add basic logger

1 files changed, 25 insertions, 5 deletions

diff --git a/main.go b/main.go
index 691ff25..b813954 100644
--- a/main.go
+++ b/main.go
@@ -1,19 +1,39 @@
 package main
 
 import (
+	"flag"
 	"fmt"
 	"os"
+
+	"github.com/n-peugnet/dna-backup/logger"
 )
 
-func main() {
+const (
+	usage = "usage: dna-backup [<options>] [--] <source> <dest>\n\noptions:\n"
+)
+
+var (
+	logLevel int
+)
 
-	if len(os.Args) != 3 {
-		fmt.Println("usage: dna-backup <source> <dest>")
+func init() {
+	flag.IntVar(&logLevel, "v", 1, "log verbosity level (0-3)")
+}
+
+func main() {
+	flag.Usage = func() {
+		fmt.Fprintf(flag.CommandLine.Output(), usage)
+		flag.PrintDefaults()
+	}
+	flag.Parse()
+	logger.Init(logLevel)
+	if len(flag.Args()) != 2 {
+		flag.Usage()
 		os.Exit(1)
 	}
 
-	source := os.Args[1]
-	dest := os.Args[2]
+	source := os.Args[0]
+	dest := os.Args[1]
 	repo := NewRepo(dest)
 	repo.Commit(source)
 }