Add mousetrap for Windows users

Fixes #80

cobra.go

@@ -31,6 +31,14 @@ var initializers []func()
 // Set this to true to enable it
 var EnablePrefixMatching bool = false
 
+// enables an information splash screen on Windows if the CLI is started from explorer.exe.
+var EnableWindowsMouseTrap bool = true
+
+var MousetrapHelpText string = `This is a command line tool
+
+You need to open cmd.exe and run it from there.
+`
+
 //OnInitialize takes a series of func() arguments and appends them to a slice of func().
 func OnInitialize(y ...func()) {
 	for _, x := range y {

command.go

@@ -18,11 +18,13 @@ package cobra
 import (
 	"bytes"
 	"fmt"
+	"github.com/inconshreveable/mousetrap"
+	flag "github.com/spf13/pflag"
 	"io"
 	"os"
+	"runtime"
 	"strings"
-
-	flag "github.com/spf13/pflag"
+	"time"
 )
 
 // Command is just that, a command for your application.
@@ -474,6 +476,14 @@ func (c *Command) Execute() (err error) {
 		return c.Root().Execute()
 	}
 
+	if EnableWindowsMouseTrap && runtime.GOOS == "windows" {
+		if mousetrap.StartedByExplorer() {
+			c.Print(MousetrapHelpText)
+			time.Sleep(5 * time.Second)
+			os.Exit(1)
+		}
+	}
+
 	// initialize help as the last point possible to allow for user
 	// overriding
 	c.initHelp()