gleam-lang/gleam

Extract record code action

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#4,406 opened on Mar 29, 2025

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 (1 comment) (2 reactions) (0 assignees)Rust (960 forks)batch import
help wanted

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Description

Given a type definition, if some of the fields of one of the variants are selected then a code action if offered to extract them into a new custom type.

pub type NewsPost {
  NewsPost(
    title: String,
    subtitle: String,
    published: calendar.Date,
// Selection start
    author_name: String,
    author_url: String,
// Selection end
  )
}

Could become

pub type NewsPost {
  NewsPost(
    title: String,
    subtitle: String,
    published: calendar.Date,
    author: Author,
  )
}

pub type Author {
  Author(name: String, url: String)
}

Here I've gone for an idealised version that determines ideal names for the fields, but it would still be useful even if it is not able to do this. The original field labels and a placeholder type + variant name could be used.

Contributor guide

Research direction
Study existing code actions in the Gleam language server (e.g., in compiler core/lsp/src/actions/) and implement a new action that parses the selected field range, generates a new type and variant, and provides edits to replace the selected fields with the new type.
Tech stack
rust
Domain
tooling
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.
1-2 days
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
RustGleam
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30