python_packaging/src/external/pybind/tools/FindCatch.cmake

   1 # - Find the Catch test framework or download it (single header)
   2 #
   3 # This is a quick module for internal use. It assumes that Catch is
   4 # REQUIRED and that a minimum version is provided (not EXACT). If
   5 # a suitable version isn't found locally, the single header file
   6 # will be downloaded and placed in the build dir: PROJECT_BINARY_DIR.
   7 #
   8 # This code sets the following variables:
   9 #  CATCH_INCLUDE_DIR      - path to catch.hpp
  10 #  CATCH_VERSION          - version number
  11
  12 if(NOT Catch_FIND_VERSION)
  13   message(FATAL_ERROR "A version number must be specified.")
  14 elseif(Catch_FIND_REQUIRED)
  15   message(FATAL_ERROR "This module assumes Catch is not required.")
  16 elseif(Catch_FIND_VERSION_EXACT)
  17   message(FATAL_ERROR "Exact version numbers are not supported, only minimum.")
  18 endif()
  19
  20 # Extract the version number from catch.hpp
  21 function(_get_catch_version)
  22   file(STRINGS "${CATCH_INCLUDE_DIR}/catch.hpp" version_line REGEX "Catch v.*" LIMIT_COUNT 1)
  23   if(version_line MATCHES "Catch v([0-9]+)\\.([0-9]+)\\.([0-9]+)")
  24     set(CATCH_VERSION "${CMAKE_MATCH_1}.${CMAKE_MATCH_2}.${CMAKE_MATCH_3}" PARENT_SCOPE)
  25   endif()
  26 endfunction()
  27
  28 # Download the single-header version of Catch
  29 function(_download_catch version destination_dir)
  30   message(STATUS "Downloading catch v${version}...")
  31   set(url https://github.com/philsquared/Catch/releases/download/v${version}/catch.hpp)
  32   file(DOWNLOAD ${url} "${destination_dir}/catch.hpp" STATUS status)
  33   list(GET status 0 error)
  34   if(error)
  35     message(FATAL_ERROR "Could not download ${url}")
  36   endif()
  37   set(CATCH_INCLUDE_DIR "${destination_dir}" CACHE INTERNAL "")
  38 endfunction()
  39
  40 # Look for catch locally
  41 find_path(CATCH_INCLUDE_DIR NAMES catch.hpp PATH_SUFFIXES catch)
  42 if(CATCH_INCLUDE_DIR)
  43   _get_catch_version()
  44 endif()
  45
  46 # Download the header if it wasn't found or if it's outdated
  47 if(NOT CATCH_VERSION OR CATCH_VERSION VERSION_LESS ${Catch_FIND_VERSION})
  48   if(DOWNLOAD_CATCH)
  49     _download_catch(${Catch_FIND_VERSION} "${PROJECT_BINARY_DIR}/catch/")
  50     _get_catch_version()
  51   else()
  52     set(CATCH_FOUND FALSE)
  53     return()
  54   endif()
  55 endif()
  56
  57 set(CATCH_FOUND TRUE)