Function frontmatter_string

atomic-cli/src/commands/vault/context.rs:697–703

(frontmatter_json: &str, keys: &[&str])

}

fn frontmatter_string(frontmatter_json: &str, keys: &[&str]) -> Option<String> {
    let value = serde_json::from_str::<serde_json::Value>(frontmatter_json).ok()?;
    keys.iter()
        .find_map(|key| value.get(key).and_then(|item| item.as_str()))
        .filter(|item| !item.is_empty())
        .map(String::from)
}

/// Extract `labels` (array of strings) from frontmatter JSON.
fn frontmatter_labels(frontmatter_json: &str) -> Vec<String> {