Adding custom usage template

Author: kenshaw

run.go

@@ -75,6 +75,7 @@ func Run(ctx context.Context, cliargs []string) error {
 	c.SetVersionTemplate("{{ .Name }} {{ .Version }}\n")
 	c.SetArgs(cliargs[1:])
 	c.SilenceErrors = true
+	c.SetUsageTemplate(text.UsageTemplate)
 
 	flags := c.Flags()
 	flags.SortFlags = false

text/text.go

@@ -93,6 +93,14 @@ var (
 	NotificationReceived = `Asynchronous notification %q %sreceived from server process with PID %d.`
 	NotificationPayload  = `with payload %q `
 	UnknownShortAlias    = `(unk)`
+	UsageTemplate        = `Usage: {{.UseLine}}
+
+Args:
+  DSN   database url
+
+Flags:
+{{.LocalFlags.FlagUsages | trimTrailingWhitespaces}}
+`
 )
 
 func init() {