Refactor cmake (#24)

* Refactor cmake

* small fixes

cmake/googletest.cmake

@@ -14,18 +14,26 @@
 # limitations under the License.
 
 function(download_googltest)
-  if(CMAKE_VERSION VERSION_LESS 3.11)
-    # FetchContent is available since 3.11,
-    # we've copied it to ${CMAKE_SOURCE_DIR}/cmake/Modules
-    # so that it can be used in lower CMake versions.
-    message(STATUS "Use FetchContent provided by sherpa-onnx")
-    list(APPEND CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake/Modules)
-  endif()
-
   include(FetchContent)
 
-  set(googletest_URL  "https://github.com/google/googletest/archive/release-1.10.0.tar.gz")
-  set(googletest_HASH "SHA256=9dc9157a9a1551ec7a7e43daea9a694a0bb5fb8bec81235d8a1e6ef64c716dcb")
+  set(googletest_URL  "https://github.com/google/googletest/archive/refs/tags/v1.13.0.tar.gz")
+  set(googletest_HASH "SHA256=ad7fdba11ea011c1d925b3289cf4af2c66a352e18d4c7264392fead75e919363")
+
+  # If you don't have access to the Internet,
+  # please pre-download googletest
+  set(possible_file_locations
+    $ENV{HOME}/Downloads/googletest-1.13.0.tar.gz
+    ${PROJECT_SOURCE_DIR}/googletest-1.13.0.tar.gz
+    ${PROJECT_BINARY_DIR}/googletest-1.13.0.tar.gz
+    /tmp/googletest-1.13.0.tar.gz
+  )
+
+  foreach(f IN LISTS possible_file_locations)
+    if(EXISTS ${f})
+      set(googletest_URL  "file://${f}")
+      break()
+    endif()
+  endforeach()
 
   set(BUILD_GMOCK ON CACHE BOOL "" FORCE)
   set(INSTALL_GTEST OFF CACHE BOOL "" FORCE)
@@ -39,7 +47,7 @@ function(download_googltest)
 
   FetchContent_GetProperties(googletest)
   if(NOT googletest_POPULATED)
-    message(STATUS "Downloading googletest")
+    message(STATUS "Downloading googletest from ${googletest_URL}")
     FetchContent_Populate(googletest)
   endif()
   message(STATUS "googletest is downloaded to ${googletest_SOURCE_DIR}")