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use super::core::display_width;
#[derive(Debug)]
pub(crate) struct LineWrapper<'w> {
hard_width: usize,
line_width: usize,
carryover: Option<&'w str>,
}
impl<'w> LineWrapper<'w> {
pub(crate) fn new(hard_width: usize) -> Self {
Self {
hard_width,
line_width: 0,
carryover: None,
}
}
pub(crate) fn reset(&mut self) {
self.line_width = 0;
self.carryover = None;
}
pub(crate) fn wrap(&mut self, mut words: Vec<&'w str>) -> Vec<&'w str> {
if self.carryover.is_none() {
if let Some(word) = words.first() {
if word.trim().is_empty() {
self.carryover = Some(*word);
} else {
self.carryover = Some("");
}
}
}
let mut i = 0;
while i < words.len() {
let word = &words[i];
let trimmed = word.trim_end();
let word_width = display_width(trimmed);
let trimmed_delta = word.len() - trimmed.len();
if i != 0 && self.hard_width < self.line_width + word_width {
if 0 < i {
let last = i - 1;
let trimmed = words[last].trim_end();
words[last] = trimmed;
}
self.line_width = 0;
words.insert(i, "\n");
i += 1;
if let Some(carryover) = self.carryover {
words.insert(i, carryover);
self.line_width += carryover.len();
i += 1;
}
}
self.line_width += word_width + trimmed_delta;
i += 1;
}
words
}
}