Allow the prompt to be a Function
---------------------------------

                 Key: FELIX-3340
                 URL: https://issues.apache.org/jira/browse/FELIX-3340
             Project: Felix
          Issue Type: Improvement
          Components: Gogo Shell
    Affects Versions: gogo.shell-0.10.0
            Reporter: Felix Meschberger


It would be nice to have a dynamic command prompt such that for example the 
current working directory could be displayed:

  prompt = {
       dirname = ( ( cd ) name )
       "$dirname \$"
  }

To implement this, a prompt variable would be checked whether it is a Function 
and be executed if so using the result as the prompt.

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