add help flag to commands

Display command usage using the '--help' flag.

1 files changed, 15 insertions, 2 deletions

diff --git a/cmd/removepkg/main.go b/cmd/removepkg/main.go
index 5970112..dd21f54 100644
--- a/cmd/removepkg/main.go
+++ b/cmd/removepkg/main.go
@@ -1,24 +1,37 @@
 package main
 
+// TODO: print help when no arguments given
+
 import (
 	"flag"
 	"fmt"
 	"os"
 
 	"git.server.ky/slackcoder/pkgtools"
+	"github.com/pborman/getopt/v2"
 )
 
+func usage() {
+	getopt.PrintUsage(os.Stdout)
+}
+
 func ParseFlags() *pkgtools.RemovePkgFlags {
 	flags := pkgtools.DefaultRemovePkgFlags
 	flags.SetEnvValues()
 
-	flag.Parse()
-
+	getopt.Parse()
 	return &flags
 }
 
 func main() {
+	getopt.SetParameters("packagename ...")
+	help := getopt.BoolLong("help", 0, "display help")
+
 	flags := ParseFlags()
+	if len(getopt.Args()) == 0 || *help {
+		usage()
+		return
+	}
 
 	err := pkgtools.RemovePkg(flags, flag.Args()...)
 	if err != nil {