Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/click/testing.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 import os
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2 import sys
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3 import shutil
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4 import tempfile
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5 import contextlib
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6
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7 from ._compat import iteritems, PY2
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8
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9
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10 # If someone wants to vendor click, we want to ensure the
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11 # correct package is discovered. Ideally we could use a
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12 # relative import here but unfortunately Python does not
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13 # support that.
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14 clickpkg = sys.modules[__name__.rsplit('.', 1)[0]]
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16
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17 if PY2:
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18 from cStringIO import StringIO
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19 else:
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20 import io
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21 from ._compat import _find_binary_reader
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22
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23
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24 class EchoingStdin(object):
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25
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26 def __init__(self, input, output):
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27 self._input = input
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28 self._output = output
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29
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30 def __getattr__(self, x):
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31 return getattr(self._input, x)
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32
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33 def _echo(self, rv):
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34 self._output.write(rv)
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35 return rv
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36
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37 def read(self, n=-1):
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38 return self._echo(self._input.read(n))
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39
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40 def readline(self, n=-1):
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41 return self._echo(self._input.readline(n))
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42
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43 def readlines(self):
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44 return [self._echo(x) for x in self._input.readlines()]
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45
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46 def __iter__(self):
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47 return iter(self._echo(x) for x in self._input)
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48
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49 def __repr__(self):
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50 return repr(self._input)
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51
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52
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53 def make_input_stream(input, charset):
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54 # Is already an input stream.
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55 if hasattr(input, 'read'):
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56 if PY2:
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57 return input
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58 rv = _find_binary_reader(input)
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59 if rv is not None:
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60 return rv
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61 raise TypeError('Could not find binary reader for input stream.')
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62
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63 if input is None:
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64 input = b''
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65 elif not isinstance(input, bytes):
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66 input = input.encode(charset)
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67 if PY2:
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68 return StringIO(input)
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69 return io.BytesIO(input)
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70
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71
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72 class Result(object):
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73 """Holds the captured result of an invoked CLI script."""
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74
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75 def __init__(self, runner, output_bytes, exit_code, exception,
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76 exc_info=None):
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77 #: The runner that created the result
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78 self.runner = runner
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79 #: The output as bytes.
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80 self.output_bytes = output_bytes
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81 #: The exit code as integer.
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82 self.exit_code = exit_code
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83 #: The exception that happend if one did.
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84 self.exception = exception
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85 #: The traceback
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86 self.exc_info = exc_info
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87
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88 @property
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89 def output(self):
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90 """The output as unicode string."""
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91 return self.output_bytes.decode(self.runner.charset, 'replace') \
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92 .replace('\r\n', '\n')
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93
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94 def __repr__(self):
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95 return '<Result %s>' % (
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96 self.exception and repr(self.exception) or 'okay',
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97 )
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98
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99
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100 class CliRunner(object):
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101 """The CLI runner provides functionality to invoke a Click command line
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102 script for unittesting purposes in a isolated environment. This only
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103 works in single-threaded systems without any concurrency as it changes the
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104 global interpreter state.
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105
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106 :param charset: the character set for the input and output data. This is
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107 UTF-8 by default and should not be changed currently as
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108 the reporting to Click only works in Python 2 properly.
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109 :param env: a dictionary with environment variables for overriding.
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110 :param echo_stdin: if this is set to `True`, then reading from stdin writes
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111 to stdout. This is useful for showing examples in
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112 some circumstances. Note that regular prompts
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113 will automatically echo the input.
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114 """
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115
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116 def __init__(self, charset=None, env=None, echo_stdin=False):
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117 if charset is None:
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118 charset = 'utf-8'
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119 self.charset = charset
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120 self.env = env or {}
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121 self.echo_stdin = echo_stdin
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122
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123 def get_default_prog_name(self, cli):
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124 """Given a command object it will return the default program name
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125 for it. The default is the `name` attribute or ``"root"`` if not
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126 set.
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127 """
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128 return cli.name or 'root'
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129
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130 def make_env(self, overrides=None):
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131 """Returns the environment overrides for invoking a script."""
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132 rv = dict(self.env)
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133 if overrides:
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134 rv.update(overrides)
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135 return rv
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136
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137 @contextlib.contextmanager
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138 def isolation(self, input=None, env=None, color=False):
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139 """A context manager that sets up the isolation for invoking of a
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140 command line tool. This sets up stdin with the given input data
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141 and `os.environ` with the overrides from the given dictionary.
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142 This also rebinds some internals in Click to be mocked (like the
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143 prompt functionality).
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144
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145 This is automatically done in the :meth:`invoke` method.
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146
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147 .. versionadded:: 4.0
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148 The ``color`` parameter was added.
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149
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150 :param input: the input stream to put into sys.stdin.
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151 :param env: the environment overrides as dictionary.
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152 :param color: whether the output should contain color codes. The
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153 application can still override this explicitly.
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154 """
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155 input = make_input_stream(input, self.charset)
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156
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157 old_stdin = sys.stdin
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158 old_stdout = sys.stdout
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159 old_stderr = sys.stderr
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160
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161 env = self.make_env(env)
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162
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163 if PY2:
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164 sys.stdout = sys.stderr = bytes_output = StringIO()
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165 if self.echo_stdin:
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166 input = EchoingStdin(input, bytes_output)
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167 else:
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168 bytes_output = io.BytesIO()
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169 if self.echo_stdin:
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170 input = EchoingStdin(input, bytes_output)
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171 input = io.TextIOWrapper(input, encoding=self.charset)
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172 sys.stdout = sys.stderr = io.TextIOWrapper(
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173 bytes_output, encoding=self.charset)
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174
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175 sys.stdin = input
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176
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177 def visible_input(prompt=None):
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178 sys.stdout.write(prompt or '')
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179 val = input.readline().rstrip('\r\n')
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180 sys.stdout.write(val + '\n')
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181 sys.stdout.flush()
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182 return val
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183
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184 def hidden_input(prompt=None):
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185 sys.stdout.write((prompt or '') + '\n')
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186 sys.stdout.flush()
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187 return input.readline().rstrip('\r\n')
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188
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189 def _getchar(echo):
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190 char = sys.stdin.read(1)
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191 if echo:
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192 sys.stdout.write(char)
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193 sys.stdout.flush()
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194 return char
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195
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196 default_color = color
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197 def should_strip_ansi(stream=None, color=None):
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198 if color is None:
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199 return not default_color
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200 return not color
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201
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202 old_visible_prompt_func = clickpkg.termui.visible_prompt_func
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203 old_hidden_prompt_func = clickpkg.termui.hidden_prompt_func
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204 old__getchar_func = clickpkg.termui._getchar
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205 old_should_strip_ansi = clickpkg.utils.should_strip_ansi
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206 clickpkg.termui.visible_prompt_func = visible_input
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207 clickpkg.termui.hidden_prompt_func = hidden_input
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208 clickpkg.termui._getchar = _getchar
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209 clickpkg.utils.should_strip_ansi = should_strip_ansi
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210
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211 old_env = {}
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212 try:
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213 for key, value in iteritems(env):
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214 old_env[key] = os.environ.get(value)
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215 if value is None:
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216 try:
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217 del os.environ[key]
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218 except Exception:
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219 pass
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220 else:
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221 os.environ[key] = value
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222 yield bytes_output
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223 finally:
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224 for key, value in iteritems(old_env):
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225 if value is None:
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226 try:
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227 del os.environ[key]
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228 except Exception:
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229 pass
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230 else:
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231 os.environ[key] = value
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232 sys.stdout = old_stdout
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233 sys.stderr = old_stderr
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234 sys.stdin = old_stdin
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235 clickpkg.termui.visible_prompt_func = old_visible_prompt_func
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236 clickpkg.termui.hidden_prompt_func = old_hidden_prompt_func
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237 clickpkg.termui._getchar = old__getchar_func
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238 clickpkg.utils.should_strip_ansi = old_should_strip_ansi
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239
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240 def invoke(self, cli, args=None, input=None, env=None,
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241 catch_exceptions=True, color=False, **extra):
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242 """Invokes a command in an isolated environment. The arguments are
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243 forwarded directly to the command line script, the `extra` keyword
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244 arguments are passed to the :meth:`~clickpkg.Command.main` function of
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245 the command.
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246
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247 This returns a :class:`Result` object.
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248
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249 .. versionadded:: 3.0
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250 The ``catch_exceptions`` parameter was added.
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251
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252 .. versionchanged:: 3.0
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253 The result object now has an `exc_info` attribute with the
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254 traceback if available.
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255
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256 .. versionadded:: 4.0
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257 The ``color`` parameter was added.
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258
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259 :param cli: the command to invoke
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260 :param args: the arguments to invoke
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261 :param input: the input data for `sys.stdin`.
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262 :param env: the environment overrides.
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263 :param catch_exceptions: Whether to catch any other exceptions than
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264 ``SystemExit``.
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265 :param extra: the keyword arguments to pass to :meth:`main`.
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266 :param color: whether the output should contain color codes. The
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267 application can still override this explicitly.
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268 """
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269 exc_info = None
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270 with self.isolation(input=input, env=env, color=color) as out:
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271 exception = None
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272 exit_code = 0
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273
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274 try:
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275 cli.main(args=args or (),
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276 prog_name=self.get_default_prog_name(cli), **extra)
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277 except SystemExit as e:
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278 if e.code != 0:
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279 exception = e
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280
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281 exc_info = sys.exc_info()
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282
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283 exit_code = e.code
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284 if not isinstance(exit_code, int):
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285 sys.stdout.write(str(exit_code))
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286 sys.stdout.write('\n')
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287 exit_code = 1
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288 except Exception as e:
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289 if not catch_exceptions:
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290 raise
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291 exception = e
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292 exit_code = -1
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293 exc_info = sys.exc_info()
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294 finally:
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295 sys.stdout.flush()
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296 output = out.getvalue()
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297
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298 return Result(runner=self,
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299 output_bytes=output,
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300 exit_code=exit_code,
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301 exception=exception,
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302 exc_info=exc_info)
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303
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304 @contextlib.contextmanager
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305 def isolated_filesystem(self):
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306 """A context manager that creates a temporary folder and changes
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307 the current working directory to it for isolated filesystem tests.
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308 """
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309 cwd = os.getcwd()
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310 t = tempfile.mkdtemp()
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311 os.chdir(t)
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312 try:
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313 yield t
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314 finally:
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315 os.chdir(cwd)
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316 try:
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317 shutil.rmtree(t)
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318 except (OSError, IOError):
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319 pass