https://git.ruby-lang.org/ruby.git/commit/?id=53ed4fb376

From 53ed4fb37632789db69815bb9b9df0e3572779ef Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Mon, 9 Sep 2019 23:17:38 +0900
Subject: [ruby/io-console] Added IO#cursor for VT

https://github.com/ruby/io-console/commit/41a6a6cace

diff --git a/ext/io/console/console.c b/ext/io/console/console.c
index b50a73e..8c30684 100644
--- a/ext/io/console/console.c
+++ b/ext/io/console/console.c
@@ -836,7 +836,6 @@ console_key_pressed_p(VALUE io, VALUE k) https://github.com/ruby/ruby/blob/trunk/ext/io/console/console.c#L836
 }
 #else
 # define console_goto rb_f_notimplement
-# define console_cursor_pos rb_f_notimplement
 # define console_cursor_set rb_f_notimplement
 static VALUE
 read_vt_response(VALUE io, VALUE query)
@@ -875,6 +874,24 @@ console_vt_response(int argc, VALUE *argv, VALUE io) https://github.com/ruby/ruby/blob/trunk/ext/io/console/console.c#L874
     VALUE ret = ttymode_with_io(io, read_vt_response, query, set_rawmode, optp);
     return ret;
 }
+
+static VALUE
+console_cursor_pos(VALUE io)
+{
+    VALUE query = rb_str_new_cstr("\e[6n");
+    VALUE resp = console_vt_response(1, &query, io);
+    VALUE row, column, term;
+    if (!RB_TYPE_P(resp, T_ARRAY) || RARRAY_LEN(resp) != 3) return Qnil;
+    term = RARRAY_AREF(resp, 2);
+    if (!RB_TYPE_P(term, T_STRING) || RSTRING_LEN(term) != 1) return Qnil;
+    if (RSTRING_PTR(term)[0] != 'R') return Qnil;
+    row = RARRAY_AREF(resp, 0);
+    column = RARRAY_AREF(resp, 1);
+    rb_ary_resize(resp, 2);
+    RARRAY_ASET(resp, 0, column);
+    RARRAY_ASET(resp, 1, row);
+    return resp;
+}
 # define console_key_pressed_p rb_f_notimplement
 #endif
 
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