allow gotail to accept multiple files

also rename cmd/tail to cmd/gotail

cmd/gotail/.gitignore

@@ -0,0 +1 @@
+gotail

cmd/gotail/Makefile

@@ -0,0 +1,4 @@
+default:	gotail
+
+gotail:	*.go ../../*.go
+	GOPATH=~/as/logyard go build

cmd/gotail/gotail.go

@@ -4,10 +4,9 @@ import (
 	"fmt"
 	"logyard/tail"
 	"flag"
+	"os"
 )
 
-var samplefile = "/tmp/test"
-
 func args2config() tail.Config {
 	config := tail.Config{Follow: true}
 	flag.IntVar(&config.Location, "n", 0, "tail from the last Nth location")
@@ -21,7 +20,25 @@ func args2config() tail.Config {
 }
 
 func main() {
-	t, err := tail.TailFile(samplefile, args2config())
+	config := args2config()
+	if flag.NFlag() < 1 {
+		fmt.Println("need one or more files as arguments")
+		os.Exit(1)
+	}
+
+	done := make(chan bool)
+	for _, filename := range flag.Args() {
+		go tailFile(filename, config, done)
+	}
+
+	for _, _ = range flag.Args() {
+		<-done
+	}
+}
+
+func tailFile(filename string, config tail.Config, done chan bool) {
+	defer func() { done <- true }()
+	t, err := tail.TailFile(filename, config)
 	if err != nil {
 		fmt.Println(err)
 		return

cmd/tail/.gitignore

@@ -1 +0,0 @@
-tail

cmd/tail/Makefile

@@ -1,4 +0,0 @@
-default:	tail
-
-tail:	*.go
-	GOPATH=~/as/logyard go build

tail.go

@@ -99,9 +99,8 @@ func (tail *Tail) reopen() error {
 		tail.file, err = os.Open(tail.Filename)
 		if err != nil {
 			if os.IsNotExist(err) {
-				log.Printf("Waiting for the file to appear...")
+				log.Printf("Waiting for %s to appear...", tail.Filename)
 				err := tail.watcher.BlockUntilExists()
-				log.Println(err)
 				if err != nil {
 					return fmt.Errorf("Failed to detect creation of %s: %s", tail.Filename, err)
 				}