Colored output failed on Windows machines - fixed now.

GitLab Runner terminal output failed to output color codes on Windows machines. Instead, code gibberish was output.

This merge request fixes color output on Windows machines.

Gopkg.lock

@@ -1076,6 +1076,7 @@
     "gitlab.com/gitlab-org/gitlab-terminal",
     "golang.org/x/crypto/ssh",
     "golang.org/x/net/context",
+    "golang.org/x/sys/windows",
     "gopkg.in/yaml.v2",
     "k8s.io/api/core/v1",
     "k8s.io/apimachinery/pkg/api/resource",

Gopkg.toml

@@ -158,6 +158,10 @@ ignored = ["test", "appengine"]
   name = "github.com/markelog/trie"
   branch = "master"
 
+[[constraint]]
+  name = "golang.org/x/sys"
+  branch = "master"
+
 ##
 ## Refrain innovations ;)
 ##

helpers/cli/init_cli.go

+// +build !windows
+
+package cli_helpers
+
+func InitCli() {}

helpers/cli/init_cli_windows.go

+package cli_helpers
+
+import (
+	"github.com/sirupsen/logrus"
+	"golang.org/x/sys/windows"
+)
+
+// InitCli initializes the Windows console window by activating virtual terminal features.
+// Calling this function enables colored terminal output.
+func InitCli() {
+	setConsoleMode(windows.Stdout, windows.ENABLE_VIRTUAL_TERMINAL_PROCESSING) // enable VT processing on standard output stream
+	setConsoleMode(windows.Stderr, windows.ENABLE_VIRTUAL_TERMINAL_PROCESSING) // enable VT processing on standard error stream
+}
+
+// setConsoleMode sets the given flags on the given
+// console standard stream.
+func setConsoleMode(handle windows.Handle, flags uint32) {
+	var mode uint32
+
+	// add console mode flag
+	if err := windows.GetConsoleMode(handle, &mode); err == nil {
+		err := windows.SetConsoleMode(handle, mode|flags)
+		if err != nil {
+			logrus.WithError(err).Info("Failed to set console mode for cli")
+		}
+	}
+}

main.go

@@ -52,6 +52,7 @@ func main() {
 		logrus.Fatalln("Command", command, "not found.")
 	}
 
+	cli_helpers.InitCli()
 	cli_helpers.LogRuntimePlatform(app)
 	cli_helpers.SetupCPUProfile(app)
 	cli_helpers.FixHOME(app)