Restructure go project (#2356)

* Move main to cmd
* Move api to internal
* Move logger and manager to internal
* Move shell hiding code to separate package
* Decouple job from desktop and utils
* Decouple session from config
* Move static into internal
* Decouple config from dlna
* Move desktop to internal
* Move dlna to internal
* Decouple remaining packages from config
* Move config into internal
* Move jsonschema and paths to models
* Make ffmpeg functions private
* Move file utility methods into fsutil package
* Move symwalk into fsutil
* Move single-use util functions into client package
* Move slice functions to separate packages
* Add env var to suppress windowsgui arg
* Move hash functions into separate package
* Move identify to internal
* Move autotag to internal
* Touch UI when generating backend

internal/manager/task_generate_sprite.go

@@ -0,0 +1,65 @@
+package manager
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/stashapp/stash/pkg/fsutil"
+	"github.com/stashapp/stash/pkg/logger"
+	"github.com/stashapp/stash/pkg/models"
+)
+
+type GenerateSpriteTask struct {
+	Scene               models.Scene
+	Overwrite           bool
+	fileNamingAlgorithm models.HashAlgorithm
+}
+
+func (t *GenerateSpriteTask) GetDescription() string {
+	return fmt.Sprintf("Generating sprites for %s", t.Scene.Path)
+}
+
+func (t *GenerateSpriteTask) Start(ctx context.Context) {
+	if !t.Overwrite && !t.required() {
+		return
+	}
+
+	ffprobe := instance.FFProbe
+	videoFile, err := ffprobe.NewVideoFile(t.Scene.Path, false)
+	if err != nil {
+		logger.Errorf("error reading video file: %s", err.Error())
+		return
+	}
+
+	sceneHash := t.Scene.GetHash(t.fileNamingAlgorithm)
+	imagePath := instance.Paths.Scene.GetSpriteImageFilePath(sceneHash)
+	vttPath := instance.Paths.Scene.GetSpriteVttFilePath(sceneHash)
+	generator, err := NewSpriteGenerator(*videoFile, sceneHash, imagePath, vttPath, 9, 9)
+
+	if err != nil {
+		logger.Errorf("error creating sprite generator: %s", err.Error())
+		return
+	}
+	generator.Overwrite = t.Overwrite
+
+	if err := generator.Generate(); err != nil {
+		logger.Errorf("error generating sprite: %s", err.Error())
+		return
+	}
+}
+
+// required returns true if the sprite needs to be generated
+func (t GenerateSpriteTask) required() bool {
+	sceneHash := t.Scene.GetHash(t.fileNamingAlgorithm)
+	return !t.doesSpriteExist(sceneHash)
+}
+
+func (t *GenerateSpriteTask) doesSpriteExist(sceneChecksum string) bool {
+	if sceneChecksum == "" {
+		return false
+	}
+
+	imageExists, _ := fsutil.FileExists(instance.Paths.Scene.GetSpriteImageFilePath(sceneChecksum))
+	vttExists, _ := fsutil.FileExists(instance.Paths.Scene.GetSpriteVttFilePath(sceneChecksum))
+	return imageExists && vttExists
+}