"""Return list of shell aliases to auto-define.

# Note: the aliases defined here should be safe to use on a kernel

# regardless of what frontend it is attached to. Frontends that use a

# kernel in-process can define additional aliases that will only work in

# their case. For example, things like 'less' or 'clear' that manipulate

# the terminal should NOT be declared here, as they will only work if the

# kernel is running inside a true terminal, and not over the network.

if os.name == 'posix':

default_aliases = [('mkdir', 'mkdir'), ('rmdir', 'rmdir'),

('mv', 'mv'), ('rm', 'rm'), ('cp', 'cp'),

('cat', 'cat'),

]

# Useful set of ls aliases. The GNU and BSD options are a little

# different, so we make aliases that provide as similar as possible

# behavior in ipython, by passing the right flags for each platform

if sys.platform.startswith('linux'):

ls_aliases = [('ls', 'ls -F --color'),

# long ls

('ll', 'ls -F -o --color'),

# ls normal files only

('lf', 'ls -F -o --color %l | grep ^-'),

# ls symbolic links

('lk', 'ls -F -o --color %l | grep ^l'),

# directories or links to directories,

('ldir', 'ls -F -o --color %l | grep /$'),

# things which are executable

('lx', 'ls -F -o --color %l | grep ^-..x'),

]

elif sys.platform.startswith('openbsd') or sys.platform.startswith('netbsd'):

# OpenBSD, NetBSD. The ls implementation on these platforms do not support

# the -G switch and lack the ability to use colorized output.

ls_aliases = [('ls', 'ls -F'),

# long ls

('ll', 'ls -F -l'),

# ls normal files only

('lf', 'ls -F -l %l | grep ^-'),

# ls symbolic links

('lk', 'ls -F -l %l | grep ^l'),

# directories or links to directories,

('ldir', 'ls -F -l %l | grep /$'),

# things which are executable

('lx', 'ls -F -l %l | grep ^-..x'),

]

else:

# BSD, OSX, etc.

ls_aliases = [('ls', 'ls -F -G'),

# long ls

('ll', 'ls -F -l -G'),

# ls normal files only

('lf', 'ls -F -l -G %l | grep ^-'),

# ls symbolic links

('lk', 'ls -F -l -G %l | grep ^l'),

# directories or links to directories,

('ldir', 'ls -F -G -l %l | grep /$'),

# things which are executable

('lx', 'ls -F -l -G %l | grep ^-..x'),

]

default_aliases = default_aliases + ls_aliases

elif os.name in ['nt', 'dos']:

default_aliases = [('ls', 'dir /on'),

('ddir', 'dir /ad /on'), ('ldir', 'dir /ad /on'),

('mkdir', 'mkdir'), ('rmdir', 'rmdir'),

('echo', 'echo'), ('ren', 'ren'), ('copy', 'copy'),

]

else:

default_aliases = []

"""Callable object storing the details of one alias.

# Prepare blacklist

blacklist = {'cd','popd','pushd','dhist','alias','unalias'}

def __init__(self, shell, name, cmd):

self.shell = shell

self.name = name

self.cmd = cmd

self.__doc__ = "Alias for `!{}`".format(cmd)

self.nargs = self.validate()

def validate(self):

"""Validate the alias, and return the number of arguments."""

if self.name in self.blacklist:

raise InvalidAliasError("The name %s can't be aliased "

"because it is a keyword or builtin." % self.name)

try:

caller = self.shell.magics_manager.magics['line'][self.name]

except KeyError:

pass

else:

if not isinstance(caller, Alias):

raise InvalidAliasError("The name %s can't be aliased "

"because it is another magic command." % self.name)

if not (isinstance(self.cmd, str)):

raise InvalidAliasError("An alias command must be a string, "

"got: %r" % self.cmd)

nargs = self.cmd.count('%s') - self.cmd.count('%%s')

if (nargs > 0) and (self.cmd.find('%l') >= 0):

raise InvalidAliasError('The %s and %l specifiers are mutually '

'exclusive in alias definitions.')

return nargs

def __repr__(self):

return "<alias {} for {!r}>".format(self.name, self.cmd)

def __call__(self, rest=''):

cmd = self.cmd

nargs = self.nargs

# Expand the %l special to be the user's input line

if cmd.find('%l') >= 0:

cmd = cmd.replace('%l', rest)

rest = ''

if nargs==0:

if cmd.find('%%s') >= 1:

cmd = cmd.replace('%%s', '%s')

# Simple, argument-less aliases

cmd = '%s %s' % (cmd, rest)

else:

# Handle aliases with positional arguments

args = rest.split(None, nargs)

if len(args) < nargs:

raise UsageError('Alias <%s> requires %s arguments, %s given.' %

(self.name, nargs, len(args)))

cmd = '%s %s' % (cmd % tuple(args[:nargs]),' '.join(args[nargs:]))

default_aliases = List(default_aliases()).tag(config=True)

user_aliases = List(default_value=[]).tag(config=True)

shell = Instance('IPython.core.interactiveshell.InteractiveShellABC', allow_none=True)

def __init__(self, shell=None, **kwargs):

super(AliasManager, self).__init__(shell=shell, **kwargs)

# For convenient access

self.linemagics = self.shell.magics_manager.magics['line']

self.init_aliases()

def init_aliases(self):

# Load default & user aliases

for name, cmd in self.default_aliases + self.user_aliases:

self.soft_define_alias(name, cmd)

@property

def aliases(self):

return [(n, func.cmd) for (n, func) in self.linemagics.items()

if isinstance(func, Alias)]

def soft_define_alias(self, name, cmd):

"""Define an alias, but don't raise on an AliasError."""

try:

self.define_alias(name, cmd)

except AliasError as e:

error("Invalid alias: %s" % e)

def define_alias(self, name, cmd):

"""Define a new alias after validating it.

caller = Alias(shell=self.shell, name=name, cmd=cmd)

self.shell.magics_manager.register_function(caller, magic_kind='line',

magic_name=name)

def get_alias(self, name):

"""Return an alias, or None if no alias by that name exists."""

aname = self.linemagics.get(name, None)

return aname if isinstance(aname, Alias) else None

def is_alias(self, name):

"""Return whether or not a given name has been defined as an alias"""

return self.get_alias(name) is not None

def undefine_alias(self, name):

if self.is_alias(name):

del self.linemagics[name]

else:

raise ValueError('%s is not an alias' % name)

def clear_aliases(self):

for name, cmd in self.aliases:

self.undefine_alias(name)

def retrieve_alias(self, name):

"""Retrieve the command to which an alias expands."""

caller = self.get_alias(name)

if caller:

return caller.cmd

else: