xonsh/tests/test_environ.py

"""Tests the xonsh environment."""
import datetime
import os
import pathlib
import re
from random import shuffle
from tempfile import TemporaryDirectory
from threading import Thread
from time import sleep

import pytest

from xonsh.environ import (
    Env,
    InternalEnvironDict,
    LsColors,
    Var,
    default_env,
    default_value,
    locate_binary,
    make_args_env,
)
from xonsh.pytest.tools import skip_if_on_unix
from xonsh.tools import DefaultNotGiven, always_true


def test_env_normal():
    env = Env(VAR="wakka")
    assert "wakka" == env["VAR"]


def test_env_contains():
    env = Env(VAR="wakka")
    assert "VAR" in env


@pytest.mark.parametrize("path", [["/home/wakka"], ["wakka"]])
def test_env_path_dirs_list(path):
    env = Env(MYPATH=path, MYDIRS=path)
    assert path == env["MYPATH"].paths
    assert path == env["MYDIRS"].paths


@pytest.mark.parametrize(
    "path",
    [["/home/wakka" + os.pathsep + "/home/jawaka"], ["wakka" + os.pathsep + "jawaka"]],
)
def test_env_path_str(path):
    env = Env(MYPATH=path)
    assert path == env["MYPATH"].paths


def test_env_detype():
    env = Env(MYPATH=["wakka", "jawaka"])
    assert "wakka" + os.pathsep + "jawaka" == env.detype()["MYPATH"]


@pytest.mark.parametrize(
    "path1, path2",
    [(["/home/wakka", "/home/jawaka"], "/home/woah"), (["wakka", "jawaka"], "woah")],
)
def test_env_detype_mutable_access_clear(path1, path2):
    env = Env(MYPATH=path1)
    assert path1[0] + os.pathsep + path1[1] == env.detype()["MYPATH"]
    env["MYPATH"][0] = path2
    assert env._detyped is None
    assert path2 + os.pathsep + path1[1] == env.detype()["MYPATH"]


def test_env_detype_no_dict():
    env = Env(YO={"hey": 42})
    env.register("YO", validate=always_true, convert=None, detype=None)
    det = env.detype()
    assert "YO" not in det


def test_histcontrol_none():
    env = Env(HISTCONTROL=None)
    assert isinstance(env["HISTCONTROL"], set)
    assert len(env["HISTCONTROL"]) == 0


def test_HISTCONTROL_empty():
    env = Env(HISTCONTROL="")
    assert isinstance(env["HISTCONTROL"], set)
    assert len(env["HISTCONTROL"]) == 0


def test_histcontrol_ignoredups():
    env = Env(HISTCONTROL="ignoredups")
    assert isinstance(env["HISTCONTROL"], set)
    assert len(env["HISTCONTROL"]) == 1
    assert "ignoredups" in env["HISTCONTROL"]
    assert "ignoreerr" not in env["HISTCONTROL"]


def test_histcontrol_ignoreerr_ignoredups():
    env = Env(HISTCONTROL="ignoreerr,ignoredups,ignoreerr")
    assert len(env["HISTCONTROL"]) == 2
    assert "ignoreerr" in env["HISTCONTROL"]
    assert "ignoredups" in env["HISTCONTROL"]


def test_histcontrol_ignoreerr_ignoredups_erase_dups():
    env = Env(HISTCONTROL="ignoreerr,ignoredups,ignoreerr,erasedups")
    assert len(env["HISTCONTROL"]) == 3
    assert "ignoreerr" in env["HISTCONTROL"]
    assert "ignoredups" in env["HISTCONTROL"]
    assert "erasedups" in env["HISTCONTROL"]


def test_swap():
    env = Env(VAR="wakka")
    assert env["VAR"] == "wakka"

    # positional arg
    with env.swap({"VAR": "foo"}):
        assert env["VAR"] == "foo"

    # make sure the environment goes back outside the context manager
    assert env["VAR"] == "wakka"

    # kwargs only
    with env.swap(VAR1="foo", VAR2="bar"):
        assert env["VAR1"] == "foo"
        assert env["VAR2"] == "bar"

    # positional and kwargs
    with env.swap({"VAR3": "baz"}, VAR1="foo", VAR2="bar"):
        assert env["VAR1"] == "foo"
        assert env["VAR2"] == "bar"
        assert env["VAR3"] == "baz"

    # make sure the environment goes back outside the context manager
    assert env["VAR"] == "wakka"
    assert "VAR1" not in env
    assert "VAR2" not in env
    assert "VAR3" not in env


def test_swap_exception_replacement():
    env = Env(VAR="original value")
    try:
        with env.swap(VAR="inner value"):
            assert env["VAR"] == "inner value"
            raise Exception()
    except Exception:
        assert env["VAR"] == "original value"
    assert env["VAR"] == "original value"


def test_thread_local_swap():
    env = Env(a="orig")
    iter_count = 10
    num_threads = 4
    success_variables = [False] * (num_threads + 1)

    def loop(index, swapped_values=None):
        if swapped_values:
            if env["a"] != "orig":
                success_variables[index] = False
                return
            env.set_swapped_values(swapped_values)
        for _ in range(iter_count):
            if env["a"] != "swapped":
                success_variables[index] = False
                break
            with env.swap(a=index):
                sleep(0.01)
                if env["a"] == index:
                    success_variables[index] = True
                else:
                    success_variables[index] = False
                    break
            sleep(0.01)

    with env.swap(a="swapped"):
        threads = [
            Thread(target=loop, args=(i, env.get_swapped_values()))
            for i in range(1, num_threads + 1)
        ]
        for t in threads:
            t.start()
        loop(0)
    for t in threads:
        t.join()

    assert all(success_variables)


@skip_if_on_unix
def test_locate_binary_on_windows(xession):
    files = ("file1.exe", "FILE2.BAT", "file3.txt")
    with TemporaryDirectory() as tmpdir:
        tmpdir = os.path.realpath(tmpdir)
        for fname in files:
            fpath = os.path.join(tmpdir, fname)
            with open(fpath, "w") as f:
                f.write(fpath)
        xession.env.update({"PATH": [tmpdir], "PATHEXT": [".COM", ".EXE", ".BAT"]})
        assert locate_binary("file1") == os.path.join(tmpdir, "file1.exe")
        assert locate_binary("file1.exe") == os.path.join(tmpdir, "file1.exe")
        assert locate_binary("file2") == os.path.join(tmpdir, "FILE2.BAT")
        assert locate_binary("file2.bat") == os.path.join(tmpdir, "FILE2.BAT")
        assert locate_binary("file3") is None


def test_event_on_envvar_change(xession, env):
    env["TEST"] = 0
    share = []
    # register

    @xession.builtins.events.on_envvar_change
    def handler(name, oldvalue, newvalue, **kwargs):
        share.extend((name, oldvalue, newvalue))

    # trigger
    env["TEST"] = 1

    assert share == ["TEST", 0, 1]


def test_event_on_envvar_new(xession, env):
    share = []
    # register

    @xession.builtins.events.on_envvar_new
    def handler(name, value, **kwargs):
        share.extend((name, value))

    # trigger
    env["TEST"] = 1

    assert share == ["TEST", 1]


def test_event_on_envvar_change_from_none_value(xession, env):
    env["TEST"] = None
    share = []
    # register

    @xession.builtins.events.on_envvar_change
    def handler(name, oldvalue, newvalue, **kwargs):
        share.extend((name, oldvalue, newvalue))

    # trigger
    env["TEST"] = 1

    assert share == ["TEST", None, 1]


@pytest.mark.parametrize("val", [1, None, True, "ok"])
def test_event_on_envvar_change_no_fire_when_value_is_same(val, xession, env):
    env["TEST"] = val
    share = []
    # register

    @xession.builtins.events.on_envvar_change
    def handler(name, oldvalue, newvalue, **kwargs):
        share.extend((name, oldvalue, newvalue))

    # trigger
    env["TEST"] = val

    assert share == []


def test_events_on_envvar_called_in_right_order(xession, env):
    share = []
    # register

    @xession.builtins.events.on_envvar_new
    def handler(name, value, **kwargs):
        share[:] = ["new"]

    @xession.builtins.events.on_envvar_change
    def handler1(name, oldvalue, newvalue, **kwargs):
        share[:] = ["change"]

    # trigger new
    env["TEST"] = 1

    assert share == ["new"]

    # trigger change
    env["TEST"] = 2

    assert share == ["change"]


def test_no_lines_columns():
    os.environ["LINES"] = "spam"
    os.environ["COLUMNS"] = "eggs"
    try:
        env = default_env()
        assert "LINES" not in env
        assert "COLUMNS" not in env
    finally:
        del os.environ["LINES"]
        del os.environ["COLUMNS"]


def test_make_args_env():
    obs = make_args_env(["script", "1", "2", "3"])
    exp = {
        "ARGS": ["script", "1", "2", "3"],
        "ARG0": "script",
        "ARG1": "1",
        "ARG2": "2",
        "ARG3": "3",
    }
    assert exp == obs


def test_delitem():
    env = Env(VAR="a value")
    assert env["VAR"] == "a value"
    del env["VAR"]
    with pytest.raises(Exception):
        env["VAR"]


def test_delitem_default():
    env = Env()
    a_key, a_value = next(
        (k, v.default) for (k, v) in env._vars.items() if isinstance(v.default, str)
    )
    del env[a_key]
    assert env[a_key] == a_value
    del env[a_key]
    assert env[a_key] == a_value


def test_lscolors_target(xession):
    lsc = LsColors.fromstring("ln=target")
    assert lsc["ln"] == ("RESET",)
    assert lsc.is_target("ln")
    assert lsc.detype() == "ln=target"
    assert not (lsc.is_target("mi"))


@pytest.mark.parametrize(
    "key_in,old_in,new_in,test",
    [
        ("fi", ("RESET",), ("BLUE",), "existing key, change value"),
        ("fi", ("RESET",), ("RESET",), "existing key, no change in value"),
        ("tw", None, ("RESET",), "create new key"),
        ("pi", ("BACKGROUND_BLACK", "YELLOW"), None, "delete existing key"),
    ],
)
def test_lscolors_events(key_in, old_in, new_in, test, xession):
    lsc = LsColors.fromstring("fi=0:di=01;34:pi=40;33")
    # corresponding colors: [('RESET',), ('BOLD_CYAN',), ('BOLD_CYAN',), ('BACKGROUND_BLACK', 'YELLOW')]

    event_fired = False

    @xession.builtins.events.on_lscolors_change
    def handler(key, oldvalue, newvalue, **kwargs):
        nonlocal old_in, new_in, key_in, event_fired
        assert (
            key == key_in and oldvalue == old_in and newvalue == new_in
        ), "Old and new event values match"
        event_fired = True

    xession.env["LS_COLORS"] = lsc

    if new_in is None:
        lsc.pop(key_in, "argle")
    else:
        lsc[key_in] = new_in

    if old_in == new_in:
        assert not event_fired, "No event if value doesn't change"
    else:
        assert event_fired


def test_register_custom_var_generic():
    """Test that a registered envvar without any type is treated
    permissively.

    """
    env = Env()

    assert "MY_SPECIAL_VAR" not in env
    env.register("MY_SPECIAL_VAR")
    assert "MY_SPECIAL_VAR" in env

    env["MY_SPECIAL_VAR"] = 32
    assert env["MY_SPECIAL_VAR"] == 32

    env["MY_SPECIAL_VAR"] = True
    assert env["MY_SPECIAL_VAR"] is True


def test_register_custom_var_int():
    env = Env()
    env.register("MY_SPECIAL_VAR", type="int")

    env["MY_SPECIAL_VAR"] = "32"
    assert env["MY_SPECIAL_VAR"] == 32

    with pytest.raises(ValueError):
        env["MY_SPECIAL_VAR"] = "wakka"


def test_register_custom_var_float():
    env = Env()
    env.register("MY_SPECIAL_VAR", type="float")

    env["MY_SPECIAL_VAR"] = "27"
    assert env["MY_SPECIAL_VAR"] == 27.0

    with pytest.raises(ValueError):
        env["MY_SPECIAL_VAR"] = "wakka"


@pytest.mark.parametrize(
    "val,converted",
    [
        (True, True),
        (32, True),
        (0, False),
        (27.0, True),
        (None, False),
        ("lol", True),
        ("false", False),
        ("no", False),
    ],
)
def test_register_custom_var_bool(val, converted):
    env = Env()
    env.register("MY_SPECIAL_VAR", type="bool")

    env["MY_SPECIAL_VAR"] = val
    assert env["MY_SPECIAL_VAR"] == converted


@pytest.mark.parametrize(
    "val,converted",
    [
        (32, "32"),
        (0, "0"),
        (27.0, "27.0"),
        (None, ""),
        ("lol", "lol"),
        ("false", "false"),
        ("no", "no"),
    ],
)
def test_register_custom_var_str(val, converted):
    env = Env()
    env.register("MY_SPECIAL_VAR", type="str")

    env["MY_SPECIAL_VAR"] = val
    assert env["MY_SPECIAL_VAR"] == converted


def test_register_var_path():
    env = Env()
    env.register("MY_PATH_VAR", type="path")

    path = "/tmp"
    env["MY_PATH_VAR"] = path
    assert env["MY_PATH_VAR"] == pathlib.Path(path)

    # Empty string is None to avoid uncontrolled converting empty string to Path('.')
    path = ""
    env["MY_PATH_VAR"] = path
    assert env["MY_PATH_VAR"] is None

    with pytest.raises(TypeError):
        env["MY_PATH_VAR"] = 42


def test_register_custom_var_env_path():
    env = Env()
    env.register("MY_SPECIAL_VAR", type="env_path")

    paths = ["/home/wakka", "/home/wakka/bin"]
    env["MY_SPECIAL_VAR"] = paths

    assert hasattr(env["MY_SPECIAL_VAR"], "paths")
    assert env["MY_SPECIAL_VAR"].paths == paths

    with pytest.raises(TypeError):
        env["MY_SPECIAL_VAR"] = 32


def test_deregister_custom_var():
    env = Env()

    env.register("MY_SPECIAL_VAR", type="env_path")
    env.deregister("MY_SPECIAL_VAR")
    assert "MY_SPECIAL_VAR" not in env

    env.register("MY_SPECIAL_VAR", type="env_path")
    paths = ["/home/wakka", "/home/wakka/bin"]
    env["MY_SPECIAL_VAR"] = paths
    env.deregister("MY_SPECIAL_VAR")

    # deregistering a variable that has a value set doesn't
    # remove it from env;
    # the existing variable also maintains its type validation, conversion
    assert "MY_SPECIAL_VAR" in env
    with pytest.raises(TypeError):
        env["MY_SPECIAL_VAR"] = 32

    # removing, then re-adding the variable without registering
    # gives it only default permissive validation, conversion
    del env["MY_SPECIAL_VAR"]
    env["MY_SPECIAL_VAR"] = 32


def test_register_callable_default():
    def is_date(x):
        return isinstance(x, datetime.date)

    @default_value
    def today(env):
        return datetime.date.today()

    # registration should not raise a value error just because
    # default is a function which generates the proper type.
    env = Env()
    env.register("TODAY", default=today, validate=is_date)


def test_env_iterate():
    env = Env(TEST=0)
    env.register(re.compile("re"))
    for key in env:
        assert isinstance(key, str)


def test_env_iterate_rawkeys():
    env = Env(TEST=0)
    r = re.compile("re")
    env.register(r)
    saw_regex = False
    for key in env.rawkeys():
        if isinstance(key, str):
            continue
        elif isinstance(key, type(r)) and key.pattern == "re":
            saw_regex = True
    assert saw_regex


def test_env_get_defaults():
    """Verify the rather complex rules for env.get("<envvar>",default) value when envvar is not defined."""

    env = Env(TEST1=0)
    env.register("TEST_REG", default="abc")
    env.register("TEST_REG_DNG", default=DefaultNotGiven)

    # var is defined, registered is don't-care => value is defined value
    assert env.get("TEST1", 22) == 0
    # var not defined, not registered => value is immediate default
    assert env.get("TEST2", 22) == 22
    assert "TEST2" not in env
    # var not defined, is registered, reg default is not sentinel => value is *registered* default
    assert env.get("TEST_REG", 22) == "abc"
    assert "TEST_REG" in env
    # var not defined, is registered, reg default is sentinel => value is *immediate* default
    assert env.get("TEST_REG_DNG", 22) == 22
    assert "TEST_REG_DNG" not in env


@pytest.mark.parametrize(
    "val,validator",
    [
        ("string", "is_string"),
        (1, "is_int"),
        (0.5, "is_float"),
    ],
)
def test_var_with_default_initer(val, validator):
    var = Var.with_default(val)
    assert var.validate.__name__ == validator


def test_thread_local_dict():
    d = InternalEnvironDict()
    d["a"] = 1
    assert d["a"] == 1
    d.set_locally("a", 2)
    assert d["a"] == 2
    d.set_locally("a", 3)
    assert d["a"] == 3
    d["a"] = 4
    assert d["a"] == 4
    d.del_locally("a")
    assert d["a"] == 1
    d.set_locally("a", 5)
    assert d.pop("a") == 5
    assert d["a"] == 1
    d.set_locally("a", 6)
    assert d.popitem() == ("a", 6)
    assert d["a"] == 1
    assert d.pop("a", "nope") == 1
    assert d.pop("a", "nope") == "nope"
    assert "a" not in d


def test_thread_local_dict_multiple():
    d = InternalEnvironDict()
    num_threads = 5
    thread_values = [None] * num_threads

    def thread(i):
        d.set_locally("a", i**2)
        sleep(0.1)
        thread_values[i] = d["a"]
        sleep(0.1)
        d.del_locally("a")
        sleep(0.1)

    threads = [Thread(target=thread, args=(i,)) for i in range(num_threads)]
    shuffle(threads)
    for t in threads:
        t.start()
    for t in threads:
        t.join()

    assert thread_values == [i**2 for i in range(num_threads)]