idf.py

#!/usr/bin/env python
#
# SPDX-FileCopyrightText: 2019-2024 Espressif Systems (Shanghai) CO LTD
#
# SPDX-License-Identifier: Apache-2.0
#
# 'idf.py' is a top-level config/build command line tool for ESP-IDF
#
# You don't have to use idf.py, you can use cmake directly
# (or use cmake in an IDE)
# WARNING: we don't check for Python build-time dependencies until
# check_environment() function below. If possible, avoid importing
# any external libraries here - put in external script, or import in
# their specific function instead.
import codecs
import glob
import json
import locale
import os.path
import shlex
import subprocess
import sys
from collections import Counter
from collections import OrderedDict
from collections.abc import KeysView
from importlib import import_module
from pkgutil import iter_modules
from typing import Any
from typing import Callable
from typing import Dict
from typing import List
from typing import Optional
from typing import Union

# pyc files remain in the filesystem when switching between branches which might raise errors for incompatible
# idf.py extensions. Therefore, pyc file generation is turned off:
sys.dont_write_bytecode = True

import python_version_checker  # noqa: E402

try:
    from idf_py_actions.errors import FatalError  # noqa: E402
    from idf_py_actions.tools import (PROG, SHELL_COMPLETE_RUN, SHELL_COMPLETE_VAR, PropertyDict,  # noqa: E402
                                      debug_print_idf_version, get_target, merge_action_lists, print_warning)
    if os.getenv('IDF_COMPONENT_MANAGER') != '0':
        from idf_component_manager import idf_extensions
except ImportError as e:
    print((f'{e}\n'
           f'This usually means that "idf.py" was not '
           f'spawned within an ESP-IDF shell environment or the python virtual '
           f'environment used by "idf.py" is corrupted.\n'
           f'Please use idf.py only in an ESP-IDF shell environment. If problem persists, '
           f'please try to install ESP-IDF tools again as described in the Get Started guide.'),
          file=sys.stderr)
    if e.name is None:
        # The ImportError or ModuleNotFoundError might be raised without
        # specifying a module name. In this not so common situation, re-raise
        # the exception to print all the information that could assist in
        # identifying the problem.
        raise

    sys.exit(1)

# Use this Python interpreter for any subprocesses we launch
PYTHON = sys.executable

# note: os.environ changes don't automatically propagate to child processes,
# you have to pass env=os.environ explicitly anywhere that we create a process
os.environ['PYTHON'] = sys.executable


def check_environment() -> List:
    """
    Verify the environment contains the top-level tools we need to operate

    (cmake will check a lot of other things)
    """
    checks_output = []

    # verify that IDF_PATH env variable is set
    # find the directory idf.py is in, then the parent directory of this, and assume this is IDF_PATH
    detected_idf_path = os.path.realpath(os.path.join(os.path.dirname(__file__), '..'))
    if 'IDF_PATH' in os.environ:
        set_idf_path = os.path.realpath(os.environ['IDF_PATH'])
        if set_idf_path != detected_idf_path:
            print_warning(
                'WARNING: IDF_PATH environment variable is set to %s but %s path indicates IDF directory %s. '
                'Using the environment variable directory, but results may be unexpected...' %
                (set_idf_path, PROG, detected_idf_path))
    else:
        print_warning('Setting IDF_PATH environment variable: %s' % detected_idf_path)
        os.environ['IDF_PATH'] = detected_idf_path

    try:
        # The Python compatibility check could have been done earlier (tools/detect_python.{sh,fish}) but PATH is
        # not set for import at that time. Even if the check would be done before, the same check needs to be done
        # here as well (for example one can call idf.py from a not properly set-up environment).
        python_version_checker.check()
    except RuntimeError as e:
        raise FatalError(e)

    # check Python dependencies
    checks_output.append('Checking Python dependencies...')
    try:
        out = subprocess.check_output(
            [
                os.environ['PYTHON'],
                os.path.join(os.environ['IDF_PATH'], 'tools', 'idf_tools.py'),
                'check-python-dependencies',
            ],
            env=os.environ,
        )

        checks_output.append(out.decode('utf-8', 'ignore').strip())
    except subprocess.CalledProcessError as e:
        print_warning(e.output.decode('utf-8', 'ignore'), stream=sys.stderr)
        debug_print_idf_version()
        raise SystemExit(1)

    # Check used Python interpreter
    checks_output.append('Checking used Python interpreter...')
    try:
        python_venv_path = os.environ['IDF_PYTHON_ENV_PATH']
        if python_venv_path and not sys.executable.startswith(python_venv_path):
            print_warning(f'WARNING: Python interpreter "{sys.executable}" used to start idf.py is not from installed venv "{python_venv_path}"')
    except KeyError:
        print_warning('WARNING: The IDF_PYTHON_ENV_PATH is missing in environmental variables!')

    return checks_output


def _safe_relpath(path: str, start: Optional[str]=None) -> str:
    """ Return a relative path, same as os.path.relpath, but only if this is possible.

    It is not possible on Windows, if the start directory and the path are on different drives.
    """
    try:
        return os.path.relpath(path, os.curdir if start is None else start)
    except ValueError:
        return os.path.abspath(path)


def init_cli(verbose_output: Optional[List]=None) -> Any:
    # Click is imported here to run it after check_environment()
    import click
    from click.shell_completion import CompletionItem

    class Deprecation(object):
        """Construct deprecation notice for help messages"""
        def __init__(self, deprecated: Union[Dict, str, bool]=False) -> None:
            self.deprecated = deprecated
            self.since = None
            self.removed = None
            self.exit_with_error = None
            self.custom_message = ''

            if isinstance(deprecated, dict):
                self.custom_message = deprecated.get('message', '')
                self.since = deprecated.get('since', None)
                self.removed = deprecated.get('removed', None)
                self.exit_with_error = deprecated.get('exit_with_error', None)
            elif isinstance(deprecated, str):
                self.custom_message = deprecated

        def full_message(self, type: str='Option') -> str:
            if self.exit_with_error:
                return '%s is deprecated %sand was removed%s.%s' % (
                    type,
                    'since %s ' % self.since if self.since else '',
                    ' in %s' % self.removed if self.removed else '',
                    ' %s' % self.custom_message if self.custom_message else '',
                )
            else:
                return '%s is deprecated %sand will be removed in%s.%s' % (
                    type,
                    'since %s ' % self.since if self.since else '',
                    ' %s' % self.removed if self.removed else ' future versions',
                    ' %s' % self.custom_message if self.custom_message else '',
                )

        def help(self, text: str, type: str='Option', separator: str=' ') -> str:
            text = text or ''
            return self.full_message(type) + separator + text if self.deprecated else text

        def short_help(self, text: str) -> str:
            text = text or ''
            return ('Deprecated! ' + text) if self.deprecated else text

    def check_deprecation(ctx: click.core.Context) -> None:
        """Prints deprecation warnings for arguments in given context"""
        for option in ctx.command.params:
            default = () if option.multiple else option.default
            if isinstance(option, Option) and option.deprecated and ctx.params[option.name] != default:
                deprecation = Deprecation(option.deprecated)
                if deprecation.exit_with_error:
                    raise FatalError('Error: %s' % deprecation.full_message('Option "%s"' % option.name))
                else:
                    print_warning('Warning: %s' % deprecation.full_message('Option "%s"' % option.name))

    class Task(object):
        def __init__(self, callback: Callable, name: str, aliases: List, dependencies: Optional[List],
                     order_dependencies: Optional[List], action_args: Dict) -> None:
            self.callback = callback
            self.name = name
            self.dependencies = dependencies
            self.order_dependencies = order_dependencies
            self.action_args = action_args
            self.aliases = aliases

        def __call__(self, context: click.core.Context, global_args: PropertyDict, action_args: Optional[Dict]=None) -> None:
            if action_args is None:
                action_args = self.action_args

            self.callback(self.name, context, global_args, **action_args)

    class Action(click.Command):
        def __init__(
                self,
                name: Optional[str]=None,
                aliases: Optional[List]=None,
                deprecated: Union[Dict, str, bool]=False,
                dependencies: Optional[List]=None,
                order_dependencies: Optional[List]=None,
                hidden: bool=False,
                **kwargs: Any) -> None:
            super(Action, self).__init__(name, **kwargs)

            self.name: str = self.name or self.callback.__name__
            self.deprecated: Union[Dict, str, bool] = deprecated
            self.hidden: bool = hidden

            if aliases is None:
                aliases = []
            self.aliases = aliases

            self.help: str = self.help or self.callback.__doc__ or ''

            if dependencies is None:
                dependencies = []

            if order_dependencies is None:
                order_dependencies = []

            # Show first line of help if short help is missing
            self.short_help: str = self.short_help or self.help.split('\n')[0]

            if deprecated:
                deprecation = Deprecation(deprecated)
                self.short_help = deprecation.short_help(self.short_help)
                self.help = deprecation.help(self.help, type='Command', separator='\n')

            # Add aliases to help string
            if aliases:
                aliases_help = 'Aliases: %s.' % ', '.join(aliases)

                self.help = '\n'.join([self.help, aliases_help])
                self.short_help = ' '.join([aliases_help, self.short_help])

            self.unwrapped_callback = self.callback
            if self.callback is not None:

                def wrapped_callback(**action_args: Any) -> Task:
                    return Task(
                        callback=self.unwrapped_callback,
                        name=self.name,
                        dependencies=dependencies,
                        order_dependencies=order_dependencies,
                        action_args=action_args,
                        aliases=self.aliases,
                    )

                self.callback = wrapped_callback

        def invoke(self, ctx: click.core.Context) -> click.core.Context:
            if self.deprecated:
                deprecation = Deprecation(self.deprecated)
                message = deprecation.full_message('Command "%s"' % self.name)

                if deprecation.exit_with_error:
                    raise FatalError('Error: %s' % message)
                else:
                    print_warning('Warning: %s' % message)

                self.deprecated = False  # disable Click's built-in deprecation handling

            # Print warnings for options
            check_deprecation(ctx)
            return super(Action, self).invoke(ctx)

    class Argument(click.Argument):
        """
        Positional argument

        names - alias of 'param_decls'
        """
        def __init__(self, **kwargs: str):
            names = kwargs.pop('names')
            super(Argument, self).__init__(names, **kwargs)

    class Scope(object):
        """
            Scope for sub-command option.
            possible values:
            - default - only available on defined level (global/action)
            - global - When defined for action, also available as global
            - shared - Opposite to 'global': when defined in global scope, also available for all actions
        """

        SCOPES = ('default', 'global', 'shared')

        def __init__(self, scope: Optional[Union['Scope', str]]=None) -> None:  # noqa: F821
            if scope is None:
                self._scope = 'default'
            elif isinstance(scope, str) and scope in self.SCOPES:
                self._scope = scope
            elif isinstance(scope, Scope):
                self._scope = str(scope)
            else:
                raise FatalError('Unknown scope for option: %s' % scope)

        @property
        def is_global(self) -> bool:
            return self._scope == 'global'

        @property
        def is_shared(self) -> bool:
            return self._scope == 'shared'

        def __str__(self) -> str:
            return self._scope

    class Option(click.Option):
        """Option that knows whether it should be global"""
        def __init__(self, scope: Optional[Union[Scope, str]]=None, deprecated: Union[Dict, str, bool]=False, hidden: bool=False, **kwargs: str) -> None:
            """
            Keyword arguments additional to Click's Option class:

            names - alias of 'param_decls'
            deprecated - marks option as deprecated. May be boolean, string (with custom deprecation message)
            or dict with optional keys:
                since: version of deprecation
                removed: version when option will be removed
                custom_message:  Additional text to deprecation warning
            """

            kwargs['param_decls'] = kwargs.pop('names')
            super(Option, self).__init__(**kwargs)

            self.deprecated = deprecated
            self.scope = Scope(scope)
            self.hidden = hidden

            if deprecated:
                deprecation = Deprecation(deprecated)
                self.help: str = deprecation.help(self.help)

            if self.envvar:
                self.help += ' The default value can be set with the %s environment variable.' % self.envvar

            if self.scope.is_global:
                self.help += ' This option can be used at most once either globally, or for one subcommand.'

        def get_help_record(self, ctx: click.core.Context) -> Any:
            # Backport "hidden" parameter to click 5.0
            if self.hidden:
                return None

            return super(Option, self).get_help_record(ctx)

    class CLI(click.MultiCommand):
        """Action list contains all actions with options available for CLI"""
        def __init__(self, all_actions: Optional[Dict]=None, verbose_output: Optional[List]=None, help: Optional[str]=None) -> None:
            super(CLI, self).__init__(
                chain=True,
                invoke_without_command=True,
                result_callback=self.execute_tasks,
                no_args_is_help=True,
                context_settings={'max_content_width': 140},
                help=help,
            )
            self._actions = {}
            self.global_action_callbacks = []
            self.commands_with_aliases = {}

            if verbose_output is None:
                verbose_output = []

            self.verbose_output = verbose_output

            if all_actions is None:
                all_actions = {}

            shared_options = []

            # Global options
            for option_args in all_actions.get('global_options', []):
                option = Option(**option_args)
                self.params.append(option)

                if option.scope.is_shared:
                    shared_options.append(option)

            # Global options validators
            self.global_action_callbacks = all_actions.get('global_action_callbacks', [])

            # Actions
            for name, action in all_actions.get('actions', {}).items():
                arguments = action.pop('arguments', [])
                options = action.pop('options', [])

                if arguments is None:
                    arguments = []

                if options is None:
                    options = []

                self._actions[name] = Action(name=name, **action)
                for alias in [name] + action.get('aliases', []):
                    self.commands_with_aliases[alias] = name

                for argument_args in arguments:
                    self._actions[name].params.append(Argument(**argument_args))

                # Add all shared options
                for option in shared_options:
                    self._actions[name].params.append(option)

                for option_args in options:
                    option = Option(**option_args)

                    if option.scope.is_shared:
                        raise FatalError(
                            '"%s" is defined for action "%s". '
                            ' "shared" options can be declared only on global level' % (option.name, name))

                    # Promote options to global if see for the first time
                    if option.scope.is_global and option.name not in [o.name for o in self.params]:
                        self.params.append(option)

                    self._actions[name].params.append(option)

        def list_commands(self, ctx: click.core.Context) -> List:
            return sorted(filter(lambda name: not self._actions[name].hidden, self._actions))

        def get_command(self, ctx: click.core.Context, name: str) -> Optional[Action]:
            if name in self.commands_with_aliases:
                return self._actions.get(self.commands_with_aliases.get(name))

            # Trying fallback to build target (from "all" action) if command is not known
            else:
                callback = self._actions.get('fallback')
                if callback:
                    return Action(name=name, callback=callback.unwrapped_callback)
                return None

        def shell_complete(self, ctx: click.core.Context, incomplete: str) -> List[CompletionItem]:
            if incomplete.startswith('@'):
                path_prefix = incomplete[1:]
                candidates = glob.glob(path_prefix + '*')
                result = [CompletionItem(f'@{c}') for c in candidates]
                return result
            return super(CLI, self).shell_complete(ctx, incomplete)  # type: ignore

        def _print_closing_message(self, args: PropertyDict, actions: KeysView) -> None:
            # print a closing message of some kind,
            # except if any of the following actions were requested
            if any(t in str(actions) for t in ('flash', 'dfu', 'uf2', 'uf2-app', 'qemu')):
                print('Done')
                return

            if not os.path.exists(os.path.join(args.build_dir, 'flasher_args.json')):
                print('Done')
                return

            # Otherwise, if we built any binaries print a message about
            # how to flash them
            def print_flashing_message(title: str, key: str) -> None:
                with open(os.path.join(args.build_dir, 'flasher_args.json')) as file:
                    flasher_args: Dict[str, Any] = json.load(file)

                def flasher_path(f: Union[str, 'os.PathLike[str]']) -> str:
                    if type(args.build_dir) is bytes:
                        args.build_dir = args.build_dir.decode()
                    return _safe_relpath(os.path.join(args.build_dir, f))

                if key != 'project':  # flashing a single item
                    if key not in flasher_args:
                        # This is the case for 'idf.py bootloader' if Secure Boot is on, need to follow manual flashing steps
                        print('\n%s build complete.' % title)
                        return
                    cmd = ''
                    if (key == 'bootloader'):  # bootloader needs --flash-mode, etc to be passed in
                        cmd = ' '.join(flasher_args['write_flash_args']) + ' '

                    cmd += flasher_args[key]['offset'] + ' '
                    cmd += flasher_path(flasher_args[key]['file'])
                else:  # flashing the whole project
                    cmd = ' '.join(flasher_args['write_flash_args']) + ' '
                    flash_items = sorted(
                        ((o, f) for (o, f) in flasher_args['flash_files'].items() if len(o) > 0),
                        key=lambda x: int(x[0], 0),
                    )
                    for o, f in flash_items:
                        cmd += o + ' ' + flasher_path(f) + ' '

                flash_target = 'flash' if key == 'project' else f'{key}-flash'
                print(f'{os.linesep}{title} build complete. To flash, run:')
                print(f' idf.py {flash_target}')
                if args.port:
                    print('or')
                    print(f' idf.py -p {args.port} {flash_target}')
                print('or')
                print(f' idf.py -p PORT {flash_target}')

                esptool_cmd = ['python -m esptool',
                               '--chip {}'.format(flasher_args['extra_esptool_args']['chip']),
                               f'-b {args.baud}',
                               '--before {}'.format(flasher_args['extra_esptool_args']['before']),
                               '--after {}'.format(flasher_args['extra_esptool_args']['after'])]

                if not flasher_args['extra_esptool_args']['stub']:
                    esptool_cmd += ['--no-stub']

                if args.port:
                    esptool_cmd += [f'-p {args.port}']

                esptool_cmd += ['write_flash']

                print('or')
                print(' {}'.format(' '.join(esptool_cmd + [cmd.strip()])))

                if os.path.exists(os.path.join(args.build_dir, 'flash_args')):
                    print(f'or from the "{args.build_dir}" directory')
                    print(' {}'.format(' '.join(esptool_cmd + ['"@flash_args"'])))

            if 'all' in actions or 'build' in actions:
                print_flashing_message('Project', 'project')
            else:
                if 'app' in actions:
                    print_flashing_message('App', 'app')
                if 'partition-table' in actions:
                    print_flashing_message('Partition Table', 'partition-table')
                if 'bootloader' in actions:
                    print_flashing_message('Bootloader', 'bootloader')

        def execute_tasks(self, tasks: List, **kwargs: str) -> OrderedDict:
            ctx = click.get_current_context()
            global_args = PropertyDict(kwargs)

            # Show warning if some tasks are present several times in the list
            dupplicated_tasks = sorted(
                [item for item, count in Counter(task.name for task in tasks).items() if count > 1])
            if dupplicated_tasks:
                dupes = ', '.join('"%s"' % t for t in dupplicated_tasks)

                print_warning(
                    'WARNING: Command%s found in the list of commands more than once. ' %
                    ('s %s are' % dupes if len(dupplicated_tasks) > 1 else ' %s is' % dupes) +
                    'Only first occurrence will be executed.')

            for task in tasks:
                # Set propagated global options.
                # These options may be set on one subcommand, but available in the list of global arguments
                for key in list(task.action_args):
                    option = next((o for o in ctx.command.params if o.name == key), None)

                    if option and (option.scope.is_global or option.scope.is_shared):
                        local_value = task.action_args.pop(key)
                        global_value = global_args[key]
                        default = () if option.multiple else option.default

                        if global_value != default and local_value != default and global_value != local_value:
                            if hasattr(option, 'envvar') and option.envvar and os.getenv(option.envvar) != default:
                                msg = (f'This option cannot be set in command line if the {option.envvar} '
                                       'environment variable is set to a different value.')
                            else:
                                msg = 'This option can appear at most once in the command line.'

                            raise FatalError(f'Option "{key}" provided for "{task.name}" is already defined to '
                                             f'a different value. {msg}')
                        if local_value != default:
                            global_args[key] = local_value

            # Show warnings about global arguments
            check_deprecation(ctx)

            # Make sure that define_cache_entry is mutable list and can be modified in callbacks
            global_args.define_cache_entry = list(global_args.define_cache_entry)

            # Execute all global action callback - first from idf.py itself, then from extensions
            for action_callback in ctx.command.global_action_callbacks:
                action_callback(ctx, global_args, tasks)

            # Build full list of tasks to and deal with dependencies and order dependencies
            tasks_to_run: OrderedDict = OrderedDict()
            while tasks:
                task = tasks[0]
                tasks_dict = dict([(t.name, t) for t in tasks])

                dependecies_processed = True

                # If task have some dependencies they have to be executed before the task.
                for dep in task.dependencies:
                    if dep not in tasks_to_run.keys():
                        # If dependent task is in the list of unprocessed tasks move to the front of the list
                        if dep in tasks_dict.keys():
                            dep_task = tasks.pop(tasks.index(tasks_dict[dep]))
                        # Otherwise invoke it with default set of options
                        # and put to the front of the list of unprocessed tasks
                        else:
                            print(
                                'Adding "%s"\'s dependency "%s" to list of commands with default set of options.' %
                                (task.name, dep))
                            dep_task = ctx.invoke(ctx.command.get_command(ctx, dep))

                            # Remove options with global scope from invoke tasks because they are already in global_args
                            for key in list(dep_task.action_args):
                                option = next((o for o in ctx.command.params if o.name == key), None)
                                if option and (option.scope.is_global or option.scope.is_shared):
                                    dep_task.action_args.pop(key)

                        tasks.insert(0, dep_task)
                        dependecies_processed = False

                # Order only dependencies are moved to the front of the queue if they present in command list
                for dep in task.order_dependencies:
                    if dep in tasks_dict.keys() and dep not in tasks_to_run.keys():
                        tasks.insert(0, tasks.pop(tasks.index(tasks_dict[dep])))
                        dependecies_processed = False

                if dependecies_processed:
                    # Remove task from list of unprocessed tasks
                    tasks.pop(0)

                    # And add to the queue
                    if task.name not in tasks_to_run.keys():
                        tasks_to_run.update([(task.name, task)])

            # Run all tasks in the queue
            # when global_args.dry_run is true idf.py works in idle mode and skips actual task execution
            if not global_args.dry_run:
                for task in tasks_to_run.values():
                    name_with_aliases = task.name
                    if task.aliases:
                        name_with_aliases += ' (aliases: %s)' % ', '.join(task.aliases)

                    # When machine-readable json format for help is printed, don't show info about executing action so the output is deserializable
                    if name_with_aliases != 'help' or not task.action_args.get('json_option', False):
                        print('Executing action: %s' % name_with_aliases)
                    task(ctx, global_args, task.action_args)

                self._print_closing_message(global_args, tasks_to_run.keys())

            return tasks_to_run

    # That's a tiny parser that parse project-dir even before constructing
    # fully featured click parser to be sure that extensions are loaded from the right place
    @click.command(
        add_help_option=False,
        context_settings={
            'allow_extra_args': True,
            'ignore_unknown_options': True
        },
    )
    @click.option('-C', '--project-dir', default=os.getcwd(), type=click.Path())
    def parse_project_dir(project_dir: str) -> Any:
        return os.path.realpath(project_dir)

    # Set `complete_var` to not existing environment variable name to prevent early cmd completion
    project_dir = parse_project_dir(standalone_mode=False, complete_var='_IDF.PY_COMPLETE_NOT_EXISTING')

    all_actions: Dict = {}
    # Load extensions from components dir
    idf_py_extensions_path = os.path.join(os.environ['IDF_PATH'], 'tools', 'idf_py_actions')
    extension_dirs = [os.path.realpath(idf_py_extensions_path)]
    extra_paths = os.environ.get('IDF_EXTRA_ACTIONS_PATH')
    if extra_paths is not None:
        for path in extra_paths.split(';'):
            path = os.path.realpath(path)
            if path not in extension_dirs:
                extension_dirs.append(path)

    extensions = []
    for directory in extension_dirs:
        if directory and not os.path.exists(directory):
            print_warning('WARNING: Directory with idf.py extensions doesn\'t exist:\n    %s' % directory)
            continue

        sys.path.append(directory)
        for _finder, name, _ispkg in sorted(iter_modules([directory])):
            if name.endswith('_ext'):
                extensions.append((name, import_module(name)))

    # Load component manager idf.py extensions if not explicitly disabled
    if os.getenv('IDF_COMPONENT_MANAGER') != '0':
        extensions.append(('component_manager_ext', idf_extensions))

    # Optional load `pyclang` for additional clang-tidy related functionalities
    try:
        from pyclang import idf_extension

        extensions.append(('idf_clang_tidy_ext', idf_extension))
    except ImportError:
        pass

    for name, extension in extensions:
        try:
            all_actions = merge_action_lists(all_actions, extension.action_extensions(all_actions, project_dir))
        except AttributeError:
            print_warning('WARNING: Cannot load idf.py extension "%s"' % name)

    # Load extensions from project dir
    if os.path.exists(os.path.join(project_dir, 'idf_ext.py')):
        sys.path.append(project_dir)
        try:
            from idf_ext import action_extensions
        except ImportError:
            print_warning('Error importing extension file idf_ext.py. Skipping.')
            print_warning(
                "Please make sure that it contains implementation (even if it's empty) of add_action_extensions")

        try:
            all_actions = merge_action_lists(all_actions, action_extensions(all_actions, project_dir))
        except NameError:
            pass

    cli_help = (
        'ESP-IDF CLI build management tool. '
        'For commands that are not known to idf.py an attempt to execute it as a build system target will be made. '
        'Selected target: {}'.format(get_target(project_dir)))

    return CLI(help=cli_help, verbose_output=verbose_output, all_actions=all_actions)


def main(argv: Optional[List[Any]] = None) -> None:
    # Check the environment only when idf.py is invoked regularly from command line.
    checks_output = None if SHELL_COMPLETE_RUN else check_environment()

    # Check existence of the current working directory to prevent exceptions from click cli.
    try:
        os.getcwd()
    except FileNotFoundError as e:
        raise FatalError(f'ERROR: {e}. Working directory cannot be established. Check its existence.')

    try:
        cli = init_cli(verbose_output=checks_output)
    except ImportError:
        if SHELL_COMPLETE_RUN:
            pass
        else:
            raise
    else:
        argv = expand_file_arguments(argv or sys.argv[1:])

        cli(argv, prog_name=PROG, complete_var=SHELL_COMPLETE_VAR)


def expand_file_arguments(argv: List[Any]) -> List[Any]:
    """
    Any argument starting with "@" gets replaced with all values read from a text file.
    Text file arguments can be split by newline or by space.
    Values are added "as-is", as if they were specified in this order
    on the command line.
    """
    visited = set()
    expanded = False

    def expand_args(args: List[Any], parent_path: str, file_stack: List[str]) -> List[str]:
        expanded_args = []
        for arg in args:
            if not arg.startswith('@'):
                expanded_args.append(arg)
            else:
                nonlocal expanded, visited
                expanded = True

                file_name = arg[1:]
                rel_path = os.path.normpath(os.path.join(parent_path, file_name))

                if rel_path in visited:
                    file_stack_str = ' -> '.join(['@' + f for f in file_stack + [file_name]])
                    raise FatalError(f'Circular dependency in file argument expansion: {file_stack_str}')
                visited.add(rel_path)

                try:
                    with open(rel_path, 'r') as f:
                        for line in f:
                            expanded_args.extend(expand_args(shlex.split(line), os.path.dirname(rel_path), file_stack + [file_name]))
                except IOError:
                    file_stack_str = ' -> '.join(['@' + f for f in file_stack + [file_name]])
                    raise FatalError(f"File '{rel_path}' (expansion of {file_stack_str}) could not be opened. "
                                     'Please ensure the file exists and you have the necessary permissions to read it.')
        return expanded_args

    argv = expand_args(argv, os.getcwd(), [])

    if expanded:
        print(f'Running: idf.py {" ".join(argv)}')

    return argv


def _valid_unicode_config() -> Union[codecs.CodecInfo, bool]:
    # Python 2 is always good
    if sys.version_info[0] == 2:
        return True

    # With python 3 unicode environment is required
    try:
        return codecs.lookup(locale.getpreferredencoding()).name != 'ascii'
    except Exception:
        return False


def _find_usable_locale() -> str:
    try:
        locales = subprocess.Popen(['locale', '-a'], stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()[0].decode('ascii', 'replace')
    except OSError:
        locales = ''

    usable_locales: List[str] = []
    for line in locales.splitlines():
        locale = line.strip()
        locale_name = locale.lower().replace('-', '')

        # C.UTF-8 is the best option, if supported
        if locale_name == 'c.utf8':
            return locale

        if locale_name.endswith('.utf8'):
            # Make a preference of english locales
            if locale.startswith('en_'):
                usable_locales.insert(0, locale)
            else:
                usable_locales.append(locale)

    if not usable_locales:
        raise FatalError(
            'Support for Unicode filenames is required, but no suitable UTF-8 locale was found on your system.'
            ' Please refer to the manual for your operating system for details on locale reconfiguration.')

    return usable_locales[0]


if __name__ == '__main__':
    try:
        if 'MSYSTEM' in os.environ:
            print_warning(
                'MSys/Mingw is no longer supported. Please follow the getting started guide of the '
                'documentation in order to set up a suitiable environment, or continue at your own risk.')
        elif os.name == 'posix' and not _valid_unicode_config():
            # Trying to find best utf-8 locale available on the system and restart python with it
            best_locale = _find_usable_locale()

            print_warning(
                'Your environment is not configured to handle unicode filenames outside of ASCII range.'
                ' Environment variable LC_ALL is temporary set to %s for unicode support.' % best_locale)

            os.environ['LC_ALL'] = best_locale
            ret = subprocess.call([sys.executable] + sys.argv, env=os.environ)
            if ret:
                raise SystemExit(ret)

        else:
            main()

    except FatalError as e:
        print(e, file=sys.stderr)
        sys.exit(2)