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/usr/bin/catkin_topological_order is in catkin 0.7.4-4.

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#!/usr/bin/python

from __future__ import print_function
import argparse
import os
import sys

# find the import relatively if available to work before installing catkin or overlaying installed version
if os.path.exists(os.path.join(os.path.dirname(__file__), '..', 'python', 'catkin', '__init__.py')):
    sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', 'python'))
try:
    from catkin_pkg.topological_order import topological_order
except ImportError as e:
    sys.exit('ImportError: "from catkin_pkg.topological_order import topological_order" failed: %s\nMake sure that you have installed "catkin_pkg", it is up to date and on the PYTHONPATH.' % e)


def main():
    parser = argparse.ArgumentParser(description='Outputs the catkin projects of a workspace in topological order.')
    parser.add_argument('workspace', nargs='?', default='.', help='The path to a workspace (default: .)')
    parser.add_argument('--underlay-workspaces', nargs='*', default=[], help='The paths to underlay workspaces which are only used to resolve dependencies')
    parser.add_argument('--only-folders', action='store_true', help='Only output the project folders')
    parser.add_argument('--only-names', action='store_true', help='Only output the project names')
    args = parser.parse_args()

    # verify reasonable argument combination
    if args.only_folders and args.only_names:
        parser.error('Use either "--only-folders" or "--only-names" but not both')

    # verify that workspace folder exists
    workspace = os.path.abspath(args.workspace)
    if not os.path.isdir(workspace):
        sys.exit('Workspace "%s" does not exist' % workspace)

    ordered_projects = topological_order(workspace, underlay_workspaces=args.underlay_workspaces)
    if not ordered_projects:
        sys.stderr.write('Workspace "%s" seems to not contain any projects.'
                         ' Have you passed the correct path to a '
                         'catkin workspace?' % workspace)
        sys.exit(3)

    for (path, package) in ordered_projects:
        if path is None:
            sys.exit('The workspace contains packages with a circular dependency: %s' % package)

        if args.only_folders:
            print('%s' % path)
        elif args.only_names:
            print('%s' % package.name)
        else:
            print('%s %s' % (package.name, path))

if __name__ == '__main__':
    main()