METADATA_BRANCH ?= "${@base_detect_branch(d)}"
METADATA_REVISION ?= "${@base_detect_revision(d)}"

def base_detect_revision(d):
    path = base_get_scmbasepath(d)

    scms = [base_get_metadata_git_revision, \
            base_get_metadata_svn_revision]

    for scm in scms:
        rev = scm(path, d)
        if rev != "<unknown>":
            return rev

    return "<unknown>"

def base_detect_branch(d):
    path = base_get_scmbasepath(d)

    scms = [base_get_metadata_git_branch]

    for scm in scms:
        rev = scm(path, d)
        if rev != "<unknown>":
            return rev.strip()

    return "<unknown>"

def base_get_scmbasepath(d):
    return d.getVar( 'COREBASE', True)

def base_get_metadata_monotone_branch(path, d):
    monotone_branch = "<unknown>"
    try:
        with open("%s/_MTN/options" % path) as f:
            monotone_branch = f.read().strip()
            if monotone_branch.startswith( "database" ):
                monotone_branch_words = monotone_branch.split()
                monotone_branch = monotone_branch_words[ monotone_branch_words.index( "branch" )+1][1:-1]
    except:
        pass
    return monotone_branch

def base_get_metadata_monotone_revision(path, d):
    monotone_revision = "<unknown>"
    try:
        with open("%s/_MTN/revision" % path) as f:
            monotone_revision = f.read().strip()
            if monotone_revision.startswith( "format_version" ):
                monotone_revision_words = monotone_revision.split()
                monotone_revision = monotone_revision_words[ monotone_revision_words.index( "old_revision" )+1][1:-1]
    except IOError:
        pass
    return monotone_revision

def base_get_metadata_svn_revision(path, d):
    # This only works with older subversion. For newer versions 
    # this function will need to be fixed by someone interested
    revision = "<unknown>"
    try:
        with open("%s/.svn/entries" % path) as f:
            revision = f.readlines()[3].strip()
    except (IOError, IndexError):
        pass
    return revision

def base_get_metadata_git_branch(path, d):
    branch = os.popen('cd %s; git branch 2>&1 | grep "^* " | tr -d "* "' % path).read()

    if len(branch) != 0:
        return branch
    return "<unknown>"

def base_get_metadata_git_revision(path, d):
    f = os.popen("cd %s; git log -n 1 --pretty=oneline -- 2>&1" % path)
    data = f.read()
    if f.close() is None:        
        rev = data.split(" ")[0]
        if len(rev) != 0:
            return rev
    return "<unknown>"

