Allow a count with CurrentLine

Add _ and g_ too while we're here.

assets/keymaps/vim.json

@@ -32,6 +32,8 @@
       "right": "vim::Right",
       "$": "vim::EndOfLine",
       "^": "vim::FirstNonWhitespace",
+      "_": "vim::StartOfLineDownward",
+      "g _": "vim::EndOfLineDownward",
       "shift-g": "vim::EndOfDocument",
       "w": "vim::NextWordStart",
       "{": "vim::StartOfParagraph",

crates/vim/src/motion.rs

@@ -40,6 +40,8 @@ pub enum Motion {
     FindForward { before: bool, char: char },
     FindBackward { after: bool, char: char },
     NextLineStart,
+    StartOfLineDownward,
+    EndOfLineDownward,
 }
 
 #[derive(Clone, Deserialize, PartialEq)]
@@ -117,6 +119,8 @@ actions!(
         EndOfDocument,
         Matching,
         NextLineStart,
+        StartOfLineDownward,
+        EndOfLineDownward,
     ]
 );
 impl_actions!(
@@ -207,6 +211,12 @@ pub fn init(cx: &mut AppContext) {
          cx: _| { motion(Motion::PreviousWordStart { ignore_punctuation }, cx) },
     );
     cx.add_action(|_: &mut Workspace, &NextLineStart, cx: _| motion(Motion::NextLineStart, cx));
+    cx.add_action(|_: &mut Workspace, &StartOfLineDownward, cx: _| {
+        motion(Motion::StartOfLineDownward, cx)
+    });
+    cx.add_action(|_: &mut Workspace, &EndOfLineDownward, cx: _| {
+        motion(Motion::EndOfLineDownward, cx)
+    });
     cx.add_action(|_: &mut Workspace, action: &RepeatFind, cx: _| {
         repeat_motion(action.backwards, cx)
     })
@@ -272,6 +282,7 @@ impl Motion {
             | EndOfDocument
             | CurrentLine
             | NextLineStart
+            | StartOfLineDownward
             | StartOfParagraph
             | EndOfParagraph => true,
             EndOfLine { .. }
@@ -282,6 +293,7 @@ impl Motion {
             | Backspace
             | Right
             | StartOfLine { .. }
+            | EndOfLineDownward
             | NextWordStart { .. }
             | PreviousWordStart { .. }
             | FirstNonWhitespace { .. }
@@ -305,6 +317,8 @@ impl Motion {
             | StartOfLine { .. }
             | StartOfParagraph
             | EndOfParagraph
+            | StartOfLineDownward
+            | EndOfLineDownward
             | NextWordStart { .. }
             | PreviousWordStart { .. }
             | FirstNonWhitespace { .. }
@@ -322,6 +336,7 @@ impl Motion {
             | EndOfDocument
             | CurrentLine
             | EndOfLine { .. }
+            | EndOfLineDownward
             | NextWordEnd { .. }
             | Matching
             | FindForward { .. }
@@ -330,6 +345,7 @@ impl Motion {
             | Backspace
             | Right
             | StartOfLine { .. }
+            | StartOfLineDownward
             | StartOfParagraph
             | EndOfParagraph
             | NextWordStart { .. }
@@ -396,7 +412,7 @@ impl Motion {
                 map.clip_at_line_end(movement::end_of_paragraph(map, point, times)),
                 SelectionGoal::None,
             ),
-            CurrentLine => (end_of_line(map, false, point), SelectionGoal::None),
+            CurrentLine => (next_line_end(map, point, 1), SelectionGoal::None),
             StartOfDocument => (start_of_document(map, point, times), SelectionGoal::None),
             EndOfDocument => (
                 end_of_document(map, point, maybe_times),
@@ -412,6 +428,8 @@ impl Motion {
                 SelectionGoal::None,
             ),
             NextLineStart => (next_line_start(map, point, times), SelectionGoal::None),
+            StartOfLineDownward => (next_line_start(map, point, times - 1), SelectionGoal::None),
+            EndOfLineDownward => (next_line_end(map, point, times), SelectionGoal::None),
         };
 
         (new_point != point || infallible).then_some((new_point, goal))
@@ -849,6 +867,13 @@ fn next_line_start(map: &DisplaySnapshot, point: DisplayPoint, times: usize) ->
     first_non_whitespace(map, false, correct_line)
 }
 
+fn next_line_end(map: &DisplaySnapshot, mut point: DisplayPoint, times: usize) -> DisplayPoint {
+    if times > 1 {
+        point = down(map, point, SelectionGoal::None, times - 1).0;
+    }
+    end_of_line(map, false, point)
+}
+
 #[cfg(test)]
 
 mod test {