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term.py
# Copyright (C) 2013-2014 Red Hat, Inc. # Terminal routines. # # This copyrighted material is made available to anyone wishing to use, # modify, copy, or redistribute it subject to the terms and conditions of # the GNU General Public License v.2, or (at your option) any later version. # This program is distributed in the hope that it will be useful, but WITHOUT # ANY WARRANTY expressed or implied, including the implied warranties of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General # Public License for more details. You should have received a copy of the # GNU General Public License along with this program; if not, write to the # Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA # 02110-1301, USA. Any Red Hat trademarks that are incorporated in the # source code or documentation are not subject to the GNU General Public # License and may only be used or replicated with the express permission of # Red Hat, Inc. # from __future__ import absolute_import from __future__ import unicode_literals import curses import dnf.pycomp import fcntl import re import struct import sys import termios def _real_term_width(fd=1): """ Get the real terminal width """ try: buf = 'abcdefgh' buf = fcntl.ioctl(fd, termios.TIOCGWINSZ, buf) ret = struct.unpack(b'hhhh', buf)[1] return ret except IOError: return None def _term_width(fd=1): """ Compute terminal width falling to default 80 in case of trouble""" tw = _real_term_width(fd=1) if not tw: return 80 elif tw < 20: return 20 else: return tw class Term(object): """A class to provide some terminal "UI" helpers based on curses.""" # From initial search for "terminfo and python" got: # http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/475116 # ...it's probably not copyrightable, but if so ASPN says: # # Except where otherwise noted, recipes in the Python Cookbook are # published under the Python license. __enabled = True real_columns = property(lambda self: _real_term_width()) columns = property(lambda self: _term_width()) __cap_names = { 'underline' : 'smul', 'reverse' : 'rev', 'normal' : 'sgr0', } __colors = { 'black' : 0, 'blue' : 1, 'green' : 2, 'cyan' : 3, 'red' : 4, 'magenta' : 5, 'yellow' : 6, 'white' : 7 } __ansi_colors = { 'black' : 0, 'red' : 1, 'green' : 2, 'yellow' : 3, 'blue' : 4, 'magenta' : 5, 'cyan' : 6, 'white' : 7 } __ansi_forced_MODE = { 'bold' : '\x1b[1m', 'blink' : '\x1b[5m', 'dim' : '', 'reverse' : '\x1b[7m', 'underline' : '\x1b[4m', 'normal' : '\x1b(B\x1b[m' } __ansi_forced_FG_COLOR = { 'black' : '\x1b[30m', 'red' : '\x1b[31m', 'green' : '\x1b[32m', 'yellow' : '\x1b[33m', 'blue' : '\x1b[34m', 'magenta' : '\x1b[35m', 'cyan' : '\x1b[36m', 'white' : '\x1b[37m' } __ansi_forced_BG_COLOR = { 'black' : '\x1b[40m', 'red' : '\x1b[41m', 'green' : '\x1b[42m', 'yellow' : '\x1b[43m', 'blue' : '\x1b[44m', 'magenta' : '\x1b[45m', 'cyan' : '\x1b[46m', 'white' : '\x1b[47m' } def __forced_init(self): self.MODE = self.__ansi_forced_MODE self.FG_COLOR = self.__ansi_forced_FG_COLOR self.BG_COLOR = self.__ansi_forced_BG_COLOR def reinit(self, term_stream=None, color='auto'): """Reinitializes the :class:`Term`. :param term_stream: the terminal stream that the :class:`Term` should be initialized to use. If *term_stream* is not given, :attr:`sys.stdout` is used. :param color: when to colorize output. Valid values are 'always', 'auto', and 'never'. 'always' will use ANSI codes to always colorize output, 'auto' will decide whether do colorize depending on the terminal, and 'never' will never colorize. """ self.__enabled = True self.lines = 24 if color == 'always': self.__forced_init() return # Output modes: self.MODE = { 'bold' : '', 'blink' : '', 'dim' : '', 'reverse' : '', 'underline' : '', 'normal' : '' } # Colours self.FG_COLOR = { 'black' : '', 'blue' : '', 'green' : '', 'cyan' : '', 'red' : '', 'magenta' : '', 'yellow' : '', 'white' : '' } self.BG_COLOR = { 'black' : '', 'blue' : '', 'green' : '', 'cyan' : '', 'red' : '', 'magenta' : '', 'yellow' : '', 'white' : '' } if color == 'never': self.__enabled = False return assert color == 'auto' # If the stream isn't a tty, then assume it has no capabilities. if not term_stream: term_stream = sys.stdout if not term_stream.isatty(): self.__enabled = False return # Check the terminal type. If we fail, then assume that the # terminal has no capabilities. try: curses.setupterm(fd=term_stream.fileno()) except Exception: self.__enabled = False return self._ctigetstr = curses.tigetstr self.lines = curses.tigetnum('lines') # Look up string capabilities. for cap_name in self.MODE: mode = cap_name if cap_name in self.__cap_names: cap_name = self.__cap_names[cap_name] self.MODE[mode] = self._tigetstr(cap_name) # Colors set_fg = self._tigetstr('setf').encode('utf-8') if set_fg: for (color, val) in self.__colors.items(): self.FG_COLOR[color] = curses.tparm(set_fg, val).decode() or '' set_fg_ansi = self._tigetstr('setaf').encode('utf-8') if set_fg_ansi: for (color, val) in self.__ansi_colors.items(): fg_color = curses.tparm(set_fg_ansi, val).decode() or '' self.FG_COLOR[color] = fg_color set_bg = self._tigetstr('setb').encode('utf-8') if set_bg: for (color, val) in self.__colors.items(): self.BG_COLOR[color] = curses.tparm(set_bg, val).decode() or '' set_bg_ansi = self._tigetstr('setab').encode('utf-8') if set_bg_ansi: for (color, val) in self.__ansi_colors.items(): bg_color = curses.tparm(set_bg_ansi, val).decode() or '' self.BG_COLOR[color] = bg_color def __init__(self, term_stream=None, color='auto'): self.reinit(term_stream, color) def _tigetstr(self, cap_name): # String capabilities can include "delays" of the form "$<2>". # For any modern terminal, we should be able to just ignore # these, so strip them out. cap = self._ctigetstr(cap_name) or '' if dnf.pycomp.is_py3bytes(cap): cap = cap.decode() return re.sub(r'\$<\d+>[/*]?', '', cap) def color(self, color, s): """Colorize string with color""" return (self.MODE[color] + str(s) + self.MODE['normal']) def bold(self, s): """Make string bold.""" return self.color('bold', s) def sub(self, haystack, beg, end, needles, escape=None, ignore_case=False): """Search the string *haystack* for all occurrences of any string in the list *needles*. Prefix each occurrence with *beg*, and postfix each occurrence with *end*, then return the modified string. For example:: >>> yt = Term() >>> yt.sub('spam and eggs', 'x', 'z', ['and']) 'spam xandz eggs' This is particularly useful for emphasizing certain words in output: for example, calling :func:`sub` with *beg* = MODE['bold'] and *end* = MODE['normal'] will return a string that when printed to the terminal will appear to be *haystack* with each occurrence of the strings in *needles* in bold face. Note, however, that the :func:`sub_mode`, :func:`sub_bold`, :func:`sub_fg`, and :func:`sub_bg` methods provide convenient ways to access this same emphasizing functionality. :param haystack: the string to be modified :param beg: the string to be prefixed onto matches :param end: the string to be postfixed onto matches :param needles: a list of strings to add the prefixes and postfixes to :param escape: a function that accepts a string and returns the same string with problematic characters escaped. By default, :func:`re.escape` is used. :param ignore_case: whether case should be ignored when searching for matches :return: *haystack* with *beg* prefixing, and *end* postfixing, occurrences of the strings in *needles* """ if not self.__enabled: return haystack if not escape: escape = re.escape render = lambda match: beg + match.group() + end for needle in needles: pat = escape(needle) if ignore_case: pat = re.template(pat, re.I) haystack = re.sub(pat, render, haystack) return haystack def sub_norm(self, haystack, beg, needles, **kwds): """Search the string *haystack* for all occurrences of any string in the list *needles*. Prefix each occurrence with *beg*, and postfix each occurrence with self.MODE['normal'], then return the modified string. If *beg* is an ANSI escape code, such as given by self.MODE['bold'], this method will return *haystack* with the formatting given by the code only applied to the strings in *needles*. :param haystack: the string to be modified :param beg: the string to be prefixed onto matches :param end: the string to be postfixed onto matches :param needles: a list of strings to add the prefixes and postfixes to :return: *haystack* with *beg* prefixing, and self.MODE['normal'] postfixing, occurrences of the strings in *needles* """ return self.sub(haystack, beg, self.MODE['normal'], needles, **kwds) def sub_mode(self, haystack, mode, needles, **kwds): """Search the string *haystack* for all occurrences of any string in the list *needles*. Prefix each occurrence with self.MODE[*mode*], and postfix each occurrence with self.MODE['normal'], then return the modified string. This will return a string that when printed to the terminal will appear to be *haystack* with each occurrence of the strings in *needles* in the given *mode*. :param haystack: the string to be modified :param mode: the mode to set the matches to be in. Valid values are given by self.MODE.keys(). :param needles: a list of strings to add the prefixes and postfixes to :return: *haystack* with self.MODE[*mode*] prefixing, and self.MODE['normal'] postfixing, occurrences of the strings in *needles* """ return self.sub_norm(haystack, self.MODE[mode], needles, **kwds) def sub_bold(self, haystack, needles, **kwds): """Search the string *haystack* for all occurrences of any string in the list *needles*. Prefix each occurrence with self.MODE['bold'], and postfix each occurrence with self.MODE['normal'], then return the modified string. This will return a string that when printed to the terminal will appear to be *haystack* with each occurrence of the strings in *needles* in bold face. :param haystack: the string to be modified :param needles: a list of strings to add the prefixes and postfixes to :return: *haystack* with self.MODE['bold'] prefixing, and self.MODE['normal'] postfixing, occurrences of the strings in *needles* """ return self.sub_mode(haystack, 'bold', needles, **kwds) def sub_fg(self, haystack, color, needles, **kwds): """Search the string *haystack* for all occurrences of any string in the list *needles*. Prefix each occurrence with self.FG_COLOR[*color*], and postfix each occurrence with self.MODE['normal'], then return the modified string. This will return a string that when printed to the terminal will appear to be *haystack* with each occurrence of the strings in *needles* in the given color. :param haystack: the string to be modified :param color: the color to set the matches to be in. Valid values are given by self.FG_COLOR.keys(). :param needles: a list of strings to add the prefixes and postfixes to :return: *haystack* with self.FG_COLOR[*color*] prefixing, and self.MODE['normal'] postfixing, occurrences of the strings in *needles* """ return self.sub_norm(haystack, self.FG_COLOR[color], needles, **kwds) def sub_bg(self, haystack, color, needles, **kwds): """Search the string *haystack* for all occurrences of any string in the list *needles*. Prefix each occurrence with self.BG_COLOR[*color*], and postfix each occurrence with self.MODE['normal'], then return the modified string. This will return a string that when printed to the terminal will appear to be *haystack* with each occurrence of the strings in *needles* highlighted in the given background color. :param haystack: the string to be modified :param color: the background color to set the matches to be in. Valid values are given by self.BG_COLOR.keys(). :param needles: a list of strings to add the prefixes and postfixes to :return: *haystack* with self.BG_COLOR[*color*] prefixing, and self.MODE['normal'] postfixing, occurrences of the strings in *needles* """ return self.sub_norm(haystack, self.BG_COLOR[color], needles, **kwds)
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