import array

import errno

import fcntl

import os

import sys

import typing

from typing import (

    List,

    Tuple,

)

from . import (

    encoding,

    pycompat,

    util,

)

if typing.TYPE_CHECKING:

    from . import ui as uimod

# BSD 'more' escapes ANSI color sequences by default. This can be disabled by

# $MORE variable, but there's no compatible option with Linux 'more'. Given

# OS X is widely used and most modern Unix systems would have 'less', setting

# 'less' as the default seems reasonable.

fallbackpager = b'less'

def _rcfiles(path: bytes) -> List[bytes]:

    rcs = [os.path.join(path, b'hgrc')]

    rcdir = os.path.join(path, b'hgrc.d')

    try:

        rcs.extend(

            [

                os.path.join(rcdir, f)

                for f, kind in sorted(util.listdir(rcdir))

                if f.endswith(b".rc")

            ]

        )

    except OSError:

        pass

    return rcs

def systemrcpath() -> List[bytes]:

    path = []

    if pycompat.sysplatform == b'plan9':

        root = b'lib/mercurial'

    else:

        root = b'etc/mercurial'

    # old mod_python does not set sys.argv

    if len(getattr(sys, 'argv', [])) > 0:

        p = os.path.dirname(os.path.dirname(pycompat.sysargv[0]))

        if p != b'/':

            path.extend(_rcfiles(os.path.join(p, root)))

    path.extend(_rcfiles(b'/' + root))

    return path

def userrcpath() -> List[bytes]:

    if pycompat.sysplatform == b'plan9':

        return [encoding.environ[b'home'] + b'/lib/hgrc']

    else:

        confighome = encoding.environ.get(b'XDG_CONFIG_HOME')

        if confighome is None or not os.path.isabs(confighome):

            confighome = os.path.expanduser(b'~/.config')

        return [

            os.path.expanduser(b'~/.hgrc'),

            os.path.join(confighome, b'hg', b'hgrc'),

        ]

def termsize(ui: "uimod.ui") -> Tuple[int, int]:

    try:

        import termios

        TIOCGWINSZ = termios.TIOCGWINSZ  # unavailable on IRIX (issue3449)

    except (AttributeError, ImportError):

        return 80, 24

    for dev in (ui.ferr, ui.fout, ui.fin):

        try:

            try:

                fd = dev.fileno()

            except AttributeError:

                continue

            if not os.isatty(fd):

                continue

            arri = fcntl.ioctl(fd, TIOCGWINSZ, b'\0' * 8)

            height, width = array.array('h', arri)[:2]

            if width > 0 and height > 0:

                return width, height

        except ValueError:

            pass

        except IOError as e:

            if e.errno == errno.EINVAL:

                pass

            else:

                raise

    return 80, 24