File: nn.py 1 #!/usr/bin/python3 2 3 # The MIT License (MIT) 4 # 5 # Copyright © 2025 pacman64 6 # 7 # Permission is hereby granted, free of charge, to any person obtaining a copy 8 # of this software and associated documentation files (the “Software”), to deal 9 # in the Software without restriction, including without limitation the rights 10 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 # copies of the Software, and to permit persons to whom the Software is 12 # furnished to do so, subject to the following conditions: 13 # 14 # The above copyright notice and this permission notice shall be included in 15 # all copies or substantial portions of the Software. 16 # 17 # THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 20 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 23 # SOFTWARE. 24 25 26 # Notes 27 # 28 # String-slicing was a major source of inefficiencies in this script, making 29 # it viable only for small inputs; it's not clear what the stdlib offers to 30 # loop over sub-strings without copying data, which is really needed in this 31 # case. 32 # 33 # String-slicing seems to be amortized in more recent versions of Python. 34 # 35 # In the end the code has become much uglier by using explicit index-pairs, 36 # which are used/updated all over to avoid copying sub-strings. 37 38 39 from io import SEEK_CUR 40 from sys import argv, exit, stderr, stdin, stdout 41 42 43 info = ''' 44 nn [option...] [filepaths/URIs...] 45 46 47 Nice Numbers restyles all runs of 4+ digits by alternating ANSI-styles 48 every 3-digit group, so long numbers become easier to read at a glance. 49 50 All (optional) leading options start with either single or double-dash, 51 and most of them change the style/color used. Some of the options are, 52 shown in their single-dash form: 53 54 -h show this help message 55 -help show this help message 56 57 -b use a blue color 58 -blue use a blue color 59 -bold bold-style digits 60 -g use a green color 61 -gray use a gray color (default) 62 -green use a green color 63 -hi use a highlighting/inverse style 64 -highlight use a highlighting/inverse style 65 -hilite use a highlighting/inverse style 66 -inverse use a highlighting/inverse style 67 -m use a magenta color 68 -magenta use a magenta color 69 -o use an orange color 70 -orange use an orange color 71 -p use a purple color 72 -purple use a purple color 73 -r use a red color 74 -red use a red color 75 -u underline digits 76 -underline underline digits 77 ''' 78 79 # handle standard help cmd-line options, quitting right away in that case 80 if len(argv) > 1 and argv[1] in ('-h', '--h', '-help', '--help'): 81 print(info.strip()) 82 exit(0) 83 84 85 # names_aliases normalizes lookup keys for table names2styles 86 names_aliases = { 87 'b': 'blue', 88 'g': 'green', 89 'm': 'magenta', 90 'o': 'orange', 91 'p': 'purple', 92 'r': 'red', 93 'u': 'underline', 94 95 'bb': 'blueback', 96 'bg': 'greenback', 97 'bm': 'magentaback', 98 'bo': 'orangeback', 99 'bp': 'purpleback', 100 'br': 'redback', 101 102 'gb': 'greenback', 103 'mb': 'magentaback', 104 'ob': 'orangeback', 105 'pb': 'purpleback', 106 'rb': 'redback', 107 108 'hi': 'inverse', 109 'inv': 'inverse', 110 111 'flip': 'inverse', 112 'swap': 'inverse', 113 114 'reset': 'plain', 115 'highlight': 'inverse', 116 'hilite': 'inverse', 117 'invert': 'inverse', 118 'inverted': 'inverse', 119 'swapped': 'inverse', 120 121 'under': 'underline', 122 123 'bgblue': 'blueback', 124 'bggray': 'grayback', 125 'bggreen': 'greenback', 126 'bgmagenta': 'magentaback', 127 'bgorange': 'orangeback', 128 'bgpurple': 'purpleback', 129 'bgred': 'redback', 130 131 'bluebg': 'blueback', 132 'graybg': 'grayback', 133 'greenbg': 'greenback', 134 'magentabg': 'magentaback', 135 'orangebg': 'orangeback', 136 'purplebg': 'purpleback', 137 'redbg': 'redback', 138 139 'backblue': 'blueback', 140 'backgray': 'grayback', 141 'backgreen': 'greenback', 142 'backmagenta': 'magentaback', 143 'backorange': 'orangeback', 144 'backpurple': 'purpleback', 145 'backred': 'redback', 146 } 147 148 # names2styles matches color/style names to their ANSI-style strings 149 names2styles = { 150 'blue': '\x1b[38;2;0;95;215m', 151 'bold': '\x1b[1m', 152 'gray': '\x1b[38;2;168;168;168m', 153 'green': '\x1b[38;2;0;135;95m', 154 'inverse': '\x1b[7m', 155 'magenta': '\x1b[38;2;215;0;255m', 156 'orange': '\x1b[38;2;215;95;0m', 157 'plain': '\x1b[0m', 158 'purple': '\x1b[38;2;135;95;255m', 159 'red': '\x1b[38;2;204;0;0m', 160 'underline': '\x1b[4m', 161 162 'blueback': '\x1b[48;2;0;95;215m\x1b[38;2;238;238;238m', 163 'grayback': '\x1b[48;2;168;168;168m\x1b[38;2;238;238;238m', 164 'greenback': '\x1b[48;2;0;135;95m\x1b[38;2;238;238;238m', 165 'magentaback': '\x1b[48;2;215;0;255m\x1b[38;2;238;238;238m', 166 'orangeback': '\x1b[48;2;215;95;0m\x1b[38;2;238;238;238m', 167 'purpleback': '\x1b[48;2;135;95;255m\x1b[38;2;238;238;238m', 168 'redback': '\x1b[48;2;204;0;0m\x1b[38;2;238;238;238m', 169 } 170 171 172 def restyle_line(w, line: str, style: str) -> None: 173 'Alternate styles for runs of digits in the string given.' 174 175 start = 0 176 end = len(line) 177 if end > 1 and line[end - 2] == '\r' and line[end - 1] == '\n': 178 end -= 2 179 elif end > 0 and line[end - 1] == '\n': 180 end -= 1 181 182 while True: 183 # see if line is over 184 if start >= end: 185 w.write('\n') 186 return 187 188 # find where the next run of digits starts, if present 189 i = -1 190 for j in range(start, end): 191 if line[j].isdigit(): 192 i = j 193 break 194 195 # check if rest of the line has no more digits 196 if i < 0: 197 w.write(line[start:end]) 198 w.write('\n') 199 return 200 201 # some ANSI-style sequences use 4-digit numbers, which are long 202 # enough for this script to mangle 203 is_ansi = i >= 2 and line[i-2] == '\x1b' and line[i-1] == '[' 204 205 # emit line up to right before the next run of digits starts 206 w.write(line[start:i]) 207 start = i 208 209 # find where/if the current run of digits ends 210 i = -1 211 for j in range(start, end): 212 if not line[j].isdigit(): 213 i = j 214 break 215 216 # check if rest of the line has only digits in it 217 if i < 0: 218 if not is_ansi: 219 restyle_digits(w, line, start, end, style) 220 else: 221 w.write(line[start:end]) 222 w.write('\n') 223 return 224 225 # emit digits using alternate styling, and advance past them 226 if not is_ansi: 227 restyle_digits(w, line, start, i, style) 228 else: 229 w.write(line[start:i]) 230 start = i 231 232 233 def restyle_digits(w, digits: str, start: int, end: int, style: str) -> None: 234 'Alternate styles on 3-item chunks from the string given.' 235 236 diff = end - start 237 238 # it's overall quicker to just emit short-enough digit-runs verbatim 239 if diff < 4: 240 w.write(digits[start:end]) 241 return 242 243 # emit leading chunk of digits, which is the only one which 244 # can have fewer than 3 items 245 lead = diff % 3 246 w.write(digits[start:start + lead]) 247 248 # the rest of the sub-string now has a multiple of 3 items left 249 start += lead 250 251 # start by styling the next digit-group only if there was a 252 # non-empty leading group at the start of the full digit-run 253 use_style = lead > 0 254 255 # alternate styles until the string is over 256 while start < end: 257 # the digits left are always a multiple of 3 258 stop = start + 3 259 260 if use_style: 261 w.write(style) 262 w.write(digits[start:stop]) 263 w.write('\x1b[0m') 264 else: 265 w.write(digits[start:stop]) 266 267 # switch style and advance to the next 3-digit chunk 268 use_style = not use_style 269 start = stop 270 271 272 def seems_url(s: str) -> bool: 273 protocols = ('https://', 'http://', 'file://', 'ftp://', 'data:') 274 return any(s.startswith(p) for p in protocols) 275 276 277 def handle_lines(w, src, style: str, live: bool) -> None: 278 for line in src: 279 restyle_line(w, line, style) 280 if live: 281 w.flush() 282 283 284 args = argv[1:] 285 style = names2styles['gray'] 286 287 # handle leading style/color option, if present 288 if len(args) > 0 and args[0].startswith('-'): 289 s = args[0].lstrip('-') 290 if s in names_aliases: 291 s = names_aliases[s] 292 293 if s in names2styles: 294 style = names2styles[s] 295 args = args[1:] 296 297 if any(seems_url(e) for e in args): 298 from io import TextIOWrapper 299 from urllib.request import urlopen 300 301 try: 302 if args.count('-') > 1: 303 msg = 'reading from `-` (standard input) more than once not allowed' 304 raise ValueError(msg) 305 306 try: 307 stdout.seek(0, SEEK_CUR) 308 live = False 309 except: 310 live = True 311 312 for path in args: 313 if path == '-': 314 handle_lines(stdout, stdin, style, live) 315 continue 316 317 if seems_url(path): 318 with urlopen(path) as inp: 319 with TextIOWrapper(inp, encoding='utf-8') as txt: 320 handle_lines(stdout, txt, style, live) 321 continue 322 323 with open(path, encoding='utf-8') as inp: 324 handle_lines(stdout, inp, style, live) 325 326 if len(args) == 0: 327 handle_lines(stdout, stdin, style, live) 328 except BrokenPipeError: 329 # quit quietly, instead of showing a confusing error message 330 stderr.close() 331 exit(0) 332 except KeyboardInterrupt: 333 exit(2) 334 except Exception as e: 335 print(str(e), file=stderr) 336 exit(1)