tools/activate-emsdk

#!/usr/bin/env python3

# Copyright 2025 Google LLC
#
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import argparse
import os
import subprocess
import sys
import sysconfig
import textwrap

EMSDK_ROOT = os.path.join('third_party', 'emsdk')

EMSDK_PATH = os.path.join(EMSDK_ROOT, 'emsdk.py')
EMSDK_CONFIG_PATH = os.path.join(EMSDK_ROOT, '.emscripten')

EMSDK_VERSION = '4.0.3'

def main(args):
    parser = argparse.ArgumentParser()
    parser.add_argument('--get-emsdk-version', help='Print emsdk version and exit.', action='store_true')
    parser.add_argument('--node', help='Path to nodejs binary.')
    parser.add_argument('--llvm', help='Path to LLVM binaries.')
    options = parser.parse_args()

    if options.get_emsdk_version:
        print(EMSDK_VERSION)
        return 0

    # Install and activate the default dependencies for emsdk.
    try:
        subprocess.check_call([sys.executable, EMSDK_PATH, 'install', EMSDK_VERSION])
    except subprocess.CalledProcessError:
        print ('Failed to install emsdk')
        return 1
    try:
        subprocess.check_call([sys.executable, EMSDK_PATH, 'activate', EMSDK_VERSION])
    except subprocess.CalledProcessError:
        print ('Failed to activate emsdk')
        return 1

    # Append overrides to the default .emscripten file for certain binaries.
    em_overrides = '''
# Overrides from dawn/tools/activate-emsdk:
del PYTHON
'''
    if options.node:
        em_overrides += f"NODE_JS = emsdk_path + '/../../{options.node}'\n"
    if options.llvm:
        em_overrides += f"LLVM_ROOT = emsdk_path + '/../../{options.llvm}'\n"
    with open(EMSDK_CONFIG_PATH, 'a') as f:
        f.write(em_overrides)


if __name__ == '__main__':
  sys.exit(main(sys.argv))