Mercurial > libervia-backend
annotate libervia/backend/tools/common/utils.py @ 4089:e7ee611fc860
tools (common/template): allow use of extra attributes in `icon` function
author | Goffi <goffi@goffi.org> |
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date | Thu, 08 Jun 2023 21:28:26 +0200 |
parents | 4b842c1fb686 |
children | e11b13418ba6 |
rev | line source |
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1 #!/usr/bin/env python3 |
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2 |
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Renamed the project from "Salut à Toi" to "Libervia":
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3 # Libervia: an XMPP client |
3479 | 4 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org) |
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5 |
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6 # This program is free software: you can redistribute it and/or modify |
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7 # it under the terms of the GNU Affero General Public License as published by |
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8 # the Free Software Foundation, either version 3 of the License, or |
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9 # (at your option) any later version. |
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10 |
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11 # This program is distributed in the hope that it will be useful, |
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 # GNU Affero General Public License for more details. |
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15 |
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16 # You should have received a copy of the GNU Affero General Public License |
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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18 |
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19 """Misc utils for both backend and frontends""" |
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20 |
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21 import collections.abc |
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22 size_units = { |
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23 "b": 1, |
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24 "kb": 1000, |
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25 "mb": 1000**2, |
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26 "gb": 1000**3, |
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27 "tb": 1000**4, |
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28 "pb": 1000**5, |
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29 "eb": 1000**6, |
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30 "zb": 1000**7, |
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31 "yb": 1000**8, |
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32 "o": 1, |
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33 "ko": 1000, |
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34 "mo": 1000**2, |
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35 "go": 1000**3, |
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36 "to": 1000**4, |
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37 "po": 1000**5, |
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38 "eo": 1000**6, |
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39 "zo": 1000**7, |
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40 "yo": 1000**8, |
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41 "kib": 1024, |
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42 "mib": 1024**2, |
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43 "gib": 1024**3, |
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44 "tib": 1024**4, |
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45 "pib": 1024**5, |
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46 "eib": 1024**6, |
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47 "zib": 1024**7, |
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48 "yib": 1024**8, |
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49 "kio": 1024, |
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50 "mio": 1024**2, |
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51 "gio": 1024**3, |
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52 "tio": 1024**4, |
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53 "pio": 1024**5, |
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54 "eio": 1024**6, |
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55 "zio": 1024**7, |
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56 "yio": 1024**8, |
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57 } |
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58 |
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59 |
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60 def per_luminance(red, green, blue): |
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61 """Caculate the perceived luminance of a RGB color |
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62 |
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63 @param red(int): 0-1 normalized value of red |
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64 @param green(int): 0-1 normalized value of green |
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65 @param blue(int): 0-1 normalized value of blue |
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66 @return (float): 0-1 value of luminance (<0.5 is dark, else it's light) |
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67 """ |
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68 # cf. https://stackoverflow.com/a/1855903, thanks Gacek |
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69 |
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70 return 0.299 * red + 0.587 * green + 0.114 * blue |
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71 |
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72 |
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73 def recursive_update(ori: dict, update: dict): |
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74 """Recursively update a dictionary""" |
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75 # cf. https://stackoverflow.com/a/3233356, thanks Alex Martelli |
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76 for k, v in update.items(): |
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77 if isinstance(v, collections.abc.Mapping): |
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78 ori[k] = recursive_update(ori.get(k, {}), v) |
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79 else: |
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80 ori[k] = v |
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81 return ori |
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82 |
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83 class OrderedSet(collections.abc.MutableSet): |
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84 """A mutable sequence which doesn't keep duplicates""" |
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85 # TODO: complete missing set methods |
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86 |
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87 def __init__(self, values=None): |
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88 self._dict = {} |
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89 if values is not None: |
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90 self.update(values) |
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91 |
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92 def __len__(self): |
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93 return len(self._dict) |
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94 |
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95 def __iter__(self): |
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96 return iter(self._dict.keys()) |
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97 |
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98 def __contains__(self, item): |
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99 return item in self._dict |
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100 |
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101 def add(self, item): |
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102 self._dict[item] = None |
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103 |
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104 def discard(self, item): |
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105 try: |
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106 del self._dict[item] |
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107 except KeyError: |
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108 pass |
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109 |
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110 def update(self, items): |
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111 self._dict.update({i: None for i in items}) |
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112 |
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113 |
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114 def parse_size(size): |
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115 """Parse a file size with optional multiple symbole""" |
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116 try: |
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117 return int(size) |
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118 except ValueError: |
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119 number = [] |
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120 symbol = [] |
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121 try: |
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122 for c in size: |
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123 if c == " ": |
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124 continue |
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125 if c.isdigit(): |
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126 number.append(c) |
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127 elif c.isalpha(): |
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128 symbol.append(c) |
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129 else: |
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130 raise ValueError("unexpected char in size: {c!r} (size: {size!r})") |
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131 number = int("".join(number)) |
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132 symbol = "".join(symbol) |
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133 if symbol: |
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134 try: |
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135 multiplier = size_units[symbol.lower()] |
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136 except KeyError: |
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137 raise ValueError( |
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138 "unknown size multiplier symbole: {symbol!r} (size: {size!r})") |
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139 else: |
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140 return number * multiplier |
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141 return number |
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142 except Exception as e: |
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143 raise ValueError(f"invalid size: {e}") |
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144 |
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145 |
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146 def get_size_multiplier(size, suffix="o"): |
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147 """Get multiplier of a file size""" |
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148 size = int(size) |
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149 # cf. https://stackoverflow.com/a/1094933 (thanks) |
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150 for unit in ["", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi"]: |
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151 if abs(size) < 1024.0: |
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152 return size, f"{unit}{suffix}" |
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153 size /= 1024.0 |
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154 return size, f"Yi{suffix}" |
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155 |
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156 |
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157 def get_human_size(size, suffix="o", sep=" "): |
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158 size, symbol = get_size_multiplier(size, suffix) |
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159 return f"{size:.2f}{sep}{symbol}" |