1 files changed, 63 insertions, 0 deletions
diff --git a/Modules/ExternalProject/extractfile.cmake.in b/Modules/ExternalProject/extractfile.cmake.in
new file mode 100644
index 0000000..d9e07f1
--- /dev/null
+++ b/Modules/ExternalProject/extractfile.cmake.in
@@ -0,0 +1,63 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+cmake_minimum_required(VERSION 3.5)
+
+# Make file names absolute:
+#
+get_filename_component(filename "@filename@" ABSOLUTE)
+get_filename_component(directory "@directory@" ABSOLUTE)
+
+message(STATUS "extracting...
+     src='${filename}'
+     dst='${directory}'")
+
+if(NOT EXISTS "${filename}")
+  message(FATAL_ERROR "File to extract does not exist: '${filename}'")
+endif()
+
+# Prepare a space for extracting:
+#
+set(i 1234)
+while(EXISTS "${directory}/../ex-@name@${i}")
+  math(EXPR i "${i} + 1")
+endwhile()
+set(ut_dir "${directory}/../ex-@name@${i}")
+file(MAKE_DIRECTORY "${ut_dir}")
+
+# Extract it:
+#
+message(STATUS "extracting... [tar @args@]")
+execute_process(COMMAND ${CMAKE_COMMAND} -E tar @args@ ${filename}
+  WORKING_DIRECTORY ${ut_dir}
+  RESULT_VARIABLE rv)
+
+if(NOT rv EQUAL 0)
+  message(STATUS "extracting... [error clean up]")
+  file(REMOVE_RECURSE "${ut_dir}")
+  message(FATAL_ERROR "Extract of '${filename}' failed")
+endif()
+
+# Analyze what came out of the tar file:
+#
+message(STATUS "extracting... [analysis]")
+file(GLOB contents "${ut_dir}/*")
+list(REMOVE_ITEM contents "${ut_dir}/.DS_Store")
+list(LENGTH contents n)
+if(NOT n EQUAL 1 OR NOT IS_DIRECTORY "${contents}")
+  set(contents "${ut_dir}")
+endif()
+
+# Move "the one" directory to the final directory:
+#
+message(STATUS "extracting... [rename]")
+file(REMOVE_RECURSE ${directory})
+get_filename_component(contents ${contents} ABSOLUTE)
+file(RENAME ${contents} ${directory})
+
+# Clean up:
+#
+message(STATUS "extracting... [clean up]")
+file(REMOVE_RECURSE "${ut_dir}")
+
+message(STATUS "extracting... done")