"""SCons.Tool.Perforce.py

Tool-specific initialization for Perforce Source Code Management system.

There normally shouldn't be any need to import this module directly.
It will usually be imported through the generic SCons.Tool.Tool()
selection method.

"""

# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014 The SCons Foundation
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__revision__ = "src/engine/SCons/Tool/Perforce.py  2014/03/02 14:18:15 garyo"

import os

import SCons.Action
import SCons.Builder
import SCons.Node.FS
import SCons.Util

# This function should maybe be moved to SCons.Util?
from SCons.Tool.PharLapCommon import addPathIfNotExists


# Variables that we want to import from the base OS environment.
_import_env = [ 'P4PORT', 'P4CLIENT', 'P4USER', 'USER', 'USERNAME', 'P4PASSWD',
                'P4CHARSET', 'P4LANGUAGE', 'SystemRoot' ]

PerforceAction = SCons.Action.Action('$P4COM', '$P4COMSTR')

def generate(env):
    """Add a Builder factory function and construction variables for
    Perforce to an Environment."""

    def PerforceFactory(env=env):
        """ """
        import SCons.Warnings as W
        W.warn(W.DeprecatedSourceCodeWarning, """The Perforce() factory is deprecated and there is no replacement.""")
        return SCons.Builder.Builder(action = PerforceAction, env = env)

    #setattr(env, 'Perforce', PerforceFactory)
    env.Perforce = PerforceFactory

    env['P4']      = 'p4'
    env['P4FLAGS'] = SCons.Util.CLVar('')
    env['P4COM']   = '$P4 $P4FLAGS sync $TARGET'
    try:
        environ = env['ENV']
    except KeyError:
        environ = {}
        env['ENV'] = environ

    # Perforce seems to use the PWD environment variable rather than
    # calling getcwd() for itself, which is odd.  If no PWD variable
    # is present, p4 WILL call getcwd, but this seems to cause problems
    # with good ol' Windows's tilde-mangling for long file names.
    environ['PWD'] = env.Dir('#').get_abspath()

    for var in _import_env:
        v = os.environ.get(var)
        if v:
            environ[var] = v

    if SCons.Util.can_read_reg:
        # If we can read the registry, add the path to Perforce to our environment.
        try:
            k=SCons.Util.RegOpenKeyEx(SCons.Util.hkey_mod.HKEY_LOCAL_MACHINE,
                                      'Software\\Perforce\\environment')
            val, tok = SCons.Util.RegQueryValueEx(k, 'P4INSTROOT')
            addPathIfNotExists(environ, 'PATH', val)
        except SCons.Util.RegError:
            # Can't detect where Perforce is, hope the user has it set in the
            # PATH.
            pass

def exists(env):
    return env.Detect('p4')

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