tweag/ormolu
Some data may be outdated — see provenance labels.
A formatter for Haskell source code observed · 2026-10-01
Health v2 · maintenance only
84/100
- Activity 97
- Release rhythm 57
- Longevity 100
Flags: no_license
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-10-21. Adoption (stars, forks) is never an input.
- gap_med: 121.5
- age_days: 2886
- days_rel: 127
- days_push: 20
- n_releases_24m: 5
Adoption not part of the score
1073 stars · 91 forks observed · 2026-10-01
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
Ormolu is a formatter for Haskell source code that uses GHC's own parser and enforces a single, unconfigurable formatting style with minimal diffs and idempotent output. It ships as a CLI tool, a library, and a browser-based playground (Ormolu Live) compiled to WASM.
Use cases
- format haskell source code
- enforce consistent haskell code style across a project
- check haskell formatting in CI
- format haskell code in the browser
- integrate haskell formatting into an editor
- reformat haskell code with minimal diffs
When to choose
- you want one canonical Haskell style with no configuration debates
- you need a formatter that handles modern GHC language extensions reliably
- you want idempotent formatting suitable for large codebases and CI checks
When to avoid
- you need configurable formatting options or multiple style presets
- you want a formatter for languages other than Haskell
- you prefer a style that preserves your existing whitespace choices entirely
Facets
cli-tool · maturity active
formatter cli parser developer-tools programming-languages windows cli wasm haskell code-style idempotent-formatting ghc-parser command-line linux macos
2 sources
- readme: https://github.com/tweag/ormolu · fetched 2026-10-01 · 55acdbc6e055
- homepage: https://ormolu-live.tweag.io · fetched 2026-08-29 · 375f8c32e649
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| tweag/ormolu | main | 84 |
For agents
Data as of 2026-10-19T08:05:51.212177+00:00 · Report a problem