Add ExpandSelection mouse binding action

Fixes #4132.

1 files changed, 31 insertions, 0 deletions

diff --git a/alacritty/src/config/bindings.rs b/alacritty/src/config/bindings.rs
index 57237ad3..a4271430 100644
--- a/alacritty/src/config/bindings.rs
+++ b/alacritty/src/config/bindings.rs
@@ -109,6 +109,10 @@ pub enum Action {
     #[config(skip)]
     Search(SearchAction),
 
+    /// Perform mouse binding exclusive action.
+    #[config(skip)]
+    Mouse(MouseAction),
+
     /// Paste contents of system clipboard.
     Paste,
 
@@ -227,12 +231,19 @@ impl From<SearchAction> for Action {
     }
 }
 
+impl From<MouseAction> for Action {
+    fn from(action: MouseAction) -> Self {
+        Self::Mouse(action)
+    }
+}
+
 /// Display trait used for error logging.
 impl Display for Action {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             Action::ViMotion(motion) => motion.fmt(f),
             Action::Vi(action) => action.fmt(f),
+            Action::Mouse(action) => action.fmt(f),
             _ => write!(f, "{:?}", self),
         }
     }
@@ -283,6 +294,13 @@ pub enum SearchAction {
     SearchHistoryNext,
 }
 
+/// Mouse binding specific actions.
+#[derive(ConfigDeserialize, Debug, Copy, Clone, PartialEq, Eq)]
+pub enum MouseAction {
+    /// Expand the selection to the current mouse cursor position.
+    ExpandSelection,
+}
+
 macro_rules! bindings {
     (
         KeyBinding;
@@ -343,6 +361,7 @@ macro_rules! bindings {
 pub fn default_mouse_bindings() -> Vec<MouseBinding> {
     bindings!(
         MouseBinding;
+        MouseButton::Right;                    MouseAction::ExpandSelection;
         MouseButton::Middle, ~BindingMode::VI; Action::PasteSelection;
     )
 }
@@ -1027,6 +1046,9 @@ impl<'a> Deserialize<'a> for RawBinding {
                                 SearchAction::deserialize(value.clone())
                             {
                                 Some(search_action.into())
+                            } else if let Ok(mouse_action) = MouseAction::deserialize(value.clone())
+                            {
+                                Some(mouse_action.into())
                             } else {
                                 match Action::deserialize(value.clone()).map_err(V::Error::custom) {
                                     Ok(action) => Some(action),
@@ -1102,6 +1124,15 @@ impl<'a> Deserialize<'a> for RawBinding {
                         }
                         action
                     },
+                    (Some(action @ Action::Mouse(_)), None, None) => {
+                        if mouse.is_none() {
+                            return Err(V::Error::custom(format!(
+                                "action `{}` is only available for mouse bindings",
+                                action,
+                            )));
+                        }
+                        action
+                    },
                     (Some(action), None, None) => action,
                     (None, Some(chars), None) => Action::Esc(chars),
                     (None, None, Some(cmd)) => Action::Command(cmd),