feat: output to clipboard or tmux buffer

src/output_destination.rs

@@ -0,0 +1,30 @@
+use std::fmt;
+
+/// Describes the type of buffer the selected should be copied to: either a
+/// tmux buffer or the system clipboard.
+#[derive(Clone)]
+pub enum OutputDestination {
+    /// The selection will be copied to the tmux buffer.
+    Tmux,
+    /// The selection will be copied to the system clipboard.
+    Clipboard,
+}
+
+impl OutputDestination {
+    /// Toggle between the variants of `OutputDestination`.
+    pub fn toggle(&mut self) {
+        match *self {
+            Self::Tmux => *self = Self::Clipboard,
+            Self::Clipboard => *self = Self::Tmux,
+        }
+    }
+}
+
+impl fmt::Display for OutputDestination {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::Tmux => write!(f, "tmux"),
+            Self::Clipboard => write!(f, "clipboard"),
+        }
+    }
+}