540 lines
20 KiB
Python
540 lines
20 KiB
Python
import os
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import sys
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import struct
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from ._compat import raw_input, text_type, string_types, \
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isatty, strip_ansi, get_winterm_size, DEFAULT_COLUMNS, WIN
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from .utils import echo
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from .exceptions import Abort, UsageError
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from .types import convert_type
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from .globals import resolve_color_default
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# The prompt functions to use. The doc tools currently override these
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# functions to customize how they work.
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visible_prompt_func = raw_input
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_ansi_colors = ('black', 'red', 'green', 'yellow', 'blue', 'magenta',
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'cyan', 'white', 'reset')
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_ansi_reset_all = '\033[0m'
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def hidden_prompt_func(prompt):
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import getpass
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return getpass.getpass(prompt)
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def _build_prompt(text, suffix, show_default=False, default=None):
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prompt = text
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if default is not None and show_default:
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prompt = '%s [%s]' % (prompt, default)
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return prompt + suffix
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def prompt(text, default=None, hide_input=False,
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confirmation_prompt=False, type=None,
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value_proc=None, prompt_suffix=': ',
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show_default=True, err=False):
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"""Prompts a user for input. This is a convenience function that can
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be used to prompt a user for input later.
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If the user aborts the input by sending a interrupt signal, this
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function will catch it and raise a :exc:`Abort` exception.
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.. versionadded:: 6.0
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Added unicode support for cmd.exe on Windows.
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.. versionadded:: 4.0
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Added the `err` parameter.
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:param text: the text to show for the prompt.
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:param default: the default value to use if no input happens. If this
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is not given it will prompt until it's aborted.
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:param hide_input: if this is set to true then the input value will
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be hidden.
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:param confirmation_prompt: asks for confirmation for the value.
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:param type: the type to use to check the value against.
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:param value_proc: if this parameter is provided it's a function that
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is invoked instead of the type conversion to
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convert a value.
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:param prompt_suffix: a suffix that should be added to the prompt.
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:param show_default: shows or hides the default value in the prompt.
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:param err: if set to true the file defaults to ``stderr`` instead of
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``stdout``, the same as with echo.
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"""
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result = None
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def prompt_func(text):
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f = hide_input and hidden_prompt_func or visible_prompt_func
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try:
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# Write the prompt separately so that we get nice
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# coloring through colorama on Windows
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echo(text, nl=False, err=err)
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return f('')
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except (KeyboardInterrupt, EOFError):
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# getpass doesn't print a newline if the user aborts input with ^C.
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# Allegedly this behavior is inherited from getpass(3).
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# A doc bug has been filed at https://bugs.python.org/issue24711
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if hide_input:
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echo(None, err=err)
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raise Abort()
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if value_proc is None:
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value_proc = convert_type(type, default)
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prompt = _build_prompt(text, prompt_suffix, show_default, default)
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while 1:
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while 1:
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value = prompt_func(prompt)
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if value:
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break
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# If a default is set and used, then the confirmation
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# prompt is always skipped because that's the only thing
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# that really makes sense.
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elif default is not None:
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return default
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try:
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result = value_proc(value)
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except UsageError as e:
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echo('Error: %s' % e.message, err=err)
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continue
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if not confirmation_prompt:
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return result
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while 1:
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value2 = prompt_func('Repeat for confirmation: ')
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if value2:
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break
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if value == value2:
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return result
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echo('Error: the two entered values do not match', err=err)
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def confirm(text, default=False, abort=False, prompt_suffix=': ',
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show_default=True, err=False):
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"""Prompts for confirmation (yes/no question).
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If the user aborts the input by sending a interrupt signal this
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function will catch it and raise a :exc:`Abort` exception.
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.. versionadded:: 4.0
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Added the `err` parameter.
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:param text: the question to ask.
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:param default: the default for the prompt.
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:param abort: if this is set to `True` a negative answer aborts the
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exception by raising :exc:`Abort`.
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:param prompt_suffix: a suffix that should be added to the prompt.
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:param show_default: shows or hides the default value in the prompt.
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:param err: if set to true the file defaults to ``stderr`` instead of
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``stdout``, the same as with echo.
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"""
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prompt = _build_prompt(text, prompt_suffix, show_default,
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default and 'Y/n' or 'y/N')
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while 1:
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try:
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# Write the prompt separately so that we get nice
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# coloring through colorama on Windows
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echo(prompt, nl=False, err=err)
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value = visible_prompt_func('').lower().strip()
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except (KeyboardInterrupt, EOFError):
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raise Abort()
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if value in ('y', 'yes'):
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rv = True
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elif value in ('n', 'no'):
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rv = False
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elif value == '':
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rv = default
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else:
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echo('Error: invalid input', err=err)
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continue
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break
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if abort and not rv:
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raise Abort()
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return rv
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def get_terminal_size():
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"""Returns the current size of the terminal as tuple in the form
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``(width, height)`` in columns and rows.
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"""
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# If shutil has get_terminal_size() (Python 3.3 and later) use that
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if sys.version_info >= (3, 3):
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import shutil
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shutil_get_terminal_size = getattr(shutil, 'get_terminal_size', None)
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if shutil_get_terminal_size:
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sz = shutil_get_terminal_size()
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return sz.columns, sz.lines
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if get_winterm_size is not None:
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return get_winterm_size()
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def ioctl_gwinsz(fd):
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try:
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import fcntl
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import termios
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cr = struct.unpack(
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'hh', fcntl.ioctl(fd, termios.TIOCGWINSZ, '1234'))
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except Exception:
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return
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return cr
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cr = ioctl_gwinsz(0) or ioctl_gwinsz(1) or ioctl_gwinsz(2)
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if not cr:
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try:
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fd = os.open(os.ctermid(), os.O_RDONLY)
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try:
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cr = ioctl_gwinsz(fd)
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finally:
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os.close(fd)
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except Exception:
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pass
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if not cr or not cr[0] or not cr[1]:
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cr = (os.environ.get('LINES', 25),
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os.environ.get('COLUMNS', DEFAULT_COLUMNS))
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return int(cr[1]), int(cr[0])
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def echo_via_pager(text, color=None):
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"""This function takes a text and shows it via an environment specific
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pager on stdout.
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.. versionchanged:: 3.0
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Added the `color` flag.
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:param text: the text to page.
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:param color: controls if the pager supports ANSI colors or not. The
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default is autodetection.
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"""
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color = resolve_color_default(color)
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if not isinstance(text, string_types):
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text = text_type(text)
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from ._termui_impl import pager
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return pager(text + '\n', color)
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def progressbar(iterable=None, length=None, label=None, show_eta=True,
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show_percent=None, show_pos=False,
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item_show_func=None, fill_char='#', empty_char='-',
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bar_template='%(label)s [%(bar)s] %(info)s',
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info_sep=' ', width=36, file=None, color=None):
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"""This function creates an iterable context manager that can be used
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to iterate over something while showing a progress bar. It will
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either iterate over the `iterable` or `length` items (that are counted
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up). While iteration happens, this function will print a rendered
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progress bar to the given `file` (defaults to stdout) and will attempt
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to calculate remaining time and more. By default, this progress bar
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will not be rendered if the file is not a terminal.
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The context manager creates the progress bar. When the context
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manager is entered the progress bar is already displayed. With every
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iteration over the progress bar, the iterable passed to the bar is
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advanced and the bar is updated. When the context manager exits,
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a newline is printed and the progress bar is finalized on screen.
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No printing must happen or the progress bar will be unintentionally
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destroyed.
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Example usage::
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with progressbar(items) as bar:
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for item in bar:
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do_something_with(item)
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Alternatively, if no iterable is specified, one can manually update the
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progress bar through the `update()` method instead of directly
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iterating over the progress bar. The update method accepts the number
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of steps to increment the bar with::
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with progressbar(length=chunks.total_bytes) as bar:
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for chunk in chunks:
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process_chunk(chunk)
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bar.update(chunks.bytes)
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.. versionadded:: 2.0
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.. versionadded:: 4.0
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Added the `color` parameter. Added a `update` method to the
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progressbar object.
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:param iterable: an iterable to iterate over. If not provided the length
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is required.
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:param length: the number of items to iterate over. By default the
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progressbar will attempt to ask the iterator about its
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length, which might or might not work. If an iterable is
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also provided this parameter can be used to override the
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length. If an iterable is not provided the progress bar
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will iterate over a range of that length.
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:param label: the label to show next to the progress bar.
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:param show_eta: enables or disables the estimated time display. This is
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automatically disabled if the length cannot be
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determined.
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:param show_percent: enables or disables the percentage display. The
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default is `True` if the iterable has a length or
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`False` if not.
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:param show_pos: enables or disables the absolute position display. The
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default is `False`.
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:param item_show_func: a function called with the current item which
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can return a string to show the current item
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next to the progress bar. Note that the current
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item can be `None`!
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:param fill_char: the character to use to show the filled part of the
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progress bar.
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:param empty_char: the character to use to show the non-filled part of
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the progress bar.
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:param bar_template: the format string to use as template for the bar.
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The parameters in it are ``label`` for the label,
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``bar`` for the progress bar and ``info`` for the
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info section.
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:param info_sep: the separator between multiple info items (eta etc.)
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:param width: the width of the progress bar in characters, 0 means full
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terminal width
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:param file: the file to write to. If this is not a terminal then
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only the label is printed.
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:param color: controls if the terminal supports ANSI colors or not. The
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default is autodetection. This is only needed if ANSI
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codes are included anywhere in the progress bar output
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which is not the case by default.
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"""
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from ._termui_impl import ProgressBar
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color = resolve_color_default(color)
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return ProgressBar(iterable=iterable, length=length, show_eta=show_eta,
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show_percent=show_percent, show_pos=show_pos,
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item_show_func=item_show_func, fill_char=fill_char,
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empty_char=empty_char, bar_template=bar_template,
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info_sep=info_sep, file=file, label=label,
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width=width, color=color)
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def clear():
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"""Clears the terminal screen. This will have the effect of clearing
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the whole visible space of the terminal and moving the cursor to the
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top left. This does not do anything if not connected to a terminal.
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.. versionadded:: 2.0
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"""
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if not isatty(sys.stdout):
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return
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# If we're on Windows and we don't have colorama available, then we
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# clear the screen by shelling out. Otherwise we can use an escape
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# sequence.
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if WIN:
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os.system('cls')
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else:
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sys.stdout.write('\033[2J\033[1;1H')
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def style(text, fg=None, bg=None, bold=None, dim=None, underline=None,
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blink=None, reverse=None, reset=True):
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"""Styles a text with ANSI styles and returns the new string. By
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default the styling is self contained which means that at the end
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of the string a reset code is issued. This can be prevented by
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passing ``reset=False``.
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Examples::
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click.echo(click.style('Hello World!', fg='green'))
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click.echo(click.style('ATTENTION!', blink=True))
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click.echo(click.style('Some things', reverse=True, fg='cyan'))
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Supported color names:
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* ``black`` (might be a gray)
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* ``red``
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* ``green``
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* ``yellow`` (might be an orange)
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* ``blue``
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* ``magenta``
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* ``cyan``
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* ``white`` (might be light gray)
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* ``reset`` (reset the color code only)
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.. versionadded:: 2.0
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:param text: the string to style with ansi codes.
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:param fg: if provided this will become the foreground color.
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:param bg: if provided this will become the background color.
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:param bold: if provided this will enable or disable bold mode.
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:param dim: if provided this will enable or disable dim mode. This is
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badly supported.
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:param underline: if provided this will enable or disable underline.
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:param blink: if provided this will enable or disable blinking.
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:param reverse: if provided this will enable or disable inverse
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rendering (foreground becomes background and the
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other way round).
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:param reset: by default a reset-all code is added at the end of the
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string which means that styles do not carry over. This
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can be disabled to compose styles.
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"""
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bits = []
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if fg:
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try:
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bits.append('\033[%dm' % (_ansi_colors.index(fg) + 30))
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except ValueError:
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raise TypeError('Unknown color %r' % fg)
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if bg:
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try:
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bits.append('\033[%dm' % (_ansi_colors.index(bg) + 40))
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except ValueError:
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raise TypeError('Unknown color %r' % bg)
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if bold is not None:
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bits.append('\033[%dm' % (1 if bold else 22))
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if dim is not None:
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bits.append('\033[%dm' % (2 if dim else 22))
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if underline is not None:
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bits.append('\033[%dm' % (4 if underline else 24))
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if blink is not None:
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bits.append('\033[%dm' % (5 if blink else 25))
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if reverse is not None:
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bits.append('\033[%dm' % (7 if reverse else 27))
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bits.append(text)
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if reset:
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bits.append(_ansi_reset_all)
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return ''.join(bits)
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def unstyle(text):
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"""Removes ANSI styling information from a string. Usually it's not
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necessary to use this function as Click's echo function will
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automatically remove styling if necessary.
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.. versionadded:: 2.0
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:param text: the text to remove style information from.
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"""
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return strip_ansi(text)
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def secho(text, file=None, nl=True, err=False, color=None, **styles):
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"""This function combines :func:`echo` and :func:`style` into one
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call. As such the following two calls are the same::
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click.secho('Hello World!', fg='green')
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click.echo(click.style('Hello World!', fg='green'))
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All keyword arguments are forwarded to the underlying functions
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depending on which one they go with.
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.. versionadded:: 2.0
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"""
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return echo(style(text, **styles), file=file, nl=nl, err=err, color=color)
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def edit(text=None, editor=None, env=None, require_save=True,
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extension='.txt', filename=None):
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r"""Edits the given text in the defined editor. If an editor is given
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(should be the full path to the executable but the regular operating
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system search path is used for finding the executable) it overrides
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the detected editor. Optionally, some environment variables can be
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used. If the editor is closed without changes, `None` is returned. In
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case a file is edited directly the return value is always `None` and
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`require_save` and `extension` are ignored.
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If the editor cannot be opened a :exc:`UsageError` is raised.
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Note for Windows: to simplify cross-platform usage, the newlines are
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automatically converted from POSIX to Windows and vice versa. As such,
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the message here will have ``\n`` as newline markers.
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:param text: the text to edit.
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:param editor: optionally the editor to use. Defaults to automatic
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detection.
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:param env: environment variables to forward to the editor.
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:param require_save: if this is true, then not saving in the editor
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will make the return value become `None`.
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:param extension: the extension to tell the editor about. This defaults
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to `.txt` but changing this might change syntax
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highlighting.
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:param filename: if provided it will edit this file instead of the
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provided text contents. It will not use a temporary
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file as an indirection in that case.
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"""
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from ._termui_impl import Editor
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editor = Editor(editor=editor, env=env, require_save=require_save,
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extension=extension)
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if filename is None:
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return editor.edit(text)
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editor.edit_file(filename)
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def launch(url, wait=False, locate=False):
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"""This function launches the given URL (or filename) in the default
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viewer application for this file type. If this is an executable, it
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might launch the executable in a new session. The return value is
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the exit code of the launched application. Usually, ``0`` indicates
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success.
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Examples::
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click.launch('http://click.pocoo.org/')
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click.launch('/my/downloaded/file', locate=True)
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.. versionadded:: 2.0
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:param url: URL or filename of the thing to launch.
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:param wait: waits for the program to stop.
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:param locate: if this is set to `True` then instead of launching the
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application associated with the URL it will attempt to
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launch a file manager with the file located. This
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might have weird effects if the URL does not point to
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the filesystem.
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"""
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from ._termui_impl import open_url
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return open_url(url, wait=wait, locate=locate)
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# If this is provided, getchar() calls into this instead. This is used
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# for unittesting purposes.
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_getchar = None
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def getchar(echo=False):
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"""Fetches a single character from the terminal and returns it. This
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will always return a unicode character and under certain rare
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circumstances this might return more than one character. The
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situations which more than one character is returned is when for
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whatever reason multiple characters end up in the terminal buffer or
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standard input was not actually a terminal.
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Note that this will always read from the terminal, even if something
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is piped into the standard input.
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.. versionadded:: 2.0
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|
|
:param echo: if set to `True`, the character read will also show up on
|
|
the terminal. The default is to not show it.
|
|
"""
|
|
f = _getchar
|
|
if f is None:
|
|
from ._termui_impl import getchar as f
|
|
return f(echo)
|
|
|
|
|
|
def pause(info='Press any key to continue ...', err=False):
|
|
"""This command stops execution and waits for the user to press any
|
|
key to continue. This is similar to the Windows batch "pause"
|
|
command. If the program is not run through a terminal, this command
|
|
will instead do nothing.
|
|
|
|
.. versionadded:: 2.0
|
|
|
|
.. versionadded:: 4.0
|
|
Added the `err` parameter.
|
|
|
|
:param info: the info string to print before pausing.
|
|
:param err: if set to message goes to ``stderr`` instead of
|
|
``stdout``, the same as with echo.
|
|
"""
|
|
if not isatty(sys.stdin) or not isatty(sys.stdout):
|
|
return
|
|
try:
|
|
if info:
|
|
echo(info, nl=False, err=err)
|
|
try:
|
|
getchar()
|
|
except (KeyboardInterrupt, EOFError):
|
|
pass
|
|
finally:
|
|
if info:
|
|
echo(err=err)
|