Resyntax🔗ℹ

Resyntax is a refactoring tool for Racket. The tool can be guided by refactoring rules, which are macro-like functions defined in terms of syntax-parse that specify how to search for and refactor different coding patterns. Resyntax comes with a standard set of refactoring rules that improve code written in #lang racket or #lang racket/base. For example, consider the following program:

"my-program.rkt"

#lang racket/base

(define (swap x y)

(let ([t (unbox x)])

(set-box! x (unbox y))

(set-box! y t)))

This program uses let unnecessarily. The let expression can be replaced with a define form, reducing the indentation of the code. Resyntax is capable of detecting and automatically fixing this issue. Running resyntax fix --file my-program.rkt rewrites the above to the following:

"my-program.rkt"

#lang racket/base

(define (swap x y)

(define t (unbox x))

(set-box! x (unbox y))

(set-box! y t))

To see a list of suggestions that Resyntax would apply, use resyntax analyze instead of resyntax fix. Each suggestion includes an explanation of why the change is being recommended.