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# Copyright 2020 The Emscripten Authors. All rights reserved.
# Emscripten is available under two separate licenses, the MIT license and the
# University of Illinois/NCSA Open Source License. Both these licenses can be
# found in the LICENSE file.
import contextlib
import os
import sys
from . import diagnostics
__rootpath__ = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
WINDOWS = sys.platform.startswith('win')
MACOS = sys.platform == 'darwin'
LINUX = sys.platform.startswith('linux')
def exit_with_error(msg, *args):
diagnostics.error(msg, *args)
def path_from_root(*pathelems):
return os.path.join(__rootpath__, *pathelems)
def safe_ensure_dirs(dirname):
try:
os.makedirs(dirname)
except OSError:
# Python 2 compatibility: makedirs does not support exist_ok parameter
# Ignore error for already existing dirname as exist_ok does
if not os.path.isdir(dirname):
raise
@contextlib.contextmanager
def chdir(dir):
"""A context manager that performs actions in the given directory."""
orig_cwd = os.getcwd()
os.chdir(dir)
try:
yield
finally:
os.chdir(orig_cwd)
# Finds the given executable 'program' in PATH. Operates like the Unix tool 'which'.
def which(program):
def is_exe(fpath):
return os.path.isfile(fpath) and os.access(fpath, os.X_OK)
if os.path.isabs(program):
if os.path.isfile(program):
return program
if WINDOWS:
for suffix in ['.exe', '.cmd', '.bat']:
if is_exe(program + suffix):
return program + suffix
fpath, fname = os.path.split(program)
if fpath:
if is_exe(program):
return program
else:
for path in os.environ["PATH"].split(os.pathsep):
path = path.strip('"')
exe_file = os.path.join(path, program)
if is_exe(exe_file):
return exe_file
if WINDOWS:
for suffix in ('.exe', '.cmd', '.bat'):
if is_exe(exe_file + suffix):
return exe_file + suffix
return None
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