astral-sh/ruff

Ruff extension does not respect lines-after-imports from ruff.toml

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#17558 opened on Apr 15, 2025

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 (6 comments) (0 reactions) (0 assignees)Rust (47,527 stars) (2,088 forks)batch import
documentationformatterhelp wantedincompatibilityisort

Description

For a ruff.toml file at the root of my repo:

line-length = 120
target-version = "py311"
[lint.isort]
lines-after-imports = 1

... it appears that the setting to use a single line after the imports is ignored by the extension, resulting in the file that is formatted on save having errors according to the command line tool

I am fairly sure the file is being loaded because I am able to change the line-length parameter, restart the extension, and see matching fixes being applied.

Contributor guide

Tech stack
pythonrust
Domain
toolingdeveloper experience
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Basic understanding of Ruff configurationFamiliarity with VS Code extension debugging
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Investigate the Ruff VS Code extension's handling of `ruff.toml` settings. Focus on the mapping of isort options, specifically `lines after imports`, between the configuration file and the LSP server. Check the extension's source code in the `astral sh/ruff vscode` repository for where settings are parsed. Look for any recent changes or known limitations. Engage with the issue comments to see if a maintainer has provided additional guidance.