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use std::path::{Path, PathBuf};
use crate::impl_selectable_content;
type DoublePB = (PathBuf, PathBuf);
/// A stack of visited paths.
/// We save the last folder and the selected file every time a `PatchContent` is updated.
/// We also ensure not to save the same pair multiple times.
#[derive(Default, Clone)]
pub struct History {
pub content: Vec<DoublePB>,
pub index: usize,
}
impl History {
/// Add a new path and a selected file in the stack, without duplicates, and select the last
/// one.
pub fn push(&mut self, path: &Path, file: &Path) {
let pair = (path.to_owned(), file.to_owned());
if !self.content.contains(&pair) {
self.content.push(pair);
self.index = self.len() - 1
}
}
/// Drop the last visited paths from the stack, after the selected one.
/// Used to go back a few steps in time.
pub fn drop_queue(&mut self) {
if self.is_empty() {
return;
}
let final_length = self.len() - self.index + 1;
self.content.truncate(final_length);
if self.is_empty() {
self.index = 0
} else {
self.index = self.len() - 1
}
}
/// True iff the last element of the stack has the same
/// path as the one given.
/// Doesn't check the associated file.
/// false if the stack is empty.
pub fn is_this_the_last(&self, path: &Path) -> bool {
if self.is_empty() {
return false;
}
self.content[self.len() - 1].0 == path
}
}
impl_selectable_content!(DoublePB, History);
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