Add new command to cycle through version control conflict markers

Issue: helix-editor#4647

helix-term/src/commands.rs

@@ -411,6 +411,8 @@ impl MappableCommand {
         goto_prev_test, "Goto previous test",
         goto_next_paragraph, "Goto next paragraph",
         goto_prev_paragraph, "Goto previous paragraph",
+        goto_next_conflict_marker, "Goto next conflict marker",
+        goto_prev_conflict_marker, "Goto prev conflict marker",
         dap_launch, "Launch debug target",
         dap_toggle_breakpoint, "Toggle breakpoint",
         dap_continue, "Continue program execution",
@@ -984,6 +986,23 @@ fn goto_next_paragraph(cx: &mut Context) {
     goto_para_impl(cx, movement::move_next_paragraph)
 }
 
+fn goto_conflict_marker(cx: &mut Context, movement: Movement, direction: Direction) {
+    let (_, doc) = current!(cx.editor);
+    let contents = doc.text().slice(..).to_string();
+    let re = Regex::new("<<<<<<<|=======|>>>>>>>").unwrap();
+    search_impl(
+        cx.editor, &contents, &re, movement, direction, 0, true, true,
+    );
+}
+
+fn goto_next_conflict_marker(cx: &mut Context) {
+    goto_conflict_marker(cx, Movement::Move, Direction::Forward)
+}
+
+fn goto_prev_conflict_marker(cx: &mut Context) {
+    goto_conflict_marker(cx, Movement::Move, Direction::Backward)
+}
+
 fn goto_file_start(cx: &mut Context) {
     if cx.count.is_some() {
         goto_line(cx);

helix-term/src/keymap/default.rs

@@ -106,6 +106,7 @@ pub fn default() -> HashMap<Mode, Keymap> {
             "o" => goto_prev_comment,
             "t" => goto_prev_test,
             "p" => goto_prev_paragraph,
+            "n" => goto_prev_conflict_marker,
             "space" => add_newline_above,
         },
         "]" => { "Right bracket"
@@ -117,6 +118,7 @@ pub fn default() -> HashMap<Mode, Keymap> {
             "o" => goto_next_comment,
             "t" => goto_next_test,
             "p" => goto_next_paragraph,
+            "n" => goto_next_conflict_marker,
             "space" => add_newline_below,
         },