Simple yank/paste registers.

4 files changed, 25 insertions, 2 deletions

diff --git a/helix-core/src/lib.rs b/helix-core/src/lib.rs
index 9bc5d003..4a7a2dd4 100644
--- a/helix-core/src/lib.rs
+++ b/helix-core/src/lib.rs
@@ -3,6 +3,7 @@ pub mod graphemes;
 mod history;
 pub mod macros;
 mod position;
+pub mod register;
 pub mod selection;
 pub mod state;
 pub mod syntax;
diff --git a/helix-core/src/register.rs b/helix-core/src/register.rs
new file mode 100644
index 00000000..0be0ce89
--- /dev/null
+++ b/helix-core/src/register.rs
@@ -0,0 +1,21 @@
+use crate::Tendril;
+use once_cell::sync::Lazy;
+use std::{collections::HashMap, sync::RwLock};
+
+// TODO: could be an instance on Editor
+static REGISTRY: Lazy<RwLock<HashMap<char, Vec<String>>>> =
+    Lazy::new(|| RwLock::new(HashMap::new()));
+
+pub fn get(register: char) -> Option<Vec<String>> {
+    let registry = REGISTRY.read().unwrap();
+
+    // TODO: no cloning
+    registry.get(&register).cloned()
+}
+
+// restoring: bool
+pub fn set(register: char, values: Vec<String>) {
+    let mut registry = REGISTRY.write().unwrap();
+
+    registry.insert(register, values);
+}
diff --git a/helix-core/src/selection.rs b/helix-core/src/selection.rs
index 2251c77f..bc677330 100644
--- a/helix-core/src/selection.rs
+++ b/helix-core/src/selection.rs
@@ -110,7 +110,8 @@ impl Range {
 
     #[inline]
     pub fn fragment<'a>(&'a self, text: &'a RopeSlice) -> Cow<'a, str> {
-        Cow::from(text.slice(self.from()..self.to()))
+        // end inclusive
+        Cow::from(text.slice(self.from()..self.to() + 1))
     }
 }
 
diff --git a/helix-core/src/transaction.rs b/helix-core/src/transaction.rs
index 13c0c50f..33612ecf 100644
--- a/helix-core/src/transaction.rs
+++ b/helix-core/src/transaction.rs
@@ -445,7 +445,7 @@ impl Transaction {
     /// Generate a transaction with a change per selection range.
     pub fn change_by_selection<F>(state: &State, f: F) -> Self
     where
-        F: Fn(&Range) -> Change,
+        F: FnMut(&Range) -> Change,
     {
         Self::change(state, state.selection.ranges().iter().map(f))
     }