Files
ruff/python/ruff-ecosystem/README.md
Zanie Blue fc94857a20 Rewrite ecosystem checks and add ruff format reports (#8223)
Closes #7239 

- Refactors `scripts/check_ecosystem.py` into a new Python project at
`python/ruff-ecosystem`
- Includes
[documentation](https://github.com/astral-sh/ruff/blob/zanie/ecosystem-format/python/ruff-ecosystem/README.md)
now
    - Provides a `ruff-ecosystem` CLI
- Fixes bug where `ruff check` report included "fixable" summary line
- Adds truncation to `ruff check` reports
    - Otherwise we often won't see the `ruff format` reports
- The truncation uses some very simple heuristics and could be improved
in the future
- Identifies diagnostic changes that occur just because a violation's
fix available changes
- We still show the diff for the line because it's could matter _where_
this changes, but we could improve this
- Similarly, we could improve detection of diagnostic changes where just
the message changes
- Adds support for JSON ecosystem check output
    - I added this primarily for development purposes
- If there are no changes, only errors while processing projects, we
display a different summary message
- When caching repositories, we now checkout the requested ref
- Adds `ruff format` reports, which format with the baseline then the
use `format --diff` to generate a report
- Runs all CI jobs when the CI workflow is changed

## Known problems

- Since we must format the project to get a baseline, the permalink line
numbers do not exactly correspond to the correct range
- This looks... hard. I tried using `git diff` and some wonky hunk
matching to recover the original line numbers but it doesn't seem worth
it. I think we should probably commit the formatted changes to a fork or
something if we want great results here. Consequently, I've just used
the start line instead of a range for now.
- I don't love the comment structure — it'd be nice, perhaps, to have
separate headings for the linter and formatter.
- However, the `pr-comment` workflow is an absolute pain to change
because it runs _separately_ from this pull request so I if I want to
make edits to it I can only test it via manual workflow dispatch.
- Lines are not printed "as we go" which means they're all held in
memory, presumably this would be a problem for large-scale ecosystem
checks
- We are encountering a hard limit with the maximum comment length
supported by GitHub. We will need to move the bulk of the report
elsewhere.

## Future work

- Update `ruff-ecosystem` to support non-default projects and
`check_ecosystem_all.py` behavior
- Remove existing ecosystem check scripts
- Add preview mode toggle (#8076)
- Add a toggle for truncation
- Add hints for quick reproduction of runs locally
- Consider parsing JSON output of Ruff instead of using regex to parse
the text output
- Links to project repositories should use the commit hash we checked
against
- When caching repositories, we should pull the latest changes for the
ref
- Sort check diffs by path and rule code only (changes in messages
should not change order)
- Update check diffs to distinguish between new violations and changes
in messages
- Add "fix" diffs
- Remove existing formatter similarity reports
- On release pull request, compare to the previous tag instead

---------

Co-authored-by: konsti <konstin@mailbox.org>
2023-10-27 17:28:01 -05:00

47 lines
1.1 KiB
Markdown

# ruff-ecosystem
Compare lint and format results for two different ruff versions (e.g. main and a PR) on real world projects.
## Installation
From the Ruff project root, install with `pip`:
```shell
pip install -e ./python/ruff-ecosystem
```
## Usage
```shell
ruff-ecosystem <check | format> <baseline executable> <comparison executable>
```
Note executable paths may be absolute, relative to the current working directory, or will be looked up in the
current Python environment and PATH.
Run `ruff check` ecosystem checks comparing your debug build to your system Ruff:
```shell
ruff-ecosystem check ruff "./target/debug/ruff"
```
Run `ruff format` ecosystem checks comparing your debug build to your system Ruff:
```shell
ruff-ecosystem format ruff "./target/debug/ruff"
```
## Development
When developing, it can be useful to set the `--pdb` flag to drop into a debugger on failure:
```shell
ruff-ecosystem check ruff "./target/debug/ruff" --pdb
```
You can also provide a path to cache checkouts to speed up repeated runs:
```shell
ruff-ecosystem check ruff "./target/debug/ruff" --cache ./repos
```