The loose consensus is that "fetch" doesn't have much meaning and that a
boolean flag makes more sense from the command line.
1. Adds `--allow-python-downloads` (hidden, default) and
`--no-python-downloads` to the CLI to quickly enable or disable
downloads
2. Deprecates `--python-fetch` in favor of the options from (1)
3. Removes `python-fetch` in favor of a `python-downloads` setting
5. Adds a `never` variant to the enum, allowing even explicit installs
to be disabled via the configuration file
## Test plan
I tested this with various `pyproject.toml`-level settings and `uv venv
--preview --python 3.12.2` and `uv python install 3.12.2` with and
without the new CLI flags.
This PR rewrites the resolver concept and adds a resolver internals page
targeted at power users.
The new resolution concept documentation has three parts:
* An introduction for people how never heard of "resolution" before, and
a motivating example what it does. I've also shoved the part about
equally valid resolutions in there.
* Features you commonly use: Non-universal vs. universal resolution,
lowest resolution amd pre-releases.
* Expert features, we don't advertise them, you'll only need them in
complex cases when you already know and i kept them to the reference
points you need in this case: Constraints, overrides and exclude-newer.
I intentionally didn't lay out any detail of the resolution itself, the
idea is that users get a vague sense of "uv has to select fitting
versions", but then they learn the options they have to use and some
common failure points without ever coming near SAT or even graphs.
The resolution internals reference page is targeted at power users who
need to understand what is going on behind the scenes. It assumes ample
prior knowledge and exists to explain the uv-specific behaviors for
someone who already understands dependency resolution conceptually and
has interacted with their dependency tree before. I had a section on the
lockfile but removed it because it found the lockfile to be too
self-documenting.
I haven't touched the readme.
Closes#5603Closes#5238Closes#5237
---------
Co-authored-by: Zanie Blue <contact@zanie.dev>
To enforce the 100 character line limit in markdown files introduced in
https://github.com/astral-sh/uv/pull/5635, and to automate the
formatting of markdown files, i've added prettier and formatted our
markdown files with it.
I've excluded the changelog and the generated references documentation
from this for having too many changes, but we can also include them.
I'm not particular on which style we use. My main motivations are
(major) not having to reflow markdown files myself anymore and (minor)
consistence between all markdown files. I've chosen prettier for similar
reason as we chose black, it's a single good style that's automated and
shared in the community. I do prefer prettier's style of not breaking
inside of a link name though.
This PR is in two parts, the first adds prettier to CI and documents
using it, while the second actually formats the docs. When merge
conflicts arise, we can drop the last commit and regenerate it with `npx
prettier --prose-wrap always --write BENCHMARKS.md CONTRIBUTING.md
README.md STYLE.md docs/*.md docs/concepts/**/*.md docs/guides/**/*.md
docs/pip/**/*.md`.
---------
Co-authored-by: Zanie Blue <contact@zanie.dev>
## Summary
This PR deprecates the `--isolated` flag. The treatment varies across
the APIs:
- For non-preview APIs, we warn but treat it as equivalent to
`--no-config`.
- For preview APIs, we warn and ignore it, with two exceptions...
- For `tool run` and `run` specifically, we don't even warn, because we
can't differentiate the command-specific `--isolated` from the global
`--isolated`.
