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