From https://github.com/moosetechnology/Moose/issues/1130 :

Right now, by default, a presentation constructor must be an annotated method which takes a composite (and optional context) as arguments, and configures a presentation.

For example:

gtInspectorStepsIn: composite <gtInspectorPresentationOrder: 10> composite list title: 'Steps'; display: [ self children ]

While this serves the basic purpose, I found myself continuously duplicating info which I had already described with Magritte, as in the description mirroring the above:

descriptionChildren <magritteDescription> ^ MAToManyRelationDescription new accessor: #children; label: 'Steps'; "..." yourself

So, playing around, I created the following general purpose hook to give more latitude in constructing presentations:

gtInspectorPresentationsIn: composite inContext: aGTInspector "..." eachPragma selector numArgs = 0 ifTrue: [ | configurationProvider | configurationProvider := self perform: eachPragma selector. configurationProvider gtPresentation cull: composite cull: aGTInspector cull: self ]. "..."

This enables you to get presentations almost for free by leaning on (in this case) Magritte. The Magritte description gets a slight upgrade:

descriptionChildren <magritteDescription> <gtInspectorPresentationOrder: 10> ^ MAToManyRelationDescription new accessor: #children; label: 'Steps'; "..." gtPresentation: [ :a | a list ]; yourself

#gtPresentation: sets default mappings, eliminating the original duplication:

gtPresentation: aBlock | wrapper | wrapper := [ :composite :context :subject | | presentation | presentation := aBlock cull: composite cull: context. presentation hasTitle ifFalse: [ presentation title: self label ]. presentation hasTransformation ifFalse: [ presentation display: (self accessor read: subject) ] ]. self propertyAt: #gtPresentation put: wrapper

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