Support #[from_str(rename_all = "...")] attribute (#216)
#467
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@JelteF this PR has grown a little bit too much than I've expected, so I've dissected some of its logical parts into separate PRs to keep things simpler:
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# Conflicts: # impl/src/from_str.rs # tests/from_str.rs
# Conflicts: # impl/src/from_str.rs
tyranron
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May 13, 2025
Required for #467 Requires #468 ## Synopsis We support flat structs for `Display`: ```rust #[derive(Display)] struct Foo; ``` But `FromStr` doesn't support it. ## Solution Allow using `#[derive(FromStr)]` on structs with no fields. Similarly to enums it will use fuzzy matching. Exact matching would be possible to enable in #469 by using `#[from_str(rename_all = "...")]` attribute.
# Conflicts: # impl/src/from_str.rs
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Resolves #216
Requires #468, #469
Synopsis
We have
#[display(rename_all = "...")]attribute for flat enums. The counterpart forFromStrderive is missing.Solution
This PR adds support
#[from_str(rename_all = "...")]attribute on enums. Once this attribute is specified, the matching is always exact (for now, by default, matching could be fuzzy if there is no similarly named variants).Additionally
This PR fully reworks
FromStrderive implementation to avoid using oldutilsmachinery.Adds support for unit structs (like
struct Unit;) for the counterpart behavior ofDisplay.Adds
tests/compile_fail/from_str.Checklist