alias.py
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| text/x-python
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PythonLexer
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r2243 | # encoding: utf-8 | ||
""" | ||||
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r2731 | System command aliases. | ||
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r2243 | |||
Authors: | ||||
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r2731 | * Fernando Perez | ||
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r2243 | * Brian Granger | ||
""" | ||||
#----------------------------------------------------------------------------- | ||||
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r3003 | # Copyright (C) 2008-2010 The IPython Development Team | ||
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r2243 | # | ||
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r3003 | # Distributed under the terms of the BSD License. | ||
# | ||||
# The full license is in the file COPYING.txt, distributed with this software. | ||||
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r2243 | #----------------------------------------------------------------------------- | ||
#----------------------------------------------------------------------------- | ||||
# Imports | ||||
#----------------------------------------------------------------------------- | ||||
import __builtin__ | ||||
import keyword | ||||
import os | ||||
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r2244 | import re | ||
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r2243 | import sys | ||
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r2731 | from IPython.config.configurable import Configurable | ||
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r2244 | from IPython.core.splitinput import split_user_input | ||
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r2243 | |||
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r2731 | from IPython.utils.traitlets import List, Instance | ||
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r2244 | from IPython.utils.autoattr import auto_attr | ||
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r2498 | from IPython.utils.warn import warn, error | ||
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r2243 | |||
#----------------------------------------------------------------------------- | ||||
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r2244 | # Utilities | ||
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r2243 | #----------------------------------------------------------------------------- | ||
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r2244 | # This is used as the pattern for calls to split_user_input. | ||
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r4744 | shell_line_split = re.compile(r'^(\s*)()(\S+)(.*$)') | ||
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r2244 | |||
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r2243 | def default_aliases(): | ||
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r3003 | """Return list of shell aliases to auto-define. | ||
""" | ||||
# Note: the aliases defined here should be safe to use on a kernel | ||||
# regardless of what frontend it is attached to. Frontends that use a | ||||
# kernel in-process can define additional aliases that will only work in | ||||
# their case. For example, things like 'less' or 'clear' that manipulate | ||||
# the terminal should NOT be declared here, as they will only work if the | ||||
# kernel is running inside a true terminal, and not over the network. | ||||
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r2243 | if os.name == 'posix': | ||
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r3003 | default_aliases = [('mkdir', 'mkdir'), ('rmdir', 'rmdir'), | ||
('mv', 'mv -i'), ('rm', 'rm -i'), ('cp', 'cp -i'), | ||||
('cat', 'cat'), | ||||
] | ||||
# Useful set of ls aliases. The GNU and BSD options are a little | ||||
# different, so we make aliases that provide as similar as possible | ||||
# behavior in ipython, by passing the right flags for each platform | ||||
if sys.platform.startswith('linux'): | ||||
ls_aliases = [('ls', 'ls -F --color'), | ||||
# long ls | ||||
('ll', 'ls -F -o --color'), | ||||
# ls normal files only | ||||
('lf', 'ls -F -o --color %l | grep ^-'), | ||||
# ls symbolic links | ||||
('lk', 'ls -F -o --color %l | grep ^l'), | ||||
# directories or links to directories, | ||||
('ldir', 'ls -F -o --color %l | grep /$'), | ||||
# things which are executable | ||||
('lx', 'ls -F -o --color %l | grep ^-..x'), | ||||
] | ||||
else: | ||||
# BSD, OSX, etc. | ||||
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'), | ||||
] | ||||
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'), | ||||
] | ||||
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r2243 | else: | ||
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r3003 | default_aliases = [] | ||
return default_aliases | ||||
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r2243 | |||
class AliasError(Exception): | ||||
pass | ||||
class InvalidAliasError(AliasError): | ||||
pass | ||||
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r2244 | #----------------------------------------------------------------------------- | ||
# Main AliasManager class | ||||
#----------------------------------------------------------------------------- | ||||
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r2731 | class AliasManager(Configurable): | ||
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r2243 | |||
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r2245 | default_aliases = List(default_aliases(), config=True) | ||
user_aliases = List(default_value=[], config=True) | ||||
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r2760 | shell = Instance('IPython.core.interactiveshell.InteractiveShellABC') | ||
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r2243 | |||
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r2740 | def __init__(self, shell=None, config=None): | ||
super(AliasManager, self).__init__(shell=shell, config=config) | ||||
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r2243 | self.alias_table = {} | ||
self.exclude_aliases() | ||||
self.init_aliases() | ||||
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r2244 | |||
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r2243 | def __contains__(self, name): | ||
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r3003 | return name in self.alias_table | ||
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r2243 | |||
@property | ||||
def aliases(self): | ||||
return [(item[0], item[1][1]) for item in self.alias_table.iteritems()] | ||||
def exclude_aliases(self): | ||||
# set of things NOT to alias (keywords, builtins and some magics) | ||||
no_alias = set(['cd','popd','pushd','dhist','alias','unalias']) | ||||
no_alias.update(set(keyword.kwlist)) | ||||
no_alias.update(set(__builtin__.__dict__.keys())) | ||||
self.no_alias = no_alias | ||||
def init_aliases(self): | ||||
# Load default aliases | ||||
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r2245 | for name, cmd in self.default_aliases: | ||
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r2243 | self.soft_define_alias(name, cmd) | ||
# Load user aliases | ||||
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r2245 | for name, cmd in self.user_aliases: | ||
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r2243 | self.soft_define_alias(name, cmd) | ||
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r2245 | def clear_aliases(self): | ||
self.alias_table.clear() | ||||
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r2243 | 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, e: | ||||
error("Invalid alias: %s" % e) | ||||
def define_alias(self, name, cmd): | ||||
"""Define a new alias after validating it. | ||||
This will raise an :exc:`AliasError` if there are validation | ||||
problems. | ||||
""" | ||||
nargs = self.validate_alias(name, cmd) | ||||
self.alias_table[name] = (nargs, cmd) | ||||
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r2245 | def undefine_alias(self, name): | ||
if self.alias_table.has_key(name): | ||||
del self.alias_table[name] | ||||
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r2243 | def validate_alias(self, name, cmd): | ||
"""Validate an alias and return the its number of arguments.""" | ||||
if name in self.no_alias: | ||||
raise InvalidAliasError("The name %s can't be aliased " | ||||
"because it is a keyword or builtin." % name) | ||||
if not (isinstance(cmd, basestring)): | ||||
raise InvalidAliasError("An alias command must be a string, " | ||||
"got: %r" % name) | ||||
nargs = cmd.count('%s') | ||||
if nargs>0 and cmd.find('%l')>=0: | ||||
raise InvalidAliasError('The %s and %l specifiers are mutually ' | ||||
'exclusive in alias definitions.') | ||||
return nargs | ||||
def call_alias(self, alias, rest=''): | ||||
"""Call an alias given its name and the rest of the line.""" | ||||
cmd = self.transform_alias(alias, rest) | ||||
try: | ||||
self.shell.system(cmd) | ||||
except: | ||||
self.shell.showtraceback() | ||||
def transform_alias(self, alias,rest=''): | ||||
"""Transform alias to system command string.""" | ||||
nargs, cmd = self.alias_table[alias] | ||||
if ' ' in cmd and os.path.isfile(cmd): | ||||
cmd = '"%s"' % cmd | ||||
# 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: | ||||
# 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 AliasError('Alias <%s> requires %s arguments, %s given.' % | ||||
(alias, nargs, len(args))) | ||||
cmd = '%s %s' % (cmd % tuple(args[:nargs]),' '.join(args[nargs:])) | ||||
return cmd | ||||
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r2244 | |||
def expand_alias(self, line): | ||||
""" Expand an alias in the command line | ||||
Returns the provided command line, possibly with the first word | ||||
(command) translated according to alias expansion rules. | ||||
[ipython]|16> _ip.expand_aliases("np myfile.txt") | ||||
<16> 'q:/opt/np/notepad++.exe myfile.txt' | ||||
""" | ||||
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r4744 | pre,_,fn,rest = split_user_input(line) | ||
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r2244 | res = pre + self.expand_aliases(fn, rest) | ||
return res | ||||
def expand_aliases(self, fn, rest): | ||||
"""Expand multiple levels of aliases: | ||||
if: | ||||
alias foo bar /tmp | ||||
alias baz foo | ||||
then: | ||||
baz huhhahhei -> bar /tmp huhhahhei | ||||
""" | ||||
line = fn + " " + rest | ||||
done = set() | ||||
while 1: | ||||
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r4744 | pre,_,fn,rest = split_user_input(line, shell_line_split) | ||
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r2244 | if fn in self.alias_table: | ||
if fn in done: | ||||
warn("Cyclic alias definition, repeated '%s'" % fn) | ||||
return "" | ||||
done.add(fn) | ||||
l2 = self.transform_alias(fn, rest) | ||||
if l2 == line: | ||||
break | ||||
# ls -> ls -F should not recurse forever | ||||
if l2.split(None,1)[0] == line.split(None,1)[0]: | ||||
line = l2 | ||||
break | ||||
line=l2 | ||||
else: | ||||
break | ||||
return line | ||||