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1 | 1 | # encoding: utf-8 |
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2 | 2 | """ |
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3 | 3 | IO related utilities. |
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4 | 4 | """ |
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5 | 5 | |
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6 | 6 | # Copyright (c) IPython Development Team. |
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7 | 7 | # Distributed under the terms of the Modified BSD License. |
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8 | 8 | |
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9 | 9 | |
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10 | 10 | |
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11 | 11 | import atexit |
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12 | 12 | import os |
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13 | 13 | import sys |
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14 | 14 | import tempfile |
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15 | 15 | from pathlib import Path |
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16 | 16 | from warnings import warn |
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17 | 17 | |
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18 | 18 | from IPython.utils.decorators import undoc |
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19 | 19 | from .capture import CapturedIO, capture_output |
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20 | 20 | |
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21 | 21 | class Tee(object): |
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22 | 22 | """A class to duplicate an output stream to stdout/err. |
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23 | 23 | |
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24 | 24 | This works in a manner very similar to the Unix 'tee' command. |
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25 | 25 | |
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26 | 26 | When the object is closed or deleted, it closes the original file given to |
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27 | 27 | it for duplication. |
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28 | 28 | """ |
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29 | 29 | # Inspired by: |
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30 | 30 | # http://mail.python.org/pipermail/python-list/2007-May/442737.html |
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31 | 31 | |
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32 | 32 | def __init__(self, file_or_name, mode="w", channel='stdout'): |
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33 | 33 | """Construct a new Tee object. |
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34 | 34 | |
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35 | 35 | Parameters |
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36 | 36 | ---------- |
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37 | 37 | file_or_name : filename or open filehandle (writable) |
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38 | 38 | File that will be duplicated |
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39 | 39 | mode : optional, valid mode for open(). |
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40 | 40 | If a filename was give, open with this mode. |
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41 | 41 | channel : str, one of ['stdout', 'stderr'] |
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42 | 42 | """ |
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43 | 43 | if channel not in ['stdout', 'stderr']: |
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44 | 44 | raise ValueError('Invalid channel spec %s' % channel) |
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45 | 45 | |
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46 | 46 | if hasattr(file_or_name, 'write') and hasattr(file_or_name, 'seek'): |
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47 | 47 | self.file = file_or_name |
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48 | 48 | else: |
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49 | 49 | encoding = None if "b" in mode else "utf-8" |
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50 | 50 | self.file = open(file_or_name, mode, encoding=encoding) |
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51 | 51 | self.channel = channel |
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52 | 52 | self.ostream = getattr(sys, channel) |
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53 | 53 | setattr(sys, channel, self) |
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54 | 54 | self._closed = False |
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55 | 55 | |
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56 | 56 | def close(self): |
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57 | 57 | """Close the file and restore the channel.""" |
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58 | 58 | self.flush() |
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59 | 59 | setattr(sys, self.channel, self.ostream) |
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60 | 60 | self.file.close() |
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61 | 61 | self._closed = True |
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62 | 62 | |
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63 | 63 | def write(self, data): |
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64 | 64 | """Write data to both channels.""" |
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65 | 65 | self.file.write(data) |
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66 | 66 | self.ostream.write(data) |
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67 | 67 | self.ostream.flush() |
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68 | 68 | |
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69 | 69 | def flush(self): |
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70 | 70 | """Flush both channels.""" |
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71 | 71 | self.file.flush() |
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72 | 72 | self.ostream.flush() |
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73 | 73 | |
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74 | 74 | def __del__(self): |
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75 | 75 | if not self._closed: |
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76 | 76 | self.close() |
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77 | 77 | |
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78 | 78 | def isatty(self): |
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79 | 79 | return False |
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80 | 80 | |
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81 | 81 | def ask_yes_no(prompt, default=None, interrupt=None): |
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82 | 82 | """Asks a question and returns a boolean (y/n) answer. |
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83 | 83 | |
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84 | 84 | If default is given (one of 'y','n'), it is used if the user input is |
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85 | 85 | empty. If interrupt is given (one of 'y','n'), it is used if the user |
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86 | 86 | presses Ctrl-C. Otherwise the question is repeated until an answer is |
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87 | 87 | given. |
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88 | 88 | |
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89 | 89 | An EOF is treated as the default answer. If there is no default, an |
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90 | 90 | exception is raised to prevent infinite loops. |
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91 | 91 | |
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92 | 92 | Valid answers are: y/yes/n/no (match is not case sensitive).""" |
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93 | 93 | |
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94 | 94 | answers = {'y':True,'n':False,'yes':True,'no':False} |
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95 | 95 | ans = None |
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96 | 96 | while ans not in answers.keys(): |
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97 | 97 | try: |
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98 | 98 | ans = input(prompt+' ').lower() |
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99 | 99 | if not ans: # response was an empty string |
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100 | 100 | ans = default |
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101 | 101 | except KeyboardInterrupt: |
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102 | 102 | if interrupt: |
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103 | 103 | ans = interrupt |
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104 | 104 | print("\r") |
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105 | 105 | except EOFError: |
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106 | 106 | if default in answers.keys(): |
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107 | 107 | ans = default |
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108 | 108 | print() |
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109 | 109 | else: |
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110 | 110 | raise |
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111 | 111 | |
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112 | 112 | return answers[ans] |
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113 | 113 | |
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114 | 114 | |
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115 | 115 | def temp_pyfile(src, ext='.py'): |
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116 | 116 | """Make a temporary python file, return filename and filehandle. |
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117 | 117 | |
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118 | 118 | Parameters |
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119 | 119 | ---------- |
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120 | 120 | src : string or list of strings (no need for ending newlines if list) |
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121 | 121 | Source code to be written to the file. |
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122 | 122 | ext : optional, string |
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123 | 123 | Extension for the generated file. |
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124 | 124 | |
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125 | 125 | Returns |
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126 | 126 | ------- |
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127 | 127 | (filename, open filehandle) |
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128 | 128 | It is the caller's responsibility to close the open file and unlink it. |
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129 | 129 | """ |
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130 | 130 | fname = tempfile.mkstemp(ext)[1] |
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131 | 131 | with open(Path(fname), "w", encoding="utf-8") as f: |
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132 | 132 | f.write(src) |
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133 | 133 | f.flush() |
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134 | 134 | return fname |
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135 | ||
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136 | ||
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137 | @undoc | |
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138 | def raw_print(*args, **kw): | |
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139 | """DEPRECATED: Raw print to sys.__stdout__, otherwise identical interface to print().""" | |
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140 | warn("IPython.utils.io.raw_print has been deprecated since IPython 7.0", DeprecationWarning, stacklevel=2) | |
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141 | ||
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142 | print(*args, sep=kw.get('sep', ' '), end=kw.get('end', '\n'), | |
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143 | file=sys.__stdout__) | |
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144 | sys.__stdout__.flush() | |
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145 | ||
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146 | @undoc | |
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147 | def raw_print_err(*args, **kw): | |
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148 | """DEPRECATED: Raw print to sys.__stderr__, otherwise identical interface to print().""" | |
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149 | warn("IPython.utils.io.raw_print_err has been deprecated since IPython 7.0", DeprecationWarning, stacklevel=2) | |
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150 | ||
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151 | print(*args, sep=kw.get('sep', ' '), end=kw.get('end', '\n'), | |
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152 | file=sys.__stderr__) | |
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153 | sys.__stderr__.flush() |
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