# -*- coding: utf-8 -*-
"""The xonsh built-ins.
Note that this module is named 'built_ins' so as not to be confused with the
special Python builtins module.
"""
import os
import re
import sys
import types
import signal
import atexit
import pathlib
import inspect
import warnings
import builtins
import itertools
import contextlib
import collections.abc as cabc
from ast import AST
from xonsh.lazyasd import lazyobject
from xonsh.inspectors import Inspector
from xonsh.platform import ON_POSIX, ON_WINDOWS
from xonsh.tools import (
expand_path,
globpath,
XonshError,
XonshCalledProcessError,
print_color,
)
INSPECTOR = Inspector()
warnings.filterwarnings("once", category=DeprecationWarning)
@lazyobject
def AT_EXIT_SIGNALS():
sigs = (
signal.SIGABRT,
signal.SIGFPE,
signal.SIGILL,
signal.SIGSEGV,
signal.SIGTERM,
)
if ON_POSIX:
sigs += (signal.SIGTSTP, signal.SIGQUIT, signal.SIGHUP)
return sigs
[docs]def resetting_signal_handle(sig, f):
"""Sets a new signal handle that will automatically restore the old value
once the new handle is finished.
"""
oldh = signal.getsignal(sig)
def newh(s=None, frame=None):
f(s, frame)
signal.signal(sig, oldh)
if sig != 0:
sys.exit(sig)
signal.signal(sig, newh)
[docs]def helper(x, name=""):
"""Prints help about, and then returns that variable."""
name = name or getattr(x, "__name__", "")
INSPECTOR.pinfo(x, oname=name, detail_level=0)
return x
[docs]def superhelper(x, name=""):
"""Prints help about, and then returns that variable."""
name = name or getattr(x, "__name__", "")
INSPECTOR.pinfo(x, oname=name, detail_level=1)
return x
[docs]def reglob(path, parts=None, i=None):
"""Regular expression-based globbing."""
if parts is None:
path = os.path.normpath(path)
drive, tail = os.path.splitdrive(path)
parts = tail.split(os.sep)
d = os.sep if os.path.isabs(path) else "."
d = os.path.join(drive, d)
return reglob(d, parts, i=0)
base = subdir = path
if i == 0:
if not os.path.isabs(base):
base = ""
elif len(parts) > 1:
i += 1
regex = os.path.join(base, parts[i])
if ON_WINDOWS:
# currently unable to access regex backslash sequences
# on Windows due to paths using \.
regex = regex.replace("\\", "\\\\")
regex = re.compile(regex)
files = os.listdir(subdir)
files.sort()
paths = []
i1 = i + 1
if i1 == len(parts):
for f in files:
p = os.path.join(base, f)
if regex.fullmatch(p) is not None:
paths.append(p)
else:
for f in files:
p = os.path.join(base, f)
if regex.fullmatch(p) is None or not os.path.isdir(p):
continue
paths += reglob(p, parts=parts, i=i1)
return paths
[docs]def path_literal(s):
s = expand_path(s)
return pathlib.Path(s)
[docs]def regexsearch(s):
s = expand_path(s)
return reglob(s)
[docs]def globsearch(s):
csc = XSH.env.get("CASE_SENSITIVE_COMPLETIONS")
glob_sorted = XSH.env.get("GLOB_SORTED")
dotglob = XSH.env.get("DOTGLOB")
return globpath(
s,
ignore_case=(not csc),
return_empty=True,
sort_result=glob_sorted,
include_dotfiles=dotglob,
)
[docs]def pathsearch(func, s, pymode=False, pathobj=False):
"""
Takes a string and returns a list of file paths that match (regex, glob,
or arbitrary search function). If pathobj=True, the return is a list of
pathlib.Path objects instead of strings.
"""
if not callable(func) or len(inspect.signature(func).parameters) != 1:
error = "%r is not a known path search function"
raise XonshError(error % func)
o = func(s)
if pathobj and pymode:
o = list(map(pathlib.Path, o))
no_match = [] if pymode else [s]
return o if len(o) != 0 else no_match
[docs]def subproc_captured_stdout(*cmds, envs=None):
"""Runs a subprocess, capturing the output. Returns the stdout
that was produced as a str.
"""
import xonsh.procs.specs
return xonsh.procs.specs.run_subproc(cmds, captured="stdout", envs=envs)
[docs]def subproc_captured_inject(*cmds, envs=None):
"""Runs a subprocess, capturing the output. Returns a list of
whitespace-separated strings of the stdout that was produced.
The string is split using xonsh's lexer, rather than Python's str.split()
or shlex.split().
"""
import xonsh.procs.specs
o = xonsh.procs.specs.run_subproc(cmds, captured="object", envs=envs)
o.end()
toks = []
for line in o:
line = line.rstrip(os.linesep)
toks.extend(XSH.execer.parser.lexer.split(line))
return toks
[docs]def subproc_captured_object(*cmds, envs=None):
"""
Runs a subprocess, capturing the output. Returns an instance of
CommandPipeline representing the completed command.
"""
import xonsh.procs.specs
return xonsh.procs.specs.run_subproc(cmds, captured="object", envs=envs)
[docs]def subproc_captured_hiddenobject(*cmds, envs=None):
"""Runs a subprocess, capturing the output. Returns an instance of
HiddenCommandPipeline representing the completed command.
"""
import xonsh.procs.specs
return xonsh.procs.specs.run_subproc(cmds, captured="hiddenobject", envs=envs)
[docs]def subproc_uncaptured(*cmds, envs=None):
"""Runs a subprocess, without capturing the output. Returns the stdout
that was produced as a str.
"""
import xonsh.procs.specs
return xonsh.procs.specs.run_subproc(cmds, captured=False, envs=envs)
[docs]def ensure_list_of_strs(x):
"""Ensures that x is a list of strings."""
if isinstance(x, str):
rtn = [x]
elif isinstance(x, cabc.Sequence):
rtn = [i if isinstance(i, str) else str(i) for i in x]
else:
rtn = [str(x)]
return rtn
[docs]def ensure_str_or_callable(x):
"""Ensures that x is single string or function."""
if isinstance(x, str) or callable(x):
return x
if isinstance(x, bytes):
# ``os.fsdecode`` decodes using "surrogateescape" on linux and "strict" on windows.
# This is used to decode bytes for interfacing with the os, notably for command line arguments.
# See https://www.python.org/dev/peps/pep-0383/#specification
return os.fsdecode(x)
return str(x)
[docs]def list_of_strs_or_callables(x):
"""
Ensures that x is a list of strings or functions.
This is called when using the ``@()`` operator to expand it's content.
"""
if isinstance(x, (str, bytes)) or callable(x):
rtn = [ensure_str_or_callable(x)]
elif isinstance(x, cabc.Iterable):
rtn = list(map(ensure_str_or_callable, x))
else:
rtn = [ensure_str_or_callable(x)]
return rtn
[docs]def list_of_list_of_strs_outer_product(x):
"""Takes an outer product of a list of strings"""
lolos = map(ensure_list_of_strs, x)
rtn = []
for los in itertools.product(*lolos):
s = "".join(los)
if "*" in s:
rtn.extend(XSH.glob(s))
else:
rtn.append(XSH.expand_path(s))
return rtn
[docs]def eval_fstring_field(field):
"""Evaluates the argument in Xonsh context."""
res = XSH.execer.eval(
field[0].strip(), glbs=globals(), locs=XSH.ctx, filename=field[1]
)
return res
@lazyobject
def MACRO_FLAG_KINDS():
return {
"s": str,
"str": str,
"string": str,
"a": AST,
"ast": AST,
"c": types.CodeType,
"code": types.CodeType,
"compile": types.CodeType,
"v": eval,
"eval": eval,
"x": exec,
"exec": exec,
"t": type,
"type": type,
}
def _convert_kind_flag(x):
"""Puts a kind flag (string) a canonical form."""
x = x.lower()
kind = MACRO_FLAG_KINDS.get(x, None)
if kind is None:
raise TypeError("{0!r} not a recognized macro type.".format(x))
return kind
[docs]def convert_macro_arg(raw_arg, kind, glbs, locs, *, name="<arg>", macroname="<macro>"):
"""Converts a string macro argument based on the requested kind.
Parameters
----------
raw_arg : str
The str representation of the macro argument.
kind : object
A flag or type representing how to convert the argument.
glbs : Mapping
The globals from the call site.
locs : Mapping or None
The locals from the call site.
name : str, optional
The macro argument name.
macroname : str, optional
The name of the macro itself.
Returns
-------
The converted argument.
"""
# munge kind and mode to start
mode = None
if isinstance(kind, cabc.Sequence) and not isinstance(kind, str):
# have (kind, mode) tuple
kind, mode = kind
if isinstance(kind, str):
kind = _convert_kind_flag(kind)
if kind is str or kind is None:
return raw_arg # short circuit since there is nothing else to do
# select from kind and convert
execer = XSH.execer
filename = macroname + "(" + name + ")"
if kind is AST:
ctx = set(dir(builtins)) | set(glbs.keys())
if locs is not None:
ctx |= set(locs.keys())
mode = mode or "eval"
if mode != "eval" and not raw_arg.endswith("\n"):
raw_arg += "\n"
arg = execer.parse(raw_arg, ctx, mode=mode, filename=filename)
elif kind is types.CodeType or kind is compile: # NOQA
mode = mode or "eval"
arg = execer.compile(
raw_arg, mode=mode, glbs=glbs, locs=locs, filename=filename
)
elif kind is eval:
arg = execer.eval(raw_arg, glbs=glbs, locs=locs, filename=filename)
elif kind is exec:
mode = mode or "exec"
if not raw_arg.endswith("\n"):
raw_arg += "\n"
arg = execer.exec(raw_arg, mode=mode, glbs=glbs, locs=locs, filename=filename)
elif kind is type:
arg = type(execer.eval(raw_arg, glbs=glbs, locs=locs, filename=filename))
else:
msg = "kind={0!r} and mode={1!r} was not recognized for macro " "argument {2!r}"
raise TypeError(msg.format(kind, mode, name))
return arg
[docs]@contextlib.contextmanager
def in_macro_call(f, glbs, locs):
"""Attaches macro globals and locals temporarily to function as a
context manager.
Parameters
----------
f : callable object
The function that is called as ``f(*args)``.
glbs : Mapping
The globals from the call site.
locs : Mapping or None
The locals from the call site.
"""
prev_glbs = getattr(f, "macro_globals", None)
prev_locs = getattr(f, "macro_locals", None)
f.macro_globals = glbs
f.macro_locals = locs
yield
if prev_glbs is None:
del f.macro_globals
else:
f.macro_globals = prev_glbs
if prev_locs is None:
del f.macro_locals
else:
f.macro_locals = prev_locs
[docs]def call_macro(f, raw_args, glbs, locs):
"""Calls a function as a macro, returning its result.
Parameters
----------
f : callable object
The function that is called as ``f(*args)``.
raw_args : tuple of str
The str representation of arguments of that were passed into the
macro. These strings will be parsed, compiled, evaled, or left as
a string depending on the annotations of f.
glbs : Mapping
The globals from the call site.
locs : Mapping or None
The locals from the call site.
"""
sig = inspect.signature(f)
empty = inspect.Parameter.empty
macroname = f.__name__
i = 0
args = []
for (key, param), raw_arg in zip(sig.parameters.items(), raw_args):
i += 1
if raw_arg == "*":
break
kind = param.annotation
if kind is empty or kind is None:
kind = str
arg = convert_macro_arg(
raw_arg, kind, glbs, locs, name=key, macroname=macroname
)
args.append(arg)
reg_args, kwargs = _eval_regular_args(raw_args[i:], glbs, locs)
args += reg_args
with in_macro_call(f, glbs, locs):
rtn = f(*args, **kwargs)
return rtn
@lazyobject
def KWARG_RE():
return re.compile(r"([A-Za-z_]\w*=|\*\*)")
def _starts_as_arg(s):
"""Tests if a string starts as a non-kwarg string would."""
return KWARG_RE.match(s) is None
def _eval_regular_args(raw_args, glbs, locs):
if not raw_args:
return [], {}
arglist = list(itertools.takewhile(_starts_as_arg, raw_args))
kwarglist = raw_args[len(arglist) :]
execer = XSH.execer
if not arglist:
args = arglist
kwargstr = "dict({})".format(", ".join(kwarglist))
kwargs = execer.eval(kwargstr, glbs=glbs, locs=locs)
elif not kwarglist:
argstr = "({},)".format(", ".join(arglist))
args = execer.eval(argstr, glbs=glbs, locs=locs)
kwargs = {}
else:
argstr = "({},)".format(", ".join(arglist))
kwargstr = "dict({})".format(", ".join(kwarglist))
both = "({}, {})".format(argstr, kwargstr)
args, kwargs = execer.eval(both, glbs=glbs, locs=locs)
return args, kwargs
[docs]def enter_macro(obj, raw_block, glbs, locs):
"""Prepares to enter a context manager macro by attaching the contents
of the macro block, globals, and locals to the object. These modifications
are made in-place and the original object is returned.
Parameters
----------
obj : context manager
The object that is about to be entered via a with-statement.
raw_block : str
The str of the block that is the context body.
This string will be parsed, compiled, evaled, or left as
a string depending on the return annotation of obj.__enter__.
glbs : Mapping
The globals from the context site.
locs : Mapping or None
The locals from the context site.
Returns
-------
obj : context manager
The same context manager but with the new macro information applied.
"""
# recurse down sequences
if isinstance(obj, cabc.Sequence):
for x in obj:
enter_macro(x, raw_block, glbs, locs)
return obj
# convert block as needed
kind = getattr(obj, "__xonsh_block__", str)
macroname = getattr(obj, "__name__", "<context>")
block = convert_macro_arg(
raw_block, kind, glbs, locs, name="<with!>", macroname=macroname
)
# attach attrs
obj.macro_globals = glbs
obj.macro_locals = locs
obj.macro_block = block
return obj
def _lastflush(s=None, f=None):
if XSH.history is not None:
XSH.history.flush(at_exit=True)
[docs]@contextlib.contextmanager
def xonsh_builtins(execer=None):
"""A context manager for using the xonsh builtins only in a limited
scope. Likely useful in testing.
"""
XSH.load(execer=execer)
yield
XSH.unload()
[docs]class XonshSession:
"""All components defining a xonsh session."""
def __init__(self, execer=None, ctx=None):
"""
Parameters
----------
execer : Execer, optional
Xonsh execution object, may be None to start
ctx : Mapping, optional
Context to start xonsh session with.
"""
self.execer = execer
self.ctx = {} if ctx is None else ctx
self.builtins_loaded = False
self.history = None
self.shell = None
self.env = None
[docs] def load(self, execer=None, ctx=None, **kwargs):
"""Loads the session with default values.
Parameters
----------
execer : Execer, optional
Xonsh execution object, may be None to start
ctx : Mapping, optional
Context to start xonsh session with.
"""
from xonsh.environ import Env, default_env
from xonsh.commands_cache import CommandsCache
from xonsh.completers.init import default_completers
if not hasattr(builtins, "__xonsh__"):
builtins.__xonsh__ = self
if ctx is not None:
self.ctx = ctx
self.env = kwargs.pop("env") if "env" in kwargs else Env(default_env())
self.help = kwargs.pop("help") if "help" in kwargs else helper
self.superhelp = superhelper
self.pathsearch = pathsearch
self.globsearch = globsearch
self.regexsearch = regexsearch
self.glob = globpath
self.expand_path = expand_path
self.exit = False
self.stdout_uncaptured = None
self.stderr_uncaptured = None
if hasattr(builtins, "exit"):
self.pyexit = builtins.exit
del builtins.exit
if hasattr(builtins, "quit"):
self.pyquit = builtins.quit
del builtins.quit
self.subproc_captured_stdout = subproc_captured_stdout
self.subproc_captured_inject = subproc_captured_inject
self.subproc_captured_object = subproc_captured_object
self.subproc_captured_hiddenobject = subproc_captured_hiddenobject
self.subproc_uncaptured = subproc_uncaptured
self.execer = execer
self.commands_cache = CommandsCache()
self.all_jobs = {}
self.ensure_list_of_strs = ensure_list_of_strs
self.list_of_strs_or_callables = list_of_strs_or_callables
self.list_of_list_of_strs_outer_product = list_of_list_of_strs_outer_product
self.eval_fstring_field = eval_fstring_field
self.completers = default_completers()
self.call_macro = call_macro
self.enter_macro = enter_macro
self.path_literal = path_literal
self.builtins = _BuiltIns(execer)
aliases_given = kwargs.pop("aliases", None)
for attr, value in kwargs.items():
if hasattr(self, attr):
setattr(self, attr, value)
self.link_builtins(aliases_given)
self.builtins_loaded = True
[docs] def link_builtins(self, aliases=None):
from xonsh.aliases import Aliases, make_default_aliases
# public built-ins
proxy_mapping = [
"XonshError",
"XonshCalledProcessError",
"evalx",
"execx",
"compilex",
"events",
"print_color",
"printx",
]
for refname in proxy_mapping:
objname = f"__xonsh__.builtins.{refname}"
proxy = DynamicAccessProxy(refname, objname)
setattr(builtins, refname, proxy)
# sneak the path search functions into the aliases
# Need this inline/lazy import here since we use locate_binary that
# relies on __xonsh__.env in default aliases
if aliases is None:
aliases = Aliases(make_default_aliases())
self.aliases = builtins.default_aliases = builtins.aliases = aliases
atexit.register(_lastflush)
for sig in AT_EXIT_SIGNALS:
resetting_signal_handle(sig, _lastflush)
[docs] def unlink_builtins(self):
names = [
"XonshError",
"XonshCalledProcessError",
"evalx",
"execx",
"compilex",
"default_aliases",
"events",
"print_color",
"printx",
]
for name in names:
if hasattr(builtins, name):
delattr(builtins, name)
[docs] def unload(self):
if not hasattr(builtins, "__xonsh__"):
self.builtins_loaded = False
return
env = getattr(self, "env", None)
if hasattr(self.env, "undo_replace_env"):
env.undo_replace_env()
if hasattr(self, "pyexit"):
builtins.exit = self.pyexit
if hasattr(self, "pyquit"):
builtins.quit = self.pyquit
if not self.builtins_loaded:
return
self.unlink_builtins()
delattr(builtins, "__xonsh__")
self.builtins_loaded = False
class _BuiltIns:
def __init__(self, execer=None):
from xonsh.events import events
# public built-ins
self.XonshError = XonshError
self.XonshCalledProcessError = XonshCalledProcessError
self.evalx = None if execer is None else execer.eval
self.execx = None if execer is None else execer.exec
self.compilex = None if execer is None else execer.compile
self.events = events
self.print_color = self.printx = print_color
[docs]class DynamicAccessProxy:
"""Proxies access dynamically."""
def __init__(self, refname, objname):
"""
Parameters
----------
refname : str
'.'-separated string that represents the new, reference name that
the user will access.
objname : str
'.'-separated string that represents the name where the target
object actually lives that refname points to.
"""
super().__setattr__("refname", refname)
super().__setattr__("objname", objname)
@property
def obj(self):
"""Dynamically grabs object"""
names = self.objname.split(".")
obj = builtins
for name in names:
obj = getattr(obj, name)
return obj
def __getattr__(self, name):
return getattr(self.obj, name)
def __setattr__(self, name, value):
return super().__setattr__(self.obj, name, value)
def __delattr__(self, name):
return delattr(self.obj, name)
def __getitem__(self, item):
return self.obj.__getitem__(item)
def __setitem__(self, item, value):
return self.obj.__setitem__(item, value)
def __delitem__(self, item):
del self.obj[item]
def __call__(self, *args, **kwargs):
return self.obj.__call__(*args, **kwargs)
def __dir__(self):
return self.obj.__dir__()
# singleton
XSH = XonshSession()