Added an API and test case for number of flags set

context.go

@@ -106,6 +106,11 @@ func (c *Context) GlobalGeneric(name string) interface{} {
 	return lookupGeneric(name, c.globalSet)
 }
 
+// Returns the number of flags set
+func (c *Context) NumFlags() int {
+	return c.flagSet.NFlag()
+}
+
 // Determines if the flag was actually set
 func (c *Context) IsSet(name string) bool {
 	if c.setFlags == nil {

context_test.go

@@ -97,3 +97,15 @@ func TestContext_GlobalIsSet(t *testing.T) {
 	expect(t, c.GlobalIsSet("myflagGlobalUnset"), false)
 	expect(t, c.GlobalIsSet("bogusGlobal"), false)
 }
+
+func TestContext_NumFlags(t *testing.T) {
+	set := flag.NewFlagSet("test", 0)
+	set.Bool("myflag", false, "doc")
+	set.String("otherflag", "hello world", "doc")
+	globalSet := flag.NewFlagSet("test", 0)
+	globalSet.Bool("myflagGlobal", true, "doc")
+	c := cli.NewContext(nil, set, globalSet)
+	set.Parse([]string{"--myflag", "--otherflag=foo"})
+	globalSet.Parse([]string{"--myflagGlobal"})
+	expect(t, c.NumFlags(), 2)
+}