text: # Permission is hereby granted, free of charge, to any person obtaining
  # a copy of this software and associated documentation files (the
  # "Software"), to deal in the Software without restriction, including
  # without limitation the rights to use, copy, modify, merge, publish,
  # distribute, sublicense, and/or sell copies of the Software, and to
  # permit persons to whom the Software is furnished to do so, subject to
  # the following conditions:
  #
  # The above copyright notice and this permission notice shall be included
  # in all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
  # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
  # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  #
  
  import SCons.Builder
  import SCons.Tool
  from SCons.Errors import StopError
  
  import os
  
  def render_nbconvert_template(target, source, env):
      print(f'PATH: {os.environ["PATH"]}')
      dict = env.Dictionary().get('NBCONVERT_ENVIRONMENT_VARS')
      jupyter = 'jupyter nbconvert'
      for c in dict :
          if c == 'to' :            
              jupyter += f' --to {dict.get(c)}'
          elif c == 'flags' :
              for f in dict.get(c) :
                  jupyter += f' --{f}'
          else :
              jupyter += f' --{c}={dict.get(c)}'
      jupyter += ' --output=%s %s' % (target[0].abspath, source[0].abspath)
      env.Execute(jupyter)
  
      return None
  
  def generate(env):
  
      env.SetDefault(NBCONVERT_ENVIRONMENT_VARS={})
      env['BUILDERS']['nbconvert'] = SCons.Builder.Builder(
              action=render_nbconvert_template)
  
  def exists(env):
      try:
          import nbconvert
      except ImportError as e:
          raise StopError(ImportError, e.message) 
  