forked from s434650/CatOrNot
375 lines
13 KiB
Python
375 lines
13 KiB
Python
import os
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import sys
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import shutil
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import tempfile
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import contextlib
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import shlex
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from ._compat import iteritems, PY2, string_types
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# If someone wants to vendor click, we want to ensure the
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# correct package is discovered. Ideally we could use a
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# relative import here but unfortunately Python does not
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# support that.
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clickpkg = sys.modules[__name__.rsplit('.', 1)[0]]
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if PY2:
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from cStringIO import StringIO
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else:
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import io
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from ._compat import _find_binary_reader
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class EchoingStdin(object):
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def __init__(self, input, output):
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self._input = input
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self._output = output
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def __getattr__(self, x):
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return getattr(self._input, x)
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def _echo(self, rv):
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self._output.write(rv)
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return rv
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def read(self, n=-1):
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return self._echo(self._input.read(n))
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def readline(self, n=-1):
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return self._echo(self._input.readline(n))
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def readlines(self):
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return [self._echo(x) for x in self._input.readlines()]
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def __iter__(self):
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return iter(self._echo(x) for x in self._input)
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def __repr__(self):
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return repr(self._input)
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def make_input_stream(input, charset):
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# Is already an input stream.
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if hasattr(input, 'read'):
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if PY2:
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return input
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rv = _find_binary_reader(input)
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if rv is not None:
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return rv
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raise TypeError('Could not find binary reader for input stream.')
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if input is None:
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input = b''
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elif not isinstance(input, bytes):
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input = input.encode(charset)
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if PY2:
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return StringIO(input)
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return io.BytesIO(input)
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class Result(object):
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"""Holds the captured result of an invoked CLI script."""
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def __init__(self, runner, stdout_bytes, stderr_bytes, exit_code,
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exception, exc_info=None):
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#: The runner that created the result
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self.runner = runner
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#: The standard output as bytes.
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self.stdout_bytes = stdout_bytes
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#: The standard error as bytes, or False(y) if not available
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self.stderr_bytes = stderr_bytes
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#: The exit code as integer.
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self.exit_code = exit_code
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#: The exception that happened if one did.
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self.exception = exception
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#: The traceback
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self.exc_info = exc_info
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@property
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def output(self):
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"""The (standard) output as unicode string."""
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return self.stdout
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@property
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def stdout(self):
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"""The standard output as unicode string."""
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return self.stdout_bytes.decode(self.runner.charset, 'replace') \
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.replace('\r\n', '\n')
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@property
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def stderr(self):
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"""The standard error as unicode string."""
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if not self.stderr_bytes:
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raise ValueError("stderr not separately captured")
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return self.stderr_bytes.decode(self.runner.charset, 'replace') \
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.replace('\r\n', '\n')
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def __repr__(self):
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return '<%s %s>' % (
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type(self).__name__,
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self.exception and repr(self.exception) or 'okay',
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)
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class CliRunner(object):
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"""The CLI runner provides functionality to invoke a Click command line
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script for unittesting purposes in a isolated environment. This only
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works in single-threaded systems without any concurrency as it changes the
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global interpreter state.
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:param charset: the character set for the input and output data. This is
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UTF-8 by default and should not be changed currently as
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the reporting to Click only works in Python 2 properly.
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:param env: a dictionary with environment variables for overriding.
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:param echo_stdin: if this is set to `True`, then reading from stdin writes
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to stdout. This is useful for showing examples in
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some circumstances. Note that regular prompts
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will automatically echo the input.
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:param mix_stderr: if this is set to `False`, then stdout and stderr are
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preserved as independent streams. This is useful for
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Unix-philosophy apps that have predictable stdout and
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noisy stderr, such that each may be measured
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independently
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"""
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def __init__(self, charset=None, env=None, echo_stdin=False,
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mix_stderr=True):
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if charset is None:
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charset = 'utf-8'
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self.charset = charset
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self.env = env or {}
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self.echo_stdin = echo_stdin
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self.mix_stderr = mix_stderr
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def get_default_prog_name(self, cli):
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"""Given a command object it will return the default program name
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for it. The default is the `name` attribute or ``"root"`` if not
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set.
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"""
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return cli.name or 'root'
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def make_env(self, overrides=None):
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"""Returns the environment overrides for invoking a script."""
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rv = dict(self.env)
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if overrides:
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rv.update(overrides)
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return rv
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@contextlib.contextmanager
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def isolation(self, input=None, env=None, color=False):
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"""A context manager that sets up the isolation for invoking of a
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command line tool. This sets up stdin with the given input data
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and `os.environ` with the overrides from the given dictionary.
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This also rebinds some internals in Click to be mocked (like the
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prompt functionality).
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This is automatically done in the :meth:`invoke` method.
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.. versionadded:: 4.0
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The ``color`` parameter was added.
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:param input: the input stream to put into sys.stdin.
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:param env: the environment overrides as dictionary.
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:param color: whether the output should contain color codes. The
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application can still override this explicitly.
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"""
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input = make_input_stream(input, self.charset)
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old_stdin = sys.stdin
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old_stdout = sys.stdout
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old_stderr = sys.stderr
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old_forced_width = clickpkg.formatting.FORCED_WIDTH
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clickpkg.formatting.FORCED_WIDTH = 80
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env = self.make_env(env)
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if PY2:
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bytes_output = StringIO()
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if self.echo_stdin:
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input = EchoingStdin(input, bytes_output)
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sys.stdout = bytes_output
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if not self.mix_stderr:
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bytes_error = StringIO()
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sys.stderr = bytes_error
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else:
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bytes_output = io.BytesIO()
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if self.echo_stdin:
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input = EchoingStdin(input, bytes_output)
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input = io.TextIOWrapper(input, encoding=self.charset)
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sys.stdout = io.TextIOWrapper(
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bytes_output, encoding=self.charset)
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if not self.mix_stderr:
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bytes_error = io.BytesIO()
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sys.stderr = io.TextIOWrapper(
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bytes_error, encoding=self.charset)
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if self.mix_stderr:
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sys.stderr = sys.stdout
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sys.stdin = input
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def visible_input(prompt=None):
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sys.stdout.write(prompt or '')
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val = input.readline().rstrip('\r\n')
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sys.stdout.write(val + '\n')
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sys.stdout.flush()
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return val
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def hidden_input(prompt=None):
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sys.stdout.write((prompt or '') + '\n')
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sys.stdout.flush()
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return input.readline().rstrip('\r\n')
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def _getchar(echo):
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char = sys.stdin.read(1)
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if echo:
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sys.stdout.write(char)
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sys.stdout.flush()
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return char
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default_color = color
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def should_strip_ansi(stream=None, color=None):
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if color is None:
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return not default_color
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return not color
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old_visible_prompt_func = clickpkg.termui.visible_prompt_func
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old_hidden_prompt_func = clickpkg.termui.hidden_prompt_func
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old__getchar_func = clickpkg.termui._getchar
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old_should_strip_ansi = clickpkg.utils.should_strip_ansi
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clickpkg.termui.visible_prompt_func = visible_input
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clickpkg.termui.hidden_prompt_func = hidden_input
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clickpkg.termui._getchar = _getchar
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clickpkg.utils.should_strip_ansi = should_strip_ansi
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old_env = {}
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try:
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for key, value in iteritems(env):
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old_env[key] = os.environ.get(key)
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if value is None:
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try:
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del os.environ[key]
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except Exception:
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pass
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else:
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os.environ[key] = value
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yield (bytes_output, not self.mix_stderr and bytes_error)
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finally:
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for key, value in iteritems(old_env):
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if value is None:
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try:
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del os.environ[key]
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except Exception:
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pass
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else:
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os.environ[key] = value
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sys.stdout = old_stdout
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sys.stderr = old_stderr
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sys.stdin = old_stdin
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clickpkg.termui.visible_prompt_func = old_visible_prompt_func
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clickpkg.termui.hidden_prompt_func = old_hidden_prompt_func
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clickpkg.termui._getchar = old__getchar_func
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clickpkg.utils.should_strip_ansi = old_should_strip_ansi
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clickpkg.formatting.FORCED_WIDTH = old_forced_width
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def invoke(self, cli, args=None, input=None, env=None,
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catch_exceptions=True, color=False, mix_stderr=False, **extra):
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"""Invokes a command in an isolated environment. The arguments are
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forwarded directly to the command line script, the `extra` keyword
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arguments are passed to the :meth:`~clickpkg.Command.main` function of
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the command.
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This returns a :class:`Result` object.
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.. versionadded:: 3.0
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The ``catch_exceptions`` parameter was added.
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.. versionchanged:: 3.0
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The result object now has an `exc_info` attribute with the
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traceback if available.
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.. versionadded:: 4.0
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The ``color`` parameter was added.
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:param cli: the command to invoke
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:param args: the arguments to invoke. It may be given as an iterable
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or a string. When given as string it will be interpreted
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as a Unix shell command. More details at
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:func:`shlex.split`.
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:param input: the input data for `sys.stdin`.
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:param env: the environment overrides.
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:param catch_exceptions: Whether to catch any other exceptions than
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``SystemExit``.
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:param extra: the keyword arguments to pass to :meth:`main`.
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:param color: whether the output should contain color codes. The
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application can still override this explicitly.
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"""
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exc_info = None
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with self.isolation(input=input, env=env, color=color) as outstreams:
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exception = None
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exit_code = 0
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if isinstance(args, string_types):
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args = shlex.split(args)
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try:
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prog_name = extra.pop("prog_name")
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except KeyError:
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prog_name = self.get_default_prog_name(cli)
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try:
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cli.main(args=args or (), prog_name=prog_name, **extra)
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except SystemExit as e:
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exc_info = sys.exc_info()
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exit_code = e.code
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if exit_code is None:
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exit_code = 0
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if exit_code != 0:
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exception = e
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if not isinstance(exit_code, int):
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sys.stdout.write(str(exit_code))
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sys.stdout.write('\n')
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exit_code = 1
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except Exception as e:
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if not catch_exceptions:
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raise
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exception = e
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exit_code = 1
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exc_info = sys.exc_info()
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finally:
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sys.stdout.flush()
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stdout = outstreams[0].getvalue()
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stderr = outstreams[1] and outstreams[1].getvalue()
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return Result(runner=self,
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stdout_bytes=stdout,
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stderr_bytes=stderr,
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exit_code=exit_code,
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exception=exception,
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exc_info=exc_info)
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@contextlib.contextmanager
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def isolated_filesystem(self):
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"""A context manager that creates a temporary folder and changes
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the current working directory to it for isolated filesystem tests.
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"""
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cwd = os.getcwd()
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t = tempfile.mkdtemp()
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os.chdir(t)
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try:
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yield t
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finally:
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os.chdir(cwd)
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try:
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shutil.rmtree(t)
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except (OSError, IOError):
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pass
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