请注意！这个crate仍然是不完整的！

Rust宏库，用于“不重复自己”

DRYlib是一个旨在减少重复代码数量的库。

Crates.io: https://crates.io/crates/drylib

请查看examples/clones.rs中的克隆宏示例

extern crate drylib;

use drylib::{clones, mutclones}; // Use the best library in the world

fn main() {
    // You can define variables that you want to clone:
    let digit = 2;
    let vector = vec![1, 2, 3];
    let string = "this is a string generated by the `clones`".to_owned();

    // And you can clone them with the `clones` macro:
    clones!(digit, vector, string); // Just type what variables you want to clone
    // The `clones` macro creates new variables using the following formula: 
    // format!({CLONES_PREFIX}{identifier(name) of the variable}).
    // By default CLONES_PREFIX is 'c', but you can specify it with following features:
    // [clones-prefix-c, clones-prefix-cl, and so on until clones-prefix-clone]
    // Select the one and prefixes will be appropriate.
    //
    // Therefore, the `clones` macro expands as follows:
    //
    // let cdigit = digit.clone();
    // let cvector = vector.clone();
    // let cstring = string.clone();

    // We can print them:
    println!("cdigit: {cdigit}, cvector: {cvector:?}, cstring: {cstring}");
    // This will print: cdigit: 2, cvector: [1, 2, 3], cstring: this is a string generated by the `clones`

    // By the way, you can use the `clones` macro specifying 
    // mutability of the variables that you want to clone as in here:
    clones!(mut digit, vector, mut string);
    // this one ^^^^^ and this one ^^^^^^ will be created as mutable variables, 
    // with the formula already described up above.
    //
    // This macro call expands as follows:
    //
    // let mut cdigit = digit.clone();
    // let cvector = vector.clone();
    // let mut cstring = string.clone();

    // The variables are mutable, so you can easily reassign them:
    cdigit = 4;
    cstring = "this is a mutable cloned string generated by the `clones` macro".to_owned();

    // And print:
    println!("cdigit: {cdigit}, cvector: {cvector:?}, cstring: {cstring}");
    // This will print: cdigit: 4, cvector: [1, 2, 3], cstring: this is a mutable cloned string generated by the `clones` macro

    // Here is another one, the `mutclones` macro, it does the same thing as the clones macro, 
    // but created variables are all mutable.
    mutclones!(digit, vector, string); // The `mutclones` macro expands in this code:
    //
    // let mut cdigit = digit.clone();
    // let mut cvector = vector.clone();
    // let mut cstring = string.clone();

    // The variables are mutable, therefore you can easily reassign them:
    cdigit = 4;
    cvector = vec![4, 5, 6];
    cstring = "this is a mutable cloned string generated by the `mutclones` macro".to_owned();

    // And print them:
    println!("cdigit: {cdigit}, cvector: {cvector:?}, cstring: {cstring}");
    // This will print: cdigit: 4, cvector: [4, 5, 6], cstring: this is a mutable cloned string generated by the `mutclones` macro
}

然后查看examples/structs.rs中的pubstruct宏示例

extern crate drylib; // Import the drylib library

use drylib::*; // Bring all of the macros from the drylib into scope

fn main() {
    //  <++++++++++++ Let's start with creating tuple structs  ++++++++++++>

    // You can create a pub tuple struct using the pubstruct macro like that:
    pubstruct!{
        #[derive(Debug)]
        Tuple(usize, i32, u32) // Define a tuple with types usize, i32, and u32
    };
    // This ^ will expand into this:
    // pub struct Tuple(pub usize, pub i32, pub u32);
    // So that's kinda the point of the macro, create pub struct with all of the fields
    // in it are public as well.

    let tuple = Tuple(0, 1, 2); // Let's create an instance of the Tuple
    println!("{tuple:?}");      // Prints: Tuple(0, 1, 2)

    // You can create a pub tuple struct with a generic type T as well:
    pubstruct!{
        #[derive(Debug)]
        TupleT<T>(T, i32, u32)
    };

    let tuple_t = TupleT(0, 1, 2);
    println!("{tuple_t:?}"); // Prints: TupleT(0, 1, 2)

    // Also you create a struct with a lifetime:
    pubstruct!{
        #[derive(Debug)]
        StructureLT<'a> {
            greet: &'a str,
            digit: i32,
        }
    }

    let structure_lt = StructureLT { greet: "hello again", digit: 1 };
    println!("{structure_lt:?}"); // Prints: StructureLT { greet: "hello again", digit: 1 }

    // Create a struct with both of generics and lifetimes, that's within your power as well:
    pubstruct!{
        #[derive(Debug)]
        StructureLTTU<'a, 'b, T, U> {
            greet: &'a T,
            array: &'b Vec<U>,
        }
    }
    // And this ^ expands like this:
    // pub struct StructureLTTU<'a, 'b, T, U> {
    //     pub greet: &'a T,
    //     pub array: &'b Vec<U>,
    // }

    let structure_lttu = StructureLTTU { greet: &"hello again", array: &vec![1, 2, 3] };
    println!("{structure_lttu:?}"); // Prints: StructureLTTU { greet: "hello again", array: [1, 2, 3] }
    // ... Continued in file examples/structs.rs
}

在这个库中，我们有很多方便的小宏，这只是其中的一部分。

我没有为所有这些创建示例，但你可以提交PR来帮助我。

未来会有更多的宏，这个库离最终版本还很远。