gomp/render.go

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package main
import (
"github.com/aditya-K2/goMP/cache"
"github.com/spf13/viper"
"gitlab.com/diamondburned/ueberzug-go"
)
/*
Renderer is just a channel on which we will send the Path to the song whose
Image is to be Rendered. This channel is passed to the openImage which in turn is called
by the Start() function as a go routine.
*/
type Renderer struct {
c chan string
}
/*
Returns a new Renderer with a string channel
*/
func newRenderer() *Renderer {
c := make(chan string)
return &Renderer{
c: c,
}
}
/*
Send Image Path to Renderer
*/
func (self *Renderer) Send(path string) {
self.c <- path
}
/*
Go Routine that will Be Called and will listen on the channel c
for changes and on getting a string over the channel will open the Image and
keep listening again. This will keep the image blocked ( i.e no need to use time.Sleep() etc. )
and saves resources too.
*/
func openImage(path string, c chan string) {
fw, fh := getFontWidth()
var im *ueberzug.Image
if path != "stop" {
extractedImage := getImagePath(path)
img2, _ := getImg(extractedImage)
im, _ = ueberzug.NewImage(img2, int(float32(IMG_X)*fw)+viper.GetInt("ADDITIONAL_PADDING_X"), int(float32(IMG_Y)*fh)+viper.GetInt("ADDITIONAL_PADDING_Y"))
}
d := <-c
if im != nil {
im.Clear()
}
if d != "stop" {
openImage(d, c)
} else {
openImage("stop", c)
}
}
/*
Initialises the Renderer and calls the go routine openImage and passes the channel
as argument.
*/
func (self *Renderer) Start(path string) {
go openImage(path, self.c)
}
/*
This Function returns the path to the image that is to be rendered it checks first for the image in the cache
else it adds the image to the cache and then extracts it and renders it.
*/
func getImagePath(path string) string {
a, err := CONN.ListInfo(path)
var extractedImage string
if err == nil && len(a) != 0 {
if val, err := cache.GetFromCache(a[0]["artist"], a[0]["album"]); err == nil {
extractedImage = val
} else {
imagePath := cache.AddToCache(a[0]["artist"], a[0]["album"])
absPath := viper.GetString("MUSIC_DIRECTORY") + path
extractedImage = extractImageFromFile(absPath, imagePath)
if extractedImage == viper.GetString("DEFAULT_IMAGE_PATH") && viper.GetString("GET_COVER_ART_FROM_LAST_FM") == "TRUE" {
downloadedImage, err := getImageFromLastFM(a[0]["artist"], a[0]["album"], imagePath)
if err == nil {
NOTIFICATION_SERVER.Send("Image From LastFM")
extractedImage = downloadedImage
} else {
NOTIFICATION_SERVER.Send("Falling Back to Default Image.")
cache.PointToDefault(a[0]["artist"], a[0]["album"])
}
} else {
NOTIFICATION_SERVER.Send("Extracted Image Successfully")
}
}
}
return extractedImage
}