From 8fa09c244ad7fa7b47bd43d322831709676e143b Mon Sep 17 00:00:00 2001
From: Jack Grigg <jack@z.cash>
Date: Wed, 18 Apr 2018 02:57:58 +0100
Subject: [PATCH] Metrics UI: Enable virtual terminal sequence processing on
 Windows

https://docs.microsoft.com/en-us/windows/console/console-virtual-terminal-sequences
---
 src/metrics.cpp | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/src/metrics.cpp b/src/metrics.cpp
index 6f238e947..6dede3929 100644
--- a/src/metrics.cpp
+++ b/src/metrics.cpp
@@ -414,6 +414,30 @@ int printInitMessage()
     return 2;
 }
 
+#ifdef WIN32
+#define ENABLE_VIRTUAL_TERMINAL_PROCESSING 0x0004
+
+bool enableVTMode()
+{
+    // Set output mode to handle virtual terminal sequences
+    HANDLE hOut = GetStdHandle(STD_OUTPUT_HANDLE);
+    if (hOut == INVALID_HANDLE_VALUE) {
+        return false;
+    }
+
+    DWORD dwMode = 0;
+    if (!GetConsoleMode(hOut, &dwMode)) {
+        return false;
+    }
+
+    dwMode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
+    if (!SetConsoleMode(hOut, dwMode)) {
+        return false;
+    }
+    return true;
+}
+#endif
+
 void ThreadShowMetricsScreen()
 {
     // Make this thread recognisable as the metrics screen thread
@@ -425,6 +449,10 @@ void ThreadShowMetricsScreen()
     int64_t nRefresh = GetArg("-metricsrefreshtime", isTTY ? 1 : 600);
 
     if (isScreen) {
+#ifdef WIN32
+        enableVTMode();
+#endif
+
         // Clear screen
         std::cout << "\e[2J";