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use console::AnsiCodeIterator;
/// Expand tabs like an ANSI-enabled expand(1).
pub fn expand_tabs(line: &str, width: usize, cursor: &mut usize) -> String {
let mut buffer = String::with_capacity(line.len() * 2);
for chunk in AnsiCodeIterator::new(line) {
match chunk {
(text, true) => buffer.push_str(text),
(mut text, false) => {
while let Some(index) = text.find('\t') {
// Add previous text.
if index > 0 {
*cursor += index;
buffer.push_str(&text[0..index]);
}
// Add tab.
let spaces = width - (*cursor % width);
*cursor += spaces;
buffer.push_str(&*" ".repeat(spaces));
// Next.
text = &text[index + 1..text.len()];
}
*cursor += text.len();
buffer.push_str(text);
}
}
}
buffer
}
pub fn replace_nonprintable(input: &str, tab_width: usize) -> String {
let mut output = String::new();
let tab_width = if tab_width == 0 { 4 } else { tab_width };
for chr in input.chars() {
match chr {
// space
' ' => output.push('•'),
// tab
'\t' => {
if tab_width == 1 {
output.push('↹');
} else {
output.push('├');
output.push_str(&"─".repeat(tab_width - 2));
output.push('┤');
}
}
// line feed
'\x0A' => output.push('␊'),
// carriage return
'\x0D' => output.push('␍'),
// null
'\x00' => output.push('␀'),
// bell
'\x07' => output.push('␇'),
// backspace
'\x08' => output.push('␈'),
// escape
'\x1B' => output.push('␛'),
// anything else
_ => output.push(chr),
}
}
output
}