Switch from kingpin to cobra

This enables easier use of sub-commands for flexibility

main.go

@@ -1,69 +1,19 @@
 package main
 
 import (
-	"bytes"
-	"fmt"
-	"log"
-	"strings"
-
-	"gopkg.in/alecthomas/kingpin.v2"
+	"github.com/jimeh/rbheapleak/cmd"
 )
 
 var (
-	name    = "rbheapleak"
 	version = "dev"
 	commit  = "unknown"
 	date    = "unknown"
-
-	formatFlag = kingpin.Flag("format", "Output format (\"hex\" or \"full\")").
-			Short('f').Default("hex").String()
-	silentFlag = kingpin.Flag("silent", "Silence all info output").
-			Short('s').Bool()
-
-	file1Path = kingpin.Arg("dump-1", "Path to first heap dump file.").
-			Required().String()
-	file2Path = kingpin.Arg("dump-2", "Path to second heap dump file.").
-			Required().String()
-	file3Path = kingpin.Arg("dump-3", "Path to Third heap dump file.").
-			Required().String()
 )
 
-func versionString() string {
-	var buffer bytes.Buffer
-	var meta []string
-
-	buffer.WriteString(fmt.Sprintf("%s %s", name, version))
-
-	if commit != "unknown" {
-		meta = append(meta, commit)
-	}
-
-	if date != "unknown" {
-		meta = append(meta, date)
-	}
-
-	if len(meta) > 0 {
-		buffer.WriteString(fmt.Sprintf(" (%s)", strings.Join(meta, ", ")))
-	}
-
-	return buffer.String()
-}
-
 func main() {
-	kingpin.Version(versionString())
-	kingpin.Parse()
-
-	finder := NewLeakFinder(*file1Path, *file2Path, *file3Path)
-	finder.Verbose = !*silentFlag
-
-	err := finder.Process()
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	if *formatFlag == "hex" {
-		finder.PrintLeakedAddresses()
-	} else if *formatFlag == "full" {
-		finder.PrintLeakedObjects()
-	}
+	cmd.Execute(&cmd.BuildInfo{
+		Version: version,
+		Commit:  commit,
+		Date:    date,
+	})
 }