare(
+  Catch2
+  GIT_REPOSITORY https://github.com/catchorg/Catch2.git
+  GIT_TAG        v2.13.7
+)
+FetchContent_MakeAvailable(Catch2)
+
+add_executable(input-test unit.cpp)
+target_link_libraries(input-test PRIVATE 
+  Catch2::Catch2
+  mapnik::mapnik
+)
+set_target_properties(input-test PROPERTIES
+  RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}
+)
+
+include(CTest)
+include("${catch2_SOURCE_DIR}/contrib/Catch.cmake")
+catch_discover_tests(input-test)