From d5fc1dacfec12430f2d05d16ab6f78494aba52ba Mon Sep 17 00:00:00 2001
From: Martin Czygan <martin.czygan@gmail.com>
Date: Thu, 8 Jul 2021 18:43:47 +0200
Subject: reduce: prepare command line help

---
 skate/cmd/skate-reduce/main.go | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'skate/cmd')

diff --git a/skate/cmd/skate-reduce/main.go b/skate/cmd/skate-reduce/main.go
index 3130a22..8b6f086 100644
--- a/skate/cmd/skate-reduce/main.go
+++ b/skate/cmd/skate-reduce/main.go
@@ -60,6 +60,7 @@ package main
 import (
 	"bufio"
 	"flag"
+	"fmt"
 	"io/ioutil"
 	"log"
 	"os"
@@ -95,9 +96,20 @@ var (
 		"unknown": skate.MatchResult{Status: skate.StatusUnknown, Reason: skate.ReasonUnknown},
 		"isbn":    skate.MatchResult{Status: skate.StatusExact, Reason: skate.ReasonISBN},
 	}
+
+	help = `Reduce modes
+
+TODO: table of modes and inputs, or specific link to docs
+`
 )
 
 func main() {
+	flag.Usage = func() {
+		fmt.Fprintf(flag.CommandLine.Output(), "Usage of %s:\n", os.Args[0])
+		flag.PrintDefaults()
+		fmt.Println()
+		fmt.Println(help)
+	}
 	flag.Parse()
 	if *logFile != "" {
 		f, err := os.OpenFile(*logFile, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
-- 
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