rtk-ai/rtk

Add rtk clang-format filter (summarize reformatted files)

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#2,238 opened on Jun 3, 2026

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area:clienhancementhelp wantedpriority:medium

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Description

Summary

Add an rtk clang-format filter. clang-format -i is run across many files and its value to the model is essentially binary (which files changed / any errors), not the invocation echo.

Why

rtk discover flagged clang-format as an unhandled command: 52 invocations over 30 days (e.g. clang-format -i <files...>), with no RTK equivalent.

Suggested behavior

  • For -i (in-place): summarize to the list of files reformatted (or "no changes"), surface any parse/error output verbatim.
  • For --dry-run/--Werror: preserve the diagnostics, drop redundant per-file headers when clean.

Contributor guide

Research direction
Implement a filter that summarizes clang format i invocations by listing reformatted files or errors, and handles dry run/ Werror accordingly.
Tech stack
rust
Domain
clibackend
Issue type
Feature
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.
Half day
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
Rust
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60