Function emit

atomic-cli/src/agent_error.rs:237–264

Render one escaped `key: value` record per line. Empty strings are quoted so an explicitly empty argument stays distinct from an absent record. Quotes are escaped for the same reason.

(kv: &[(&str, String)])

/// Empty strings are quoted so an explicitly empty argument stays distinct
/// from an absent record. Quotes are escaped for the same reason.
fn emit(kv: &[(&str, String)]) -> String {
    use std::fmt::Write as _;

    let mut out = String::new();
    for (key, value) in kv {
        out.push_str(key);
        out.push_str(": ");
        if value.is_empty() {
            out.push_str("\"\"\n");
            continue;
        }
        for ch in value.chars() {
            match ch {
                '\\' => out.push_str("\\\\"),
                '"' => out.push_str("\\\""),
                '\n' => out.push_str("\\n"),
                '\r' => out.push_str("\\r"),
                '\t' => out.push_str("\\t"),
                ch if ch.is_control() || is_invisible_format(ch) => {
                    let _ = write!(out, "\\u{{{:x}}}", ch as u32);
                }
                ch => out.push(ch),
            }
        }
        out.push('\n');
    }
    out
}

/// Characters that can alter visual order or create invisible ambiguity while
/// remaining legal Unicode. Keep ordinary non-ASCII text readable.