Added whoami util

src/cmd/goblin/main.go

@@ -29,6 +29,7 @@ import(
 	"github.com/surdeus/goblin/src/tool/mk"
 	"github.com/surdeus/goblin/src/tool/awk"
 	"github.com/surdeus/goblin/src/tool/paths"
+	"github.com/surdeus/goblin/src/tool/whoami"
 )
 
 func main() {
@@ -63,6 +64,10 @@ func main() {
 			paths.Run,
 			"convert UNIX slash separated paths into the OS compatible ones",
 		},
+		"whoami": mtool.Tool{
+			whoami.Run,
+			"print current user name",
+		},
 	}
 
 	mtool.Main("goblin", tools)

src/tool/whoami/main.go

@@ -0,0 +1,32 @@
+package whoami
+
+import(
+	"os"
+	"os/user"
+	"flag"
+	"fmt"
+	"log"
+)
+
+func Run(args []string) {
+	arg0 := args[0]
+	args = args[1:]
+	flagSet := flag.NewFlagSet(arg0, flag.ExitOnError)
+	flagSet.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Usage of %s: %s\n", arg0, arg0)
+		flagSet.PrintDefaults()
+	}
+	flagSet.Parse(args)
+
+	if len(flagSet.Args())>0 {
+		flagSet.Usage()
+		os.Exit(1)
+	}
+	
+	u, err := user.Current()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Print(u.Username)
+}