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#!/usr/bin/env python
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# encoding: utf-8
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"""
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IPython's alias component
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Authors:
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* Brian Granger
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2009 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import __builtin__
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import keyword
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import os
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import re
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import sys
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from IPython.core.component import Component
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from IPython.core.splitinput import split_user_input
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from IPython.utils.traitlets import CBool, List, Instance
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from IPython.utils.genutils import error
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from IPython.utils.autoattr import auto_attr
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#-----------------------------------------------------------------------------
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# Utilities
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#-----------------------------------------------------------------------------
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# This is used as the pattern for calls to split_user_input.
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shell_line_split = re.compile(r'^(\s*)(\S*\s*)(.*$)')
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def default_aliases():
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# Make some aliases automatically
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# Prepare list of shell aliases to auto-define
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if os.name == 'posix':
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default_aliases = ('mkdir mkdir', 'rmdir rmdir',
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'mv mv -i','rm rm -i','cp cp -i',
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'cat cat','less less','clear clear',
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# a better ls
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'ls ls -F',
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# long ls
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'll ls -lF')
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# Extra ls aliases with color, which need special treatment on BSD
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# variants
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ls_extra = ( # color ls
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'lc ls -F -o --color',
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# ls normal files only
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'lf ls -F -o --color %l | grep ^-',
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# ls symbolic links
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'lk ls -F -o --color %l | grep ^l',
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# directories or links to directories,
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'ldir ls -F -o --color %l | grep /$',
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# things which are executable
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'lx ls -F -o --color %l | grep ^-..x',
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)
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# The BSDs don't ship GNU ls, so they don't understand the
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# --color switch out of the box
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if 'bsd' in sys.platform:
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ls_extra = ( # ls normal files only
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'lf ls -lF | grep ^-',
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# ls symbolic links
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'lk ls -lF | grep ^l',
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# directories or links to directories,
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'ldir ls -lF | grep /$',
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# things which are executable
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'lx ls -lF | grep ^-..x',
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)
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default_aliases = default_aliases + ls_extra
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elif os.name in ['nt','dos']:
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default_aliases = ('ls dir /on',
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'ddir dir /ad /on', 'ldir dir /ad /on',
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'mkdir mkdir','rmdir rmdir','echo echo',
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'ren ren','cls cls','copy copy')
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else:
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default_aliases = ()
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return [s.split(None,1) for s in default_aliases]
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class AliasError(Exception):
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pass
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class InvalidAliasError(AliasError):
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pass
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#-----------------------------------------------------------------------------
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# Main AliasManager class
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#-----------------------------------------------------------------------------
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class AliasManager(Component):
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default_aliases = List(default_aliases(), config=True)
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user_aliases = List(default_value=[], config=True)
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def __init__(self, parent, config=None):
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super(AliasManager, self).__init__(parent, config=config)
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self.alias_table = {}
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self.exclude_aliases()
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self.init_aliases()
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@auto_attr
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def shell(self):
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return Component.get_instances(
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root=self.root,
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klass='IPython.core.iplib.InteractiveShell')[0]
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def __contains__(self, name):
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if name in self.alias_table:
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return True
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else:
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return False
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@property
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def aliases(self):
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return [(item[0], item[1][1]) for item in self.alias_table.iteritems()]
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def exclude_aliases(self):
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# set of things NOT to alias (keywords, builtins and some magics)
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no_alias = set(['cd','popd','pushd','dhist','alias','unalias'])
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no_alias.update(set(keyword.kwlist))
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no_alias.update(set(__builtin__.__dict__.keys()))
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self.no_alias = no_alias
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def init_aliases(self):
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# Load default aliases
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for name, cmd in self.default_aliases:
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self.soft_define_alias(name, cmd)
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# Load user aliases
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for name, cmd in self.user_aliases:
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self.soft_define_alias(name, cmd)
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def clear_aliases(self):
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self.alias_table.clear()
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def soft_define_alias(self, name, cmd):
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"""Define an alias, but don't raise on an AliasError."""
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try:
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self.define_alias(name, cmd)
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except AliasError, e:
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error("Invalid alias: %s" % e)
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def define_alias(self, name, cmd):
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"""Define a new alias after validating it.
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This will raise an :exc:`AliasError` if there are validation
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problems.
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"""
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nargs = self.validate_alias(name, cmd)
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self.alias_table[name] = (nargs, cmd)
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def undefine_alias(self, name):
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if self.alias_table.has_key(name):
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del self.alias_table[name]
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def validate_alias(self, name, cmd):
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"""Validate an alias and return the its number of arguments."""
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if name in self.no_alias:
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raise InvalidAliasError("The name %s can't be aliased "
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"because it is a keyword or builtin." % name)
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if not (isinstance(cmd, basestring)):
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raise InvalidAliasError("An alias command must be a string, "
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"got: %r" % name)
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nargs = cmd.count('%s')
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if nargs>0 and cmd.find('%l')>=0:
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raise InvalidAliasError('The %s and %l specifiers are mutually '
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'exclusive in alias definitions.')
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return nargs
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def call_alias(self, alias, rest=''):
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"""Call an alias given its name and the rest of the line."""
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cmd = self.transform_alias(alias, rest)
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try:
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self.shell.system(cmd)
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except:
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self.shell.showtraceback()
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def transform_alias(self, alias,rest=''):
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"""Transform alias to system command string."""
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nargs, cmd = self.alias_table[alias]
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if ' ' in cmd and os.path.isfile(cmd):
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cmd = '"%s"' % cmd
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# Expand the %l special to be the user's input line
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if cmd.find('%l') >= 0:
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cmd = cmd.replace('%l', rest)
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rest = ''
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if nargs==0:
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# Simple, argument-less aliases
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cmd = '%s %s' % (cmd, rest)
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else:
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# Handle aliases with positional arguments
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args = rest.split(None, nargs)
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if len(args) < nargs:
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raise AliasError('Alias <%s> requires %s arguments, %s given.' %
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(alias, nargs, len(args)))
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cmd = '%s %s' % (cmd % tuple(args[:nargs]),' '.join(args[nargs:]))
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return cmd
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def expand_alias(self, line):
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""" Expand an alias in the command line
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Returns the provided command line, possibly with the first word
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(command) translated according to alias expansion rules.
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[ipython]|16> _ip.expand_aliases("np myfile.txt")
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<16> 'q:/opt/np/notepad++.exe myfile.txt'
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"""
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pre,fn,rest = split_user_input(line)
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res = pre + self.expand_aliases(fn, rest)
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return res
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def expand_aliases(self, fn, rest):
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"""Expand multiple levels of aliases:
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if:
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alias foo bar /tmp
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alias baz foo
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then:
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baz huhhahhei -> bar /tmp huhhahhei
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"""
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line = fn + " " + rest
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done = set()
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while 1:
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pre,fn,rest = split_user_input(line, shell_line_split)
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if fn in self.alias_table:
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if fn in done:
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warn("Cyclic alias definition, repeated '%s'" % fn)
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return ""
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done.add(fn)
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l2 = self.transform_alias(fn, rest)
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if l2 == line:
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break
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# ls -> ls -F should not recurse forever
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if l2.split(None,1)[0] == line.split(None,1)[0]:
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line = l2
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break
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line=l2
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else:
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break
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return line
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