JMS #28: -h flags for subcommands

command.go

@@ -10,9 +10,19 @@ type Command struct {
 }
 
 func (c Command) Run(ctx *Context) {
+	// append help to flags
+	c.Flags = append(
+		c.Flags,
+		helpFlag{"show help"},
+	)
+
 	set := flagSet(c.Name, c.Flags)
 	set.Parse(ctx.Args()[1:])
-	c.Action(NewContext(ctx.App, set, ctx.globalSet))
+
+	context := NewContext(ctx.App, set, ctx.globalSet)
+	checkCommandHelp(context, c.Name)
+
+	c.Action(context)
 }
 
 func (c Command) HasName(name string) bool {

help.go

@@ -101,3 +101,10 @@ func checkHelp(c *Context) {
 		os.Exit(0)
 	}
 }
+
+func checkCommandHelp(c *Context, name string) {
+	if c.Bool("h") || c.Bool("help") {
+		ShowCommandHelp(c, name)
+		os.Exit(0)
+	}
+}