from __future__ import absolute_import

import array

import errno

import fcntl

import os

import sys

from . import (

    encoding,

    pycompat,

    util,

)

# 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 = 'less'

def _rcfiles(path):

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

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

    try:

        rcs.extend([os.path.join(rcdir, f)

                    for f, kind in util.listdir(rcdir)

                    if f.endswith(".rc")])

    except OSError:

        pass

    return rcs

def systemrcpath():

    path = []

    if pycompat.sysplatform == 'plan9':

        root = 'lib/mercurial'

    else:

        root = '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 != '/':

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

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

    return path

def userrcpath():

    if pycompat.sysplatform == 'plan9':

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

    elif pycompat.isdarwin:

        return [os.path.expanduser('~/.hgrc')]

    else:

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

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

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

        return [os.path.expanduser('~/.hgrc'),

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

def termsize(ui):

    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, '\0' * 8)

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

            if width > 0 and height > 0:

                return width, height

        except ValueError:

            pass

        except IOError as e:

            if e[0] == errno.EINVAL:

                pass

            else:

                raise

    return 80, 24