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"""Extra magics for terminal use."""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from logging import error
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import os
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import sys
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from IPython.core.error import TryNext, UsageError
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from IPython.core.magic import Magics, magics_class, line_magic
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from IPython.lib.clipboard import ClipboardEmpty
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from IPython.utils.text import SList, strip_email_quotes
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from IPython.utils import py3compat
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def get_pasted_lines(sentinel, l_input=py3compat.input, quiet=False):
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""" Yield pasted lines until the user enters the given sentinel value.
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"""
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if not quiet:
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print("Pasting code; enter '%s' alone on the line to stop or use Ctrl-D." \
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% sentinel)
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prompt = ":"
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else:
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prompt = ""
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while True:
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try:
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l = l_input(prompt)
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if l == sentinel:
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return
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else:
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yield l
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except EOFError:
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print('<EOF>')
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return
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@magics_class
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class TerminalMagics(Magics):
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def __init__(self, shell):
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super(TerminalMagics, self).__init__(shell)
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def store_or_execute(self, block, name):
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""" Execute a block, or store it in a variable, per the user's request.
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"""
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if name:
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# If storing it for further editing
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self.shell.user_ns[name] = SList(block.splitlines())
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print("Block assigned to '%s'" % name)
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else:
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b = self.preclean_input(block)
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self.shell.user_ns['pasted_block'] = b
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self.shell.using_paste_magics = True
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try:
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self.shell.run_cell(b)
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finally:
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self.shell.using_paste_magics = False
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def preclean_input(self, block):
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lines = block.splitlines()
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while lines and not lines[0].strip():
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lines = lines[1:]
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return strip_email_quotes('\n'.join(lines))
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def rerun_pasted(self, name='pasted_block'):
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""" Rerun a previously pasted command.
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"""
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b = self.shell.user_ns.get(name)
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# Sanity checks
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if b is None:
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raise UsageError('No previous pasted block available')
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if not isinstance(b, str):
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raise UsageError(
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"Variable 'pasted_block' is not a string, can't execute")
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print("Re-executing '%s...' (%d chars)"% (b.split('\n',1)[0], len(b)))
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self.shell.run_cell(b)
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@line_magic
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def autoindent(self, parameter_s = ''):
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"""Toggle autoindent on/off (deprecated)"""
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self.shell.set_autoindent()
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print("Automatic indentation is:",['OFF','ON'][self.shell.autoindent])
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@line_magic
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def cpaste(self, parameter_s=''):
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"""Paste & execute a pre-formatted code block from clipboard.
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You must terminate the block with '--' (two minus-signs) or Ctrl-D
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alone on the line. You can also provide your own sentinel with '%paste
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-s %%' ('%%' is the new sentinel for this operation).
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The block is dedented prior to execution to enable execution of method
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definitions. '>' and '+' characters at the beginning of a line are
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ignored, to allow pasting directly from e-mails, diff files and
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doctests (the '...' continuation prompt is also stripped). The
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executed block is also assigned to variable named 'pasted_block' for
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later editing with '%edit pasted_block'.
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You can also pass a variable name as an argument, e.g. '%cpaste foo'.
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This assigns the pasted block to variable 'foo' as string, without
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dedenting or executing it (preceding >>> and + is still stripped)
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'%cpaste -r' re-executes the block previously entered by cpaste.
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'%cpaste -q' suppresses any additional output messages.
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Do not be alarmed by garbled output on Windows (it's a readline bug).
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Just press enter and type -- (and press enter again) and the block
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will be what was just pasted.
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Shell escapes are not supported (yet).
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See also
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--------
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paste: automatically pull code from clipboard.
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Examples
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--------
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::
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In [8]: %cpaste
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Pasting code; enter '--' alone on the line to stop.
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:>>> a = ["world!", "Hello"]
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:>>> print(" ".join(sorted(a)))
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:--
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Hello world!
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::
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In [8]: %cpaste
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Pasting code; enter '--' alone on the line to stop.
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:>>> %alias_magic t timeit
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:>>> %t -n1 pass
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:--
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Created `%t` as an alias for `%timeit`.
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Created `%%t` as an alias for `%%timeit`.
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354 ns ± 224 ns per loop (mean ± std. dev. of 7 runs, 1 loop each)
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"""
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opts, name = self.parse_options(parameter_s, 'rqs:', mode='string')
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if 'r' in opts:
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self.rerun_pasted()
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return
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quiet = ('q' in opts)
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sentinel = opts.get('s', u'--')
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block = '\n'.join(get_pasted_lines(sentinel, quiet=quiet))
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self.store_or_execute(block, name)
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@line_magic
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def paste(self, parameter_s=''):
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"""Paste & execute a pre-formatted code block from clipboard.
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The text is pulled directly from the clipboard without user
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intervention and printed back on the screen before execution (unless
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the -q flag is given to force quiet mode).
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The block is dedented prior to execution to enable execution of method
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definitions. '>' and '+' characters at the beginning of a line are
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ignored, to allow pasting directly from e-mails, diff files and
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doctests (the '...' continuation prompt is also stripped). The
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executed block is also assigned to variable named 'pasted_block' for
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later editing with '%edit pasted_block'.
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You can also pass a variable name as an argument, e.g. '%paste foo'.
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This assigns the pasted block to variable 'foo' as string, without
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executing it (preceding >>> and + is still stripped).
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Options:
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-r: re-executes the block previously entered by cpaste.
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-q: quiet mode: do not echo the pasted text back to the terminal.
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IPython statements (magics, shell escapes) are not supported (yet).
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See also
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--------
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cpaste: manually paste code into terminal until you mark its end.
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"""
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opts, name = self.parse_options(parameter_s, 'rq', mode='string')
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if 'r' in opts:
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self.rerun_pasted()
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return
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try:
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block = self.shell.hooks.clipboard_get()
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except TryNext as clipboard_exc:
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message = getattr(clipboard_exc, 'args')
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if message:
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error(message[0])
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else:
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error('Could not get text from the clipboard.')
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return
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except ClipboardEmpty as e:
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raise UsageError("The clipboard appears to be empty") from e
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# By default, echo back to terminal unless quiet mode is requested
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if 'q' not in opts:
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write = self.shell.write
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write(self.shell.pycolorize(block))
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if not block.endswith('\n'):
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write('\n')
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write("## -- End pasted text --\n")
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self.store_or_execute(block, name)
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# Class-level: add a '%cls' magic only on Windows
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if sys.platform == 'win32':
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@line_magic
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def cls(self, s):
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"""Clear screen.
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"""
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os.system("cls")
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