request: optimise single-character groups into a single character

[kyranet]

If a single (or group of duplicated characters) entry is wrapped inside [], e.g. [e] or [ee], it should check whether or not the group has one character, and if it does, create a WordPart::Single instead.

word-match/src/word.rs

Lines 70 to 98 in 8ceb4f2

	GROUP_START => {
	// Found '['
	let mut group: Vec<char> = Vec::new();
	loop {
	match chars.next() {
	// If ']' is found, it is the end of the Group
	Some(GROUP_END) => {
	break;
	}
	// If '\' is found, it is an escape character, read the next character
	Some(ESCAPE) => {
	if let Some(c) = chars.next() {
	group.push(c);
	}
	}
	// If a character is found, add it to the Group
	Some(c) => {
	if !group.contains(&c) {
	group.push(c);
	}
	}
	// If the end of the word is reached, return an error
	None => {
	return Err(Error::new(Status::GenericFailure, "Unterminated character group"));
	}
	}
	}
	WordPart::Group(group)