Struct BuiltinRules 

pub struct BuiltinRules;

Collection of built-in codemod rules.

Implementations

impl BuiltinRules

pub fn all() -> Vec<CodemodRule>

Returns all built-in rules.

pub fn get(name: &str) -> Option<CodemodRule>

Get a built-in rule by name, or None if not found.

pub fn names() -> Vec<&'static str>

List the names of all available built-in rules.

pub fn replace_println_with_log() -> CodemodRule

Replace println! calls with log::info!.

This is one of the most common Rust codemods — switching from ad-hoc println! debugging to structured logging.

before: "println!($args)"
after:  "log::info!($args)"

pub fn replace_unwrap_with_expect() -> CodemodRule

Replace .unwrap() calls with .expect("descriptive message").

Bare .unwrap() calls produce unhelpful panic messages. This rule replaces them with .expect() so developers can add context.

before: "$expr.unwrap()"
after:  "$expr.expect(\"TODO: add error context\")"

pub fn replace_deprecated_trim() -> CodemodRule

Replace the deprecated trim_left() / trim_right() with trim_start() / trim_end() (Rust 1.30+).

before: "$s.trim_left()"
after:  "$s.trim_start()"