From 72fe8cb4794069b8662395dc7e5b8c42b207b956 Mon Sep 17 00:00:00 2001
From: whyrusleeping <why@ipfs.io>
Date: Thu, 23 Jul 2020 11:46:22 -0700
Subject: [PATCH] add the actual code

---
 cli/helper.go | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 cli/helper.go

diff --git a/cli/helper.go b/cli/helper.go
new file mode 100644
index 000000000..5626488e0
--- /dev/null
+++ b/cli/helper.go
@@ -0,0 +1,45 @@
+package cli
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/urfave/cli/v2"
+)
+
+type PrintHelpErr struct {
+	Err error
+	Ctx *cli.Context
+}
+
+func (e *PrintHelpErr) Error() string {
+	return e.Err.Error()
+}
+
+func (e *PrintHelpErr) Unwrap() error {
+	return e.Err
+}
+
+func (e *PrintHelpErr) Is(o error) bool {
+	_, ok := o.(*PrintHelpErr)
+	return ok
+}
+
+func ShowHelp(cctx *cli.Context, err error) error {
+	return &PrintHelpErr{Err: err, Ctx: cctx}
+}
+
+func RunApp(app *cli.App) {
+	if err := app.Run(os.Args); err != nil {
+		if os.Getenv("LOTUS_DEV") != "" {
+			log.Warnf("%+v", err)
+		} else {
+			fmt.Printf("ERROR: %s\n\n", err)
+		}
+		phe, ok := err.(*PrintHelpErr)
+		if ok {
+			cli.ShowCommandHelp(phe.Ctx, phe.Ctx.Command.Name)
+		}
+		os.Exit(1)
+	}
+}