X-Git-Url: https://wannabe.guru.org/gitweb/?a=blobdiff_plain;f=text_utils.py;h=39b8fe3e3db64266aeaeaad4d92503be393017e9;hb=e46158e49121b8a955bb07b73f5bcf9928b79c90;hp=b42661959021c42180986f1f4e6dbaa93592a516;hpb=e11d9b0958b2874bd67360552e9214d965fe0d12;p=python_utils.git diff --git a/text_utils.py b/text_utils.py index b426619..39b8fe3 100644 --- a/text_utils.py +++ b/text_utils.py @@ -6,8 +6,10 @@ """Utilities for dealing with "text".""" import contextlib +import enum import logging import math +import os import re import sys from collections import defaultdict @@ -25,42 +27,101 @@ class RowsColumns: """Row + Column""" rows: int = 0 + """Numer of rows""" + columns: int = 0 + """Number of columns""" def get_console_rows_columns() -> RowsColumns: - """Returns the number of rows/columns on the current console.""" - + """ + Returns: + The number of rows/columns on the current console or None + if we can't tell or an error occurred. + """ from exec_utils import cmd - try: - rows, columns = cmd( - "stty size", - timeout_seconds=1.0, - ).split() - except Exception as e: - logger.exception(e) - raise Exception('Can\'t determine console size?!') from e - return RowsColumns(int(rows), int(columns)) + rows: Optional[str] = os.environ.get('LINES', None) + cols: Optional[str] = os.environ.get('COLUMNS', None) + if not rows or not cols: + logger.debug('Rows: %s, cols: %s, trying stty.', rows, cols) + try: + rows, cols = cmd( + "stty size", + timeout_seconds=1.0, + ).split() + except Exception: + rows = None + cols = None + + if rows is None: + logger.debug('Rows: %s, cols: %s, tput rows.', rows, cols) + try: + rows = cmd( + "tput rows", + timeout_seconds=1.0, + ) + except Exception: + rows = None + + if cols is None: + logger.debug('Rows: %s, cols: %s, tput cols.', rows, cols) + try: + cols = cmd( + "tput cols", + timeout_seconds=1.0, + ) + except Exception: + cols = None + + if not rows or not cols: + raise Exception('Can\'t determine console size?!') + return RowsColumns(int(rows), int(cols)) + + +class BarGraphText(enum.Enum): + """What kind of text to include at the end of the bar graph?""" + + NONE = (0,) + """None, leave it blank.""" + + PERCENTAGE = (1,) + """XX.X%""" + + FRACTION = (2,) + """N / K""" -def progress_graph( +def bar_graph( current: int, total: int, *, width=70, + text: BarGraphText = BarGraphText.PERCENTAGE, fgcolor=fg("school bus yellow"), left_end="[", right_end="]", redraw=True, ) -> None: - """Draws a progress graph.""" - - percent = current / total + """Draws a progress graph at the current cursor position. + + Args: + current: how many have we done so far? + total: how many are there to do total? + text: how should we render the text at the end? + width: how many columns wide should be progress graph be? + fgcolor: what color should "done" part of the graph be? + left_end: the character at the left side of the graph + right_end: the character at the right side of the graph + redraw: if True, omit a line feed after the carriage return + so that subsequent calls to this method redraw the graph + iteratively. + """ ret = "\r" if redraw else "\n" - bar = bar_graph( - percent, - include_text=True, + bar = bar_graph_string( + current, + total, + text=text, width=width, fgcolor=fgcolor, left_end=left_end, @@ -69,10 +130,21 @@ def progress_graph( print(bar, end=ret, flush=True, file=sys.stderr) -def bar_graph( - percentage: float, +def _make_bar_graph_text(text: BarGraphText, current: int, total: int, percentage: float): + if text == BarGraphText.NONE: + return "" + elif text == BarGraphText.PERCENTAGE: + return f'{percentage:.1f}' + elif text == BarGraphText.FRACTION: + return f'{current} / {total}' + raise ValueError(text) + + +def bar_graph_string( + current: int, + total: int, *, - include_text=True, + text: BarGraphText = BarGraphText.PERCENTAGE, width=70, fgcolor=fg("school bus yellow"), reset_seq=reset(), @@ -81,17 +153,28 @@ def bar_graph( ) -> str: """Returns a string containing a bar graph. - >>> bar_graph(0.5, fgcolor='', reset_seq='') + Args: + current: how many have we done so far? + total: how many are there to do total? + text: how should we render the text at the end? + width: how many columns wide should be progress graph be? + fgcolor: what color should "done" part of the graph be? + reset_seq: sequence to use to turn off color + left_end: the character at the left side of the graph + right_end: the character at the right side of the graph + + >>> bar_graph(5, 10, fgcolor='', reset_seq='') '[███████████████████████████████████ ] 50.0%' """ + if total != 0: + percentage = float(current) / float(total) + else: + percentage = 0.0 if percentage < 0.0 or percentage > 1.0: raise ValueError(percentage) - if include_text: - text = f"{percentage*100.0:2.1f}%" - else: - text = "" + text = _make_bar_graph_text(text, current, total, percentage) whole_width = math.floor(percentage * width) if whole_width == width: whole_width -= 1 @@ -119,6 +202,16 @@ def sparkline(numbers: List[float]) -> Tuple[float, float, str]: """ Makes a "sparkline" little inline histogram graph. Auto scales. + Args: + numbers: the population over which to create the sparkline + + Returns: + a three tuple containing: + + * the minimum number in the population + * the maximum number in the population + * a string representation of the population in a concise format + >>> sparkline([1, 2, 3, 5, 10, 3, 5, 7]) (1, 10, '▁▁▂▄█▂▄▆') @@ -146,9 +239,16 @@ def distribute_strings( """ Distributes strings into a line for justified text. + Args: + strings: a list of string tokens to distribute + width: the width of the line to create + padding: the padding character to place between string chunks + + Returns: + The distributed, justified string. + >>> distribute_strings(['this', 'is', 'a', 'test'], width=40) ' this is a test ' - """ ret = ' ' + ' '.join(strings) + ' ' assert len(string_utils.strip_ansi_sequences(ret)) < width @@ -165,13 +265,21 @@ def distribute_strings( return ret -def justify_string_by_chunk(string: str, width: int = 80, padding: str = " ") -> str: +def _justify_string_by_chunk(string: str, width: int = 80, padding: str = " ") -> str: """ - Justifies a string. + Justifies a string chunk by chunk. - >>> justify_string_by_chunk("This is a test", 40) + Args: + string: the string to be justified + width: how wide to make the output + padding: what padding character to use between chunks + + Returns: + the justified string + + >>> _justify_string_by_chunk("This is a test", 40) 'This is a test' - >>> justify_string_by_chunk("This is a test", 20) + >>> _justify_string_by_chunk("This is a test", 20) 'This is a test' """ @@ -188,7 +296,18 @@ def justify_string_by_chunk(string: str, width: int = 80, padding: str = " ") -> def justify_string( string: str, *, width: int = 80, alignment: str = "c", padding: str = " " ) -> str: - """Justify a string. + """Justify a string to width with left, right, center of justified + alignment. + + Args: + string: the string to justify + width: the width to justify the string to + alignment: a single character indicating the desired alignment: + * 'c' = centered within the width + * 'j' = justified at width + * 'l' = left alignment + * 'r' = right alignment + padding: the padding character to use while justifying >>> justify_string('This is another test', width=40, alignment='c') ' This is another test ' @@ -198,7 +317,6 @@ def justify_string( ' This is another test' >>> justify_string('This is another test', width=40, alignment='j') 'This is another test' - """ alignment = alignment[0] padding = padding[0] @@ -208,7 +326,7 @@ def justify_string( elif alignment == "r": string = padding + string elif alignment == "j": - return justify_string_by_chunk(string, width=width, padding=padding) + return _justify_string_by_chunk(string, width=width, padding=padding) elif alignment == "c": if len(string) % 2 == 0: string += padding @@ -220,8 +338,21 @@ def justify_string( def justify_text(text: str, *, width: int = 80, alignment: str = "c", indent_by: int = 0) -> str: - """ - Justifies text optionally with initial indentation. + """Justifies text with left, right, centered or justified alignment + and optionally with initial indentation. + + Args: + text: the text to be justified + width: the width at which to justify text + alignment: a single character indicating the desired alignment: + * 'c' = centered within the width + * 'j' = justified at width + * 'l' = left alignment + * 'r' = right alignment + indent_by: if non-zero, adds n prefix spaces to indent the text. + + Returns: + The justified text. >>> justify_text('This is a test of the emergency broadcast system. This is only a test.', ... width=40, alignment='j') #doctest: +NORMALIZE_WHITESPACE @@ -253,6 +384,26 @@ def justify_text(text: str, *, width: int = 80, alignment: str = "c", indent_by: def generate_padded_columns(text: List[str]) -> Generator: + """Given a list of strings, break them into columns using :meth:`split` + and then compute the maximum width of each column. Finally, + distribute the columular chunks into the output padding each to + the proper width. + + Args: + text: a list of strings to chunk into padded columns + + Returns: + padded columns based on text.split() + + >>> for x in generate_padded_columns( + ... [ 'reading writing arithmetic', + ... 'mathematics psychology physics', + ... 'communications sociology anthropology' ]): + ... print(x.strip()) + reading writing arithmetic + mathematics psychology physics + communications sociology anthropology + """ max_width: Dict[int, int] = defaultdict(int) for line in text: for pos, word in enumerate(line.split()): @@ -268,6 +419,14 @@ def generate_padded_columns(text: List[str]) -> Generator: def wrap_string(text: str, n: int) -> str: + """ + Args: + text: the string to be wrapped + n: the width after which to wrap text + + Returns: + The wrapped form of text + """ chunks = text.split() out = '' width = 0 @@ -282,13 +441,20 @@ def wrap_string(text: str, n: int) -> str: class Indenter(contextlib.AbstractContextManager): """ - with Indenter(pad_count = 8) as i: - i.print('test') - with i: - i.print('-ing') + Context manager that indents stuff (even recursively). e.g.:: + + with Indenter(pad_count = 8) as i: + i.print('test') with i: - i.print('1, 2, 3') + i.print('-ing') + with i: + i.print('1, 2, 3') + + Yields:: + test + -ing + 1, 2, 3 """ def __init__( @@ -298,6 +464,13 @@ class Indenter(contextlib.AbstractContextManager): pad_char: str = ' ', pad_count: int = 4, ): + """Construct an Indenter. + + Args: + pad_prefix: an optional prefix to prepend to each line + pad_char: the character used to indent + pad_count: the number of pad_chars to use to indent + """ self.level = -1 if pad_prefix is not None: self.pad_prefix = pad_prefix @@ -326,16 +499,28 @@ def header( width: Optional[int] = None, align: Optional[str] = None, style: Optional[str] = 'solid', + color: Optional[str] = None, ): """ - Returns a nice header line with a title. + Creates a nice header line with a title. + + Args: + title: the title + width: how wide to make the header + align: "left" or "right" + style: "ascii", "solid" or "dashed" + + Returns: + The header as a string. >>> header('title', width=60, style='ascii') '----[ title ]-----------------------------------------------' - """ if not width: - width = get_console_rows_columns().columns + try: + width = get_console_rows_columns().columns + except Exception: + width = 80 if not align: align = 'left' if not style: @@ -366,12 +551,38 @@ def header( line_char = '-' begin = '[' end = ']' - return line_char * left + begin + ' ' + title + ' ' + end + line_char * right + if color: + col = color + reset_seq = reset() + else: + col = '' + reset_seq = '' + return line_char * left + begin + col + ' ' + title + ' ' + reset_seq + end + line_char * right def box( title: Optional[str] = None, text: Optional[str] = None, *, width: int = 80, color: str = '' ) -> str: + """ + Make a nice unicode box (optionally with color) around some text. + + Args: + title: the title of the box + text: the text in the box + width: the box's width + color: the box's color + + Returns: + the box as a string + + >>> print(box('title', 'this is some text', width=20).strip()) + ╭──────────────────╮ + │ title │ + │ │ + │ this is some │ + │ text │ + ╰──────────────────╯ + """ assert width > 4 if text is not None: text = justify_text(text, width=width - 4, alignment='l') @@ -381,6 +592,27 @@ def box( def preformatted_box( title: Optional[str] = None, text: Optional[str] = None, *, width=80, color: str = '' ) -> str: + """Creates a nice box with rounded corners and returns it as a string. + + Args: + title: the title of the box + text: the text inside the box + width: the width of the box + color: the box's color + + Returns: + the box as a string + + >>> print(preformatted_box('title', 'this\\nis\\nsome\\ntext', width=20).strip()) + ╭──────────────────╮ + │ title │ + │ │ + │ this │ + │ is │ + │ some │ + │ text │ + ╰──────────────────╯ + """ assert width > 4 ret = '' if color == '': @@ -426,9 +658,8 @@ def print_box( ╭────╮ │ OK │ ╰────╯ - """ - print(box(title, text, width=width, color=color), end='') + print(preformatted_box(title, text, width=width, color=color), end='') if __name__ == '__main__':