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"""
Common definitions for rospkg modules.
"""

MANIFEST_FILE = 'manifest.xml'
PACKAGE_FILE = 'package.xml'
STACK_FILE = 'stack.xml'
ROS_STACK = 'ros'


class ResourceNotFound(Exception):
    """
    A ROS filesystem resource was not found.
    """

    def __init__(self, msg, ros_paths=None):
        super(ResourceNotFound, self).__init__(msg)
        self.ros_paths = ros_paths

    def __str__(self):
        s = self.args[0]  # python 2.6
        if self.ros_paths:
            for i, p in enumerate(self.ros_paths):
                s = s + '\nROS path [%s]=%s' % (i, p)
        return s
