text: # Software License Agreement (BSD License)
  #
  # Copyright (c) 2012, Willow Garage, Inc.
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions
  # are met:
  #
  #  * Redistributions of source code must retain the above copyright
  #    notice, this list of conditions and the following disclaimer.
  #  * Redistributions in binary form must reproduce the above
  #    copyright notice, this list of conditions and the following
  #    disclaimer in the documentation and/or other materials provided
  #    with the distribution.
  #  * Neither the name of Willow Garage, Inc. nor the names of its
  #    contributors may be used to endorse or promote products derived
  #    from this software without specific prior written permission.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  # FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  # COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  # BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  # POSSIBILITY OF SUCH DAMAGE.
  
  from __future__ import print_function
  
  import os
  
  CATKIN_MARKER_FILE = '.catkin'
  
  
  def get_workspaces():
      """
      Based on CMAKE_PREFIX_PATH return all catkin workspaces.
  
      :param _environ: environment module to use, ``dict``
      """
      # get all cmake prefix paths
      env_name = 'CMAKE_PREFIX_PATH'
      paths = [path for path in os.environ.get(env_name, '').split(os.pathsep) if path]
      # remove non-workspace paths
      workspaces = [path for path in paths if os.path.isfile(os.path.join(path, CATKIN_MARKER_FILE))]
      return workspaces
  
  
  def get_source_paths(workspace):
      """
      Read catkin workspace files and returns the list of all declared source paths.
  
      :param workspace: path to catkin workspace folder, ``str``
      """
      # determine source spaces
      filename = os.path.join(workspace, CATKIN_MARKER_FILE)
      if not os.path.isfile(filename):
          raise ValueError('Not a catkin workspace: "%s", missing file %s' % (workspace, filename))
      with open(filename) as f:
          data = f.read()
  
      source_paths = []
      if data != '':
          real_source_paths = set()
          for path in data.split(';'):
              real_path = os.path.realpath(path)
              if real_path not in real_source_paths:
                  source_paths.append(path)
                  real_source_paths.add(real_path)
      return source_paths
  