Implement gt/gm/gb, remap goto tYpe to gy

book/src/keymap.md

@@ -118,8 +118,11 @@ Jumps to various locations.
 |-----|-----------|
 | g   | Go to the start of the file |
 | e   | Go to the end of the file |
+| t   | Go to the top of the screen |
+| m   | Go to the middle of the screen |
+| b   | Go to the bottom of the screen |
 | d   | Go to definition |
-| t   | Go to type definition |
+| y   | Go to type definition |
 | r   | Go to references |
 | i   | Go to implementation |
 

helix-term/src/commands.rs

@@ -1270,9 +1270,32 @@ pub fn goto_mode(cx: &mut Context) {
                 'g' => move_file_start(cx),
                 'e' => move_file_end(cx),
                 'd' => goto_definition(cx),
-                't' => goto_type_definition(cx),
+                'y' => goto_type_definition(cx),
                 'r' => goto_reference(cx),
                 'i' => goto_implementation(cx),
+
+                't' | 'm' | 'b' => {
+                    let (view, doc) = cx.current();
+
+                    let pos = doc.selection(view.id).cursor();
+                    let line = doc.text().char_to_line(pos);
+
+                    let scrolloff = PADDING.min(view.area.height as usize / 2); // TODO: user pref
+
+                    let last_line = view.last_line(doc);
+
+                    let line = match ch {
+                        't' => (view.first_line + scrolloff),
+                        'm' => (view.first_line + (view.area.height as usize / 2)),
+                        'b' => last_line.saturating_sub(scrolloff),
+                        _ => unreachable!(),
+                    }
+                    .min(last_line.saturating_sub(scrolloff));
+
+                    let pos = doc.text().line_to_char(line);
+
+                    doc.set_selection(view.id, Selection::point(pos));
+                }
                 _ => (),
             }
         }