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Introduce a --fork-strategy preference mode (#9868)

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## Summary

This PR makes the behavior in https://github.com/astral-sh/uv/pull/9827
the default: we try to select the latest supported package version for
each supported Python version, but we still optimize for choosing fewer
versions when stratifying by platform.

However, you can opt out with `--fork-strategy fewest`.

Closes https://github.com/astral-sh/uv/issues/7190.
This commit is contained in:
Charlie Marsh 2024-12-13 16:05:07 -05:00 • committed by GitHub
parent 0ee21146f4
commit b2459e6326
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35 changed files with 699 additions and 48 deletions
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23
crates/uv-resolver/src/fork_strategy.rs Normal file
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#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, serde::Deserialize, serde::Serialize)]
#[serde(deny_unknown_fields, rename_all = "kebab-case")]
#[cfg_attr(feature = "clap", derive(clap::ValueEnum))]
#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
pub enum ForkStrategy {
/// Optimize for selecting the fewest number of versions for each package. Older versions may
/// be preferred if they are compatible with a wider range of supported Python versions or
/// platforms.
Fewest,
/// Optimize for selecting latest supported version of each package, for each supported Python
/// version.
#[default]
RequiresPython,
}
impl std::fmt::Display for ForkStrategy {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Self::Fewest => write!(f, "fewest"),
Self::RequiresPython => write!(f, "requires-python"),
}
}
}