move manifest related code to its own file

main.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"encoding/json"
 	"flag"
 	"fmt"
 	"io"
@@ -17,24 +16,6 @@ type CliFlags struct {
 	verbose          bool
 }
 
-type UgoiraManifestFrame struct {
-	File  string `json:"file"`
-	Delay int    `json:"delay"`
-}
-
-type UgoiraManifestBodyDesc struct {
-	Src         string                `json:"src"`
-	OriginalSrc string                `json:"originalSrc"`
-	MimeType    string                `json:"mime_type"`
-	Frames      []UgoiraManifestFrame `json:"frames"`
-}
-
-type UgoiraManifest struct {
-	Error   bool                   `json:"error"`
-	Message string                 `json:"message"`
-	Body    UgoiraManifestBodyDesc `json:"body"`
-}
-
 type PostId uint64
 
 const (
@@ -67,17 +48,6 @@ func doPixivRequest(client *http.Client, url, referer, userAgent string) io.Read
 	return response.Body
 }
 
-func decodeUgoiraManifest(jsonData []byte) UgoiraManifest {
-	var manifest UgoiraManifest
-	if err := json.Unmarshal(jsonData, &manifest); err != nil {
-		die("Could not parse manifest JSON: %s", err)
-	}
-	if manifest.Error {
-		die("Manifest returned error: %s", manifest.Message)
-	}
-	return manifest
-}
-
 func getUgoira(postId PostId, flags CliFlags) {
 	client := &http.Client{}
 	artworkUrl := fmt.Sprintf(ArtworkUrlTemplate, postId)

manifest.go

@@ -0,0 +1,34 @@
+package main;
+
+import (
+	"encoding/json"
+)
+
+type UgoiraManifestFrame struct {
+	File  string `json:"file"`
+	Delay int    `json:"delay"`
+}
+
+type UgoiraManifestBodyDesc struct {
+	Src         string                `json:"src"`
+	OriginalSrc string                `json:"originalSrc"`
+	MimeType    string                `json:"mime_type"`
+	Frames      []UgoiraManifestFrame `json:"frames"`
+}
+
+type UgoiraManifest struct {
+	Error   bool                   `json:"error"`
+	Message string                 `json:"message"`
+	Body    UgoiraManifestBodyDesc `json:"body"`
+}
+
+func decodeUgoiraManifest(jsonData []byte) UgoiraManifest {
+	var manifest UgoiraManifest
+	if err := json.Unmarshal(jsonData, &manifest); err != nil {
+		die("Could not parse manifest JSON: %s", err)
+	}
+	if manifest.Error {
+		die("Manifest returned error: %s", manifest.Message)
+	}
+	return manifest
+}