feat: backward/forward

app/src/app.rs

@@ -119,9 +119,9 @@ impl App {
 		let manager = &mut self.cx.manager;
 		let tasks = &mut self.cx.tasks;
 		match event {
-			Event::Cd(url) => {
+			Event::Cd(url, backstack_push) => {
 				futures::executor::block_on(async {
-					manager.active_mut().cd(expand_url(url)).await;
+					manager.active_mut().cd(expand_url(url), backstack_push).await;
 				});
 			}
 			Event::Refresh => {

app/src/executor.rs

@@ -78,7 +78,7 @@ impl Executor {
 				if exec.named.contains_key("interactive") {
 					cx.manager.active_mut().cd_interactive(url)
 				} else {
-					emit!(Cd(url));
+					emit!(Cd(url, true));
 					false
 				}
 			}

core/src/event.rs

@@ -21,7 +21,7 @@ pub enum Event {
 	Call(Vec<Exec>, KeymapLayer),
 
 	// Manager
-	Cd(Url),
+	Cd(Url, bool),
 	Refresh,
 	Files(FilesOp),
 	Pages(usize),
@@ -71,8 +71,8 @@ macro_rules! emit {
 		$crate::Event::Call($exec, $layer).emit();
 	};
 
-	(Cd($url:expr)) => {
-		$crate::Event::Cd($url).emit();
+	(Cd($url:expr, $backstack_push:expr)) => {
+		$crate::Event::Cd($url, $backstack_push).emit();
 	};
 	(Files($op:expr)) => {
 		$crate::Event::Files($op).emit();

core/src/external/clipboard.rs

@@ -86,5 +86,5 @@ pub async fn clipboard_set(s: impl AsRef<std::ffi::OsStr>) -> Result<()> {
 	let result =
 		tokio::task::spawn_blocking(move || set_clipboard(formats::Unicode, s.to_string_lossy()));
 
-	Ok(result.await?.map_err(|_| anyhow!("failed to set clipboard"))?)
+	result.await?.map_err(|_| anyhow!("failed to set clipboard"))
 }

core/src/manager/backstack.rs

@@ -0,0 +1,69 @@
+pub struct BackStack<T> {
+	current: usize,
+	stack:   Vec<T>,
+}
+
+impl<T> BackStack<T> {
+	pub fn new(item: T) -> Self { Self { current: 0, stack: vec![item] } }
+
+	pub fn shift_backward(&mut self) -> Option<&T> {
+		if self.current > 0 {
+			self.current -= 1;
+			Some(&self.stack[self.current])
+		} else {
+			None
+		}
+	}
+
+	pub fn shift_forward(&mut self) -> Option<&T> {
+		if self.current + 1 == self.stack.len() {
+			None
+		} else {
+			self.current += 1;
+			Some(&self.stack[self.current])
+		}
+	}
+
+	pub fn push(&mut self, item: T) {
+		self.current += 1;
+		if self.current == self.stack.len() {
+			self.stack.push(item);
+		} else {
+			self.stack[self.current] = item;
+			self.stack.truncate(self.current + 1);
+		}
+	}
+}
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	fn get_current<T>(backstack: &BackStack<T>) -> &T { &backstack.stack[backstack.current] }
+
+	#[test]
+	fn test_backstack() {
+		let mut backstack = BackStack::<i32>::new(1);
+		assert_eq!(get_current(&backstack), &1);
+
+		backstack.push(2);
+		backstack.push(3);
+		assert_eq!(get_current(&backstack), &3);
+
+		assert_eq!(backstack.shift_backward(), Some(&2));
+		assert_eq!(backstack.shift_backward(), Some(&1));
+		assert_eq!(backstack.shift_backward(), None);
+		assert_eq!(backstack.shift_backward(), None);
+		assert_eq!(get_current(&backstack), &1);
+		assert_eq!(backstack.shift_forward(), Some(&2));
+		assert_eq!(backstack.shift_forward(), Some(&3));
+		assert_eq!(backstack.shift_forward(), None);
+
+		backstack.shift_backward();
+		backstack.push(4);
+
+		assert_eq!(get_current(&backstack), &4);
+		assert_eq!(backstack.shift_forward(), None);
+		assert_eq!(backstack.shift_backward(), Some(&2));
+	}
+}

core/src/manager/mod.rs

@@ -1,3 +1,4 @@
+mod backstack;
 mod finder;
 mod folder;
 mod manager;

core/src/manager/tab.rs

@@ -6,7 +6,7 @@ use shared::{Debounce, Defer, InputError, Url};
 use tokio::{pin, task::JoinHandle};
 use tokio_stream::{wrappers::UnboundedReceiverStream, StreamExt};
 
-use super::{Finder, Folder, Mode, Preview, PreviewLock};
+use super::{backstack::BackStack, Finder, Folder, Mode, Preview, PreviewLock};
 use crate::{emit, external::{self, FzfOpt, ZoxideOpt}, files::{File, FilesOp, FilesSorter}, input::InputOpt, Event, Step, BLOCKER};
 
 pub struct Tab {
@@ -14,6 +14,7 @@ pub struct Tab {
 	pub(super) current: Folder,
 	pub(super) parent:  Option<Folder>,
 
+	pub(super) backstack: BackStack<Url>,
 	pub(super) history:   BTreeMap<Url, Folder>,
 	pub(super) preview:   Preview,
 
@@ -29,9 +30,10 @@ impl From<Url> for Tab {
 
 		Self {
 			mode: Default::default(),
-			current: Folder::from(url),
+			current: Folder::from(url.clone()),
 			parent,
 
+			backstack: BackStack::new(url),
 			history: Default::default(),
 			preview: Default::default(),
 
@@ -87,7 +89,7 @@ impl Tab {
 		true
 	}
 
-	pub async fn cd(&mut self, mut target: Url) -> bool {
+	pub async fn cd(&mut self, mut target: Url, backstack_push: bool) -> bool {
 		let Ok(file) = File::from(target.clone()).await else {
 			return false;
 		};
@@ -109,6 +111,10 @@ impl Tab {
 			self.history.insert(rep.cwd.clone(), rep);
 		}
 
+		if backstack_push {
+			self.backstack.push(target.clone());
+		}
+
 		let rep = self.history_new(&target);
 		let rep = mem::replace(&mut self.current, rep);
 		if rep.cwd.is_regular() {
@@ -132,7 +138,7 @@ impl Tab {
 				emit!(Input(InputOpt::top("Change directory:").with_value(target.to_string_lossy())));
 
 			if let Some(Ok(s)) = result.recv().await {
-				emit!(Cd(Url::from(s)));
+				emit!(Cd(Url::from(s), true));
 			}
 		});
 		false
@@ -157,6 +163,8 @@ impl Tab {
 		}
 		self.parent = Some(self.history_new(&hovered.parent().unwrap()));
 
+		self.backstack.push(self.current.cwd.clone());
+
 		emit!(Refresh);
 		true
 	}
@@ -187,15 +195,25 @@ impl Tab {
 			self.history.insert(rep.cwd.clone(), rep);
 		}
 
+		self.backstack.push(self.current.cwd.clone());
+
 		emit!(Refresh);
 		true
 	}
 
-	// TODO
-	pub fn back(&mut self) -> bool { false }
+	pub fn back(&mut self) -> bool {
+		if let Some(url) = self.backstack.shift_backward() {
+			emit!(Cd(url.clone(), false));
+		}
+		false
+	}
 
-	// TODO
-	pub fn forward(&mut self) -> bool { false }
+	pub fn forward(&mut self) -> bool {
+		if let Some(url) = self.backstack.shift_forward() {
+			emit!(Cd(url.clone(), false));
+		}
+		false
+	}
 
 	pub fn select(&mut self, state: Option<bool>) -> bool {
 		if let Some(ref hovered) = self.current.hovered {
@@ -309,7 +327,7 @@ impl Tab {
 			let mut first = true;
 			while let Some(chunk) = rx.next().await {
 				if first {
-					emit!(Cd(cwd.clone()));
+					emit!(Cd(cwd.clone(), true));
 					first = false;
 				}
 				emit!(Files(FilesOp::Part(cwd.clone(), ticket, chunk)));
@@ -345,7 +363,7 @@ impl Tab {
 				if global { external::fzf(FzfOpt { cwd }) } else { external::zoxide(ZoxideOpt { cwd }) }?;
 
 			if let Ok(target) = rx.await? {
-				emit!(Cd(target));
+				emit!(Cd(target, true));
 			}
 			Ok::<(), Error>(())
 		});