Function detect_line_indent

src/code_actions/extract_function.rs:830–835

Detect the indentation of the line containing the given offset. Returns only the leading whitespace of that line, without adding an extra indent level.

(content: &str, offset: usize)

/// Returns only the leading whitespace of that line, without adding
/// an extra indent level.
fn detect_line_indent(content: &str, offset: usize) -> String {
    let before = &content[..offset];
    let line_start = before.rfind('\n').map_or(0, |p| p + 1);
    let line = &content[line_start..offset];
    line.chars().take_while(|c| c.is_whitespace()).collect()
}

/// Detect whether the file uses tabs or spaces (and how many spaces).
fn detect_indent_unit(content: &str) -> &str {