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Correctly render tab stops

This commit is contained in:
Patrick Hilhorst 2022-01-20 14:35:25 +01:00 committed by David Peter
parent cde239e809
commit da5921b4a9
1 changed files with 9 additions and 3 deletions
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12
src/preprocessor.rs
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@ -53,26 +53,32 @@ pub fn replace_nonprintable(input: &[u8], tab_width: usize) -> String {
let tab_width = if tab_width == 0 { 4 } else { tab_width };
let mut idx = 0;
let mut line_idx = 0;
let len = input.len();
while idx < len {
if let Some((chr, skip_ahead)) = try_parse_utf8_char(&input[idx..]) {
idx += skip_ahead;
line_idx += 1;
match chr {
// space
' ' => output.push('·'),
// tab
'\t' => {
if tab_width == 1 {
let tab_stop = tab_width - ((line_idx - 1) % tab_width);
if tab_stop == 1 {
output.push('↹');
} else {
output.push('├');
output.push_str(&"─".repeat(tab_width - 2));
output.push_str(&"─".repeat(tab_stop - 2));
output.push('┤');
}
}
// line feed
'\x0A' => output.push_str("␊\x0A"),
'\x0A' => {
output.push_str("␊\x0A");
line_idx = 0;
}
// carriage return
'\x0D' => output.push('␍'),
// null