As a user, I want to create patch-nodes, so that I can reuse program parts already composed in several places

[nkrkv]

Creating patch nodes is a most powerful way to evolve the user project and to extend the ecosystem. We should allow the user to create new nodes by combining existing.

A patch node implementation is a special kind of a patch that has unbound pins for inputs and/or outputs of the node as a whole.

The approximate user action steps are:

• I create a new patch
• I put a special input or output “pin” entity of given type on it
• I set its name via Inspector
• I connect it to other pins

After that, I have a ready-to-use new patch node.

The patch node should appear in a list of node types available for insertion. Nodes placed such way get the same label as a patch nodes’ patch name and input/output pins that are not bound on its implementation patch.

Story acceptance criteria

• A user can put unbound pins on a patch
• A user can give them names
• A user can link them to other pins utilizing common validation rules
• Such patch becomes patch node and gets added to available node types
• A user can place nodes of newly created type on other patches
• An attempt to change unbound pins on patch nodes already in use should bark on a user