Function simplify

src/simplify.rs:115–160

Simplify message text for chat display. Remove quotes, signatures, trailing empty lines etc.

(mut input: String, is_chat_message: bool)

/// Simplify message text for chat display.
/// Remove quotes, signatures, trailing empty lines etc.
pub(crate) fn simplify(mut input: String, is_chat_message: bool) -> SimplifiedText {
    let mut is_cut = false;

    input.retain(|c| c != '\r');
    let lines = split_lines(&input);
    let (lines, is_forwarded) = skip_forward_header(&lines);

    let (lines, mut top_quote) = remove_top_quote(lines, is_chat_message);
    let original_lines = &lines;
    let (lines, footer_lines) = remove_message_footer(lines);
    let footer = footer_lines.map(|footer_lines| render_message(footer_lines, false));

    let text = if is_chat_message {
        render_message(lines, false)
    } else {
        let (lines, has_nonstandard_footer) = remove_nonstandard_footer(lines);
        let (lines, mut bottom_quote) = remove_bottom_quote(lines);

        if top_quote.is_none() && bottom_quote.is_some() {
            std::mem::swap(&mut top_quote, &mut bottom_quote);
        }

        if lines.iter().all(|it| it.trim().is_empty()) {
            render_message(original_lines, false)
        } else {
            is_cut = is_cut || has_nonstandard_footer || bottom_quote.is_some();
            render_message(lines, has_nonstandard_footer || bottom_quote.is_some())
        }
    };

    if !is_chat_message {
        top_quote = top_quote.map(|quote| {
            let (quote, quote_cut) = simplify_quote(&quote);
            is_cut |= quote_cut;
            quote
        });
    }

    SimplifiedText {
        text,
        is_forwarded,
        is_cut,
        top_quote,
        footer,
    }
}

/// Skips "forwarded message" header.
/// Returns message body lines and a boolean indicating whether