muda 0.20.0

Menu Utilities for Desktop Applications
Documentation 
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// Copyright 2022-2022 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT

/// Converts from muda mnemonic to gtk mnemonic
///
/// gtk uses underline (_) for mnemonic
/// and two underlines (__) to escape it into a single underline
/// while we use (&) and (&&), so we have to do a few conversions
pub fn to_gtk_mnemonic<S: AsRef<str>>(string: S) -> String {
    let string = string.as_ref();
    let mut converted = String::with_capacity(string.len());
    let mut characters = string.chars().peekable();

    while let Some(character) = characters.next() {
        match character {
            '_' => converted.push_str("__"),
            '&' if characters.peek() == Some(&'&') => {
                characters.next();
                converted.push('&');
            }
            '&' => converted.push('_'),
            _ => converted.push(character),
        }
    }

    converted
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn it_converts() {
        assert_eq!(to_gtk_mnemonic("H&ello"), "H_ello");
        assert_eq!(to_gtk_mnemonic("H&&ello"), "H&ello");
        assert_eq!(to_gtk_mnemonic("H&&&ello"), "H&_ello");
        assert_eq!(to_gtk_mnemonic("H_ello"), "H__ello");
        assert_eq!(to_gtk_mnemonic("H__ello"), "H____ello");
        assert_eq!(to_gtk_mnemonic("[~~]"), "[~~]");
    }
}