#!/bin/sh
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

# The beginning of this script is both valid POSIX shell and valid Python,
# such that the script starts with the shell and is reexecuted with
# the right Python.

# Embeds a shell script inside a Python triple quote. This pattern is valid
# shell because `''':'`, `':'` and `:` are all equivalent, and `:` is a no-op.
''':'

get_command() {
    # Parse the name of the mach command out of the arguments. This is necessary
    # in the presence of global mach arguments that come before the name of the
    # command, e.g. `mach -v build`. We dispatch to the correct Python
    # interpreter depending on the command.
    while true; do
    case $1 in
        -v|--verbose) shift;;
        -l|--log-file)
            if [ "$#" -lt 2 ]
            then
                echo
                break
            else
                shift 2
            fi
            ;;
        --no-interactive) shift;;
        --log-interval) shift;;
        --log-no-times) shift;;
        -h) shift;;
        --debug-command) shift;;
        --profile-command)
            py_profile_command="1"
            shift;;
        --settings)
            if [ "$#" -lt 2 ]
            then
                echo
                break
            else
                shift 2
            fi
            ;;
        "") echo; break;;
        *) echo $1; break;;
    esac
    done
    return ${py_profile_command}
}

command=$(get_command "$@")
py_profile_command=$?

if [ ${py_profile_command} -eq 0 ]
then
    py_profile_command_args=""
else
    # We would prefer to use an array variable here, but we're limited to POSIX.
    # None of our arguments have quoting or spaces so we can safely interpolate
    # a string instead.
    py_profile_command_args="-m cProfile -o mach_profile_${command}.cProfile"
    echo "Running with --profile-command.  To visualize, use snakeviz:"
    echo "python3 -m pip install snakeviz"
    echo "python3 -m snakeviz mach_profile_${command}.cProfile"
fi

if command -v python3 > /dev/null
then
    exec python3 $py_profile_command_args "$0" "$@"
else
    echo "This mach command requires 'python3', which wasn't found on the system!"
    exit 1
fi
'''

from __future__ import absolute_import, print_function, unicode_literals

import os
import sys


def load_mach(dir_path, mach_path):
    import importlib.util
    spec = importlib.util.spec_from_file_location('mach_initialize', mach_path)
    mach_initialize = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(mach_initialize)
    return mach_initialize.initialize(dir_path)


def check_and_get_mach(dir_path):
    initialize_paths = (
        # Run Thunderbird's mach_initialize.py if it exists
        'comm/build/mach_initialize.py',
        'build/mach_initialize.py',
        # test package initialize
        'tools/mach_initialize.py',
    )
    for initialize_path in initialize_paths:
        mach_path = os.path.join(dir_path, initialize_path)
        if os.path.isfile(mach_path):
            return load_mach(dir_path, mach_path)
    return None


def main(args):
    # XCode python sets __PYVENV_LAUNCHER__, which overrides the executable
    # used when a python subprocess is created. This is an issue when we want
    # to run using our virtualenv python executables.
    # In future Python relases, __PYVENV_LAUNCHER__ will be cleared before
    # application code (mach) is started.
    # https://github.com/python/cpython/pull/9516
    os.environ.pop("__PYVENV_LAUNCHER__", None)

    mach = check_and_get_mach(os.path.dirname(os.path.realpath(__file__)))
    if not mach:
        print('Could not run mach: No mach source directory found.')
        sys.exit(1)
    sys.exit(mach.run(args))


if __name__ == '__main__':
    main(sys.argv[1:])