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Split preview mode into separate feature flags (#14823)

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I think this would give us better hygiene than a global flag. It makes
it easier for users to opt-in to overlapping features, such as Python
upgrades and Python bin installations and to disable warnings for
preview mode without opting in to a bunch of other features. In general,
I want to reduce the burden for putting something under preview.

The `--preview` and `--no-preview` flags are retained as global
overrides. A new `--preview-features` option is added which accepts
comma separated features or can be passed multiple times, e.g.,
`--preview-features add-bounds,pylock`. There's a `UV_PREVIEW_FEATURES`
environment variable for that option (I'm not sure if we should overload
`UV_PREVIEW`, but could be convinced).
This commit is contained in:
Zanie Blue 2025-07-25 11:01:57 -05:00 • committed by GitHub
parent 9376cf5482
commit bfb4bc2aeb
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4
crates/uv-tool/src/lib.rs
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@ -1,7 +1,7 @@
use core::fmt;
use fs_err as fs;
use uv_configuration::PreviewMode;
use uv_configuration::Preview;
use uv_dirs::user_executable_directory;
use uv_pep440::Version;
use uv_pep508::{InvalidNameError, PackageName};
@ -258,7 +258,7 @@ impl InstalledTools {
&self,
name: &PackageName,
interpreter: Interpreter,
preview: PreviewMode,
preview: Preview,
) -> Result<PythonEnvironment, Error> {
let environment_path = self.tool_dir(name);