Add song.go. Compiles, not tested yet though

Makefile

@@ -1,6 +1,6 @@
 all: mumbledj
 
-mumbledj: main.go commands.go parseconfig.go strings.go queue.go
+mumbledj: main.go commands.go parseconfig.go strings.go queue.go song.go
 	go build .
 		
 clean:

song.go

@@ -0,0 +1,69 @@
+/*
+ * MumbleDJ
+ * By Matthieu Grieger
+ * song.go
+ * Copyright (c) 2014 Matthieu Grieger (MIT License)
+ */
+
+package main
+
+import (
+	//"github.com/layeh/gumble/gumble_ffmpeg"
+	"os/exec"
+	"fmt"
+)
+
+type Song struct {
+	submitter string
+	title string
+	youtubeId string
+	duration string
+	thumbnailUrl string
+	skippers []string
+}
+
+func NewSong(user, id string) *Song {
+	song := &Song{
+		submitter: user,
+		youtubeId: id,
+	}
+	return song
+}
+
+func (s *Song) Download() bool {
+	err := exec.Command(fmt.Sprintf("youtube-dl --output ~/.mumbledj/songs/%(id)s.%(ext)s --quiet --format bestaudio --audio-format vorbis --prefer-ffmpeg https://youtube.com/watch?v=%s", s.youtubeId))
+	if err == nil {
+		return true
+	} else {
+		return false
+	}
+}
+
+func (s *Song) Play() bool {
+	return false
+}
+
+func (s *Song) Delete() bool {
+	return false
+}
+
+func (s *Song) AddSkip(username string) bool {
+	for _,user := range s.skippers {
+		if username == user {
+			return false
+		}
+	}
+	s.skippers = append(s.skippers, username)
+	return true
+}
+
+func (s *Song) RemoveSkip(username string) bool {
+	for i,user := range s.skippers {
+		if username == user {
+			s.skippers = append(s.skippers[:i], s.skippers[i+1:]...)
+			return true
+		}
+	}
+	return false
+}
+