issue#13073: Fix formatting

IPython/core/hooks.py

@@ -1,171 +1,173 b''
 """Hooks for IPython.
 
 In Python, it is possible to overwrite any method of any object if you really
 want to.  But IPython exposes a few 'hooks', methods which are *designed* to
 be overwritten by users for customization purposes.  This module defines the
 default versions of all such hooks, which get used by IPython if not
 overridden by the user.
 
 Hooks are simple functions, but they should be declared with ``self`` as their
 first argument, because when activated they are registered into IPython as
 instance methods. The self argument will be the IPython running instance
 itself, so hooks have full access to the entire IPython object.
 
 If you wish to define a new hook and activate it, you can make an :doc:`extension
 </config/extensions/index>` or a :ref:`startup script <startup_files>`. For
 example, you could use a startup file like this::
 
     import os
 
     def calljed(self,filename, linenum):
         "My editor hook calls the jed editor directly."
         print "Calling my own editor, jed ..."
         if os.system('jed +%d %s' % (linenum,filename)) != 0:
             raise TryNext()
 
     def load_ipython_extension(ip):
         ip.set_hook('editor', calljed)
 
 """
 
 #*****************************************************************************
 #       Copyright (C) 2005 Fernando Perez. <[e-mail]>
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #*****************************************************************************
 
 import os
 import subprocess
 import sys
 
 from .error import TryNext
 
 # List here all the default hooks.  For now it's just the editor functions
 # but over time we'll move here all the public API for user-accessible things.
 
 __all__ = [
     "editor",
     "synchronize_with_editor",
     "show_in_pager",
     "pre_prompt_hook",
     "clipboard_get",
 ]
 
 deprecated = {'pre_run_code_hook': "a callback for the 'pre_execute' or 'pre_run_cell' event",
               'late_startup_hook': "a callback for the 'shell_initialized' event",
               'shutdown_hook': "the atexit module",
              }
 
 def editor(self, filename, linenum=None, wait=True):
     """Open the default editor at the given filename and linenumber.
 
     This is IPython's default editor hook, you can use it as an example to
     write your own modified one.  To set your own editor function as the
     new editor hook, call ip.set_hook('editor',yourfunc)."""
 
     # IPython configures a default editor at startup by reading $EDITOR from
     # the environment, and falling back on vi (unix) or notepad (win32).
     editor = self.editor
 
     # marker for at which line to open the file (for existing objects)
     if linenum is None or editor=='notepad':
         linemark = ''
     else:
         linemark = '+%d' % int(linenum)
 
     # Enclose in quotes if necessary and legal
     if ' ' in editor and os.path.isfile(editor) and editor[0] != '"':
         editor = '"%s"' % editor
 
     # Call the actual editor
     proc = subprocess.Popen('%s %s %s' % (editor, linemark, filename),
                             shell=True)
     if wait and proc.wait() != 0:
         raise TryNext()
 
 
 def synchronize_with_editor(self, filename, linenum, column):
         pass
 
 
 class CommandChainDispatcher:
     """ Dispatch calls to a chain of commands until some func can handle it
 
     Usage: instantiate, execute "add" to add commands (with optional
     priority), execute normally via f() calling mechanism.
 
     """
     def __init__(self,commands=None):
         if commands is None:
             self.chain = []
         else:
             self.chain = commands
 
 
     def __call__(self,*args, **kw):
         """ Command chain is called just like normal func.
 
         This will call all funcs in chain with the same args as were given to
         this function, and return the result of first func that didn't raise
         TryNext"""
         last_exc = TryNext()
         for prio,cmd in self.chain:
             #print "prio",prio,"cmd",cmd #dbg
             try:
                 return cmd(*args, **kw)
             except TryNext as exc:
                 last_exc = exc
         # if no function will accept it, raise TryNext up to the caller
         raise last_exc
 
     def __str__(self):
         return str(self.chain)
 
     def add(self, func, priority=0):
         """ Add a func to the cmd chain with given priority """
         self.chain.append((priority, func))
         self.chain.sort(key=lambda x: x[0])
 
     def __iter__(self):
         """ Return all objects in chain.
 
         Handy if the objects are not callable.
         """
         return iter(self.chain)
 
 
 def show_in_pager(self, data, start, screen_lines):
     """ Run a string through pager """
     # raising TryNext here will use the default paging functionality
     raise TryNext
 
 
 def pre_prompt_hook(self):
     """ Run before displaying the next prompt
 
     Use this e.g. to display output from asynchronous operations (in order
     to not mess up text entry)
     """
 
     return None
 
 
 def clipboard_get(self):
     """ Get text from the clipboard.
     """
     from ..lib.clipboard import (
-        osx_clipboard_get, tkinter_clipboard_get,
-        win32_clipboard_get, wayland_clipboard_get,
+        osx_clipboard_get,
+        tkinter_clipboard_get,
+        win32_clipboard_get,
+        wayland_clipboard_get,
     )
     if sys.platform == 'win32':
         chain = [win32_clipboard_get, tkinter_clipboard_get]
     elif sys.platform == 'darwin':
         chain = [osx_clipboard_get, tkinter_clipboard_get]
     else:
         chain = [wayland_clipboard_get, tkinter_clipboard_get]
     dispatcher = CommandChainDispatcher()
     for func in chain:
         dispatcher.add(func)
     text = dispatcher()
     return text