CMakeLists.txt

cmake_minimum_required(VERSION 3.10 FATAL_ERROR)
project(lmplugin VERSION 1.0.0 LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(HDF5 REQUIRED COMPONENTS CXX HL)

find_program(VMD_EXECUTABLE NAMES vmd PATH_SUFFIXES bin DOC "Path to VMD start script")
if(VMD_EXECUTABLE)
    file(STRINGS "${VMD_EXECUTABLE}" _VMD_ROOT_DIR REGEX "^[^#]*defaultvmddir[ \t]*=")
    string(REGEX REPLACE "(^.*=[^\"]*\"?|\"$)" "" _VMD_ROOT_DIR "${_VMD_ROOT_DIR}")
else()
    set(_VMD_ROOT_DIR "/usr/local/lib/vmd")
endif()

set(VMD_ROOT_DIR "${_VMD_ROOT_DIR}" CACHE PATH "Path to VMD runtime directory") 

find_path(VMD_PLUGIN_DIR "pdbplugin.so"
            PATHS 
                "${VMD_ROOT_DIR}/plugins/LINUXAMD64/molfile" 
                "${VMD_ROOT_DIR}/plugins/LINUX/molfile" 
                "${VMD_ROOT_DIR}/plugins/MACOSX86/molfile" 
                "${VMD_ROOT_DIR}/plugins/MACOSX86_64/molfile" 
                "${VMD_ROOT_DIR}/plugins/WIN32/molfile"
                "${VMD_ROOT_DIR}/plugins/WIN64/molfile"
            DOC
                "Path to VMD molfile plugin directory"
            NO_DEFAULT_PATH)

find_path(VMD_PLUGIN_INCLUDE_DIR "vmdplugin.h"
            PATHS 
                "${VMD_ROOT_DIR}/plugins/include"
            DOC
                "Path to VMD plugin header directory"
            NO_DEFAULT_PATH)

mark_as_advanced(VMD_ROOT_DIR VMD_EXECUTABLE)

if(VMD_PLUGIN_INCLUDE_DIR)
    message(STATUS "Found VMD molfile directory: `${VMD_PLUGIN_DIR}'")
    add_library(lmplugin SHARED "${CMAKE_CURRENT_SOURCE_DIR}/lmplugin.cpp")
    target_include_directories(lmplugin PUBLIC "${HDF5_INCLUDE_DIRS}" "${VMD_PLUGIN_INCLUDE_DIR}")
    target_link_libraries(lmplugin PUBLIC "${HDF5_HL_LIBRARIES}" "${HDF5_LIBRARIES}")
    target_compile_features(lmplugin PRIVATE cxx_std_17)
    set_target_properties(lmplugin
        PROPERTIES 
            PREFIX ""
            SUFFIX ${CMAKE_SHARED_LIBRARY_SUFFIX}
            INSTALL_RPATH "${CMAKE_PREFIX_PATH}/lib")
    
    if(WIN32)
        set_target_properties(lmplugin PROPERTIES WINDOWS_EXPORT_ALL_SYMBOLS TRUE)
    endif()

    install(TARGETS lmplugin DESTINATION "${VMD_PLUGIN_DIR}")
else()
    message(WARNING "VMD not found. Please set \"VMD_PLUGIN_INCLUDE_DIR\" and \"VMD_PLUGIN_DIR\".")
endif()