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joshuadavidthomasjoshuadavidthomas/django-language-server/.agents/skills/djls-ruff-ast/SKILL.md

djls-ruff-ast

Skill207 starsChanged yesterdayApache-2.0View on GitHub

Use when editing djls-extraction or Rust code that consumes Ruff Python AST APIs, including parse_module, parameters, boxed expressions, f-strings, or exception handlers. Handles known Ruff AST shape gotchas in django-language-server.

We split this skill into the rules it gives an agent

2 rules. About 0 are common, 0 are distinctive, and 2 are very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈0

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 2

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Very specific:

    Use this before editing djls-extraction or code that consumes Ruff Python AST nodes.

    line 8
  2. Very specific:

    Use let, not if let.

    line 19

≈ “Common” is an estimate: at least 1 in 5 of the 308,232 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

DJLS Ruff AST

Use this before editing djls-extraction or code that consumes Ruff Python AST nodes.

Known API shapes

  • Parse modules with ruff_python_parser::parse_module(source) and call .into_syntax() for ModModule AST.
  • Function defaults are per-parameter. There is no top-level defaults field.
    • Use ParameterWithDefault { parameter, default: Option<Box<Expr>> }.
  • StmtWhile.test, StmtIf.test, and similar fields are Box<Expr>.
    • Dereference with &* for pattern matching.
  • FStringValue uses .iter(), not .parts(), for FStringPart iteration.
  • ExceptHandler::ExceptHandler is irrefutable.
    • Use let, not if let.

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