Add move-column-to-index action

niri-config/src/lib.rs

@@ -1509,6 +1509,7 @@ pub enum Action {
     MoveColumnToLast,
     MoveColumnLeftOrToMonitorLeft,
     MoveColumnRightOrToMonitorRight,
+    MoveColumnToIndex(#[knuffel(argument)] usize),
     MoveWindowDown,
     MoveWindowUp,
     MoveWindowDownOrToWorkspaceDown,
@@ -1704,6 +1705,7 @@ impl From<niri_ipc::Action> for Action {
             niri_ipc::Action::MoveColumnRight {} => Self::MoveColumnRight,
             niri_ipc::Action::MoveColumnToFirst {} => Self::MoveColumnToFirst,
             niri_ipc::Action::MoveColumnToLast {} => Self::MoveColumnToLast,
+            niri_ipc::Action::MoveColumnToIndex { index } => Self::MoveColumnToIndex(index),
             niri_ipc::Action::MoveColumnLeftOrToMonitorLeft {} => {
                 Self::MoveColumnLeftOrToMonitorLeft
             }

niri-ipc/src/lib.rs

@@ -301,6 +301,14 @@ pub enum Action {
     MoveColumnLeftOrToMonitorLeft {},
     /// Move the focused column to the right or to the monitor to the right.
     MoveColumnRightOrToMonitorRight {},
+    /// Move the focused column to a specific index on its workspace.
+    MoveColumnToIndex {
+        /// New index for the column.
+        ///
+        /// The index starts from 1 for the first column.
+        #[cfg_attr(feature = "clap", arg())]
+        index: usize,
+    },
     /// Move the focused window down in a column.
     MoveWindowDown {},
     /// Move the focused window up in a column.

src/input/mod.rs

@@ -1167,6 +1167,12 @@ impl State {
                     self.niri.queue_redraw_all();
                 }
             }
+            Action::MoveColumnToIndex(idx) => {
+                self.niri.layout.move_column_to_index(idx);
+                self.maybe_warp_cursor_to_focus();
+                // FIXME: granular
+                self.niri.queue_redraw_all();
+            }
             Action::FocusWorkspaceDown => {
                 self.niri.layout.switch_workspace_down();
                 self.maybe_warp_cursor_to_focus();

src/layout/mod.rs

@@ -1830,6 +1830,13 @@ impl<W: LayoutElement> Layout<W> {
         true
     }
 
+    pub fn move_column_to_index(&mut self, index: usize) {
+        let Some(workspace) = self.active_workspace_mut() else {
+            return;
+        };
+        workspace.move_column_to_index(index);
+    }
+
     pub fn move_down(&mut self) {
         let Some(workspace) = self.active_workspace_mut() else {
             return;

src/layout/scrolling.rs

@@ -1583,6 +1583,14 @@ impl<W: LayoutElement> ScrollingSpace<W> {
         self.columns[self.active_column_idx].focus_bottom()
     }
 
+    pub fn move_column_to_index(&mut self, index: usize) {
+        if self.columns.is_empty() {
+            return;
+        }
+
+        self.move_column_to(index.saturating_sub(1).min(self.columns.len() - 1));
+    }
+
     fn move_column_to(&mut self, new_idx: usize) {
         if self.active_column_idx == new_idx {
             return;

src/layout/tests.rs

@@ -399,6 +399,7 @@ enum Op {
     MoveColumnToLast,
     MoveColumnLeftOrToMonitorLeft(#[proptest(strategy = "1..=2u8")] u8),
     MoveColumnRightOrToMonitorRight(#[proptest(strategy = "1..=2u8")] u8),
+    MoveColumnToIndex(#[proptest(strategy = "1..=5usize")] usize),
     MoveWindowDown,
     MoveWindowUp,
     MoveWindowDownOrToWorkspaceDown,
@@ -975,6 +976,7 @@ impl Op {
 
                 layout.move_column_right_or_to_output(&output);
             }
+            Op::MoveColumnToIndex(index) => layout.move_column_to_index(index),
             Op::MoveWindowDown => layout.move_down(),
             Op::MoveWindowUp => layout.move_up(),
             Op::MoveWindowDownOrToWorkspaceDown => layout.move_down_or_to_workspace_down(),

src/layout/workspace.rs

@@ -972,6 +972,13 @@ impl<W: LayoutElement> Workspace<W> {
         self.scrolling.move_column_to_last();
     }
 
+    pub fn move_column_to_index(&mut self, index: usize) {
+        if self.floating_is_active.get() {
+            return;
+        }
+        self.scrolling.move_column_to_index(index);
+    }
+
     pub fn move_down(&mut self) -> bool {
         if self.floating_is_active.get() {
             self.floating.move_down();