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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
12if(NOT Catch_FIND_VERSION)
13  message(FATAL_ERROR "A version number must be specified.")
14elseif(Catch_FIND_REQUIRED)
15  message(FATAL_ERROR "This module assumes Catch is not required.")
16elseif(Catch_FIND_VERSION_EXACT)
17  message(FATAL_ERROR "Exact version numbers are not supported, only minimum.")
18endif()
19
20# Extract the version number from catch.hpp
21function(_get_catch_version)
22  file(
23    STRINGS "${CATCH_INCLUDE_DIR}/catch.hpp" version_line
24    REGEX "Catch v.*"
25    LIMIT_COUNT 1)
26  if(version_line MATCHES "Catch v([0-9]+)\\.([0-9]+)\\.([0-9]+)")
27    set(CATCH_VERSION
28        "${CMAKE_MATCH_1}.${CMAKE_MATCH_2}.${CMAKE_MATCH_3}"
29        PARENT_SCOPE)
30  endif()
31endfunction()
32
33# Download the single-header version of Catch
34function(_download_catch version destination_dir)
35  message(STATUS "Downloading catch v${version}...")
36  set(url https://github.com/philsquared/Catch/releases/download/v${version}/catch.hpp)
37  file(DOWNLOAD ${url} "${destination_dir}/catch.hpp" STATUS status)
38  list(GET status 0 error)
39  if(error)
40    message(FATAL_ERROR "Could not download ${url}")
41  endif()
42  set(CATCH_INCLUDE_DIR
43      "${destination_dir}"
44      CACHE INTERNAL "")
45endfunction()
46
47# Look for catch locally
48find_path(
49  CATCH_INCLUDE_DIR
50  NAMES catch.hpp
51  PATH_SUFFIXES catch2)
52if(CATCH_INCLUDE_DIR)
53  _get_catch_version()
54endif()
55
56# Download the header if it wasn't found or if it's outdated
57if(NOT CATCH_VERSION OR CATCH_VERSION VERSION_LESS ${Catch_FIND_VERSION})
58  if(DOWNLOAD_CATCH)
59    _download_catch(${Catch_FIND_VERSION} "${PROJECT_BINARY_DIR}/catch/")
60    _get_catch_version()
61  else()
62    set(CATCH_FOUND FALSE)
63    return()
64  endif()
65endif()
66
67add_library(Catch2::Catch2 IMPORTED INTERFACE)
68set_property(TARGET Catch2::Catch2 PROPERTY INTERFACE_INCLUDE_DIRECTORIES "${CATCH_INCLUDE_DIR}")
69
70set(CATCH_FOUND TRUE)
71