Bug/fix issue 1703

help.go

@@ -42,6 +42,7 @@ var helpCommand = &Command{
 		// 3 $ app foo
 		// 4 $ app help foo
 		// 5 $ app foo help
+		// 6 $ app foo -h (with no other sub-commands nor flags defined)
 
 		// Case 4. when executing a help command set the context to parent
 		// to allow resolution of subsequent args. This will transform
@@ -77,6 +78,8 @@ var helpCommand = &Command{
 			HelpPrinter(cCtx.App.Writer, templ, cCtx.Command)
 			return nil
 		}
+
+		// Case 6, handling incorporated in the callee itself
 		return ShowSubcommandHelp(cCtx)
 	},
 }
@@ -292,8 +295,12 @@ func ShowSubcommandHelp(cCtx *Context) error {
 	if cCtx == nil {
 		return nil
 	}
-
-	HelpPrinter(cCtx.App.Writer, SubcommandHelpTemplate, cCtx.Command)
+	// use custom template when provided (fixes #1703)
+	templ := SubcommandHelpTemplate
+	if cCtx.Command != nil && cCtx.Command.CustomHelpTemplate != "" {
+		templ = cCtx.Command.CustomHelpTemplate
+	}
+	HelpPrinter(cCtx.App.Writer, templ, cCtx.Command)
 	return nil
 }
 

help_test.go

@@ -1126,6 +1126,29 @@ func TestHideHelpCommand_WithSubcommands(t *testing.T) {
 	}
 }
 
+func TestHideHelpCommand_RunAsSubcommand_True_CustomTemplate(t *testing.T) {
+	var buf bytes.Buffer
+
+	app := &App{
+		Writer: &buf,
+		Commands: []*Command{
+			{
+				Name:               "dummy",
+				CustomHelpTemplate: "TEMPLATE",
+				HideHelpCommand:    true,
+			},
+		},
+	}
+
+	err := app.RunAsSubcommand(newContextFromStringSlice([]string{"", "dummy", "-h"}))
+	if err != nil {
+		t.Errorf("Run returned unexpected error: %v", err)
+	}
+	if !strings.Contains(buf.String(), "TEMPLATE") {
+		t.Errorf("Custom Help template ignored")
+	}
+}
+
 func TestDefaultCompleteWithFlags(t *testing.T) {
 	origEnv := os.Environ()
 	origArgv := os.Args