String interpolation macros for rust
Macros provided by this crate correspond to std's formatting macros (format,print, println, eprint, eprintln, ...).
You can use these macros just same as std's ones.
```rust use interpol::println;
let a = 3; let b = 4; println!("{a} times {b} is {a * b}."); // => "3 times 4 is 12." ```
It is also able to specify formatting option:
```rust let pi = 3.14; println!("{pi:.10}"); // => "3.1400000000" println!("{123:x}"); // => "7b"
let v = vec![1, 2, 3]; println!("{v:?}"); // => "[1, 2, 3]" ```
Correctly handles unicode characters:
rust
let world = "世界";
println!("ハロー {world}"); // => "ハロー 世界"
It is able to write expressions:
```rust println!("PI = {std::f64::consts::PI:.10}"); // => "PI = 3.1415926536"
println!("PI = { 1.0_f64.atan() * 4.0 :.10}"); // => "PI = 3.1415926536" ```
You can also write nested block expressions:
```rust println!("{ { let t = 123; t * t } }"); // => "15129"
println!("{{ let t = 123; t * t }}"); // "{{" and "}}" is escaped so the result is: // => "{ let t = 123; t * t }"
```