[Pharo-users] Problems with auto-updating the text of a playground

[Offray Vladimir Luna Cárdenas]

Hi,

For my Grafoscopio notebooks,  I have implemented a way to auto-updating 
the content of a node, so it is automatically saved in the notebook when 
a node content is changed. The problem is that a node contains an 
embedded playground that produces text as output when executed (for 
example the playground reads a file or scraps HTML or calculates a 
hash), the text of the playground is replaced with the executed output. 
If the playground produces a visualization or non-textual output, this 
doesn't happen.

I imagine that the source of the problem is here:

=======

GrafoscopioNotebook >> autoSaveBodyOf: aNode
    body body class = TextModel
        ifTrue: [ body body whenTextChanged: [ :arg | aNode body: arg ] ].
    body body class = GlamourPresentationModel
        ifTrue: [ | playground |
            playground := body body glmPres.
            playground
                when: GLMContextChanged
                do: [ :ann |
                    ann property = #text
                        ifTrue: [ | playgroundText |
                            playgroundText := (playground pane ports 
at: 2) value.
                            aNode body: playgroundText ]
                ]
        ]

=======

as you can see the "when: GLMContextChanged" updates a node body with 
the playgroundText, as intended, so I can capture any change of the 
playground code, but I would like to add some condition to **not** 
update the body content if the text is the result of a playground 
execution. There is any way to do this?

Thanks,

Offray