Added provider option to sherpa-onnx and decode-file-c-api (#162)

cmake/cargs.cmake

@@ -0,0 +1,36 @@
+function(download_cargs)
+  include(FetchContent)
+
+  set(cargs_URL "https://github.com/likle/cargs/archive/refs/tags/v1.0.3.tar.gz")
+  set(cargs_HASH "SHA256=ddba25bd35e9c6c75bc706c126001b8ce8e084d40ef37050e6aa6963e836eb8b")
+
+  # If you don't have access to the Internet,
+  # please pre-download asio
+  set(possible_file_locations
+    $ENV{HOME}/Downloads/cargs-v1-0-3.tar.gz
+    ${PROJECT_SOURCE_DIR}/cargs-v1-0-3.tar.gz
+    ${PROJECT_BINARY_DIR}/cargs-v1-0-3.tar.gz
+    /tmp/cargs-v1-0-3.tar.gz
+    /star-fj/fangjun/download/github/cargs-v1-0-3.tar.gz
+  )
+
+  foreach(f IN LISTS possible_file_locations)
+    if(EXISTS ${f})
+      set(cargs_URL  "${f}")
+      file(TO_CMAKE_PATH "${cargs_URL}" cargs_URL)
+      break()
+    endif()
+  endforeach()
+
+  FetchContent_Declare(cargs URL ${cargs_URL} URL_HASH ${cargs_HASH})
+
+  FetchContent_GetProperties(cargs)
+  if(NOT cargs_POPULATED)
+    message(STATUS "Downloading cargs ${cargs_URL}")
+    FetchContent_Populate(cargs)
+  endif()
+  message(STATUS "cargs is downloaded to ${cargs_SOURCE_DIR}")
+  add_subdirectory(${cargs_SOURCE_DIR} ${cargs_BINARY_DIR} EXCLUDE_FROM_ALL)
+endfunction()
+
+download_cargs()