textos 0.0.3

Texts, strings, formatting, unicode…
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// textos::unicode::string::counter

#[cfg(feature = "alloc")]
use alloc::string::{String, ToString};

/// Returns a [`String`] where you always know each character's position.
///
/// A [*counter string*][0] is a graduated string of arbitrary `length`,
/// with a `separator` positioned after the immediately preceding number.
///
/// ## Examples
///
/// ```
/// use textos::unicode::string::counter_string;
///
/// assert_eq!("2*4*6*8*11*14*", counter_string(14, '*'));
/// assert_eq!("_3_5_7_9_12_15_", counter_string(15, '_'));
/// ```
///
/// [0]: https://www.satisfice.com/blog/archives/22
#[cfg(feature = "alloc")]
#[cfg_attr(feature = "nightly", doc(cfg(feature = "alloc")))]
pub fn counter_string(mut length: usize, separator: char) -> String {
    let mut cstr = String::new();

    while length > 0 {
        let mut tmpstr = separator.to_string();
        tmpstr.push_str(&length.to_string().chars().rev().collect::<String>());

        if tmpstr.len() > length {
            tmpstr = tmpstr[..length].to_string();
        }

        cstr.push_str(&tmpstr);
        length -= tmpstr.len();
    }
    cstr.chars().rev().collect::<String>()
}