Make `--model` parameter of host application more flexible about fornjot HOT 5 CLOSED

edit: Incorporated this comment into the issue description above.

In case anyone wants to look into this:

• The argument is specified in args.rs.
• The argument is then used in model.rs.

I think it would make sense to add the logic I described here in model.rs.

from fornjot.

The issue description specifies "falling back to the current behavior", if all else fails. #123 is relevant here, as it would make said current behavior more sane.

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Updated the issue description to make it more clear what can be done to address this issue.

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I'm working on this.

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I've looked into this, and it has turned out to be surprisingly difficult. The problem is, a model looks like any other Cargo package, so determining whether there is a model in the current directory isn't straight-forward. This could be solved by adding a special file to model directories, or special metadata to the Cargo.toml of models, but that's more complication for the user. I don't think that's worth it right now.

How models look is an area that is going to change a lot in the future, with the planned move to WASM (#71) and support for more modeling languages. Once that has settled down somewhat, I think it's worth revisiting this issue. For now, I've added it to the feature wishlist.

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