Source code for basf2.utils

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""
basf2.utils - Helper functions for printing basf2 objects
---------------------------------------------------------

This modules contains some utility functions used by basf2, mainly for printing
things.
"""

import inspect as _inspect
from shutil import get_terminal_size as _get_terminal_size
import textwrap as _textwrap
import pybasf2


[docs]def get_terminal_width(): """ Returns width of terminal in characters, or 80 if unknown. """ return _get_terminal_size(fallback=(80, 24)).columns
[docs]def pretty_print_table(table, column_widths, first_row_is_heading=True, transform=None, min_flexible_width=10, *, hline_formatter=None): """ Pretty print a given table, by using available terminal size and word wrapping fields as needed. Parameters: table: A 2d list of table fields. Each row must have the same length. column_width: list of column widths, needs to be of same length as rows in 'table'. Available fields are ``-n`` as needed, up to n characters, word wrap if longer ``0`` as long as needed, no wrapping ``n`` n characters (fixed) ``*`` use all available space, good for description fields. If more than one column has a * they all get equal width ``+`` use all available space but at least the actual width. Only useful to make the table span the full width of the terminal The column width can also start with ``>``, ``<`` or ``^`` in which case it will be right, left or center aligned. first_row_is_heading: header specifies if we should take the first row as table header and offset it a bit transform: either None or a callback function which takes three arguments 1. the elements of the row as a list 2. second the width of each column (without separator) 3. the preformatted text line. It should return a string representing the final line to be printed. min_flexible_width: the minimum amount of characters for every column marked with * hline_formatter: A callable function to format horizontal lines (above and below the table header). Should be a callback with one parameter for the total width of the table in characters and return a string that is the horizontal line. If None is returned no line is printed. If argument is not given or given as None the default of printing '-' signs are printed over the whole table width is used. .. versionchanged:: after release 5 Added support for column alignment """ # figure out how much space we need for each column (without separators) act_column_widths = [len(cell) for cell in table[0]] for row in table: for (col, cell) in enumerate(row): act_column_widths[col] = max(len(str(cell)), act_column_widths[col]) # adjust act_column_widths to comply with user-specified widths total_used_width = 0 long_columns = [] # index of * column, if found # alignment character of the column following str.format align = [] for (col, opt) in enumerate(column_widths): # check if our column is aligned if isinstance(opt, str) and opt[0] in "<>^": align.append(opt[0]) opt = opt[1:] else: align.append('') # and try to convert option to an int try: opt = int(opt) except ValueError: pass if opt == '*': # handled after other fields are set long_columns.append(col) continue elif opt == "+": # handled after other fields are set. Distinguish from * by using by # using negative indices long_columns.append(- col - 1) continue elif isinstance(opt, int) and opt > 0: # fixed width act_column_widths[col] = opt elif isinstance(opt, int) and opt == 0: # as long as needed, nothing to do pass elif isinstance(opt, int) and opt < 0: # width may be at most 'opt' act_column_widths[col] = min(act_column_widths[col], -opt) else: print('Invalid column_widths option "' + str(opt) + '"') return total_used_width += act_column_widths[col] # add separators total_used_width += len(act_column_widths) - 1 if long_columns: remaining_space = max(get_terminal_width() - total_used_width, len(long_columns) * min_flexible_width) # ok split the table into even parts but divide up the remainder col_width, remainder = divmod(remaining_space, len(long_columns)) for i, col in enumerate(long_columns): size = col_width + (1 if i < remainder else 0) if col < 0: # negative index: a '+' specifier: make column large but at # least as wide as content. So convert column to positive and # set the width col = -1 - col act_column_widths[col] = max(size, act_column_widths[col]) # if we are larger than we should be add the amount to the total # table width total_used_width += act_column_widths[col] - size else: act_column_widths[col] = size total_used_width += remaining_space format_string = ' '.join(['{:%s%d}' % opt for opt in zip(align, act_column_widths[:-1])]) # don't print extra spaces at end of each line unless it's specifically aligned if not align[-1]: format_string += ' {}' else: format_string += ' {:%s%d}' % (align[-1], act_column_widths[-1]) if hline_formatter is not None: hline = hline_formatter(total_used_width) else: hline = total_used_width * "-" # print table if first_row_is_heading and hline is not None: print(hline) header_shown = False for row in table: # use automatic word wrapping on module description (last field) wrapped_row = [_textwrap.wrap(str(row[i]), width) for (i, width) in enumerate(act_column_widths)] max_lines = max([len(col) for col in wrapped_row]) for line in range(max_lines): for (i, cell) in enumerate(row): if line < len(wrapped_row[i]): row[i] = wrapped_row[i][line] else: row[i] = '' line = format_string.format(*row) if transform is not None: line = transform(row, act_column_widths, line) print(line) if not header_shown and first_row_is_heading and hline is not None: print(hline) header_shown = True
[docs]def pretty_print_description_list(rows): """ Given a list of 2-tuples, print a nicely formatted description list. Rows with only one entry are interpreted as sub-headings """ term_width = get_terminal_width() # indentation width module_width = 24 # text wrapper class to format description to terminal width wrapper = _textwrap.TextWrapper(width=term_width, initial_indent="", subsequent_indent=" " * (module_width)) useColors = pybasf2.LogPythonInterface.terminal_supports_colors() def bold(text): """Use ANSI sequence to show string in bold""" if useColors: return '\x1b[1m' + text + '\x1b[0m' return text print('') print(term_width * '-') # loop over all modules for row in rows: if len(row) == 1: subheading = row[0] print('') print(bold(subheading).center(term_width)) else: name, description = row for i, line in enumerate(description.splitlines()): if i == 0: # set indent of the first description line to have enough # space for the module name (at least module_width) and # output a bold module name and the description next to it wrapper.initial_indent = max(module_width, len(name) + 1) * " " print(bold(name.ljust(module_width - 1)), wrapper.fill(line).lstrip()) else: # not first line anymore, no module name in front so initial # indent is equal to subsequent indent wrapper.initial_indent = wrapper.subsequent_indent print(wrapper.fill(line)) print(term_width * '-') print('')
[docs]def is_mod_function(mod, func): """Return true if ``func`` is a function and defined in the module ``mod``""" return _inspect.isfunction(func) and _inspect.getmodule(func) == mod
[docs]def list_functions(mod): """ Returns list of function names defined in the given Python module. """ return [func.__name__ for func in mod.__dict__.values() if is_mod_function(mod, func)]
[docs]def pretty_print_module(module, module_name, replacements={}): """Pretty print the contents of a python module. It will print all the functions defined in the given module to the console Arguments: module: instance of the module or name with which it can be found in `sys.modules` module_name: readable module name replacements (dict): dictionary containing text replacements: Every occurrence of any key in the function signature will be replaced by its value """ from terminal_utils import Pager desc_list = [] # allow mod to be just the name of the module if isinstance(module, str): import sys module = sys.modules[module] for function_name in sorted(list_functions(module), key=lambda x: x.lower()): function = getattr(module, function_name) signature = _inspect.formatargspec(*_inspect.getfullargspec(function)) for key, value in replacements.items(): signature = signature.replace(key, value) desc_list.append((function.__name__, signature + '\n' + function.__doc__)) with Pager('List of available functions in ' + module_name, True): pretty_print_description_list(desc_list)