Function format_node_detail

atomic-cli/src/commands/change/command.rs:677–716

Extract a human-readable one-liner from a provenance node's detail JSON. Returns `None` if the detail is empty or has no interesting fields.

(detail: &str)

///
/// Returns `None` if the detail is empty or has no interesting fields.
fn format_node_detail(detail: &str) -> Option<String> {
    let v: serde_json::Value = serde_json::from_str(detail).ok()?;
    let obj = v.as_object()?;

    // Command (bash/execution nodes)
    if let Some(cmd) = obj.get("command").and_then(|v| v.as_str()) {
        let truncated = if cmd.len() > 120 {
            format!("{}...", &cmd[..117])
        } else {
            cmd.to_string()
        };
        return Some(format!("$ {}", truncated));
    }

    // File path (read/write/edit nodes)
    if let Some(file) = obj
        .get("file")
        .or_else(|| obj.get("file_path"))
        .or_else(|| obj.get("target"))
        .and_then(|v| v.as_str())
    {
        let op = obj.get("operation").and_then(|v| v.as_str()).unwrap_or("");
        if op.is_empty() {
            return Some(file.to_string());
        }
        return Some(format!("{}: {}", op, file));
    }

    // Output summary (fallback for nodes with only output)
    if let Some(summary) = obj.get("output_summary").and_then(|v| v.as_str()) {
        let truncated = if summary.len() > 120 {
            format!("{}...", &summary[..117])
        } else {
            summary.to_string()
        };
        return Some(truncated);
    }

    None
}

impl Default for ChangeCmd {
    fn default() -> Self {