Function parse_existing_section

atomic-agent/src/learnings.rs:227–258

Parse the existing learnings section into a map of heading → list items. Returns a map like `{"### Repo" => ["- item1", "- item2"], "### Workflow" => ["- tip"]}`. Returns an empty map if no section exists.

(content: &str)

/// Returns a map like `{"### Repo" => ["- item1", "- item2"], "### Workflow" => ["- tip"]}`.
/// Returns an empty map if no section exists.
fn parse_existing_section(content: &str) -> HashMap<String, Vec<String>> {
    let mut sections: HashMap<String, Vec<String>> = HashMap::new();

    let start_idx = match content.find(SECTION_START) {
        Some(idx) => idx + SECTION_START.len(),
        None => return sections,
    };

    let end_idx = match content[start_idx..].find(SECTION_END) {
        Some(idx) => start_idx + idx,
        None => return sections,
    };

    let section_text = &content[start_idx..end_idx];
    let mut current_heading: Option<String> = None;

    for line in section_text.lines() {
        let trimmed = line.trim();
        if trimmed.starts_with("### ") {
            current_heading = Some(trimmed.to_string());
        } else if trimmed.starts_with("- ") {
            if let Some(ref heading) = current_heading {
                sections
                    .entry(heading.clone())
                    .or_default()
                    .push(trimmed.to_string());
            }
        }
    }

    sections
}

/// Collect all existing learning lines (flat list) for dedup checking.
fn read_existing_learnings(content: &str) -> Vec<String> {