Lib.rs

Rust library: fraction_list_fmt_align

Formats a list of arbitrary fractional numbers (either string or f32/f64) so that they are correctly aligned when printed line by line. It also removes unnecessary zeroes. This means that it rather returns "7" instead of "7.000000".

Input

a) either a list of formatted fractional number strings

b) or a list of f32/f64

Example

# Input
"-42"
"0.3214"
"1000"
"-1000.2"
"2.00000"

# Output
"  -42     "
"    0.3214"
" 1000     "
"-1000.2   "
"    2     "

Use case

If you want to write multiple fraction numbers of different lengths to the terminal or a file in an aligned/formatted way.

Difference to std::fmt

• This is more flexible than println!()/format!() because it adjusts to a dynamic precision over multiple lines.
• This removes unnecessary zeroes, i.e. "0.000" will become "0"

How to use

use fraction_list_fmt_align::{fmt_align_fraction_strings, FractionNumber, fmt_align_fractions};

fn main() {
    let input_1 = vec![
        "-42",
        "0.3214",
        "1000",
        "-1000.2",
    ];
    let aligned_1 = fmt_align_fraction_strings(&input_1);
    println!("{:#?}", aligned_1);

    // or
    let input_2 = vec![
        FractionNumber::F32(-42.0),
        FractionNumber::F64(0.3214),
        FractionNumber::F64(1000.0),
        FractionNumber::F64(-1000.2),
    ];
    let max_precision = 4;
    let aligned_2 = fmt_align_fractions(&input_2, max_precision);
    println!("{:#?}", aligned_2);
}

MSRV

The MSRV is 1.56.1.