make help and version parsing use actual specified values

fixes #254

help.go

@@ -186,21 +186,29 @@ func printHelp(out io.Writer, templ string, data interface{}) {
 }
 
 func checkVersion(c *Context) bool {
-	if c.GlobalBool("version") || c.GlobalBool("v") || c.Bool("version") || c.Bool("v") {
+	found := false
+	if VersionFlag.Name != "" {
+		eachName(VersionFlag.Name, func(name string) {
+			if c.GlobalBool(name) || c.Bool(name) {
 				ShowVersion(c)
-		return true
+				found = true
 			}
-
-	return false
+		})
+	}
+	return found
 }
 
 func checkHelp(c *Context) bool {
-	if c.GlobalBool("h") || c.GlobalBool("help") || c.Bool("h") || c.Bool("help") {
+	found := false
+	if HelpFlag.Name != "" {
+		eachName(HelpFlag.Name, func(name string) {
+			if c.GlobalBool(name) || c.Bool(name) {
 				ShowAppHelp(c)
-		return true
+				found = true
 			}
-
-	return false
+		})
+	}
+	return found
 }
 
 func checkCommandHelp(c *Context, name string) bool {

help_test.go

@@ -34,3 +34,61 @@ func Test_ShowAppHelp_NoVersion(t *testing.T) {
 		t.Errorf("expected\n%snot to include %s", output.String(), "VERSION:")
 	}
 }
+
+func Test_Help_Custom_Flags(t *testing.T) {
+	oldFlag := HelpFlag
+	defer func() {
+		HelpFlag = oldFlag
+	}()
+
+	HelpFlag = BoolFlag{
+		Name:  "help, x",
+		Usage: "show help",
+	}
+
+	app := App{
+		Flags: []Flag{
+			BoolFlag{Name: "foo, h"},
+		},
+		Action: func(ctx *Context) {
+			if ctx.Bool("h") != true {
+				t.Errorf("custom help flag not set")
+			}
+		},
+	}
+	output := new(bytes.Buffer)
+	app.Writer = output
+	app.Run([]string{"test", "-h"})
+	if output.Len() > 0 {
+		t.Errorf("unexpected output: %s", output.String())
+	}
+}
+
+func Test_Version_Custom_Flags(t *testing.T) {
+	oldFlag := VersionFlag
+	defer func() {
+		VersionFlag = oldFlag
+	}()
+
+	VersionFlag = BoolFlag{
+		Name:  "version, V",
+		Usage: "show version",
+	}
+
+	app := App{
+		Flags: []Flag{
+			BoolFlag{Name: "foo, v"},
+		},
+		Action: func(ctx *Context) {
+			if ctx.Bool("v") != true {
+				t.Errorf("custom version flag not set")
+			}
+		},
+	}
+	output := new(bytes.Buffer)
+	app.Writer = output
+	app.Run([]string{"test", "-v"})
+	if output.Len() > 0 {
+		t.Errorf("unexpected output: %s", output.String())
+	}
+}