Ignore tmp/backup files while using watcher

This fixes #212 and Adds the logic to skip tmp and backup files
generated by Emacs, Vim or SublimeText. More RegExps can be added
to 'ignoredFilesRegExps' slice in watch.go file.

watch.go

@@ -17,14 +17,14 @@ package main
 import (
 	"bytes"
 	"fmt"
+	"github.com/howeyc/fsnotify"
 	"os"
 	"os/exec"
+	"regexp"
 	"runtime"
 	"strings"
 	"sync"
 	"time"
-
-	"github.com/howeyc/fsnotify"
 )
 
 var (
@@ -47,8 +47,8 @@ func NewWatcher(paths []string, files []string, isgenerate bool) {
 			case e := <-watcher.Event:
 				isbuild := true
 
-				// Skip TMP files for Sublime Text.
-				if checkTMPFile(e.Name) {
+				// Skip ignored files
+				if shouldIgnoreFile(e.Name) {
 					continue
 				}
 				if !checkIfWatchExt(e.Name) {
@@ -230,15 +230,30 @@ func Start(appname string) {
 	started <- true
 }
 
-// checkTMPFile returns true if the event was for TMP files.
-func checkTMPFile(name string) bool {
-	if strings.HasSuffix(strings.ToLower(name), ".tmp") {
-		return true
+// Should ignore filenames generated by
+// Emacs, Vim or SublimeText
+func shouldIgnoreFile(filename string) bool {
+	for _, regex := range ignoredFilesRegExps {
+		r, err := regexp.Compile(regex)
+		if err != nil {
+			panic("Could not compile the regex: " + regex)
+		}
+		if r.MatchString(filename) {
+			return true
+		} else {
+			continue
+		}
 	}
 	return false
 }
 
 var watchExts = []string{".go"}
+var ignoredFilesRegExps = []string{
+	`.#(\w+).go`,
+	`.(\w+).go.swp`,
+	`(\w+).go~`,
+	`(\w+).tmp`,
+}
 
 // checkIfWatchExt returns true if the name HasSuffix <watch_ext>.
 func checkIfWatchExt(name string) bool {