From 09f939d3a0140478f2e547f45b4becd05247d360 Mon Sep 17 00:00:00 2001
From: "U.Nakamura" <usa@ruby-lang.org>
Date: Mon, 21 Dec 2020 17:29:09 +0900
Subject: [PATCH] Enable escape sequence on Windows10 console

	* win32/win32.c (init_stdhandle): enable escape sequence on
	  Windows10 console to show `ruby --help` colors correctly.
---
 win32/win32.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/win32/win32.c b/win32/win32.c
index 5934d7de28..5985875fe2 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -2687,6 +2687,17 @@ init_stdhandle(void)
     }
     if (nullfd >= 0 && !keep) close(nullfd);
     setvbuf(stderr, NULL, _IONBF, 0);
+
+    {
+        HANDLE h = GetStdHandle(STD_OUTPUT_HANDLE);
+        DWORD m;
+        if (GetConsoleMode(h, &m)) {
+#ifndef ENABLE_VIRTUAL_TERMINAL_PROCESSING
+#define ENABLE_VIRTUAL_TERMINAL_PROCESSING 0x200
+#endif
+            SetConsoleMode(h, m | ENABLE_VIRTUAL_TERMINAL_PROCESSING);
+        }
+    }
 }
 
 #undef getsockopt