Add _supported_features() #133
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sbidoul
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Not sure why this is red. Did I manage to unearth a flake8 bug ? |
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It looks like a flake8 update may have broken things: |
pep517/in_process/_in_process.py
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| for hook_name in sorted(HOOK_NAMES) | ||
| if hook_name != "_supported_hooks" and hasattr(backend, hook_name) |
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Because HOOK_NAMES is a set, we could use set arithmetic HOOK_NAMES - {"_supported_hooks"} to exclude this name. Up to you - I find code using sets pretty clear, but I know it's not to everyone's taste.
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I'm happy enough with this as a private fix for pip. One minor concern if we're one day going to make it a public API: most of the optional hooks have a specified fallback behaviour, which this library provides, so a frontend can call them without needing to know whether they're implemented or not. I don't know whether leaving them off a list of 'supported' hooks is good communication. I might be inclined to do something specific for build_editable, unless someone has a use case where checking the other hooks this way is useful. |
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How about _supported_features() that returns a list of strings. The only possible one for now being "build_editable" ? |
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I did that and constrained the flake8 version to workaround the issue. |
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@takluyver let me know if this is now good for you. Also as the next pip bugfix release will depend on a pep517 release, are there any pending blocker to such a release ? |
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@takluyver nudge. |
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That looks fine, thanks. |
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Released as 0.12. Sorry for the delay. |
Pip needs a mechanism to detect if build_editable is supported, in order to properly support legacy editable installs for projects that also have a pyproject.toml.
We provide the information with a
_supported_hookshook.Other frontends should normally not need this. Should it be the case, a proper mechanism to expose backend capabilities should standardized.
See pypa/pip#10577 (comment) for more information.