Feature/installation and dependency management

.cmake/.gitignore

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+*.sw?
+*~
+*.bak

.cmake/Backports/X11.cmake

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+cmake_minimum_required(VERSION 3.12.1)
+include_guard(DIRECTORY)
+
+include("${CMAKE_CURRENT_LIST_DIR}/../config.cmake")
+
+if(shacl.cmake.installation)
+  get_property(
+    shacl.cmake.installed_modules GLOBAL PROPERTY shacl.cmake.installed_modules)
+
+  if(NOT "Backports/X11" IN_LIST shacl.cmake.installed_modules)
+    set_property(GLOBAL APPEND PROPERTY
+      shacl.cmake.installed_modules "Backports/X11")
+
+    install(
+      FILES "${CMAKE_CURRENT_LIST_FILE}"
+      DESTINATION share/cmake/shacl/.cmake/Backports)
+
+    install(
+      DIRECTORY "${CMAKE_CURRENT_LIST_DIR}/X11"
+      DESTINATION share/cmake/shacl/.cmake/Backports)
+  endif()
+
+  unset(shacl.cmake.installed_modules)
+endif()
+
+set_property(GLOBAL PROPERTY FIND_LIBRARY_USE_LIB64_PATHS ON)
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/X11")

.cmake/Backports/X11/CheckFunctionExists.c

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+#ifdef CHECK_FUNCTION_EXISTS
+
+#ifdef __cplusplus
+extern "C"
+#endif
+  char
+  CHECK_FUNCTION_EXISTS(void);
+#ifdef __CLASSIC_C__
+int main()
+{
+  int ac;
+  char* av[];
+#else
+int main(int ac, char* av[])
+{
+#endif
+  CHECK_FUNCTION_EXISTS();
+  if (ac > 1000) {
+    return *av[0];
+  }
+  return 0;
+}
+
+#else /* CHECK_FUNCTION_EXISTS */
+
+#error "CHECK_FUNCTION_EXISTS has to specify the function"
+
+#endif /* CHECK_FUNCTION_EXISTS */

.cmake/Backports/X11/CheckFunctionExists.cmake

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+cmake_minimum_required(VERSION 3.12.1)
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#.rst:
+# CheckFunctionExists
+# -------------------
+#
+# Check if a C function can be linked::
+#
+#   check_function_exists(<function> <variable>)
+#
+# Check that the ``<function>`` is provided by libraries on the system and store
+# the result in a ``<variable>``. ``<variable>`` will be created as an internal
+# cache variable.
+#
+# The following variables may be set before calling this macro to modify the
+# way the check is run:
+#
+# ::
+#
+#   CMAKE_REQUIRED_FLAGS = string of compile command line flags
+#   CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
+#   CMAKE_REQUIRED_INCLUDES = list of include directories
+#   CMAKE_REQUIRED_LIBRARIES = list of libraries to link
+#   CMAKE_REQUIRED_QUIET = execute quietly without messages
+#
+# .. note::
+#
+#   Prefer using :Module:`CheckSymbolExists` instead of this module,
+#   for the following reasons:
+#
+#   * ``check_function_exists()`` can't detect functions that are inlined
+#     in headers or specified as a macro.
+#
+#   * ``check_function_exists()`` can't detect anything in the 32-bit
+#     versions of the Win32 API, because of a mismatch in calling conventions.
+#
+#   * ``check_function_exists()`` only verifies linking, it does not verify
+#     that the function is declared in system headers.
+
+macro(CHECK_FUNCTION_EXISTS FUNCTION VARIABLE)
+  if(NOT DEFINED "${VARIABLE}" OR "x${${VARIABLE}}" STREQUAL "x${VARIABLE}")
+    set(MACRO_CHECK_FUNCTION_DEFINITIONS
+      "-DCHECK_FUNCTION_EXISTS=${FUNCTION} ${CMAKE_REQUIRED_FLAGS}")
+    if(NOT CMAKE_REQUIRED_QUIET)
+      message(STATUS "Looking for ${FUNCTION}")
+    endif()
+    if(CMAKE_REQUIRED_LIBRARIES)
+      set(CHECK_FUNCTION_EXISTS_ADD_LIBRARIES
+        LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
+    else()
+      set(CHECK_FUNCTION_EXISTS_ADD_LIBRARIES)
+    endif()
+    if(CMAKE_REQUIRED_INCLUDES)
+      set(CHECK_FUNCTION_EXISTS_ADD_INCLUDES
+        "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
+    else()
+      set(CHECK_FUNCTION_EXISTS_ADD_INCLUDES)
+    endif()
+
+    if(CMAKE_C_COMPILER_LOADED)
+      set(_cfe_source ${CMAKE_ROOT}/Modules/CheckFunctionExists.c)
+    elseif(CMAKE_CXX_COMPILER_LOADED)
+      set(_cfe_source ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckFunctionExists/CheckFunctionExists.cxx)
+      configure_file(${CMAKE_ROOT}/Modules/CheckFunctionExists.c "${_cfe_source}" COPYONLY)
+    else()
+      message(FATAL_ERROR "CHECK_FUNCTION_EXISTS needs either C or CXX language enabled")
+    endif()
+
+    try_compile(${VARIABLE}
+      ${CMAKE_BINARY_DIR}
+      ${_cfe_source}
+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
+      ${CHECK_FUNCTION_EXISTS_ADD_LIBRARIES}
+      CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
+      "${CHECK_FUNCTION_EXISTS_ADD_INCLUDES}"
+      OUTPUT_VARIABLE OUTPUT)
+    unset(_cfe_source)
+
+    if(${VARIABLE})
+      set(${VARIABLE} 1 CACHE INTERNAL "Have function ${FUNCTION}")
+      if(NOT CMAKE_REQUIRED_QUIET)
+        message(STATUS "Looking for ${FUNCTION} - found")
+      endif()
+      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
+        "Determining if the function ${FUNCTION} exists passed with the following output:\n"
+        "${OUTPUT}\n\n")
+    else()
+      if(NOT CMAKE_REQUIRED_QUIET)
+        message(STATUS "Looking for ${FUNCTION} - not found")
+      endif()
+      set(${VARIABLE} "" CACHE INTERNAL "Have function ${FUNCTION}")
+      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
+        "Determining if the function ${FUNCTION} exists failed with the following output:\n"
+        "${OUTPUT}\n\n")
+    endif()
+  endif()
+endmacro()

.cmake/Backports/X11/CheckLibraryExists.cmake

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+cmake_minimum_required(VERSION 3.12.1)
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#.rst:
+# CheckLibraryExists
+# ------------------
+#
+# Check if the function exists.
+#
+# CHECK_LIBRARY_EXISTS (LIBRARY FUNCTION LOCATION VARIABLE)
+#
+# ::
+#
+#   LIBRARY  - the name of the library you are looking for
+#   FUNCTION - the name of the function
+#   LOCATION - location where the library should be found
+#   VARIABLE - variable to store the result
+#              Will be created as an internal cache variable.
+#
+#
+#
+# The following variables may be set before calling this macro to modify
+# the way the check is run:
+#
+# ::
+#
+#   CMAKE_REQUIRED_FLAGS = string of compile command line flags
+#   CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
+#   CMAKE_REQUIRED_LIBRARIES = list of libraries to link
+#   CMAKE_REQUIRED_QUIET = execute quietly without messages
+
+macro(CHECK_LIBRARY_EXISTS LIBRARY FUNCTION LOCATION VARIABLE)
+  if(NOT DEFINED "${VARIABLE}")
+    set(MACRO_CHECK_LIBRARY_EXISTS_DEFINITION
+      "-DCHECK_FUNCTION_EXISTS=${FUNCTION} ${CMAKE_REQUIRED_FLAGS}")
+    if(NOT CMAKE_REQUIRED_QUIET)
+      message(STATUS "Looking for ${FUNCTION} in ${LIBRARY}")
+    endif()
+    set(CHECK_LIBRARY_EXISTS_LIBRARIES ${LIBRARY})
+    if(CMAKE_REQUIRED_LIBRARIES)
+      set(CHECK_LIBRARY_EXISTS_LIBRARIES
+        ${CHECK_LIBRARY_EXISTS_LIBRARIES} ${CMAKE_REQUIRED_LIBRARIES})
+    endif()
+
+    if(CMAKE_C_COMPILER_LOADED)
+      set(_cle_source ${CMAKE_ROOT}/Modules/CheckFunctionExists.c)
+    elseif(CMAKE_CXX_COMPILER_LOADED)
+      set(_cle_source ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckLibraryExists/CheckFunctionExists.cxx)
+      configure_file(${CMAKE_ROOT}/Modules/CheckFunctionExists.c "${_cle_source}" COPYONLY)
+    else()
+      message(FATAL_ERROR "CHECK_FUNCTION_EXISTS needs either C or CXX language enabled")
+    endif()
+
+    try_compile(${VARIABLE}
+      ${CMAKE_BINARY_DIR}
+      ${_cle_source}
+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
+      LINK_LIBRARIES ${CHECK_LIBRARY_EXISTS_LIBRARIES}
+      CMAKE_FLAGS
+      -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_LIBRARY_EXISTS_DEFINITION}
+      -DLINK_DIRECTORIES:STRING=${LOCATION}
+      OUTPUT_VARIABLE OUTPUT)
+    unset(_cle_source)
+
+    if(${VARIABLE})
+      if(NOT CMAKE_REQUIRED_QUIET)
+        message(STATUS "Looking for ${FUNCTION} in ${LIBRARY} - found")
+      endif()
+      set(${VARIABLE} 1 CACHE INTERNAL "Have library ${LIBRARY}")
+      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
+        "Determining if the function ${FUNCTION} exists in the ${LIBRARY} "
+        "passed with the following output:\n"
+        "${OUTPUT}\n\n")
+    else()
+      if(NOT CMAKE_REQUIRED_QUIET)
+        message(STATUS "Looking for ${FUNCTION} in ${LIBRARY} - not found")
+      endif()
+      set(${VARIABLE} "" CACHE INTERNAL "Have library ${LIBRARY}")
+      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
+        "Determining if the function ${FUNCTION} exists in the ${LIBRARY} "
+        "failed with the following output:\n"
+        "${OUTPUT}\n\n")
+    endif()
+  endif()
+endmacro()

.cmake/Backports/X11/FindPackageMessage.cmake

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+cmake_minimum_required(VERSION 3.12.1)
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#.rst:
+# FindPackageMessage
+# ------------------
+#
+#
+#
+# FIND_PACKAGE_MESSAGE(<name> "message for user" "find result details")
+#
+# This macro is intended to be used in FindXXX.cmake modules files.  It
+# will print a message once for each unique find result.  This is useful
+# for telling the user where a package was found.  The first argument
+# specifies the name (XXX) of the package.  The second argument
+# specifies the message to display.  The third argument lists details
+# about the find result so that if they change the message will be
+# displayed again.  The macro also obeys the QUIET argument to the
+# find_package command.
+#
+# Example:
+#
+# ::
+#
+#   if(X11_FOUND)
+#     FIND_PACKAGE_MESSAGE(X11 "Found X11: ${X11_X11_LIB}"
+#       "[${X11_X11_LIB}][${X11_INCLUDE_DIR}]")
+#   else()
+#    ...
+#   endif()
+
+function(FIND_PACKAGE_MESSAGE pkg msg details)
+  # Avoid printing a message repeatedly for the same find result.
+  if(NOT ${pkg}_FIND_QUIETLY)
+    string(REPLACE "\n" "" details "${details}")
+    set(DETAILS_VAR FIND_PACKAGE_MESSAGE_DETAILS_${pkg})
+    if(NOT "${details}" STREQUAL "${${DETAILS_VAR}}")
+      # The message has not yet been printed.
+      message(STATUS "${msg}")
+
+      # Save the find details in the cache to avoid printing the same
+      # message again.
+      set("${DETAILS_VAR}" "${details}"
+        CACHE INTERNAL "Details about finding ${pkg}")
+    endif()
+  endif()
+endfunction()