import os, stat

import re

import sys

import tempfile

tempprefix = 'hg-hghave-'

def matchoutput(cmd, regexp, ignorestatus=False):

    """Return True if cmd executes successfully and its output

    is matched by the supplied regular expression.

    """

    r = re.compile(regexp)

    fh = os.popen(cmd)

    s = fh.read()

    try:

        ret = fh.close()

    except IOError:

        # Happen in Windows test environment

        ret = 1

    return (ignorestatus or ret is None) and r.search(s)

def has_baz():

    return matchoutput('baz --version 2>&1', r'baz Bazaar version')

def has_bzr():

    try:

        import bzrlib

        return bzrlib.__doc__ is not None

    except ImportError:

        return False

def has_bzr114():

    try:

        import bzrlib

        return (bzrlib.__doc__ is not None

                and bzrlib.version_info[:2] >= (1, 14))

    except ImportError:

        return False

def has_cvs():

    re = r'Concurrent Versions System.*?server'

    return matchoutput('cvs --version 2>&1', re) and not has_msys()

def has_cvs112():

    re = r'Concurrent Versions System \(CVS\) 1.12.*?server'

    return matchoutput('cvs --version 2>&1', re) and not has_msys()

def has_darcs():

    return matchoutput('darcs --version', r'2\.[2-9]', True)

def has_mtn():

    return matchoutput('mtn --version', r'monotone', True) and not matchoutput(

        'mtn --version', r'monotone 0\.', True)

def has_eol_in_paths():

    try:

        fd, path = tempfile.mkstemp(dir='.', prefix=tempprefix, suffix='\n\r')

        os.close(fd)

        os.remove(path)

        return True

    except (IOError, OSError):

        return False

def has_executablebit():

    try:

        EXECFLAGS = stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH

        fh, fn = tempfile.mkstemp(dir='.', prefix=tempprefix)

        try:

            os.close(fh)

            m = os.stat(fn).st_mode & 0777

            new_file_has_exec = m & EXECFLAGS

            os.chmod(fn, m ^ EXECFLAGS)

            exec_flags_cannot_flip = ((os.stat(fn).st_mode & 0777) == m)

        finally:

            os.unlink(fn)

    except (IOError, OSError):

        # we don't care, the user probably won't be able to commit anyway

        return False

    return not (new_file_has_exec or exec_flags_cannot_flip)

def has_icasefs():

    # Stolen from mercurial.util

    fd, path = tempfile.mkstemp(dir='.', prefix=tempprefix)

    os.close(fd)

    try:

        s1 = os.stat(path)

        d, b = os.path.split(path)

        p2 = os.path.join(d, b.upper())

        if path == p2:

            p2 = os.path.join(d, b.lower())

        try:

            s2 = os.stat(p2)

            return s2 == s1

        except OSError:

            return False

    finally:

        os.remove(path)

def has_fifo():

    if getattr(os, "mkfifo", None) is None:

        return False

    name = tempfile.mktemp(dir='.', prefix=tempprefix)

    try:

        os.mkfifo(name)

        os.unlink(name)

        return True

    except OSError:

        return False

def has_killdaemons():

    return True

def has_cacheable_fs():

    from mercurial import util

    fd, path = tempfile.mkstemp(dir='.', prefix=tempprefix)

    os.close(fd)

    try:

        return util.cachestat(path).cacheable()

    finally:

        os.remove(path)

def has_lsprof():

    try:

        import _lsprof

        return True

    except ImportError:

        return False

def has_gettext():

    return matchoutput('msgfmt --version', 'GNU gettext-tools')

def has_git():

    return matchoutput('git --version 2>&1', r'^git version')

def has_docutils():

    try:

        from docutils.core import publish_cmdline

        return True

    except ImportError:

        return False

def getsvnversion():

    m = matchoutput('svn --version --quiet 2>&1', r'^(\d+)\.(\d+)')

    if not m:

        return (0, 0)

    return (int(m.group(1)), int(m.group(2)))

def has_svn15():

    return getsvnversion() >= (1, 5)

def has_svn13():

    return getsvnversion() >= (1, 3)

def has_svn():

    return matchoutput('svn --version 2>&1', r'^svn, version') and \

        matchoutput('svnadmin --version 2>&1', r'^svnadmin, version')

def has_svn_bindings():

    try:

        import svn.core

        version = svn.core.SVN_VER_MAJOR, svn.core.SVN_VER_MINOR

        if version < (1, 4):

            return False

        return True

    except ImportError:

        return False

def has_p4():

    return (matchoutput('p4 -V', r'Rev\. P4/') and

            matchoutput('p4d -V', r'Rev\. P4D/'))

def has_symlink():

    if getattr(os, "symlink", None) is None:

        return False

    name = tempfile.mktemp(dir='.', prefix=tempprefix)

    try:

        os.symlink(".", name)

        os.unlink(name)

        return True

    except (OSError, AttributeError):

        return False

def has_hardlink():

    from mercurial import util

    fh, fn = tempfile.mkstemp(dir='.', prefix=tempprefix)

    os.close(fh)

    name = tempfile.mktemp(dir='.', prefix=tempprefix)

    try:

        try:

            util.oslink(fn, name)

            os.unlink(name)

            return True

        except OSError:

            return False

    finally:

        os.unlink(fn)

def has_tla():

    return matchoutput('tla --version 2>&1', r'The GNU Arch Revision')

def has_gpg():

    return matchoutput('gpg --version 2>&1', r'GnuPG')

def has_unix_permissions():

    d = tempfile.mkdtemp(dir='.', prefix=tempprefix)

    try:

        fname = os.path.join(d, 'foo')

        for umask in (077, 007, 022):

            os.umask(umask)

            f = open(fname, 'w')

            f.close()

            mode = os.stat(fname).st_mode

            os.unlink(fname)

            if mode & 0777 != ~umask & 0666:

                return False

        return True

    finally:

        os.rmdir(d)

def has_root():

    return getattr(os, 'geteuid', None) and os.geteuid() == 0

def has_pyflakes():

    return matchoutput("sh -c \"echo 'import re' 2>&1 | pyflakes\"",

                       r"<stdin>:1: 're' imported but unused",

                       True)

def has_pygments():

    try:

        import pygments

        return True

    except ImportError:

        return False

def has_python243():

    return sys.version_info >= (2, 4, 3)

def has_outer_repo():

    # failing for other reasons than 'no repo' imply that there is a repo

    return not matchoutput('hg root 2>&1',

                           r'abort: no repository found', True)

def has_ssl():

    try:

        import ssl

        import OpenSSL

        OpenSSL.SSL.Context

        return True

    except ImportError:

        return False

def has_windows():

    return os.name == 'nt'

def has_system_sh():

    return os.name != 'nt'

def has_serve():

    return os.name != 'nt' # gross approximation

def has_test_repo():

    t = os.environ["TESTDIR"]

    return os.path.isdir(os.path.join(t, "..", ".hg"))

def has_tic():

    try:

        import curses

        curses.COLOR_BLUE

        return matchoutput('test -x "`which tic`"', '')

    except ImportError:

        return False

def has_msys():

    return os.getenv('MSYSTEM')

def has_aix():

    return sys.platform.startswith("aix")

def has_absimport():

    import __future__

    from mercurial import util

    return util.safehasattr(__future__, "absolute_import")

def has_py3k():

    return 3 == sys.version_info[0]