From 5e2efb55c601bfff8b005f43ec65ac1bc79e0efc Mon Sep 17 00:00:00 2001
From: Marko Milivojevic <markom@gmail.com>
Date: Fri, 26 Nov 2021 21:20:51 -0800
Subject: [PATCH] Improve help text.

---
 .goreleaser.yaml |  1 +
 main/help.go     | 17 +++++++++++++++++
 main/main.go     |  7 +++++--
 3 files changed, 23 insertions(+), 2 deletions(-)
 create mode 100644 main/help.go

diff --git a/.goreleaser.yaml b/.goreleaser.yaml
index 74b51c8..7730bf5 100644
--- a/.goreleaser.yaml
+++ b/.goreleaser.yaml
@@ -10,6 +10,7 @@ builds:
       - -w 
       - -X main.version={{.Version}}
       - -X main.gitCommit={{.ShortCommit}}
+      - -X main.binaryName={{.ProjectName}}
     targets:
       - linux_amd64
       - linux_arm64
diff --git a/main/help.go b/main/help.go
new file mode 100644
index 0000000..2feadf8
--- /dev/null
+++ b/main/help.go
@@ -0,0 +1,17 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+)
+
+func programVersion() {
+	fmt.Fprintf(flag.CommandLine.Output(), "Version: %s\n Commit: %s\n", version, gitCommit)
+}
+
+func programUsage() {
+	fmt.Fprintf(flag.CommandLine.Output(), "Usage: %s [flags] hostname.or.ip.address\n\nFlags:\n", binaryName)
+	flag.PrintDefaults()
+	fmt.Fprintln(flag.CommandLine.Output())
+	programVersion()
+}
diff --git a/main/main.go b/main/main.go
index 0c4f452..b6a14d7 100644
--- a/main/main.go
+++ b/main/main.go
@@ -12,8 +12,10 @@ import (
 )
 
 var (
-	cfg                mffp.Config
-	version, gitCommit string
+	cfg        mffp.Config
+	version    = "development"
+	gitCommit  = ""
+	binaryName = "mffprober"
 )
 
 func printVersion(v, g string) {
@@ -25,6 +27,7 @@ func init() {
 		v, e bool
 		h    string
 	)
+	flag.Usage = func() { programUsage() }
 
 	flag.StringVar(&h, "host", "", "DEPRECATED: Specify host name/address after the flags.")
 	flag.DurationVar(&cfg.Interval, "interval", 10*time.Second, "Polling interval in seconds")