feat: backward/forward (#230)

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 +1,82 @@
+pub struct Backstack<T: Eq> {
+	cursor: usize,
+	stack:  Vec<T>,
+}
+
+impl<T: Eq> Backstack<T> {
+	pub fn new(item: T) -> Self { Self { cursor: 0, stack: vec![item] } }
+
+	pub fn push(&mut self, item: T) {
+		if self.stack[self.cursor] == item {
+			return;
+		}
+
+		self.cursor += 1;
+		if self.cursor == self.stack.len() {
+			self.stack.push(item);
+		} else {
+			self.stack[self.cursor] = item;
+			self.stack.truncate(self.cursor + 1);
+		}
+
+		// Only keep 30 items before the cursor, the cleanup threshold is 60
+		if self.stack.len() > 60 {
+			let start = self.cursor.saturating_sub(30);
+			self.stack.drain(..start);
+			self.cursor -= start;
+		}
+	}
+
+	#[cfg(test)]
+	#[inline]
+	pub fn current(&self) -> &T { &self.stack[self.cursor] }
+
+	pub fn shift_backward(&mut self) -> Option<&T> {
+		if self.cursor > 0 {
+			self.cursor -= 1;
+			Some(&self.stack[self.cursor])
+		} else {
+			None
+		}
+	}
+
+	pub fn shift_forward(&mut self) -> Option<&T> {
+		if self.cursor + 1 == self.stack.len() {
+			None
+		} else {
+			self.cursor += 1;
+			Some(&self.stack[self.cursor])
+		}
+	}
+}
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	#[test]
+	fn test_backstack() {
+		let mut backstack = Backstack::<u32>::new(1);
+		assert_eq!(backstack.current(), &1);
+
+		backstack.push(2);
+		backstack.push(3);
+		assert_eq!(backstack.current(), &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!(backstack.current(), &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!(backstack.current(), &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;
@@ -7,6 +8,7 @@ mod tab;
 mod tabs;
 mod watcher;
 
+pub use backstack::*;
 pub use finder::*;
 pub use folder::*;
 pub use 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, 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(),
 
@@ -87,6 +89,7 @@ impl Tab {
 		true
 	}
 
+	// TODO: change to sync, and remove `Event::Cd`
 	pub async fn cd(&mut self, mut target: Url) -> bool {
 		let Ok(file) = File::from(target.clone()).await else {
 			return false;
@@ -98,6 +101,7 @@ impl Tab {
 			target = target.parent_url().unwrap();
 		}
 
+		// Already in target
 		if self.current.cwd == target {
 			if hovered.map(|h| self.current.hover_force(h)) == Some(true) {
 				emit!(Hover);
@@ -105,23 +109,31 @@ impl Tab {
 			return false;
 		}
 
+		// Take parent to history
 		if let Some(rep) = self.parent.take() {
 			self.history.insert(rep.cwd.clone(), rep);
 		}
 
+		// Current
 		let rep = self.history_new(&target);
 		let rep = mem::replace(&mut self.current, rep);
 		if rep.cwd.is_regular() {
 			self.history.insert(rep.cwd.clone(), rep);
 		}
 
+		// Parent
 		if let Some(parent) = target.parent_url() {
 			self.parent = Some(self.history_new(&parent));
 		}
 
+		// Hover the file
 		if let Some(h) = hovered {
 			self.current.hover_force(h);
 		}
+
+		// Backstack
+		self.backstack.push(target.clone());
+
 		emit!(Refresh);
 		true
 	}
@@ -146,17 +158,22 @@ impl Tab {
 			return false;
 		}
 
+		// Current
 		let rep = self.history_new(hovered.url());
 		let rep = mem::replace(&mut self.current, rep);
 		if rep.cwd.is_regular() {
 			self.history.insert(rep.cwd.clone(), rep);
 		}
 
+		// Parent
 		if let Some(rep) = self.parent.take() {
 			self.history.insert(rep.cwd.clone(), rep);
 		}
 		self.parent = Some(self.history_new(&hovered.parent().unwrap()));
 
+		// Backstack
+		self.backstack.push(hovered.url_owned());
+
 		emit!(Refresh);
 		true
 	}
@@ -174,6 +191,7 @@ impl Tab {
 			return false;
 		};
 
+		// Parent
 		if let Some(rep) = self.parent.take() {
 			self.history.insert(rep.cwd.clone(), rep);
 		}
@@ -181,21 +199,33 @@ impl Tab {
 			self.parent = Some(self.history_new(&parent));
 		}
 
+		// Current
 		let rep = self.history_new(&current);
 		let rep = mem::replace(&mut self.current, rep);
 		if rep.cwd.is_regular() {
 			self.history.insert(rep.cwd.clone(), rep);
 		}
 
+		// Backstack
+		self.backstack.push(current);
+
 		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().cloned() {
+			futures::executor::block_on(self.cd(url));
+		}
+		false
+	}
 
-	// TODO
-	pub fn forward(&mut self) -> bool { false }
+	pub fn forward(&mut self) -> bool {
+		if let Some(url) = self.backstack.shift_forward().cloned() {
+			futures::executor::block_on(self.cd(url));
+		}
+		false
+	}
 
 	pub fn select(&mut self, state: Option<bool>) -> bool {
 		if let Some(ref hovered) = self.current.hovered {

cspell.json

@@ -1 +1 @@
-{"language":"en","words":["Punct","KEYMAP","splitn","crossterm","YAZI","unar","peekable","ratatui","syntect","pbpaste","pbcopy","ffmpegthumbnailer","oneshot","Posix","Lsar","XADDOS","zoxide","cands","Deque","precache","imageops","IFBLK","IFCHR","IFDIR","IFIFO","IFLNK","IFMT","IFSOCK","IRGRP","IROTH","IRUSR","ISGID","ISUID","ISVTX","IWGRP","IWOTH","IWUSR","IXGRP","IXOTH","IXUSR","libc","winsize","TIOCGWINSZ","xpixel","ypixel","ioerr","appender","Catppuccin","macchiato","gitmodules","Dotfiles","bashprofile","vimrc","flac","webp","exiftool","mediainfo","ripgrep","nvim","indexmap","indexmap","unwatch","canonicalize","serde","fsevent","Ueberzug","iterm","wezterm","sixel","chafa","ueberzugpp","️ Überzug","️ Überzug","Konsole","Alacritty","Überzug","pkgs","paru","unarchiver","pdftoppm","poppler","prebuild","singlefile","jpegopt","EXIF","rustfmt","mktemp","nanos","xclip","xsel","natord","Mintty","nixos","nixpkgs","SIGTSTP","SIGCONT","SIGCONT"],"version":"0.2","flagWords":[]}
+{"version":"0.2","words":["Punct","KEYMAP","splitn","crossterm","YAZI","unar","peekable","ratatui","syntect","pbpaste","pbcopy","ffmpegthumbnailer","oneshot","Posix","Lsar","XADDOS","zoxide","cands","Deque","precache","imageops","IFBLK","IFCHR","IFDIR","IFIFO","IFLNK","IFMT","IFSOCK","IRGRP","IROTH","IRUSR","ISGID","ISUID","ISVTX","IWGRP","IWOTH","IWUSR","IXGRP","IXOTH","IXUSR","libc","winsize","TIOCGWINSZ","xpixel","ypixel","ioerr","appender","Catppuccin","macchiato","gitmodules","Dotfiles","bashprofile","vimrc","flac","webp","exiftool","mediainfo","ripgrep","nvim","indexmap","indexmap","unwatch","canonicalize","serde","fsevent","Ueberzug","iterm","wezterm","sixel","chafa","ueberzugpp","️ Überzug","️ Überzug","Konsole","Alacritty","Überzug","pkgs","paru","unarchiver","pdftoppm","poppler","prebuild","singlefile","jpegopt","EXIF","rustfmt","mktemp","nanos","xclip","xsel","natord","Mintty","nixos","nixpkgs","SIGTSTP","SIGCONT","SIGCONT","backstack"],"flagWords":[],"language":"en"}