2 # -*- coding: utf-8 -*-
4 # © Copyright 2021-2022, Scott Gasch
7 Utilities for dealing with and creating text chunks. For example:
9 - Make a bar graph / progress graph,
11 - left, right, center, justify text,
13 - indent / dedent text,
14 - create a header line,
15 - draw a box around some text.
26 from collections import defaultdict
27 from dataclasses import dataclass
28 from typing import Dict, Generator, List, Literal, Optional, Tuple
30 from pyutils import string_utils
31 from pyutils.ansi import fg, reset
33 logger = logging.getLogger(__file__)
44 """Number of columns"""
47 def get_console_rows_columns() -> RowsColumns:
50 The number of rows/columns on the current console or None
51 if we can't tell or an error occurred.
53 from pyutils.exec_utils import cmd
55 rows: Optional[str] = os.environ.get('LINES', None)
56 cols: Optional[str] = os.environ.get('COLUMNS', None)
57 if not rows or not cols:
58 logger.debug('Rows: %s, cols: %s, trying stty.', rows, cols)
69 logger.debug('Rows: %s, cols: %s, tput rows.', rows, cols)
79 logger.debug('Rows: %s, cols: %s, tput cols.', rows, cols)
88 if not rows or not cols:
89 raise Exception('Can\'t determine console size?!')
90 return RowsColumns(int(rows), int(cols))
93 class BarGraphText(enum.Enum):
94 """What kind of text to include at the end of the bar graph?"""
97 """None, leave it blank."""
111 text: BarGraphText = BarGraphText.PERCENTAGE,
112 fgcolor=fg("school bus yellow"),
117 """Draws a progress graph at the current cursor position.
120 current: how many have we done so far?
121 total: how many are there to do total?
122 text: how should we render the text at the end?
123 width: how many columns wide should be progress graph be?
124 fgcolor: what color should "done" part of the graph be?
125 left_end: the character at the left side of the graph
126 right_end: the character at the right side of the graph
127 redraw: if True, omit a line feed after the carriage return
128 so that subsequent calls to this method redraw the graph
131 See also :meth:`bar_graph_string`, :meth:`sparkline`.
135 '[███████████████████████████████████ ] 0.5'
138 ret = "\r" if redraw else "\n"
139 bar = bar_graph_string(
148 print(bar, end=ret, flush=True, file=sys.stderr)
151 def _make_bar_graph_text(
152 text: BarGraphText, current: int, total: int, percentage: float
154 if text == BarGraphText.NONE:
156 elif text == BarGraphText.PERCENTAGE:
157 return f'{percentage:.1f}'
158 elif text == BarGraphText.FRACTION:
159 return f'{current} / {total}'
160 raise ValueError(text)
163 def bar_graph_string(
167 text: BarGraphText = BarGraphText.PERCENTAGE,
169 fgcolor=fg("school bus yellow"),
174 """Returns a string containing a bar graph.
177 current: how many have we done so far?
178 total: how many are there to do total?
179 text: how should we render the text at the end?
180 width: how many columns wide should be progress graph be?
181 fgcolor: what color should "done" part of the graph be?
182 reset_seq: sequence to use to turn off color
183 left_end: the character at the left side of the graph
184 right_end: the character at the right side of the graph
186 See also :meth:`bar_graph`, :meth:`sparkline`.
188 >>> bar_graph_string(5, 10, fgcolor='', reset_seq='')
189 '[███████████████████████████████████ ] 0.5'
194 percentage = float(current) / float(total)
197 if percentage < 0.0 or percentage > 1.0:
198 raise ValueError(percentage)
199 text = _make_bar_graph_text(text, current, total, percentage)
200 whole_width = math.floor(percentage * width)
201 if whole_width == width:
204 elif whole_width == 0 and percentage > 0.0:
207 remainder_width = (percentage * width) % 1
208 part_width = math.floor(remainder_width * 8)
209 part_char = [" ", "▏", "▎", "▍", "▌", "▋", "▊", "▉"][part_width]
215 + " " * (width - whole_width - 1)
223 def sparkline(numbers: List[float]) -> Tuple[float, float, str]:
225 Makes a "sparkline" little inline histogram graph. Auto scales.
228 numbers: the population over which to create the sparkline
231 a three tuple containing:
233 * the minimum number in the population
234 * the maximum number in the population
235 * a string representation of the population in a concise format
237 See also :meth:`bar_graph`, :meth:`bar_graph_string`.
239 >>> sparkline([1, 2, 3, 5, 10, 3, 5, 7])
242 >>> sparkline([104, 99, 93, 96, 82, 77, 85, 73])
243 (73, 104, '█▇▆▆▃▂▄▁')
246 _bar = '▁▂▃▄▅▆▇█' # Unicode: 9601, 9602, 9603, 9604, 9605, 9606, 9607, 9608
249 min_num, max_num = min(numbers), max(numbers)
250 span = max_num - min_num
252 _bar[min([barcount - 1, int((n - min_num) / span * barcount)])] for n in numbers
254 return min_num, max_num, sline
257 def distribute_strings(
264 Distributes strings into a line for justified text.
267 strings: a list of string tokens to distribute
268 width: the width of the line to create
269 padding: the padding character to place between string chunks
272 The distributed, justified string.
274 See also :meth:`justify_string`, :meth:`justify_text`.
276 >>> distribute_strings(['this', 'is', 'a', 'test'], width=40)
279 ret = ' ' + ' '.join(strings) + ' '
280 assert len(string_utils.strip_ansi_sequences(ret)) < width
282 while len(string_utils.strip_ansi_sequences(ret)) < width:
283 spaces = [m.start() for m in re.finditer(r' ([^ ]|$)', ret)]
287 ret = before + padding + after
294 def _justify_string_by_chunk(string: str, width: int = 80, padding: str = " ") -> str:
296 Justifies a string chunk by chunk.
299 string: the string to be justified
300 width: how wide to make the output
301 padding: what padding character to use between chunks
306 >>> _justify_string_by_chunk("This is a test", 40)
308 >>> _justify_string_by_chunk("This is a test", 20)
312 assert len(string_utils.strip_ansi_sequences(string)) <= width
314 first, *rest, last = string.split()
316 len(string_utils.strip_ansi_sequences(first))
317 + len(string_utils.strip_ansi_sequences(last))
319 ret = first + distribute_strings(rest, width=w, padding=padding) + last
324 string: str, *, width: int = 80, alignment: str = "c", padding: str = " "
326 """Justify a string to width with left, right, center of justified
330 string: the string to justify
331 width: the width to justify the string to
332 alignment: a single character indicating the desired alignment:
333 * 'c' = centered within the width
334 * 'j' = justified at width
335 * 'l' = left alignment
336 * 'r' = right alignment
337 padding: the padding character to use while justifying
339 >>> justify_string('This is another test', width=40, alignment='c')
340 ' This is another test '
341 >>> justify_string('This is another test', width=40, alignment='l')
342 'This is another test '
343 >>> justify_string('This is another test', width=40, alignment='r')
344 ' This is another test'
345 >>> justify_string('This is another test', width=40, alignment='j')
346 'This is another test'
348 alignment = alignment[0]
350 while len(string_utils.strip_ansi_sequences(string)) < width:
353 elif alignment == "r":
354 string = padding + string
355 elif alignment == "j":
356 return _justify_string_by_chunk(string, width=width, padding=padding)
357 elif alignment == "c":
358 if len(string) % 2 == 0:
361 string = padding + string
368 text: str, *, width: int = 80, alignment: str = "c", indent_by: int = 0
370 """Justifies text with left, right, centered or justified alignment
371 and optionally with initial indentation.
374 text: the text to be justified
375 width: the width at which to justify text
376 alignment: a single character indicating the desired alignment:
377 * 'c' = centered within the width
378 * 'j' = justified at width
379 * 'l' = left alignment
380 * 'r' = right alignment
381 indent_by: if non-zero, adds n prefix spaces to indent the text.
386 See also :meth:`justify_text`.
388 >>> justify_text('This is a test of the emergency broadcast system. This is only a test.',
389 ... width=40, alignment='j') #doctest: +NORMALIZE_WHITESPACE
390 'This is a test of the emergency\\nbroadcast system. This is only a test.'
396 indent += ' ' * indent_by
399 for word in text.split():
401 len(string_utils.strip_ansi_sequences(line))
402 + len(string_utils.strip_ansi_sequences(word))
405 line = justify_string(line, width=width, alignment=alignment)
406 retval = retval + '\n' + line
408 line = line + ' ' + word
409 if len(string_utils.strip_ansi_sequences(line)) > 0:
411 retval += "\n" + justify_string(line[1:], width=width, alignment=alignment)
413 retval += "\n" + line[1:]
417 def generate_padded_columns(text: List[str]) -> Generator:
418 """Given a list of strings, break them into columns using :meth:`split`
419 and then compute the maximum width of each column. Finally,
420 distribute the columular chunks into the output padding each to
424 text: a list of strings to chunk into padded columns
427 padded columns based on text.split()
429 >>> for x in generate_padded_columns(
430 ... [ 'reading writing arithmetic',
431 ... 'mathematics psychology physics',
432 ... 'communications sociology anthropology' ]):
434 reading writing arithmetic
435 mathematics psychology physics
436 communications sociology anthropology
438 max_width: Dict[int, int] = defaultdict(int)
440 for pos, word in enumerate(line.split()):
441 max_width[pos] = max(
442 max_width[pos], len(string_utils.strip_ansi_sequences(word))
447 for pos, word in enumerate(line.split()):
448 width = max_width[pos]
449 word = justify_string(word, width=width, alignment='l')
454 def wrap_string(text: str, n: int) -> str:
457 text: the string to be wrapped
458 n: the width after which to wrap text
461 The wrapped form of text
463 chunks = text.split()
467 if width + len(string_utils.strip_ansi_sequences(chunk)) > n:
471 width += len(string_utils.strip_ansi_sequences(chunk)) + 1
475 class Indenter(contextlib.AbstractContextManager):
477 Context manager that indents stuff (even recursively). e.g.::
479 with Indenter(pad_count = 8) as i:
496 pad_prefix: Optional[str] = None,
500 """Construct an Indenter.
503 pad_prefix: an optional prefix to prepend to each line
504 pad_char: the character used to indent
505 pad_count: the number of pad_chars to use to indent
508 if pad_prefix is not None:
509 self.pad_prefix = pad_prefix
512 self.padding = pad_char * pad_count
518 def __exit__(self, exc_type, exc_value, exc_tb) -> Literal[False]:
524 def print(self, *arg, **kwargs):
525 text = string_utils.sprintf(*arg, **kwargs)
526 print(self.pad_prefix + self.padding * self.level + text, end='')
532 width: Optional[int] = None,
533 align: Optional[str] = None,
534 style: Optional[str] = 'solid',
535 color: Optional[str] = None,
538 Creates a nice header line with a title.
542 width: how wide to make the header
543 align: "left" or "right"
544 style: "ascii", "solid" or "dashed"
547 The header as a string.
549 >>> header('title', width=60, style='ascii')
550 '----[ title ]-----------------------------------------------'
554 width = get_console_rows_columns().columns
562 text_len = len(string_utils.strip_ansi_sequences(title))
565 right = width - (left + text_len + 4)
566 elif align == 'right':
568 left = width - (right + text_len + 4)
570 left = int((width - (text_len + 4)) / 2)
572 while left + text_len + 4 + right < width:
579 elif style == 'dashed':
607 title: Optional[str] = None,
608 text: Optional[str] = None,
614 Make a nice unicode box (optionally with color) around some text.
617 title: the title of the box
618 text: the text in the box
619 width: the box's width
620 color: the box's color
625 See also :meth:`print_box`, :meth:`preformatted_box`.
627 >>> print(box('title', 'this is some text', width=20).strip())
637 text = justify_text(text, width=width - 4, alignment='l')
638 return preformatted_box(title, text, width=width, color=color)
641 def preformatted_box(
642 title: Optional[str] = None,
643 text: Optional[str] = None,
648 """Creates a nice box with rounded corners and returns it as a string.
651 title: the title of the box
652 text: the text inside the box
653 width: the width of the box
654 color: the box's color
659 See also :meth:`print_box`, :meth:`box`.
661 >>> print(preformatted_box('title', 'this\\nis\\nsome\\ntext', width=20).strip())
678 ret += color + '╭' + '─' * w + '╮' + rset + '\n'
679 if title is not None:
684 + justify_string(title, width=w, alignment='c')
690 ret += color + '│' + ' ' * w + '│' + rset + '\n'
692 for line in text.split('\n'):
693 tw = len(string_utils.strip_ansi_sequences(line))
706 ret += color + '╰' + '─' * w + '╯' + rset + '\n'
711 title: Optional[str] = None,
712 text: Optional[str] = None,
717 """Draws a box with nice rounded corners.
720 title: the title of the box
721 text: the text inside the box
722 width: the width of the box
723 color: the box's color
729 Prints a box with your text on the console to sys.stdout.
731 See also :meth:`preformatted_box`, :meth:`box`.
733 >>> print_box('Title', 'This is text', width=30)
734 ╭────────────────────────────╮
738 ╰────────────────────────────╯
740 >>> print_box(None, 'OK', width=6)
745 print(preformatted_box(title, text, width=width, color=color), end='')
748 if __name__ == '__main__':