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111 lines
2.8 KiB
Rust
111 lines
2.8 KiB
Rust
//! The killring.
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//!
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//! Works like the killring in emacs and readline. The killring is cut and paste with a memory of
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//! previous cuts.
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use once_cell::sync::Lazy;
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use std::collections::VecDeque;
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use std::sync::Mutex;
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use crate::wchar::prelude::*;
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struct KillRing(VecDeque<WString>);
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static KILL_RING: Lazy<Mutex<KillRing>> = Lazy::new(|| Mutex::new(KillRing::new()));
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impl KillRing {
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/// Create a new killring.
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fn new() -> Self {
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Self(VecDeque::new())
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}
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/// Return whether this killring is empty.
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#[cfg(test)]
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fn is_empty(&self) -> bool {
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self.0.is_empty()
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}
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/// Add a string to the top of the killring.
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fn add(&mut self, new_entry: WString) {
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if !new_entry.is_empty() {
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self.0.push_front(new_entry);
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}
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}
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/// Replace the specified string in the killring.
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pub fn replace(&mut self, old_entry: &wstr, new_entry: WString) {
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if let Some(old_entry_idx) = self.0.iter().position(|entry| entry == old_entry) {
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self.0.remove(old_entry_idx);
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}
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if !new_entry.is_empty() {
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self.add(new_entry);
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}
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}
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/// Paste from the killring.
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pub fn yank(&mut self) -> WString {
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self.0.front().cloned().unwrap_or_default()
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}
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/// Rotate the killring.
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pub fn yank_rotate(&mut self) -> WString {
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self.0.rotate_left(1);
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self.yank()
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}
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/// Return a copy of the list of entries.
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pub fn entries(&self) -> Vec<WString> {
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self.0.iter().cloned().collect()
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}
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}
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/// Add a string to the top of the killring.
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pub fn kill_add(new_entry: WString) {
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KILL_RING.lock().unwrap().add(new_entry)
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}
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/// Replace the specified string in the killring.
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pub fn kill_replace(old_entry: &wstr, new_entry: WString) {
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KILL_RING.lock().unwrap().replace(old_entry, new_entry)
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}
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/// Rotate the killring.
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pub fn kill_yank_rotate() -> WString {
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KILL_RING.lock().unwrap().yank_rotate()
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}
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/// Paste from the killring.
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pub fn kill_yank() -> WString {
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KILL_RING.lock().unwrap().yank()
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}
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pub fn kill_entries() -> Vec<WString> {
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KILL_RING.lock().unwrap().entries()
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}
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#[test]
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fn test_killring() {
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let mut kr = KillRing::new();
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assert!(kr.is_empty());
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kr.add(WString::from_str("a"));
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kr.add(WString::from_str("b"));
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kr.add(WString::from_str("c"));
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assert!(kr.entries() == [L!("c"), L!("b"), L!("a")]);
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assert!(kr.yank_rotate() == "b");
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assert!(kr.entries() == [L!("b"), L!("a"), L!("c")]);
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assert!(kr.yank_rotate() == "a");
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assert!(kr.entries() == [L!("a"), L!("c"), L!("b")]);
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kr.add(WString::from_str("d"));
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assert!((kr.entries() == [L!("d"), L!("a"), L!("c"), L!("b")]));
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assert!(kr.yank_rotate() == "a");
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assert!((kr.entries() == [L!("a"), L!("c"), L!("b"), L!("d")]));
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}
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