Function trim_selection

src/code_actions/extract_function.rs:803–822

Trim the selection to exclude leading/trailing whitespace and ensure it starts/ends on statement boundaries. Returns `(trimmed_start, trimmed_end)` or `None` if the trimmed selection is empty.

(content: &str, start: usize, end: usize)

/// Returns `(trimmed_start, trimmed_end)` or `None` if the trimmed
/// selection is empty.
fn trim_selection(content: &str, start: usize, end: usize) -> Option<(usize, usize)> {
    if start >= end || end > content.len() {
        return None;
    }

    let selected = &content[start..end];
    let trimmed = selected.trim();
    if trimmed.is_empty() {
        return None;
    }

    let trim_start = start + (selected.len() - selected.trim_start().len());
    let trim_end = end - (selected.len() - selected.trim_end().len());

    if trim_start >= trim_end {
        return None;
    }

    Some((trim_start, trim_end))
}

// ─── Indentation helpers ────────────────────────────────────────────────────