forked from beetbox/beets
/
__init__.py
1257 lines (1047 loc) · 41 KB
/
__init__.py
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# -*- coding: utf-8 -*-
# This file is part of beets.
# Copyright 2016, Adrian Sampson.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
"""This module contains all of the core logic for beets' command-line
interface. To invoke the CLI, just call beets.ui.main(). The actual
CLI commands are implemented in the ui.commands module.
"""
from __future__ import division, absolute_import, print_function
import optparse
import textwrap
import sys
from difflib import SequenceMatcher
import sqlite3
import errno
import re
import struct
import traceback
import os.path
from six.moves import input
from beets import logging
from beets import library
from beets import plugins
from beets import util
from beets.util.functemplate import Template
from beets import config
from beets.util import confit, as_string
from beets.autotag import mb
from beets.dbcore import query as db_query
from beets.dbcore import db
import six
# On Windows platforms, use colorama to support "ANSI" terminal colors.
if sys.platform == 'win32':
try:
import colorama
except ImportError:
pass
else:
colorama.init()
log = logging.getLogger('beets')
if not log.handlers:
log.addHandler(logging.StreamHandler())
log.propagate = False # Don't propagate to root handler.
PF_KEY_QUERIES = {
'comp': u'comp:true',
'singleton': u'singleton:true',
}
class UserError(Exception):
"""UI exception. Commands should throw this in order to display
nonrecoverable errors to the user.
"""
# Encoding utilities.
def _in_encoding():
"""Get the encoding to use for *inputting* strings from the console.
"""
return _stream_encoding(sys.stdin)
def _out_encoding():
"""Get the encoding to use for *outputting* strings to the console.
"""
return _stream_encoding(sys.stdout)
def _stream_encoding(stream, default='utf-8'):
"""A helper for `_in_encoding` and `_out_encoding`: get the stream's
preferred encoding, using a configured override or a default
fallback if neither is not specified.
"""
# Configured override?
encoding = config['terminal_encoding'].get()
if encoding:
return encoding
# For testing: When sys.stdout or sys.stdin is a StringIO under the
# test harness, it doesn't have an `encoding` attribute. Just use
# UTF-8.
if not hasattr(stream, 'encoding'):
return default
# Python's guessed output stream encoding, or UTF-8 as a fallback
# (e.g., when piped to a file).
return stream.encoding or default
def decargs(arglist):
"""Given a list of command-line argument bytestrings, attempts to
decode them to Unicode strings when running under Python 2.
"""
if six.PY2:
return [s.decode(util.arg_encoding()) for s in arglist]
else:
return arglist
def print_(*strings, **kwargs):
"""Like print, but rather than raising an error when a character
is not in the terminal's encoding's character set, just silently
replaces it.
The arguments must be Unicode strings: `unicode` on Python 2; `str` on
Python 3.
The `end` keyword argument behaves similarly to the built-in `print`
(it defaults to a newline).
"""
if not strings:
strings = [u'']
assert isinstance(strings[0], six.text_type)
txt = u' '.join(strings)
txt += kwargs.get('end', u'\n')
# Encode the string and write it to stdout.
if six.PY2:
# On Python 2, sys.stdout expects bytes.
out = txt.encode(_out_encoding(), 'replace')
sys.stdout.write(out)
else:
# On Python 3, sys.stdout expects text strings and uses the
# exception-throwing encoding error policy. To avoid throwing
# errors and use our configurable encoding override, we use the
# underlying bytes buffer instead.
if hasattr(sys.stdout, 'buffer'):
out = txt.encode(_out_encoding(), 'replace')
sys.stdout.buffer.write(out)
sys.stdout.buffer.flush()
else:
# In our test harnesses (e.g., DummyOut), sys.stdout.buffer
# does not exist. We instead just record the text string.
sys.stdout.write(txt)
# Configuration wrappers.
def _bool_fallback(a, b):
"""Given a boolean or None, return the original value or a fallback.
"""
if a is None:
assert isinstance(b, bool)
return b
else:
assert isinstance(a, bool)
return a
def should_write(write_opt=None):
"""Decide whether a command that updates metadata should also write
tags, using the importer configuration as the default.
"""
return _bool_fallback(write_opt, config['import']['write'].get(bool))
def should_move(move_opt=None):
"""Decide whether a command that updates metadata should also move
files when they're inside the library, using the importer
configuration as the default.
Specifically, commands should move files after metadata updates only
when the importer is configured *either* to move *or* to copy files.
They should avoid moving files when the importer is configured not
to touch any filenames.
"""
return _bool_fallback(
move_opt,
config['import']['move'].get(bool) or
config['import']['copy'].get(bool)
)
# Input prompts.
def input_(prompt=None):
"""Like `input`, but decodes the result to a Unicode string.
Raises a UserError if stdin is not available. The prompt is sent to
stdout rather than stderr. A printed between the prompt and the
input cursor.
"""
# raw_input incorrectly sends prompts to stderr, not stdout, so we
# use print_() explicitly to display prompts.
# http://bugs.python.org/issue1927
if prompt:
print_(prompt, end=u' ')
try:
resp = input()
except EOFError:
raise UserError(u'stdin stream ended while input required')
if six.PY2:
return resp.decode(_in_encoding(), 'ignore')
else:
return resp
def input_options(options, require=False, prompt=None, fallback_prompt=None,
numrange=None, default=None, max_width=72):
"""Prompts a user for input. The sequence of `options` defines the
choices the user has. A single-letter shortcut is inferred for each
option; the user's choice is returned as that single, lower-case
letter. The options should be provided as lower-case strings unless
a particular shortcut is desired; in that case, only that letter
should be capitalized.
By default, the first option is the default. `default` can be provided to
override this. If `require` is provided, then there is no default. The
prompt and fallback prompt are also inferred but can be overridden.
If numrange is provided, it is a pair of `(high, low)` (both ints)
indicating that, in addition to `options`, the user may enter an
integer in that inclusive range.
`max_width` specifies the maximum number of columns in the
automatically generated prompt string.
"""
# Assign single letters to each option. Also capitalize the options
# to indicate the letter.
letters = {}
display_letters = []
capitalized = []
first = True
for option in options:
# Is a letter already capitalized?
for letter in option:
if letter.isalpha() and letter.upper() == letter:
found_letter = letter
break
else:
# Infer a letter.
for letter in option:
if not letter.isalpha():
continue # Don't use punctuation.
if letter not in letters:
found_letter = letter
break
else:
raise ValueError(u'no unambiguous lettering found')
letters[found_letter.lower()] = option
index = option.index(found_letter)
# Mark the option's shortcut letter for display.
if not require and (
(default is None and not numrange and first) or
(isinstance(default, six.string_types) and
found_letter.lower() == default.lower())):
# The first option is the default; mark it.
show_letter = '[%s]' % found_letter.upper()
is_default = True
else:
show_letter = found_letter.upper()
is_default = False
# Colorize the letter shortcut.
show_letter = colorize('action_default' if is_default else 'action',
show_letter)
# Insert the highlighted letter back into the word.
capitalized.append(
option[:index] + show_letter + option[index + 1:]
)
display_letters.append(found_letter.upper())
first = False
# The default is just the first option if unspecified.
if require:
default = None
elif default is None:
if numrange:
default = numrange[0]
else:
default = display_letters[0].lower()
# Make a prompt if one is not provided.
if not prompt:
prompt_parts = []
prompt_part_lengths = []
if numrange:
if isinstance(default, int):
default_name = six.text_type(default)
default_name = colorize('action_default', default_name)
tmpl = '# selection (default %s)'
prompt_parts.append(tmpl % default_name)
prompt_part_lengths.append(len(tmpl % six.text_type(default)))
else:
prompt_parts.append('# selection')
prompt_part_lengths.append(len(prompt_parts[-1]))
prompt_parts += capitalized
prompt_part_lengths += [len(s) for s in options]
# Wrap the query text.
prompt = ''
line_length = 0
for i, (part, length) in enumerate(zip(prompt_parts,
prompt_part_lengths)):
# Add punctuation.
if i == len(prompt_parts) - 1:
part += '?'
else:
part += ','
length += 1
# Choose either the current line or the beginning of the next.
if line_length + length + 1 > max_width:
prompt += '\n'
line_length = 0
if line_length != 0:
# Not the beginning of the line; need a space.
part = ' ' + part
length += 1
prompt += part
line_length += length
# Make a fallback prompt too. This is displayed if the user enters
# something that is not recognized.
if not fallback_prompt:
fallback_prompt = u'Enter one of '
if numrange:
fallback_prompt += u'%i-%i, ' % numrange
fallback_prompt += ', '.join(display_letters) + ':'
resp = input_(prompt)
while True:
resp = resp.strip().lower()
# Try default option.
if default is not None and not resp:
resp = default
# Try an integer input if available.
if numrange:
try:
resp = int(resp)
except ValueError:
pass
else:
low, high = numrange
if low <= resp <= high:
return resp
else:
resp = None
# Try a normal letter input.
if resp:
resp = resp[0]
if resp in letters:
return resp
# Prompt for new input.
resp = input_(fallback_prompt)
def input_yn(prompt, require=False):
"""Prompts the user for a "yes" or "no" response. The default is
"yes" unless `require` is `True`, in which case there is no default.
"""
sel = input_options(
('y', 'n'), require, prompt, u'Enter Y or N:'
)
return sel == u'y'
def input_select_objects(prompt, objs, rep):
"""Prompt to user to choose all, none, or some of the given objects.
Return the list of selected objects.
`prompt` is the prompt string to use for each question (it should be
phrased as an imperative verb). `rep` is a function to call on each
object to print it out when confirming objects individually.
"""
choice = input_options(
(u'y', u'n', u's'), False,
u'%s? (Yes/no/select)' % prompt)
print() # Blank line.
if choice == u'y': # Yes.
return objs
elif choice == u's': # Select.
out = []
for obj in objs:
rep(obj)
if input_yn(u'%s? (yes/no)' % prompt, True):
out.append(obj)
print() # go to a new line
return out
else: # No.
return []
# Human output formatting.
def human_bytes(size):
"""Formats size, a number of bytes, in a human-readable way."""
powers = [u'', u'K', u'M', u'G', u'T', u'P', u'E', u'Z', u'Y', u'H']
unit = 'B'
for power in powers:
if size < 1024:
return u"%3.1f %s%s" % (size, power, unit)
size /= 1024.0
unit = u'iB'
return u"big"
def human_seconds(interval):
"""Formats interval, a number of seconds, as a human-readable time
interval using English words.
"""
units = [
(1, u'second'),
(60, u'minute'),
(60, u'hour'),
(24, u'day'),
(7, u'week'),
(52, u'year'),
(10, u'decade'),
]
for i in range(len(units) - 1):
increment, suffix = units[i]
next_increment, _ = units[i + 1]
interval /= float(increment)
if interval < next_increment:
break
else:
# Last unit.
increment, suffix = units[-1]
interval /= float(increment)
return u"%3.1f %ss" % (interval, suffix)
def human_seconds_short(interval):
"""Formats a number of seconds as a short human-readable M:SS
string.
"""
interval = int(interval)
return u'%i:%02i' % (interval // 60, interval % 60)
# Colorization.
# ANSI terminal colorization code heavily inspired by pygments:
# http://dev.pocoo.org/hg/pygments-main/file/b2deea5b5030/pygments/console.py
# (pygments is by Tim Hatch, Armin Ronacher, et al.)
COLOR_ESCAPE = "\x1b["
DARK_COLORS = {
"black": 0,
"darkred": 1,
"darkgreen": 2,
"brown": 3,
"darkyellow": 3,
"darkblue": 4,
"purple": 5,
"darkmagenta": 5,
"teal": 6,
"darkcyan": 6,
"lightgray": 7
}
LIGHT_COLORS = {
"darkgray": 0,
"red": 1,
"green": 2,
"yellow": 3,
"blue": 4,
"fuchsia": 5,
"magenta": 5,
"turquoise": 6,
"cyan": 6,
"white": 7
}
RESET_COLOR = COLOR_ESCAPE + "39;49;00m"
# These abstract COLOR_NAMES are lazily mapped on to the actual color in COLORS
# as they are defined in the configuration files, see function: colorize
COLOR_NAMES = ['text_success', 'text_warning', 'text_error', 'text_highlight',
'text_highlight_minor', 'action_default', 'action']
COLORS = None
def _colorize(color, text):
"""Returns a string that prints the given text in the given color
in a terminal that is ANSI color-aware. The color must be something
in DARK_COLORS or LIGHT_COLORS.
"""
if color in DARK_COLORS:
escape = COLOR_ESCAPE + "%im" % (DARK_COLORS[color] + 30)
elif color in LIGHT_COLORS:
escape = COLOR_ESCAPE + "%i;01m" % (LIGHT_COLORS[color] + 30)
else:
raise ValueError(u'no such color %s', color)
return escape + text + RESET_COLOR
def colorize(color_name, text):
"""Colorize text if colored output is enabled. (Like _colorize but
conditional.)
"""
if config['ui']['color']:
global COLORS
if not COLORS:
COLORS = dict((name,
config['ui']['colors'][name].as_str())
for name in COLOR_NAMES)
# In case a 3rd party plugin is still passing the actual color ('red')
# instead of the abstract color name ('text_error')
color = COLORS.get(color_name)
if not color:
log.debug(u'Invalid color_name: {0}', color_name)
color = color_name
return _colorize(color, text)
else:
return text
def _colordiff(a, b, highlight='text_highlight',
minor_highlight='text_highlight_minor'):
"""Given two values, return the same pair of strings except with
their differences highlighted in the specified color. Strings are
highlighted intelligently to show differences; other values are
stringified and highlighted in their entirety.
"""
if not isinstance(a, six.string_types) \
or not isinstance(b, six.string_types):
# Non-strings: use ordinary equality.
a = six.text_type(a)
b = six.text_type(b)
if a == b:
return a, b
else:
return colorize(highlight, a), colorize(highlight, b)
if isinstance(a, bytes) or isinstance(b, bytes):
# A path field.
a = util.displayable_path(a)
b = util.displayable_path(b)
a_out = []
b_out = []
matcher = SequenceMatcher(lambda x: False, a, b)
for op, a_start, a_end, b_start, b_end in matcher.get_opcodes():
if op == 'equal':
# In both strings.
a_out.append(a[a_start:a_end])
b_out.append(b[b_start:b_end])
elif op == 'insert':
# Right only.
b_out.append(colorize(highlight, b[b_start:b_end]))
elif op == 'delete':
# Left only.
a_out.append(colorize(highlight, a[a_start:a_end]))
elif op == 'replace':
# Right and left differ. Colorise with second highlight if
# it's just a case change.
if a[a_start:a_end].lower() != b[b_start:b_end].lower():
color = highlight
else:
color = minor_highlight
a_out.append(colorize(color, a[a_start:a_end]))
b_out.append(colorize(color, b[b_start:b_end]))
else:
assert(False)
return u''.join(a_out), u''.join(b_out)
def colordiff(a, b, highlight='text_highlight'):
"""Colorize differences between two values if color is enabled.
(Like _colordiff but conditional.)
"""
if config['ui']['color']:
return _colordiff(a, b, highlight)
else:
return six.text_type(a), six.text_type(b)
def get_path_formats(subview=None):
"""Get the configuration's path formats as a list of query/template
pairs.
"""
path_formats = []
subview = subview or config['paths']
for query, view in subview.items():
query = PF_KEY_QUERIES.get(query, query) # Expand common queries.
path_formats.append((query, Template(view.as_str())))
return path_formats
def get_replacements():
"""Confit validation function that reads regex/string pairs.
"""
replacements = []
for pattern, repl in config['replace'].get(dict).items():
repl = repl or ''
try:
replacements.append((re.compile(pattern), repl))
except re.error:
raise UserError(
u'malformed regular expression in replace: {0}'.format(
pattern
)
)
return replacements
def term_width():
"""Get the width (columns) of the terminal."""
fallback = config['ui']['terminal_width'].get(int)
# The fcntl and termios modules are not available on non-Unix
# platforms, so we fall back to a constant.
try:
import fcntl
import termios
except ImportError:
return fallback
try:
buf = fcntl.ioctl(0, termios.TIOCGWINSZ, ' ' * 4)
except IOError:
return fallback
try:
height, width = struct.unpack('hh', buf)
except struct.error:
return fallback
return width
FLOAT_EPSILON = 0.01
def _field_diff(field, old, new):
"""Given two Model objects, format their values for `field` and
highlight changes among them. Return a human-readable string. If the
value has not changed, return None instead.
"""
oldval = old.get(field)
newval = new.get(field)
# If no change, abort.
if isinstance(oldval, float) and isinstance(newval, float) and \
abs(oldval - newval) < FLOAT_EPSILON:
return None
elif oldval == newval:
return None
# Get formatted values for output.
oldstr = old.formatted().get(field, u'')
newstr = new.formatted().get(field, u'')
# For strings, highlight changes. For others, colorize the whole
# thing.
if isinstance(oldval, six.string_types):
oldstr, newstr = colordiff(oldval, newstr)
else:
oldstr = colorize('text_error', oldstr)
newstr = colorize('text_error', newstr)
return u'{0} -> {1}'.format(oldstr, newstr)
def show_model_changes(new, old=None, fields=None, always=False):
"""Given a Model object, print a list of changes from its pristine
version stored in the database. Return a boolean indicating whether
any changes were found.
`old` may be the "original" object to avoid using the pristine
version from the database. `fields` may be a list of fields to
restrict the detection to. `always` indicates whether the object is
always identified, regardless of whether any changes are present.
"""
old = old or new._db._get(type(new), new.id)
# Build up lines showing changed fields.
changes = []
for field in old:
# Subset of the fields. Never show mtime.
if field == 'mtime' or (fields and field not in fields):
continue
# Detect and show difference for this field.
line = _field_diff(field, old, new)
if line:
changes.append(u' {0}: {1}'.format(field, line))
# New fields.
for field in set(new) - set(old):
if fields and field not in fields:
continue
changes.append(u' {0}: {1}'.format(
field,
colorize('text_highlight', new.formatted()[field])
))
# Print changes.
if changes or always:
print_(format(old))
if changes:
print_(u'\n'.join(changes))
return bool(changes)
def show_path_changes(path_changes):
"""Given a list of tuples (source, destination) that indicate the
path changes, log the changes as INFO-level output to the beets log.
The output is guaranteed to be unicode.
Every pair is shown on a single line if the terminal width permits it,
else it is split over two lines. E.g.,
Source -> Destination
vs.
Source
-> Destination
"""
sources, destinations = zip(*path_changes)
# Ensure unicode output
sources = list(map(util.displayable_path, sources))
destinations = list(map(util.displayable_path, destinations))
# Calculate widths for terminal split
col_width = (term_width() - len(' -> ')) // 2
max_width = len(max(sources + destinations, key=len))
if max_width > col_width:
# Print every change over two lines
for source, dest in zip(sources, destinations):
log.info(u'{0} \n -> {1}', source, dest)
else:
# Print every change on a single line, and add a header
title_pad = max_width - len('Source ') + len(' -> ')
log.info(u'Source {0} Destination', ' ' * title_pad)
for source, dest in zip(sources, destinations):
pad = max_width - len(source)
log.info(u'{0} {1} -> {2}', source, ' ' * pad, dest)
class CommonOptionsParser(optparse.OptionParser, object):
"""Offers a simple way to add common formatting options.
Options available include:
- matching albums instead of tracks: add_album_option()
- showing paths instead of items/albums: add_path_option()
- changing the format of displayed items/albums: add_format_option()
The last one can have several behaviors:
- against a special target
- with a certain format
- autodetected target with the album option
Each method is fully documented in the related method.
"""
def __init__(self, *args, **kwargs):
super(CommonOptionsParser, self).__init__(*args, **kwargs)
self._album_flags = False
# this serves both as an indicator that we offer the feature AND allows
# us to check whether it has been specified on the CLI - bypassing the
# fact that arguments may be in any order
def add_album_option(self, flags=('-a', '--album')):
"""Add a -a/--album option to match albums instead of tracks.
If used then the format option can auto-detect whether we're setting
the format for items or albums.
Sets the album property on the options extracted from the CLI.
"""
album = optparse.Option(*flags, action='store_true',
help=u'match albums instead of tracks')
self.add_option(album)
self._album_flags = set(flags)
def _set_format(self, option, opt_str, value, parser, target=None,
fmt=None, store_true=False):
"""Internal callback that sets the correct format while parsing CLI
arguments.
"""
if store_true:
setattr(parser.values, option.dest, True)
# Use the explicitly specified format, or the string from the option.
if fmt:
value = fmt
elif value:
value, = decargs([value])
else:
value = u''
parser.values.format = value
if target:
config[target._format_config_key].set(value)
else:
if self._album_flags:
if parser.values.album:
target = library.Album
else:
# the option is either missing either not parsed yet
if self._album_flags & set(parser.rargs):
target = library.Album
else:
target = library.Item
config[target._format_config_key].set(value)
else:
config[library.Item._format_config_key].set(value)
config[library.Album._format_config_key].set(value)
def add_path_option(self, flags=('-p', '--path')):
"""Add a -p/--path option to display the path instead of the default
format.
By default this affects both items and albums. If add_album_option()
is used then the target will be autodetected.
Sets the format property to u'$path' on the options extracted from the
CLI.
"""
path = optparse.Option(*flags, nargs=0, action='callback',
callback=self._set_format,
callback_kwargs={'fmt': u'$path',
'store_true': True},
help=u'print paths for matched items or albums')
self.add_option(path)
def add_format_option(self, flags=('-f', '--format'), target=None):
"""Add -f/--format option to print some LibModel instances with a
custom format.
`target` is optional and can be one of ``library.Item``, 'item',
``library.Album`` and 'album'.
Several behaviors are available:
- if `target` is given then the format is only applied to that
LibModel
- if the album option is used then the target will be autodetected
- otherwise the format is applied to both items and albums.
Sets the format property on the options extracted from the CLI.
"""
kwargs = {}
if target:
if isinstance(target, six.string_types):
target = {'item': library.Item,
'album': library.Album}[target]
kwargs['target'] = target
opt = optparse.Option(*flags, action='callback',
callback=self._set_format,
callback_kwargs=kwargs,
help=u'print with custom format')
self.add_option(opt)
def add_all_common_options(self):
"""Add album, path and format options.
"""
self.add_album_option()
self.add_path_option()
self.add_format_option()
# Subcommand parsing infrastructure.
#
# This is a fairly generic subcommand parser for optparse. It is
# maintained externally here:
# http://gist.github.com/462717
# There you will also find a better description of the code and a more
# succinct example program.
class Subcommand(object):
"""A subcommand of a root command-line application that may be
invoked by a SubcommandOptionParser.
"""
def __init__(self, name, parser=None, help='', aliases=(), hide=False):
"""Creates a new subcommand. name is the primary way to invoke
the subcommand; aliases are alternate names. parser is an
OptionParser responsible for parsing the subcommand's options.
help is a short description of the command. If no parser is
given, it defaults to a new, empty CommonOptionsParser.
"""
self.name = name
self.parser = parser or CommonOptionsParser()
self.aliases = aliases
self.help = help
self.hide = hide
self._root_parser = None
def print_help(self):
self.parser.print_help()
def parse_args(self, args):
return self.parser.parse_args(args)
@property
def root_parser(self):
return self._root_parser
@root_parser.setter
def root_parser(self, root_parser):
self._root_parser = root_parser
self.parser.prog = '{0} {1}'.format(
as_string(root_parser.get_prog_name()), self.name)
class SubcommandsOptionParser(CommonOptionsParser):
"""A variant of OptionParser that parses subcommands and their
arguments.
"""
def __init__(self, *args, **kwargs):
"""Create a new subcommand-aware option parser. All of the
options to OptionParser.__init__ are supported in addition
to subcommands, a sequence of Subcommand objects.
"""
# A more helpful default usage.
if 'usage' not in kwargs:
kwargs['usage'] = u"""
%prog COMMAND [ARGS...]
%prog help COMMAND"""
kwargs['add_help_option'] = False
# Super constructor.
super(SubcommandsOptionParser, self).__init__(*args, **kwargs)
# Our root parser needs to stop on the first unrecognized argument.
self.disable_interspersed_args()
self.subcommands = []
def add_subcommand(self, *cmds):
"""Adds a Subcommand object to the parser's list of commands.
"""
for cmd in cmds:
cmd.root_parser = self
self.subcommands.append(cmd)
# Add the list of subcommands to the help message.
def format_help(self, formatter=None):
# Get the original help message, to which we will append.
out = super(SubcommandsOptionParser, self).format_help(formatter)
if formatter is None:
formatter = self.formatter
# Subcommands header.
result = ["\n"]
result.append(formatter.format_heading('Commands'))
formatter.indent()
# Generate the display names (including aliases).
# Also determine the help position.
disp_names = []
help_position = 0
subcommands = [c for c in self.subcommands if not c.hide]
subcommands.sort(key=lambda c: c.name)
for subcommand in subcommands:
name = subcommand.name
if subcommand.aliases:
name += ' (%s)' % ', '.join(subcommand.aliases)
disp_names.append(name)
# Set the help position based on the max width.
proposed_help_position = len(name) + formatter.current_indent + 2
if proposed_help_position <= formatter.max_help_position:
help_position = max(help_position, proposed_help_position)
# Add each subcommand to the output.
for subcommand, name in zip(subcommands, disp_names):
# Lifted directly from optparse.py.