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use crate::cursor::*;
use std::io::Write;
pub struct LineBuf {
pre: Vec<u8>,
post: Vec<u8>,
dirty: bool,
}
#[allow(unused)]
impl LineBuf {
pub fn new() -> Self {
Self {
pre: Vec::new(),
post: Vec::new(),
dirty: false,
}
}
pub fn del_left(&mut self) -> Option<u8> {
self.dirty = true;
self.pre.pop()
}
pub fn del_right(&mut self) -> Option<u8> {
self.dirty = true;
self.post.pop()
}
pub fn len(&self) -> usize {
self.pre.len() + self.post.len()
}
pub fn left(&mut self) -> bool {
if let Some(byte) = self.del_left() {
self.post.push(byte);
true
} else {
false
}
}
pub fn right(&mut self) -> bool {
if let Some(byte) = self.del_right() {
self.pre.push(byte);
true
} else {
false
}
}
pub fn all_left(&mut self) -> usize {
let n = self.pre.len();
while self.left() {}
n
}
pub fn all_right(&mut self) -> usize {
let n = self.post.len();
while self.right() {}
n
}
pub fn add(&mut self, chr: u8) {
self.dirty = true;
self.pre.push(chr);
}
pub fn is_empty(&self) -> bool {
self.pre.is_empty() && self.post.is_empty()
}
pub fn is_dirty(&self) -> bool {
self.dirty
}
/// sets content all to the left
pub fn set_content(&mut self, buf: Vec<u8>) {
self.pre = buf;
self.post = Vec::new();
}
pub fn into_bytes(&self) -> Vec<u8> {
let mut buf = Vec::with_capacity(self.pre.len() + self.post.len());
buf.extend_from_slice(&self.pre);
for b in self.post.iter().rev() {
buf.push(*b);
}
buf
}
pub fn distance_from_right_end(&self) -> usize {
self.post.len()
}
/// returns the whole contents of the buffer, and empties it in the process
pub fn dump(&mut self) -> Vec<u8> {
while self.right() {}
let mut buf = Vec::new();
core::mem::swap(&mut self.pre, &mut buf);
self.dirty = false;
buf
}
pub fn clear(&mut self) {
self.pre.clear();
self.post.clear();
self.dirty = false;
}
/// TODO: kinda ugly that this is here
pub fn display_post(&self, post: &[u8]) {
for &x in self.post.iter().rev() {
std::io::stdout().write_all(&[x]).unwrap();
}
std::io::stdout().write_all(post).unwrap();
move_cursor(Direction::Left, self.post.len() + post.len());
std::io::stdout().flush().unwrap();
}
}
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