Function parse_flags

nodedb/src/ctl/args.rs:28–49

Parse a list of `--key [value]` arguments into a map. Each `--flag` is consumed as: - **key-value** when the next token exists and does not start with `--` - **boolean** (stored with value `""`) when the next token is absent or starts with `--` Repeated flags overwrite. Returns an error for unrecognised tokens (positional args, single-dash shortflags) so operators get a clear message instead of

(args: &[String])

/// (positional args, single-dash shortflags) so operators get a clear
/// message instead of silent ignore.
pub fn parse_flags(args: &[String]) -> Result<HashMap<String, String>, String> {
    let mut map = HashMap::new();
    let mut i = 0;
    while i < args.len() {
        let a = &args[i];
        if let Some(name) = a.strip_prefix("--") {
            let next = args.get(i + 1);
            let is_value = next.is_some_and(|n| !n.starts_with("--"));
            if is_value {
                map.insert(name.to_string(), next.unwrap().clone());
                i += 2;
            } else {
                // Boolean flag — no value token follows.
                map.insert(name.to_string(), String::new());
                i += 1;
            }
        } else {
            return Err(format!("unexpected argument: {a}"));
        }
    }
    Ok(map)
}

/// Return `true` if a boolean (value-less) flag is present in `args`.
///