Easy access to struct fields in strings

🐠 add strung to the dependencies in the Cargo.toml:

[dependencies]
strung = "0.1"

🦀 use/import everything of the prelude in rust:

use strung::prelude::*;

🦊 works for unnamed fields:

#[derive(Strung)]
struct Struct (&'static str, u32);
fn main(){
    let s: String = Struct("Bob", 10).strung("{0} is {1}th"); 
}

🦊 works for named fields:

#[derive(Strung)]
struct Struct {
    name: &'static str,
    pos: u32,
}
fn main(){
    let s: String = Struct{name:"Bob", pos:10}.strung("{name} is {pos}th."); 
    // fields can also be addressed by their index
    let z: String = Struct{name:"Bob", pos:10}.strung("{0} is {1}th."); 
}

Ignore

🐳 use #[igno], #[ignore],#[strung(igno)] or #[strung(ignore)] to make a field unavailable
🦞 if a field type doesn't implement Display, it has to be ignored!

struct NoDisplay;
#[derive(Strung)]
struct Struct (&'static str, u32, #[igno] NoDisplay);
fn main(){
    let s: String = Struct("Bob", 10, NoDisplay)
        .strung("{0} is {1}th, he won {2}!"); 
}

Cascade

🐳 use #[cscd], #[cascade], #[strung(cscd)] or #[strung(cascade)] to cascade (recursion).
🐑 cascaded fields are ignored by default
🐔 use #[notice], #[ntce] or inside #[strung(..)] to make them available,

#[derive(Strung)]
struct Struct &'static str, u32);
#[derive(Strung)]
struct Cascade (u32, #[cscd] Struct);
fn main(){
    let s: String = Cascade(11,Struct("Bob", 10))
        .strung("{1.0} is {1.1}th for the {0}th time!"); 
    // => Bob is 10th for the 11th time!
}

Prefix and Postix Prefabs

🐈 5 different prefabs are provided:

#[derive(Strung)]
struct Struct (&'static str, u32);
fn main(){
    let t = Struct("Bob", 10);
    let s = t.strung_curly("{0} is {1}th."); 
    let s = t.strung_angle("<0> is <1>th."); 
    let s = t.strung_dollry("${0} is ${1}th."); 
    let s = t.strung_dollar("$0 is $1th."); 
    let s = t.strung_hashtag("#0 is #1th."); 
}

Custom Prefix and Postix

🦊 you can also customize pre-/postfixes in different ways
🦅 globally - using static variables and .strung_static(..):

#[derive(Strung)]
struct Struct (&'static str, u32);
fn main(){
    strung::set_static("<",">");
    let s: String = Struct("Bob", 10).strung_static("<0> is <1>th."); 
}

🐎 per struct - this overrides the default .strung(..) pre/postfix:

#[derive(Strung)]
#[strung("<",">")]
struct Struct (&'static str, u32);
fn main(){
    let s: String = Struct("Bob", 10).strung("<0> is <1>th."); 
}

🐍 per call - using parameters .strung_dynamic(pre,post,..):

#[derive(Strung)]
struct Struct (&'static str, u32);
fn main(){
    let s: String = Struct("Bob", 10).strung_dynamic("<",">","<0> is <1>th."); 
}

🦎 per call - using generic const chars .strung_generic::<pre,post>(..):

#[derive(Strung)]
struct Struct (&'static str, u32);
fn main(){
    let s: String = Struct("Bob", 10).strung_generic::<'<','>'>("<0> is <1>th."); 
}

Performance Comparison

🐕 dynamic/generic/global have equal runtime speed
🐇 default/prefabs/per-struct are faster!
🐁 Using a string of ~650 chracters and 6 field placeholders:

More Information

🦕 Documentation
🦎 Changelog
🐱 GitHub
👾 Discord Server

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License

^{Licensed under either of Apache License, Version 2.0 or MIT license at your option.}
_{Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.}