Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/humanfriendly/terminal/__init__.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 # Human friendly input/output in Python. |
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2 # |
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3 # Author: Peter Odding <peter@peterodding.com> |
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4 # Last Change: March 1, 2020 |
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5 # URL: https://humanfriendly.readthedocs.io |
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6 |
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7 """ |
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8 Interaction with interactive text terminals. |
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9 |
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10 The :mod:`~humanfriendly.terminal` module makes it easy to interact with |
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11 interactive text terminals and format text for rendering on such terminals. If |
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12 the terms used in the documentation of this module don't make sense to you then |
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13 please refer to the `Wikipedia article on ANSI escape sequences`_ for details |
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14 about how ANSI escape sequences work. |
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15 |
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16 This module was originally developed for use on UNIX systems, but since then |
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17 Windows 10 gained native support for ANSI escape sequences and this module was |
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18 enhanced to recognize and support this. For details please refer to the |
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19 :func:`enable_ansi_support()` function. |
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20 |
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21 .. _Wikipedia article on ANSI escape sequences: http://en.wikipedia.org/wiki/ANSI_escape_code#Sequence_elements |
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22 """ |
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23 |
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24 # Standard library modules. |
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25 import codecs |
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26 import numbers |
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27 import os |
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28 import platform |
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29 import re |
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30 import subprocess |
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31 import sys |
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32 |
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33 # The `fcntl' module is platform specific so importing it may give an error. We |
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34 # hide this implementation detail from callers by handling the import error and |
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35 # setting a flag instead. |
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36 try: |
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37 import fcntl |
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38 import termios |
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39 import struct |
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40 HAVE_IOCTL = True |
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41 except ImportError: |
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42 HAVE_IOCTL = False |
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43 |
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44 # Modules included in our package. |
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45 from humanfriendly.compat import coerce_string, is_unicode, on_windows, which |
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46 from humanfriendly.decorators import cached |
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47 from humanfriendly.deprecation import define_aliases |
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48 from humanfriendly.text import concatenate, format |
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49 from humanfriendly.usage import format_usage |
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50 |
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51 # Public identifiers that require documentation. |
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52 __all__ = ( |
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53 'ANSI_COLOR_CODES', |
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54 'ANSI_CSI', |
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55 'ANSI_ERASE_LINE', |
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56 'ANSI_HIDE_CURSOR', |
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57 'ANSI_RESET', |
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58 'ANSI_SGR', |
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59 'ANSI_SHOW_CURSOR', |
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60 'ANSI_TEXT_STYLES', |
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61 'CLEAN_OUTPUT_PATTERN', |
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62 'DEFAULT_COLUMNS', |
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63 'DEFAULT_ENCODING', |
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64 'DEFAULT_LINES', |
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65 'HIGHLIGHT_COLOR', |
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66 'ansi_strip', |
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67 'ansi_style', |
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68 'ansi_width', |
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69 'ansi_wrap', |
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70 'auto_encode', |
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71 'clean_terminal_output', |
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72 'connected_to_terminal', |
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73 'enable_ansi_support', |
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74 'find_terminal_size', |
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75 'find_terminal_size_using_ioctl', |
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76 'find_terminal_size_using_stty', |
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77 'get_pager_command', |
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78 'have_windows_native_ansi_support', |
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79 'message', |
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80 'output', |
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81 'readline_strip', |
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82 'readline_wrap', |
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83 'show_pager', |
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84 'terminal_supports_colors', |
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85 'usage', |
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86 'warning', |
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87 ) |
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88 |
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89 ANSI_CSI = '\x1b[' |
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90 """The ANSI "Control Sequence Introducer" (a string).""" |
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91 |
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92 ANSI_SGR = 'm' |
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93 """The ANSI "Select Graphic Rendition" sequence (a string).""" |
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94 |
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95 ANSI_ERASE_LINE = '%sK' % ANSI_CSI |
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96 """The ANSI escape sequence to erase the current line (a string).""" |
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97 |
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98 ANSI_RESET = '%s0%s' % (ANSI_CSI, ANSI_SGR) |
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99 """The ANSI escape sequence to reset styling (a string).""" |
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100 |
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101 ANSI_HIDE_CURSOR = '%s?25l' % ANSI_CSI |
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102 """The ANSI escape sequence to hide the text cursor (a string).""" |
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103 |
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104 ANSI_SHOW_CURSOR = '%s?25h' % ANSI_CSI |
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105 """The ANSI escape sequence to show the text cursor (a string).""" |
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106 |
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107 ANSI_COLOR_CODES = dict(black=0, red=1, green=2, yellow=3, blue=4, magenta=5, cyan=6, white=7) |
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108 """ |
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109 A dictionary with (name, number) pairs of `portable color codes`_. Used by |
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110 :func:`ansi_style()` to generate ANSI escape sequences that change font color. |
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111 |
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112 .. _portable color codes: http://en.wikipedia.org/wiki/ANSI_escape_code#Colors |
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113 """ |
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114 |
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115 ANSI_TEXT_STYLES = dict(bold=1, faint=2, italic=3, underline=4, inverse=7, strike_through=9) |
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116 """ |
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117 A dictionary with (name, number) pairs of text styles (effects). Used by |
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118 :func:`ansi_style()` to generate ANSI escape sequences that change text |
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119 styles. Only widely supported text styles are included here. |
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120 """ |
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121 |
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122 CLEAN_OUTPUT_PATTERN = re.compile(u'(\r|\n|\b|%s)' % re.escape(ANSI_ERASE_LINE)) |
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123 """ |
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124 A compiled regular expression used to separate significant characters from other text. |
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125 |
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126 This pattern is used by :func:`clean_terminal_output()` to split terminal |
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127 output into regular text versus backspace, carriage return and line feed |
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128 characters and ANSI 'erase line' escape sequences. |
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129 """ |
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130 |
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131 DEFAULT_LINES = 25 |
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132 """The default number of lines in a terminal (an integer).""" |
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133 |
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134 DEFAULT_COLUMNS = 80 |
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135 """The default number of columns in a terminal (an integer).""" |
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136 |
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137 DEFAULT_ENCODING = 'UTF-8' |
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138 """The output encoding for Unicode strings.""" |
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139 |
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140 HIGHLIGHT_COLOR = os.environ.get('HUMANFRIENDLY_HIGHLIGHT_COLOR', 'green') |
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141 """ |
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142 The color used to highlight important tokens in formatted text (e.g. the usage |
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143 message of the ``humanfriendly`` program). If the environment variable |
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144 ``$HUMANFRIENDLY_HIGHLIGHT_COLOR`` is set it determines the value of |
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145 :data:`HIGHLIGHT_COLOR`. |
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146 """ |
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147 |
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148 |
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149 def ansi_strip(text, readline_hints=True): |
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150 """ |
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151 Strip ANSI escape sequences from the given string. |
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152 |
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153 :param text: The text from which ANSI escape sequences should be removed (a |
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154 string). |
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155 :param readline_hints: If :data:`True` then :func:`readline_strip()` is |
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156 used to remove `readline hints`_ from the string. |
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157 :returns: The text without ANSI escape sequences (a string). |
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158 """ |
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159 pattern = '%s.*?%s' % (re.escape(ANSI_CSI), re.escape(ANSI_SGR)) |
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160 text = re.sub(pattern, '', text) |
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161 if readline_hints: |
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162 text = readline_strip(text) |
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163 return text |
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164 |
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165 |
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166 def ansi_style(**kw): |
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167 """ |
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168 Generate ANSI escape sequences for the given color and/or style(s). |
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169 |
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170 :param color: The foreground color. Three types of values are supported: |
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171 |
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172 - The name of a color (one of the strings 'black', 'red', |
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173 'green', 'yellow', 'blue', 'magenta', 'cyan' or 'white'). |
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174 - An integer that refers to the 256 color mode palette. |
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175 - A tuple or list with three integers representing an RGB |
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176 (red, green, blue) value. |
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177 |
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178 The value :data:`None` (the default) means no escape |
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179 sequence to switch color will be emitted. |
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180 :param background: The background color (see the description |
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181 of the `color` argument). |
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182 :param bright: Use high intensity colors instead of default colors |
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183 (a boolean, defaults to :data:`False`). |
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184 :param readline_hints: If :data:`True` then :func:`readline_wrap()` is |
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185 applied to the generated ANSI escape sequences (the |
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186 default is :data:`False`). |
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187 :param kw: Any additional keyword arguments are expected to match a key |
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188 in the :data:`ANSI_TEXT_STYLES` dictionary. If the argument's |
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189 value evaluates to :data:`True` the respective style will be |
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190 enabled. |
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191 :returns: The ANSI escape sequences to enable the requested text styles or |
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192 an empty string if no styles were requested. |
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193 :raises: :exc:`~exceptions.ValueError` when an invalid color name is given. |
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194 |
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195 Even though only eight named colors are supported, the use of `bright=True` |
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196 and `faint=True` increases the number of available colors to around 24 (it |
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197 may be slightly lower, for example because faint black is just black). |
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198 |
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199 **Support for 8-bit colors** |
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200 |
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201 In `release 4.7`_ support for 256 color mode was added. While this |
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202 significantly increases the available colors it's not very human friendly |
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203 in usage because you need to look up color codes in the `256 color mode |
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204 palette <https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit>`_. |
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205 |
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206 You can use the ``humanfriendly --demo`` command to get a demonstration of |
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207 the available colors, see also the screen shot below. Note that the small |
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208 font size in the screen shot was so that the demonstration of 256 color |
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209 mode support would fit into a single screen shot without scrolling :-) |
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210 (I wasn't feeling very creative). |
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211 |
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212 .. image:: images/ansi-demo.png |
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213 |
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214 **Support for 24-bit colors** |
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215 |
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216 In `release 4.14`_ support for 24-bit colors was added by accepting a tuple |
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217 or list with three integers representing the RGB (red, green, blue) value |
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218 of a color. This is not included in the demo because rendering millions of |
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219 colors was deemed unpractical ;-). |
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220 |
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221 .. _release 4.7: http://humanfriendly.readthedocs.io/en/latest/changelog.html#release-4-7-2018-01-14 |
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222 .. _release 4.14: http://humanfriendly.readthedocs.io/en/latest/changelog.html#release-4-14-2018-07-13 |
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223 """ |
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224 # Start with sequences that change text styles. |
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225 sequences = [ANSI_TEXT_STYLES[k] for k, v in kw.items() if k in ANSI_TEXT_STYLES and v] |
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226 # Append the color code (if any). |
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227 for color_type in 'color', 'background': |
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228 color_value = kw.get(color_type) |
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229 if isinstance(color_value, (tuple, list)): |
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230 if len(color_value) != 3: |
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231 msg = "Invalid color value %r! (expected tuple or list with three numbers)" |
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232 raise ValueError(msg % color_value) |
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233 sequences.append(48 if color_type == 'background' else 38) |
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234 sequences.append(2) |
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235 sequences.extend(map(int, color_value)) |
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236 elif isinstance(color_value, numbers.Number): |
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237 # Numeric values are assumed to be 256 color codes. |
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238 sequences.extend(( |
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239 39 if color_type == 'background' else 38, |
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240 5, int(color_value) |
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241 )) |
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242 elif color_value: |
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243 # Other values are assumed to be strings containing one of the known color names. |
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244 if color_value not in ANSI_COLOR_CODES: |
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245 msg = "Invalid color value %r! (expected an integer or one of the strings %s)" |
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246 raise ValueError(msg % (color_value, concatenate(map(repr, sorted(ANSI_COLOR_CODES))))) |
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247 # Pick the right offset for foreground versus background |
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248 # colors and regular intensity versus bright colors. |
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249 offset = ( |
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250 (100 if kw.get('bright') else 40) |
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251 if color_type == 'background' |
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252 else (90 if kw.get('bright') else 30) |
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253 ) |
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254 # Combine the offset and color code into a single integer. |
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255 sequences.append(offset + ANSI_COLOR_CODES[color_value]) |
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256 if sequences: |
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257 encoded = ANSI_CSI + ';'.join(map(str, sequences)) + ANSI_SGR |
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258 return readline_wrap(encoded) if kw.get('readline_hints') else encoded |
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259 else: |
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260 return '' |
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261 |
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262 |
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263 def ansi_width(text): |
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264 """ |
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265 Calculate the effective width of the given text (ignoring ANSI escape sequences). |
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266 |
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267 :param text: The text whose width should be calculated (a string). |
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268 :returns: The width of the text without ANSI escape sequences (an |
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269 integer). |
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270 |
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271 This function uses :func:`ansi_strip()` to strip ANSI escape sequences from |
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272 the given string and returns the length of the resulting string. |
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273 """ |
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274 return len(ansi_strip(text)) |
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275 |
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276 |
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277 def ansi_wrap(text, **kw): |
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278 """ |
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279 Wrap text in ANSI escape sequences for the given color and/or style(s). |
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280 |
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281 :param text: The text to wrap (a string). |
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282 :param kw: Any keyword arguments are passed to :func:`ansi_style()`. |
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283 :returns: The result of this function depends on the keyword arguments: |
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284 |
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285 - If :func:`ansi_style()` generates an ANSI escape sequence based |
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286 on the keyword arguments, the given text is prefixed with the |
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287 generated ANSI escape sequence and suffixed with |
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288 :data:`ANSI_RESET`. |
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289 |
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290 - If :func:`ansi_style()` returns an empty string then the text |
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291 given by the caller is returned unchanged. |
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292 """ |
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293 start_sequence = ansi_style(**kw) |
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294 if start_sequence: |
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295 end_sequence = ANSI_RESET |
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296 if kw.get('readline_hints'): |
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297 end_sequence = readline_wrap(end_sequence) |
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298 return start_sequence + text + end_sequence |
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299 else: |
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300 return text |
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301 |
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302 |
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303 def auto_encode(stream, text, *args, **kw): |
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304 """ |
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305 Reliably write Unicode strings to the terminal. |
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306 |
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307 :param stream: The file-like object to write to (a value like |
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308 :data:`sys.stdout` or :data:`sys.stderr`). |
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309 :param text: The text to write to the stream (a string). |
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310 :param args: Refer to :func:`~humanfriendly.text.format()`. |
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311 :param kw: Refer to :func:`~humanfriendly.text.format()`. |
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312 |
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313 Renders the text using :func:`~humanfriendly.text.format()` and writes it |
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314 to the given stream. If an :exc:`~exceptions.UnicodeEncodeError` is |
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315 encountered in doing so, the text is encoded using :data:`DEFAULT_ENCODING` |
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316 and the write is retried. The reasoning behind this rather blunt approach |
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317 is that it's preferable to get output on the command line in the wrong |
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318 encoding then to have the Python program blow up with a |
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319 :exc:`~exceptions.UnicodeEncodeError` exception. |
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320 """ |
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321 text = format(text, *args, **kw) |
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322 try: |
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323 stream.write(text) |
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324 except UnicodeEncodeError: |
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325 stream.write(codecs.encode(text, DEFAULT_ENCODING)) |
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326 |
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327 |
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328 def clean_terminal_output(text): |
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329 """ |
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330 Clean up the terminal output of a command. |
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331 |
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332 :param text: The raw text with special characters (a Unicode string). |
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333 :returns: A list of Unicode strings (one for each line). |
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334 |
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335 This function emulates the effect of backspace (0x08), carriage return |
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336 (0x0D) and line feed (0x0A) characters and the ANSI 'erase line' escape |
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337 sequence on interactive terminals. It's intended to clean up command output |
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338 that was originally meant to be rendered on an interactive terminal and |
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339 that has been captured using e.g. the :man:`script` program [#]_ or the |
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340 :mod:`pty` module [#]_. |
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341 |
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342 .. [#] My coloredlogs_ package supports the ``coloredlogs --to-html`` |
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343 command which uses :man:`script` to fool a subprocess into thinking |
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344 that it's connected to an interactive terminal (in order to get it |
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345 to emit ANSI escape sequences). |
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346 |
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347 .. [#] My capturer_ package uses the :mod:`pty` module to fool the current |
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348 process and subprocesses into thinking they are connected to an |
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349 interactive terminal (in order to get them to emit ANSI escape |
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350 sequences). |
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351 |
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352 **Some caveats about the use of this function:** |
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353 |
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354 - Strictly speaking the effect of carriage returns cannot be emulated |
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355 outside of an actual terminal due to the interaction between overlapping |
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356 output, terminal widths and line wrapping. The goal of this function is |
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357 to sanitize noise in terminal output while preserving useful output. |
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358 Think of it as a useful and pragmatic but possibly lossy conversion. |
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359 |
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360 - The algorithm isn't smart enough to properly handle a pair of ANSI escape |
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361 sequences that open before a carriage return and close after the last |
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362 carriage return in a linefeed delimited string; the resulting string will |
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363 contain only the closing end of the ANSI escape sequence pair. Tracking |
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364 this kind of complexity requires a state machine and proper parsing. |
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365 |
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366 .. _capturer: https://pypi.org/project/capturer |
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367 .. _coloredlogs: https://pypi.org/project/coloredlogs |
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368 """ |
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369 cleaned_lines = [] |
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370 current_line = '' |
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371 current_position = 0 |
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372 for token in CLEAN_OUTPUT_PATTERN.split(text): |
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373 if token == '\r': |
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374 # Seek back to the start of the current line. |
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375 current_position = 0 |
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376 elif token == '\b': |
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377 # Seek back one character in the current line. |
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378 current_position = max(0, current_position - 1) |
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379 else: |
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380 if token == '\n': |
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381 # Capture the current line. |
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382 cleaned_lines.append(current_line) |
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383 if token in ('\n', ANSI_ERASE_LINE): |
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384 # Clear the current line. |
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385 current_line = '' |
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386 current_position = 0 |
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387 elif token: |
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388 # Merge regular output into the current line. |
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389 new_position = current_position + len(token) |
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390 prefix = current_line[:current_position] |
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391 suffix = current_line[new_position:] |
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392 current_line = prefix + token + suffix |
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393 current_position = new_position |
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394 # Capture the last line (if any). |
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395 cleaned_lines.append(current_line) |
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396 # Remove any empty trailing lines. |
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397 while cleaned_lines and not cleaned_lines[-1]: |
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398 cleaned_lines.pop(-1) |
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399 return cleaned_lines |
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400 |
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401 |
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402 def connected_to_terminal(stream=None): |
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403 """ |
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404 Check if a stream is connected to a terminal. |
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405 |
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406 :param stream: The stream to check (a file-like object, |
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407 defaults to :data:`sys.stdout`). |
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408 :returns: :data:`True` if the stream is connected to a terminal, |
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409 :data:`False` otherwise. |
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410 |
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411 See also :func:`terminal_supports_colors()`. |
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412 """ |
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413 stream = sys.stdout if stream is None else stream |
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414 try: |
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415 return stream.isatty() |
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416 except Exception: |
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417 return False |
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418 |
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419 |
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420 @cached |
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421 def enable_ansi_support(): |
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422 """ |
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423 Try to enable support for ANSI escape sequences (required on Windows). |
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424 |
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425 :returns: :data:`True` if ANSI is supported, :data:`False` otherwise. |
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426 |
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427 This functions checks for the following supported configurations, in the |
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428 given order: |
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429 |
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430 1. On Windows, if :func:`have_windows_native_ansi_support()` confirms |
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431 native support for ANSI escape sequences :mod:`ctypes` will be used to |
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432 enable this support. |
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433 |
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434 2. On Windows, if the environment variable ``$ANSICON`` is set nothing is |
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435 done because it is assumed that support for ANSI escape sequences has |
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436 already been enabled via `ansicon <https://github.com/adoxa/ansicon>`_. |
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437 |
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438 3. On Windows, an attempt is made to import and initialize the Python |
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439 package :pypi:`colorama` instead (of course for this to work |
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440 :pypi:`colorama` has to be installed). |
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441 |
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442 4. On other platforms this function calls :func:`connected_to_terminal()` |
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443 to determine whether ANSI escape sequences are supported (that is to |
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444 say all platforms that are not Windows are assumed to support ANSI |
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445 escape sequences natively, without weird contortions like above). |
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446 |
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447 This makes it possible to call :func:`enable_ansi_support()` |
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448 unconditionally without checking the current platform. |
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449 |
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450 The :func:`~humanfriendly.decorators.cached` decorator is used to ensure |
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451 that this function is only executed once, but its return value remains |
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452 available on later calls. |
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453 """ |
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454 if have_windows_native_ansi_support(): |
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455 import ctypes |
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456 ctypes.windll.kernel32.SetConsoleMode(ctypes.windll.kernel32.GetStdHandle(-11), 7) |
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457 ctypes.windll.kernel32.SetConsoleMode(ctypes.windll.kernel32.GetStdHandle(-12), 7) |
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458 return True |
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459 elif on_windows(): |
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460 if 'ANSICON' in os.environ: |
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461 return True |
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462 try: |
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463 import colorama |
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464 colorama.init() |
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465 return True |
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466 except ImportError: |
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467 return False |
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468 else: |
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469 return connected_to_terminal() |
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470 |
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471 |
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472 def find_terminal_size(): |
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473 """ |
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474 Determine the number of lines and columns visible in the terminal. |
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475 |
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476 :returns: A tuple of two integers with the line and column count. |
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477 |
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478 The result of this function is based on the first of the following three |
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479 methods that works: |
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480 |
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481 1. First :func:`find_terminal_size_using_ioctl()` is tried, |
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482 2. then :func:`find_terminal_size_using_stty()` is tried, |
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483 3. finally :data:`DEFAULT_LINES` and :data:`DEFAULT_COLUMNS` are returned. |
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484 |
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485 .. note:: The :func:`find_terminal_size()` function performs the steps |
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486 above every time it is called, the result is not cached. This is |
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487 because the size of a virtual terminal can change at any time and |
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488 the result of :func:`find_terminal_size()` should be correct. |
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489 |
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490 `Pre-emptive snarky comment`_: It's possible to cache the result |
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491 of this function and use :mod:`signal.SIGWINCH <signal>` to |
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492 refresh the cached values! |
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493 |
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494 Response: As a library I don't consider it the role of the |
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495 :mod:`humanfriendly.terminal` module to install a process wide |
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496 signal handler ... |
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497 |
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498 .. _Pre-emptive snarky comment: http://blogs.msdn.com/b/oldnewthing/archive/2008/01/30/7315957.aspx |
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499 """ |
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500 # The first method. Any of the standard streams may have been redirected |
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501 # somewhere and there's no telling which, so we'll just try them all. |
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502 for stream in sys.stdin, sys.stdout, sys.stderr: |
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503 try: |
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504 result = find_terminal_size_using_ioctl(stream) |
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505 if min(result) >= 1: |
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506 return result |
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507 except Exception: |
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508 pass |
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509 # The second method. |
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510 try: |
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511 result = find_terminal_size_using_stty() |
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512 if min(result) >= 1: |
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513 return result |
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514 except Exception: |
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515 pass |
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516 # Fall back to conservative defaults. |
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517 return DEFAULT_LINES, DEFAULT_COLUMNS |
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518 |
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519 |
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520 def find_terminal_size_using_ioctl(stream): |
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521 """ |
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522 Find the terminal size using :func:`fcntl.ioctl()`. |
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523 |
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524 :param stream: A stream connected to the terminal (a file object with a |
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525 ``fileno`` attribute). |
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526 :returns: A tuple of two integers with the line and column count. |
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527 :raises: This function can raise exceptions but I'm not going to document |
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528 them here, you should be using :func:`find_terminal_size()`. |
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529 |
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530 Based on an `implementation found on StackOverflow <http://stackoverflow.com/a/3010495/788200>`_. |
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531 """ |
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532 if not HAVE_IOCTL: |
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533 raise NotImplementedError("It looks like the `fcntl' module is not available!") |
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534 h, w, hp, wp = struct.unpack('HHHH', fcntl.ioctl(stream, termios.TIOCGWINSZ, struct.pack('HHHH', 0, 0, 0, 0))) |
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535 return h, w |
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536 |
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537 |
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538 def find_terminal_size_using_stty(): |
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539 """ |
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540 Find the terminal size using the external command ``stty size``. |
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541 |
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542 :param stream: A stream connected to the terminal (a file object). |
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543 :returns: A tuple of two integers with the line and column count. |
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544 :raises: This function can raise exceptions but I'm not going to document |
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545 them here, you should be using :func:`find_terminal_size()`. |
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546 """ |
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547 stty = subprocess.Popen(['stty', 'size'], |
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548 stdout=subprocess.PIPE, |
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549 stderr=subprocess.PIPE) |
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550 stdout, stderr = stty.communicate() |
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551 tokens = stdout.split() |
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552 if len(tokens) != 2: |
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553 raise Exception("Invalid output from `stty size'!") |
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554 return tuple(map(int, tokens)) |
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555 |
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556 |
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557 def get_pager_command(text=None): |
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558 """ |
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559 Get the command to show a text on the terminal using a pager. |
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560 |
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561 :param text: The text to print to the terminal (a string). |
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562 :returns: A list of strings with the pager command and arguments. |
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563 |
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564 The use of a pager helps to avoid the wall of text effect where the user |
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565 has to scroll up to see where the output began (not very user friendly). |
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566 |
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567 If the given text contains ANSI escape sequences the command ``less |
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568 --RAW-CONTROL-CHARS`` is used, otherwise the environment variable |
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569 ``$PAGER`` is used (if ``$PAGER`` isn't set :man:`less` is used). |
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570 |
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571 When the selected pager is :man:`less`, the following options are used to |
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572 make the experience more user friendly: |
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573 |
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574 - ``--quit-if-one-screen`` causes :man:`less` to automatically exit if the |
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575 entire text can be displayed on the first screen. This makes the use of a |
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576 pager transparent for smaller texts (because the operator doesn't have to |
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577 quit the pager). |
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578 |
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579 - ``--no-init`` prevents :man:`less` from clearing the screen when it |
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580 exits. This ensures that the operator gets a chance to review the text |
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581 (for example a usage message) after quitting the pager, while composing |
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582 the next command. |
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583 """ |
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584 # Compose the pager command. |
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585 if text and ANSI_CSI in text: |
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586 command_line = ['less', '--RAW-CONTROL-CHARS'] |
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587 else: |
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588 command_line = [os.environ.get('PAGER', 'less')] |
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589 # Pass some additional options to `less' (to make it more |
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590 # user friendly) without breaking support for other pagers. |
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591 if os.path.basename(command_line[0]) == 'less': |
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592 command_line.append('--no-init') |
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593 command_line.append('--quit-if-one-screen') |
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594 return command_line |
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595 |
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596 |
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597 @cached |
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598 def have_windows_native_ansi_support(): |
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599 """ |
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600 Check if we're running on a Windows 10 release with native support for ANSI escape sequences. |
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601 |
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602 :returns: :data:`True` if so, :data:`False` otherwise. |
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603 |
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604 The :func:`~humanfriendly.decorators.cached` decorator is used as a minor |
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605 performance optimization. Semantically this should have zero impact because |
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606 the answer doesn't change in the lifetime of a computer process. |
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607 """ |
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608 if on_windows(): |
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609 try: |
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610 # I can't be 100% sure this will never break and I'm not in a |
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611 # position to test it thoroughly either, so I decided that paying |
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612 # the price of one additional try / except statement is worth the |
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613 # additional peace of mind :-). |
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614 components = tuple(int(c) for c in platform.version().split('.')) |
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615 return components >= (10, 0, 14393) |
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616 except Exception: |
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617 pass |
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618 return False |
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619 |
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620 |
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621 def message(text, *args, **kw): |
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622 """ |
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623 Print a formatted message to the standard error stream. |
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624 |
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625 For details about argument handling please refer to |
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626 :func:`~humanfriendly.text.format()`. |
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627 |
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628 Renders the message using :func:`~humanfriendly.text.format()` and writes |
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629 the resulting string (followed by a newline) to :data:`sys.stderr` using |
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630 :func:`auto_encode()`. |
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631 """ |
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632 auto_encode(sys.stderr, coerce_string(text) + '\n', *args, **kw) |
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633 |
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634 |
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635 def output(text, *args, **kw): |
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636 """ |
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637 Print a formatted message to the standard output stream. |
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638 |
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639 For details about argument handling please refer to |
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640 :func:`~humanfriendly.text.format()`. |
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641 |
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642 Renders the message using :func:`~humanfriendly.text.format()` and writes |
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643 the resulting string (followed by a newline) to :data:`sys.stdout` using |
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644 :func:`auto_encode()`. |
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645 """ |
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646 auto_encode(sys.stdout, coerce_string(text) + '\n', *args, **kw) |
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647 |
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648 |
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649 def readline_strip(expr): |
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650 """ |
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651 Remove `readline hints`_ from a string. |
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652 |
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653 :param text: The text to strip (a string). |
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654 :returns: The stripped text. |
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655 """ |
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656 return expr.replace('\001', '').replace('\002', '') |
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657 |
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658 |
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659 def readline_wrap(expr): |
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660 """ |
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661 Wrap an ANSI escape sequence in `readline hints`_. |
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662 |
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663 :param text: The text with the escape sequence to wrap (a string). |
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664 :returns: The wrapped text. |
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665 |
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666 .. _readline hints: http://superuser.com/a/301355 |
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667 """ |
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668 return '\001' + expr + '\002' |
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669 |
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670 |
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671 def show_pager(formatted_text, encoding=DEFAULT_ENCODING): |
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672 """ |
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673 Print a large text to the terminal using a pager. |
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674 |
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675 :param formatted_text: The text to print to the terminal (a string). |
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676 :param encoding: The name of the text encoding used to encode the formatted |
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677 text if the formatted text is a Unicode string (a string, |
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678 defaults to :data:`DEFAULT_ENCODING`). |
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679 |
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680 When :func:`connected_to_terminal()` returns :data:`True` a pager is used |
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681 to show the text on the terminal, otherwise the text is printed directly |
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682 without invoking a pager. |
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683 |
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684 The use of a pager helps to avoid the wall of text effect where the user |
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685 has to scroll up to see where the output began (not very user friendly). |
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686 |
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687 Refer to :func:`get_pager_command()` for details about the command line |
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688 that's used to invoke the pager. |
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689 """ |
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690 if connected_to_terminal(): |
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691 # Make sure the selected pager command is available. |
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692 command_line = get_pager_command(formatted_text) |
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693 if which(command_line[0]): |
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694 pager = subprocess.Popen(command_line, stdin=subprocess.PIPE) |
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695 if is_unicode(formatted_text): |
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696 formatted_text = formatted_text.encode(encoding) |
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697 pager.communicate(input=formatted_text) |
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698 return |
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699 output(formatted_text) |
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700 |
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701 |
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702 def terminal_supports_colors(stream=None): |
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703 """ |
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704 Check if a stream is connected to a terminal that supports ANSI escape sequences. |
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705 |
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706 :param stream: The stream to check (a file-like object, |
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707 defaults to :data:`sys.stdout`). |
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708 :returns: :data:`True` if the terminal supports ANSI escape sequences, |
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709 :data:`False` otherwise. |
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710 |
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711 This function was originally inspired by the implementation of |
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712 `django.core.management.color.supports_color() |
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713 <https://github.com/django/django/blob/master/django/core/management/color.py>`_ |
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714 but has since evolved significantly. |
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715 """ |
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716 if on_windows(): |
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717 # On Windows support for ANSI escape sequences is not a given. |
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718 have_ansicon = 'ANSICON' in os.environ |
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719 have_colorama = 'colorama' in sys.modules |
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720 have_native_support = have_windows_native_ansi_support() |
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721 if not (have_ansicon or have_colorama or have_native_support): |
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722 return False |
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723 return connected_to_terminal(stream) |
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724 |
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725 |
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726 def usage(usage_text): |
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727 """ |
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728 Print a human friendly usage message to the terminal. |
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729 |
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730 :param text: The usage message to print (a string). |
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731 |
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732 This function does two things: |
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733 |
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734 1. If :data:`sys.stdout` is connected to a terminal (see |
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735 :func:`connected_to_terminal()`) then the usage message is formatted |
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736 using :func:`.format_usage()`. |
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737 2. The usage message is shown using a pager (see :func:`show_pager()`). |
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738 """ |
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739 if terminal_supports_colors(sys.stdout): |
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740 usage_text = format_usage(usage_text) |
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741 show_pager(usage_text) |
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742 |
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743 |
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744 def warning(text, *args, **kw): |
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745 """ |
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746 Show a warning message on the terminal. |
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747 |
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748 For details about argument handling please refer to |
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749 :func:`~humanfriendly.text.format()`. |
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750 |
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751 Renders the message using :func:`~humanfriendly.text.format()` and writes |
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752 the resulting string (followed by a newline) to :data:`sys.stderr` using |
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753 :func:`auto_encode()`. |
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754 |
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755 If :data:`sys.stderr` is connected to a terminal that supports colors, |
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756 :func:`ansi_wrap()` is used to color the message in a red font (to make |
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757 the warning stand out from surrounding text). |
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758 """ |
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759 text = coerce_string(text) |
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760 if terminal_supports_colors(sys.stderr): |
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761 text = ansi_wrap(text, color='red') |
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762 auto_encode(sys.stderr, text + '\n', *args, **kw) |
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763 |
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764 |
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765 # Define aliases for backwards compatibility. |
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766 define_aliases( |
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767 module_name=__name__, |
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768 # In humanfriendly 1.31 the find_meta_variables() and format_usage() |
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769 # functions were extracted to the new module humanfriendly.usage. |
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770 find_meta_variables='humanfriendly.usage.find_meta_variables', |
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771 format_usage='humanfriendly.usage.format_usage', |
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772 # In humanfriendly 8.0 the html_to_ansi() function and HTMLConverter |
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773 # class were extracted to the new module humanfriendly.terminal.html. |
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774 html_to_ansi='humanfriendly.terminal.html.html_to_ansi', |
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775 HTMLConverter='humanfriendly.terminal.html.HTMLConverter', |
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776 ) |