FindPatch: Add module to find 'patch' command-line tool

3 files changed, 89 insertions, 0 deletions

diff --git a/Tests/CMakeLists.txt b/Tests/CMakeLists.txt
index 516bc89..3dfc8eb 100644
--- a/Tests/CMakeLists.txt
+++ b/Tests/CMakeLists.txt
@@ -1484,6 +1484,10 @@ ${CMake_BINARY_DIR}/bin/cmake -DDIR=dev -P ${CMake_SOURCE_DIR}/Utilities/Release
     add_subdirectory(FindPNG)
   endif()
 
+  if(CMake_TEST_FindPatch)
+    add_subdirectory(FindPatch)
+  endif()
+
   if(CMake_TEST_FindProtobuf)
     add_subdirectory(FindProtobuf)
   endif()
diff --git a/Tests/FindPatch/CMakeLists.txt b/Tests/FindPatch/CMakeLists.txt
new file mode 100644
index 0000000..541f5bd
--- /dev/null
+++ b/Tests/FindPatch/CMakeLists.txt
@@ -0,0 +1,8 @@
+add_test(NAME FindPatch.Test COMMAND
+  ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+  --build-and-test
+  "${CMake_SOURCE_DIR}/Tests/FindPatch/Test"
+  "${CMake_BINARY_DIR}/Tests/FindPatch/Test"
+  ${build_generator_args}
+  --build-options ${build_options}
+)
diff --git a/Tests/FindPatch/Test/CMakeLists.txt b/Tests/FindPatch/Test/CMakeLists.txt
new file mode 100644
index 0000000..f4cd621
--- /dev/null
+++ b/Tests/FindPatch/Test/CMakeLists.txt
@@ -0,0 +1,77 @@
+cmake_minimum_required(VERSION 3.8)
+project(TestFindPatch VERSION 1.0 LANGUAGES NONE)
+
+macro(_check)
+  if(NOT EXISTS "${Patch_EXECUTABLE}")
+    message(FATAL_ERROR "Failed to lookup Patch_EXECUTABLE [${Patch_EXECUTABLE}]")
+  endif()
+
+  if(NOT DEFINED PATCH_FOUND)
+    message(FATAL_ERROR "Variable PATCH_FOUND is not defined")
+  endif()
+
+  # Is import target available ?
+  if(NOT TARGET Patch::patch)
+    message(FATAL_ERROR "Target Patch::patch is not defined")
+  endif()
+
+  # Check Patch::patch imported location
+  get_property(_imported_location TARGET Patch::patch PROPERTY IMPORTED_LOCATION)
+  if(NOT "${Patch_EXECUTABLE}" STREQUAL "${_imported_location}")
+    message(FATAL_ERROR "\
+Patch_EXECUTABLE is expected to be equal to Patch::patch IMPORTED_LOCATION
+  Patch_EXECUTABLE [${Patch_EXECUTABLE}]
+  Patch::patch IMPORTED_LOCATION [${_imported_location}]
+")
+  endif()
+
+endmacro()
+
+find_package(Patch REQUIRED)
+_check()
+
+# Calling twice should not fail
+find_package(Patch REQUIRED)
+_check()
+
+add_custom_target(TestPatchVersion ALL
+  COMMAND ${Patch_EXECUTABLE} -v
+  )
+
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/QUOTE.txt.baseline"
+[=[Because it's there.
+- George Mallory, 1923
+]=]
+)
+
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/QUOTE.txt" "Because it's there.\n")
+
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/quote-add-author.patch"
+[=[diff --git a/QUOTE.txt b/QUOTE.txt
+index b36681d..68059b3 100644
+--- a/QUOTE.txt
++++ b/QUOTE.txt
+@@ -1 +1,2 @@
+ Because it's there.
++- George Mallory
+]=]
+)
+
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/quote-add-date.patch"
+[=[diff --git a/QUOTE.txt b/QUOTE.txt
+index 68059b3..c6f30c2 100644
+--- a/QUOTE.txt
++++ b/QUOTE.txt
+@@ -1,2 +1,2 @@
+ Because it's there.
+-- George Mallory
++- George Mallory, 1923
+]=]
+)
+
+add_custom_target(TestPatch ALL
+  COMMAND ${Patch_EXECUTABLE} -p1 -i quote-add-author.patch
+  COMMAND Patch::patch -p1 -i quote-add-date.patch
+  COMMAND ${CMAKE_COMMAND} -E compare_files QUOTE.txt QUOTE.txt.baseline
+  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+  )