Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/humanfriendly/prompts.py @ 2:6af9afd405e9 draft

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"planemo upload commit 0a63dd5f4d38a1f6944587f52a8cd79874177fc1"
author shellac
date Thu, 14 May 2020 14:56:58 -0400
parents 26e78fe6e8c4
children
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1 # vim: fileencoding=utf-8
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2
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3 # Human friendly input/output in Python.
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4 #
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5 # Author: Peter Odding <peter@peterodding.com>
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6 # Last Change: February 9, 2020
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7 # URL: https://humanfriendly.readthedocs.io
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8
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9 """
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10 Interactive terminal prompts.
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11
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12 The :mod:`~humanfriendly.prompts` module enables interaction with the user
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13 (operator) by asking for confirmation (:func:`prompt_for_confirmation()`) and
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14 asking to choose from a list of options (:func:`prompt_for_choice()`). It works
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15 by rendering interactive prompts on the terminal.
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16 """
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17
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18 # Standard library modules.
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19 import logging
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20 import sys
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21
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22 # Modules included in our package.
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23 from humanfriendly.compat import interactive_prompt
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24 from humanfriendly.terminal import (
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25 HIGHLIGHT_COLOR,
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26 ansi_strip,
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27 ansi_wrap,
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28 connected_to_terminal,
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29 terminal_supports_colors,
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30 warning,
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31 )
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32 from humanfriendly.text import format, concatenate
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33
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34 # Public identifiers that require documentation.
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35 __all__ = (
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36 'MAX_ATTEMPTS',
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37 'TooManyInvalidReplies',
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38 'logger',
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39 'prepare_friendly_prompts',
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40 'prepare_prompt_text',
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41 'prompt_for_choice',
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42 'prompt_for_confirmation',
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43 'prompt_for_input',
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44 'retry_limit',
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45 )
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46
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47 MAX_ATTEMPTS = 10
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48 """The number of times an interactive prompt is shown on invalid input (an integer)."""
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49
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50 # Initialize a logger for this module.
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51 logger = logging.getLogger(__name__)
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52
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53
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54 def prompt_for_confirmation(question, default=None, padding=True):
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55 """
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56 Prompt the user for confirmation.
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57
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58 :param question: The text that explains what the user is confirming (a string).
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59 :param default: The default value (a boolean) or :data:`None`.
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60 :param padding: Refer to the documentation of :func:`prompt_for_input()`.
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61 :returns: - If the user enters 'yes' or 'y' then :data:`True` is returned.
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62 - If the user enters 'no' or 'n' then :data:`False` is returned.
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63 - If the user doesn't enter any text or standard input is not
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64 connected to a terminal (which makes it impossible to prompt
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65 the user) the value of the keyword argument ``default`` is
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66 returned (if that value is not :data:`None`).
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67 :raises: - Any exceptions raised by :func:`retry_limit()`.
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68 - Any exceptions raised by :func:`prompt_for_input()`.
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69
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70 When `default` is :data:`False` and the user doesn't enter any text an
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71 error message is printed and the prompt is repeated:
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72
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73 >>> prompt_for_confirmation("Are you sure?")
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74 <BLANKLINE>
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75 Are you sure? [y/n]
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76 <BLANKLINE>
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77 Error: Please enter 'yes' or 'no' (there's no default choice).
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78 <BLANKLINE>
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79 Are you sure? [y/n]
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80
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81 The same thing happens when the user enters text that isn't recognized:
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82
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83 >>> prompt_for_confirmation("Are you sure?")
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84 <BLANKLINE>
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85 Are you sure? [y/n] about what?
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86 <BLANKLINE>
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87 Error: Please enter 'yes' or 'no' (the text 'about what?' is not recognized).
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88 <BLANKLINE>
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89 Are you sure? [y/n]
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90 """
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91 # Generate the text for the prompt.
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92 prompt_text = prepare_prompt_text(question, bold=True)
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93 # Append the valid replies (and default reply) to the prompt text.
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94 hint = "[Y/n]" if default else "[y/N]" if default is not None else "[y/n]"
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95 prompt_text += " %s " % prepare_prompt_text(hint, color=HIGHLIGHT_COLOR)
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96 # Loop until a valid response is given.
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97 logger.debug("Requesting interactive confirmation from terminal: %r", ansi_strip(prompt_text).rstrip())
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98 for attempt in retry_limit():
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99 reply = prompt_for_input(prompt_text, '', padding=padding, strip=True)
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100 if reply.lower() in ('y', 'yes'):
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101 logger.debug("Confirmation granted by reply (%r).", reply)
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102 return True
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103 elif reply.lower() in ('n', 'no'):
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104 logger.debug("Confirmation denied by reply (%r).", reply)
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105 return False
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106 elif (not reply) and default is not None:
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107 logger.debug("Default choice selected by empty reply (%r).",
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108 "granted" if default else "denied")
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109 return default
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110 else:
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111 details = ("the text '%s' is not recognized" % reply
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112 if reply else "there's no default choice")
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113 logger.debug("Got %s reply (%s), retrying (%i/%i) ..",
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114 "invalid" if reply else "empty", details,
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115 attempt, MAX_ATTEMPTS)
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116 warning("{indent}Error: Please enter 'yes' or 'no' ({details}).",
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117 indent=' ' if padding else '', details=details)
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118
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119
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120 def prompt_for_choice(choices, default=None, padding=True):
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121 """
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122 Prompt the user to select a choice from a group of options.
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123
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124 :param choices: A sequence of strings with available options.
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125 :param default: The default choice if the user simply presses Enter
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126 (expected to be a string, defaults to :data:`None`).
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127 :param padding: Refer to the documentation of
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128 :func:`~humanfriendly.prompts.prompt_for_input()`.
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129 :returns: The string corresponding to the user's choice.
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130 :raises: - :exc:`~exceptions.ValueError` if `choices` is an empty sequence.
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131 - Any exceptions raised by
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132 :func:`~humanfriendly.prompts.retry_limit()`.
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133 - Any exceptions raised by
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134 :func:`~humanfriendly.prompts.prompt_for_input()`.
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135
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136 When no options are given an exception is raised:
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137
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138 >>> prompt_for_choice([])
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139 Traceback (most recent call last):
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140 File "humanfriendly/prompts.py", line 148, in prompt_for_choice
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141 raise ValueError("Can't prompt for choice without any options!")
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142 ValueError: Can't prompt for choice without any options!
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143
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144 If a single option is given the user isn't prompted:
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145
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146 >>> prompt_for_choice(['only one choice'])
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147 'only one choice'
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148
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149 Here's what the actual prompt looks like by default:
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150
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151 >>> prompt_for_choice(['first option', 'second option'])
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152 <BLANKLINE>
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153 1. first option
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154 2. second option
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155 <BLANKLINE>
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156 Enter your choice as a number or unique substring (Control-C aborts): second
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157 <BLANKLINE>
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158 'second option'
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159
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160 If you don't like the whitespace (empty lines and indentation):
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161
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162 >>> prompt_for_choice(['first option', 'second option'], padding=False)
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163 1. first option
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164 2. second option
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165 Enter your choice as a number or unique substring (Control-C aborts): first
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166 'first option'
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167 """
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168 indent = ' ' if padding else ''
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169 # Make sure we can use 'choices' more than once (i.e. not a generator).
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170 choices = list(choices)
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171 if len(choices) == 1:
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172 # If there's only one option there's no point in prompting the user.
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173 logger.debug("Skipping interactive prompt because there's only option (%r).", choices[0])
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174 return choices[0]
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175 elif not choices:
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176 # We can't render a choice prompt without any options.
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177 raise ValueError("Can't prompt for choice without any options!")
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178 # Generate the prompt text.
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179 prompt_text = ('\n\n' if padding else '\n').join([
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180 # Present the available choices in a user friendly way.
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181 "\n".join([
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182 (u" %i. %s" % (i, choice)) + (" (default choice)" if choice == default else "")
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183 for i, choice in enumerate(choices, start=1)
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184 ]),
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185 # Instructions for the user.
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186 "Enter your choice as a number or unique substring (Control-C aborts): ",
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187 ])
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188 prompt_text = prepare_prompt_text(prompt_text, bold=True)
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189 # Loop until a valid choice is made.
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190 logger.debug("Requesting interactive choice on terminal (options are %s) ..",
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191 concatenate(map(repr, choices)))
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192 for attempt in retry_limit():
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193 reply = prompt_for_input(prompt_text, '', padding=padding, strip=True)
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194 if not reply and default is not None:
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195 logger.debug("Default choice selected by empty reply (%r).", default)
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196 return default
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197 elif reply.isdigit():
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198 index = int(reply) - 1
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199 if 0 <= index < len(choices):
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200 logger.debug("Option (%r) selected by numeric reply (%s).", choices[index], reply)
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201 return choices[index]
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202 # Check for substring matches.
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203 matches = []
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204 for choice in choices:
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205 lower_reply = reply.lower()
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206 lower_choice = choice.lower()
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207 if lower_reply == lower_choice:
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208 # If we have an 'exact' match we return it immediately.
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209 logger.debug("Option (%r) selected by reply (exact match).", choice)
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210 return choice
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211 elif lower_reply in lower_choice and len(lower_reply) > 0:
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212 # Otherwise we gather substring matches.
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213 matches.append(choice)
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214 if len(matches) == 1:
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215 # If a single choice was matched we return it.
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216 logger.debug("Option (%r) selected by reply (substring match on %r).", matches[0], reply)
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217 return matches[0]
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218 else:
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219 # Give the user a hint about what went wrong.
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220 if matches:
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221 details = format("text '%s' matches more than one choice: %s", reply, concatenate(matches))
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222 elif reply.isdigit():
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223 details = format("number %i is not a valid choice", int(reply))
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224 elif reply and not reply.isspace():
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225 details = format("text '%s' doesn't match any choices", reply)
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226 else:
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227 details = "there's no default choice"
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228 logger.debug("Got %s reply (%s), retrying (%i/%i) ..",
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229 "invalid" if reply else "empty", details,
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230 attempt, MAX_ATTEMPTS)
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231 warning("%sError: Invalid input (%s).", indent, details)
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232
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233
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234 def prompt_for_input(question, default=None, padding=True, strip=True):
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235 """
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236 Prompt the user for input (free form text).
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237
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238 :param question: An explanation of what is expected from the user (a string).
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239 :param default: The return value if the user doesn't enter any text or
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240 standard input is not connected to a terminal (which
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241 makes it impossible to prompt the user).
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242 :param padding: Render empty lines before and after the prompt to make it
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243 stand out from the surrounding text? (a boolean, defaults
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244 to :data:`True`)
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245 :param strip: Strip leading/trailing whitespace from the user's reply?
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246 :returns: The text entered by the user (a string) or the value of the
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247 `default` argument.
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248 :raises: - :exc:`~exceptions.KeyboardInterrupt` when the program is
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249 interrupted_ while the prompt is active, for example
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250 because the user presses Control-C_.
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251 - :exc:`~exceptions.EOFError` when reading from `standard input`_
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252 fails, for example because the user presses Control-D_ or
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253 because the standard input stream is redirected (only if
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254 `default` is :data:`None`).
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255
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256 .. _Control-C: https://en.wikipedia.org/wiki/Control-C#In_command-line_environments
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257 .. _Control-D: https://en.wikipedia.org/wiki/End-of-transmission_character#Meaning_in_Unix
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258 .. _interrupted: https://en.wikipedia.org/wiki/Unix_signal#SIGINT
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259 .. _standard input: https://en.wikipedia.org/wiki/Standard_streams#Standard_input_.28stdin.29
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260 """
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261 prepare_friendly_prompts()
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262 reply = None
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263 try:
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264 # Prefix an empty line to the text and indent by one space?
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265 if padding:
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266 question = '\n' + question
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267 question = question.replace('\n', '\n ')
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268 # Render the prompt and wait for the user's reply.
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269 try:
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270 reply = interactive_prompt(question)
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271 finally:
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272 if reply is None:
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273 # If the user terminated the prompt using Control-C or
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274 # Control-D instead of pressing Enter no newline will be
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275 # rendered after the prompt's text. The result looks kind of
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276 # weird:
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277 #
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278 # $ python -c 'print(raw_input("Are you sure? "))'
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279 # Are you sure? ^CTraceback (most recent call last):
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280 # File "<string>", line 1, in <module>
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281 # KeyboardInterrupt
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282 #
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283 # We can avoid this by emitting a newline ourselves if an
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284 # exception was raised (signaled by `reply' being None).
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285 sys.stderr.write('\n')
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286 if padding:
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287 # If the caller requested (didn't opt out of) `padding' then we'll
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288 # emit a newline regardless of whether an exception is being
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289 # handled. This helps to make interactive prompts `stand out' from
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290 # a surrounding `wall of text' on the terminal.
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291 sys.stderr.write('\n')
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292 except BaseException as e:
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293 if isinstance(e, EOFError) and default is not None:
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294 # If standard input isn't connected to an interactive terminal
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295 # but the caller provided a default we'll return that.
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296 logger.debug("Got EOF from terminal, returning default value (%r) ..", default)
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297 return default
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298 else:
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299 # Otherwise we log that the prompt was interrupted but propagate
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300 # the exception to the caller.
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301 logger.warning("Interactive prompt was interrupted by exception!", exc_info=True)
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302 raise
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303 if default is not None and not reply:
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304 # If the reply is empty and `default' is None we don't want to return
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305 # None because it's nicer for callers to be able to assume that the
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306 # return value is always a string.
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307 return default
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308 else:
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309 return reply.strip()
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310
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311
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312 def prepare_prompt_text(prompt_text, **options):
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313 """
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314 Wrap a text to be rendered as an interactive prompt in ANSI escape sequences.
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315
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316 :param prompt_text: The text to render on the prompt (a string).
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317 :param options: Any keyword arguments are passed on to :func:`.ansi_wrap()`.
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318 :returns: The resulting prompt text (a string).
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319
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320 ANSI escape sequences are only used when the standard output stream is
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321 connected to a terminal. When the standard input stream is connected to a
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322 terminal any escape sequences are wrapped in "readline hints".
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323 """
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324 return (ansi_wrap(prompt_text, readline_hints=connected_to_terminal(sys.stdin), **options)
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325 if terminal_supports_colors(sys.stdout)
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326 else prompt_text)
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327
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328
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329 def prepare_friendly_prompts():
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330 u"""
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331 Make interactive prompts more user friendly.
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332
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333 The prompts presented by :func:`python2:raw_input()` (in Python 2) and
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334 :func:`python3:input()` (in Python 3) are not very user friendly by
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335 default, for example the cursor keys (:kbd:`←`, :kbd:`↑`, :kbd:`→` and
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336 :kbd:`↓`) and the :kbd:`Home` and :kbd:`End` keys enter characters instead
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337 of performing the action you would expect them to. By simply importing the
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338 :mod:`readline` module these prompts become much friendlier (as mentioned
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339 in the Python standard library documentation).
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340
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341 This function is called by the other functions in this module to enable
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342 user friendly prompts.
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343 """
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344 import readline # NOQA
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345
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346
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347 def retry_limit(limit=MAX_ATTEMPTS):
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348 """
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349 Allow the user to provide valid input up to `limit` times.
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350
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351 :param limit: The maximum number of attempts (a number,
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352 defaults to :data:`MAX_ATTEMPTS`).
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353 :returns: A generator of numbers starting from one.
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354 :raises: :exc:`TooManyInvalidReplies` when an interactive prompt
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355 receives repeated invalid input (:data:`MAX_ATTEMPTS`).
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356
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357 This function returns a generator for interactive prompts that want to
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358 repeat on invalid input without getting stuck in infinite loops.
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359 """
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360 for i in range(limit):
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361 yield i + 1
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362 msg = "Received too many invalid replies on interactive prompt, giving up! (tried %i times)"
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363 formatted_msg = msg % limit
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364 # Make sure the event is logged.
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365 logger.warning(formatted_msg)
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366 # Force the caller to decide what to do now.
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367 raise TooManyInvalidReplies(formatted_msg)
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368
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369
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370 class TooManyInvalidReplies(Exception):
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371
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372 """Raised by interactive prompts when they've received too many invalid inputs."""