Remove obsoleted build systems

After the switch to cmake, we don't need the hand-written Makefile
nor the contrib/ version of the cmake file.

Makefile

@@ -1,41 +0,0 @@
-# Use C++11, dont warn on long-to-float conversion
-CXXFLAGS += -std=c++11 -Wno-conversion
-
-# Default to using system's default version of python
-PYTHON_BIN     ?= python3
-PYTHON_CONFIG  := $(PYTHON_BIN)-config
-PYTHON_INCLUDE ?= $(shell $(PYTHON_CONFIG) --includes)
-EXTRA_FLAGS    := $(PYTHON_INCLUDE)
-# NOTE: Since python3.8, the correct invocation is `python3-config --libs --embed`.
-# So of course the proper way to get python libs for embedding now is to
-# invoke that, check if it crashes, and fall back to just `--libs` if it does.
-LDFLAGS        += $(shell if $(PYTHON_CONFIG) --ldflags --embed >/dev/null; then $(PYTHON_CONFIG) --ldflags --embed; else $(PYTHON_CONFIG) --ldflags; fi)
-
-# Either finds numpy or set -DWITHOUT_NUMPY
-EXTRA_FLAGS     += $(shell $(PYTHON_BIN) $(CURDIR)/numpy_flags.py)
-WITHOUT_NUMPY   := $(findstring $(EXTRA_FLAGS), WITHOUT_NUMPY)
-
-# Examples requiring numpy support to compile
-EXAMPLES_NUMPY  := surface colorbar
-EXAMPLES        := minimal basic modern animation nonblock xkcd quiver bar \
-	           fill_inbetween fill update subplot2grid lines3d \
-                   $(if $(WITHOUT_NUMPY),,$(EXAMPLES_NUMPY))
-
-# Prefix every example with 'examples/build/'
-EXAMPLE_TARGETS := $(patsubst %,examples/build/%,$(EXAMPLES))
-
-.PHONY: examples
-
-examples: $(EXAMPLE_TARGETS)
-
-docs:
-	doxygen
-	moxygen doc/xml --noindex -o doc/api.md
-
-# Assume every *.cpp file is a separate example
-$(EXAMPLE_TARGETS): examples/build/%: examples/%.cpp matplotlibcpp.h
-	mkdir -p examples/build
-	$(CXX) -o $@ $< $(EXTRA_FLAGS) $(CXXFLAGS) $(LDFLAGS)
-
-clean:
-	rm -f ${EXAMPLE_TARGETS}

README.md

@@ -202,39 +202,34 @@ If, for some reason, you're unable to get a working installation of numpy on you
 you can define the macro `WITHOUT_NUMPY` before including the header file to erase this
 dependency.
 
-The C++-part of the library consists of the single header file `matplotlibcpp.h` which can be placed
-anywhere.
+The C++-part of the library consists of the single header file `matplotlibcpp.h` which
+can be placed anywhere.
 
-Since a python interpreter is opened internally, it is necessary to link against `libpython` in order
-to user matplotlib-cpp. Most versions should work, although `libpython2.7` and `libpython3.6` are
-probably the most regularly testedr.
+Since a python interpreter is opened internally, it is necessary to link
+against `libpython` in order to user matplotlib-cpp. Most versions should
+work, although python likes to randomly break compatibility from time to time
+so some caution is advised when using the bleeding edge.
 
 
 # CMake
 
-If you prefer to use CMake as build system, you will want to add something like this to your
-CMakeLists.txt:
+The C++ code is compatible to both python2 and python3. However, the `CMakeLists.txt`
+file is currently set up to use python3 by default, so if python2 is required this
+has to be changed manually. (a PR that adds a cmake option for this would be highly
+welcomed)
 
-**Recommended way (since CMake 3.12):**
+**NOTE**: By design (of python), only a single python interpreter can be created per
+process. When using this library, *no other* library that is spawning a python
+interpreter internally can be used.
 
-It's easy to use cmake official [docs](https://cmake.org/cmake/help/git-stage/module/FindPython2.html#module:FindPython2) to find Python 2(or 3) interpreter, compiler and development environment (include directories and libraries).
+To compile the code without using cmake, the compiler invocation should look like
+this:
 
-NumPy is optional here, delete it from cmake script, if you don't need it.
+    g++ example.cpp -I/usr/include/python2.7 -lpython2.7
 
-```cmake
-find_package(Python2 COMPONENTS Development NumPy)
-target_include_directories(myproject PRIVATE ${Python2_INCLUDE_DIRS} ${Python2_NumPy_INCLUDE_DIRS})
-target_link_libraries(myproject Python2::Python Python2::NumPy)
-```
-
-**Alternative way (for CMake <= 3.11):**
-
-```cmake
-find_package(PythonLibs 2.7)
-target_include_directories(myproject PRIVATE ${PYTHON_INCLUDE_DIRS})
-target_link_libraries(myproject ${PYTHON_LIBRARIES})
-```
+This can also be used for linking against a custom build of python
 
+    g++ example.cpp -I/usr/local/include/fancy-python4 -L/usr/local/lib -lfancy-python4
 
 # Vcpkg
 
@@ -258,17 +253,6 @@ Note that support for c++98 was dropped more or less accidentally, so if you hav
 with an ancient compiler and still want to enjoy the latest additional features, I'd
 probably merge a PR that restores support.
 
-# Python 3
-
-This library supports both python2 and python3 (although the python3 support is probably far less tested,
-so it is recommended to prefer python2.7). To switch the used python version, simply change
-the compiler flags accordingly.
-
-    g++ example.cpp -I/usr/include/python3.6 -lpython3.6
-
-The same technique can be used for linking against a custom build of python
-
-    g++ example.cpp -I/usr/local/include/fancy-python4 -L/usr/local/lib -lfancy-python4
 
 
 Why?

contrib/CMakeLists.txt

@@ -1,26 +0,0 @@
-cmake_minimum_required(VERSION 3.7)
-project (MatplotlibCPP_Test)
-
-set(CMAKE_CXX_STANDARD 11)
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
-
-include_directories(${PYTHONHOME}/include)
-include_directories(${PYTHONHOME}/Lib/site-packages/numpy/core/include)
-link_directories(${PYTHONHOME}/libs)
-
-add_definitions(-DMATPLOTLIBCPP_PYTHON_HEADER=Python.h)
-
-# message(STATUS "*** dump start cmake variables ***")
-# get_cmake_property(_variableNames VARIABLES)
-# foreach(_variableName ${_variableNames})
-#         message(STATUS "${_variableName}=${${_variableName}}")
-# endforeach()
-# message(STATUS "*** dump end ***")
-
-add_executable(minimal ${CMAKE_CURRENT_SOURCE_DIR}/../examples/minimal.cpp)
-add_executable(basic ${CMAKE_CURRENT_SOURCE_DIR}/../examples/basic.cpp)
-add_executable(modern ${CMAKE_CURRENT_SOURCE_DIR}/../examples/modern.cpp)
-add_executable(animation ${CMAKE_CURRENT_SOURCE_DIR}/../examples/animation.cpp)
-add_executable(nonblock ${CMAKE_CURRENT_SOURCE_DIR}/../examples/nonblock.cpp)
-add_executable(xkcd ${CMAKE_CURRENT_SOURCE_DIR}/../examples/xkcd.cpp)
-add_executable(bar ${CMAKE_CURRENT_SOURCE_DIR}/../examples/bar.cpp)

numpy_flags.py

@@ -1,12 +0,0 @@
-from os import path
-
-try:
-    from numpy import __file__ as numpyloc
-
-    # Get numpy directory
-    numpy_dir = path.dirname(numpyloc)
-
-    # Print the result of joining this to core and include
-    print("-I" + path.join(numpy_dir, "core", "include"))
-except:
-    print("-DWITHOUT_NUMPY")