Add io.moveOffset()

Author: purplesyringa

js/core/stdio/default.js

@@ -49,6 +49,7 @@ defaultStdio.onsetbackgroundcolor = (bg) => {
 };
 
 defaultStdio.onmoveto = (x, y) => tty.moveTo(x, y);
+defaultStdio.onmoveoffset = (offset) => tty.moveOffset(offset);
 
 defaultStdio.onread = (cb) => tty.read(cb);
 

js/core/stdio/interface.js

@@ -23,6 +23,7 @@ class StdioInterface {
     this.onsetcolor = () => {};
     this.onsetbackgroundcolor = () => {};
     this.onmoveto = () => {};
+    this.onmoveoffset = () => {};
 
     this.write = this.write.bind(this);
     this.writeError = this.writeError.bind(this);
@@ -62,6 +63,9 @@ class StdioInterface {
   moveTo (x, y) {
     this.onmoveto(x, y);
   }
+  moveOffset (offset) {
+    this.onmoveoffset(offset);
+  }
 
   clear () {
     this.onclear();