Crate useless_setter_maker 

Useless Setter Maker

A procedural macro crate for generating setter methods for Rust structs.

License

This project is licensed under the Apache 2.0 License. See the LICENSE file for details.

Examples

Builder setters

use useless_setter_maker::make_builder_setters;

#[make_builder_setters]
#[derive(Debug, PartialEq, Default)]
struct Config {
    #[builder_setter(prefix = "set", visibility = "pub")]
    host: String,
    
    #[builder_setter(suffix = "number", visibility = "pub(crate)")]
    port: u16,
    
    #[builder_setter(name = "enable_logging")]
    #[builder_setter(name = "install_logging")]
    logging: bool,
    
    #[disable_builder_setters]
    internal: bool,

    #[builder_setter(with_into = false)]
    updated_at: Option<String>,
}

let config = Config::default()
    .set_host("localhost")                    // Pub
    .with_number(8080 as u16)                 // Pub(crate)
    .enable_logging(true)                     // Pub, first logging setter  
    .install_logging(true)                    // Pub, second logging setter
    .with_updated_at(String::from("today"));  // Pub
    
assert_eq!(config.host, "localhost");
assert_eq!(config.port, 8080);
assert_eq!(config.logging, true);
assert_eq!(config.internal, false);
assert_eq!(config.updated_at, Some(String::from("today")));

Basic setters

use useless_setter_maker::make_basic_setters;

#[make_basic_setters]
#[derive(Debug, PartialEq, Default)]
struct Config {
    #[basic_setter(prefix = "with", visibility = "pub")]
    host: String,
    
    #[basic_setter(suffix = "number", visibility = "pub(crate)")]
    port: u16,
    
    #[basic_setter(name = "enable_logging")]
    #[basic_setter(name = "install_logging")]
    logging: bool,
    
    #[disable_basic_setters]
    internal: bool,

    #[basic_setter(with_into = false)]
    updated_at: Option<String>,
}

let mut config = Config::default();

config.with_host("localhost");                  // Pub
config.set_number(8080 as u16);                 // Pub(crate)
config.enable_logging(true);                    // Pub, first logging setter  
config.install_logging(true);                   // Pub, second logging setter
config.set_updated_at(String::from("today"));   // Pub
    
assert_eq!(config.host, "localhost");
assert_eq!(config.port, 8080);
assert_eq!(config.logging, true);
assert_eq!(config.internal, false);
assert_eq!(config.updated_at, Some(String::from("today")));

Attribute Macros

make_basic_setters

Generates basic setter methods for struct fields. Each setter follows the pattern <prefix>_<suffix> (default: set_<field_name>), accepts any type implementing Into<T> (where T is the field type), and returns a modified instance.

make_builder_setters

Generates builder-style setter methods for struct fields, enabling a fluent, chainable API for struct initialization. Each setter follows the pattern <prefix>_<suffix> (default: with_<field_name>), accepts any type implementing Into<T> (where T is the field type), and returns a modified instance.