First run/version migration about alfred-workflow HOT 9 CLOSED

Puh, this already sounds pretty advanced for a helper framework.
I don't think that there's a need for a migration system. I can't think of a scenario where I would really need to know about this.
Besides, I think its a good idea to clear the cache folder after upgrade by default. I haven't tested it yet, but aren't cache and settings deleted automatically after replacing a workflow with a new version?
Keeping settings might be useful but certainly raises the problem of incompatible versions.

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Certainly the data directory isn't cleared after an update. I think that would be bad form: all your settings gone.

Let's forget about the framework, but I do think the first_run boolean and last_version_run property would be useful: in most cases you wouldn't care if it's the first time v2.1.1 has run if the last version to run was v2.1.0, but you might if it was v1.7, as you may need to clear the caches and/or update the data.

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Alfred-Workflow could easily clear the caches right before an update is initiated. Developers would have to check their settings in their scripts if they have made changes. Providing a simple first_run() method would make it easier, but that's as far as it should go, right?

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It'd probably make more sense to have a last_version_run method/property. That'd give you a better idea of whether or not any update may be necessary:

>>> first_run = wf.first_run()
True
# what now?

>>> v = wf.last_version_run()
Version(1.7)
>>> if v < Version('2.0'):
    migrate_v1_to_v2()

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Sounds about right! :)

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Of course, it's dependent on some implementation of semantic versioning/version string parsing.

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True, I thought we already have agreed on semantic versioning for version 2? ;)

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We had. We have. It will be semantic, but won't implement the full standard because that's rather complex.

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Added in v1.10.1.

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