initial commit - working code

new file:   .gitignore
	new file:   .idea/.gitignore
	new file:   .idea/Steamworks-Collection-Downloader.iml
	new file:   .idea/modules.xml
	new file:   .idea/vcs.xml
	new file:   downloader/downloadable.go
	new file:   downloader/downloader.go
	new file:   go.mod
	new file:   go.sum
	new file:   main.go
	new file:   manifest/entry.go
	new file:   manifest/manifest.go
	new file:   webapi/publishedFileDetailsResponse.go

main.go

@@ -0,0 +1,122 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+
+	"github.com/Neo-Desktop/Steamworks-Collection-Downloader/downloader"
+	"github.com/Neo-Desktop/Steamworks-Collection-Downloader/manifest"
+)
+
+var (
+	APIKEY       string
+	SEEDS        []string
+	PATH         string
+	MANIFESTJSON string
+)
+
+const (
+	REPOURL = "https://github.com/Neo-Desktop/Steamworks-Collection-Downloader"
+)
+
+func init() {
+	flag.Usage = usage
+
+	flagAPIKEY := flag.String("apikey", "", "Required: Steamworks Web API key")
+	flagHELP := flag.Bool("help", false, "Displays this help message")
+	flagPREFIX := flag.String("prefix", "."+string(os.PathSeparator)+"workshop", "path to the <gamedir>/addons/workshop folder")
+	flagMANIFEST := flag.String("manifest", "workshopmanifest.json", "filename to store the current state of downloaded files (will be stored in prefix)")
+
+	envAPIKEY := os.Getenv("WSDL_APIKEY")
+	envPREFIX := os.Getenv("WSDL_PREFIX")
+	envSEEDS := os.Getenv("WSDL_SEEDS")
+	envMANIFEST := os.Getenv("WSDL_MANIFEST")
+
+	flag.Parse()
+
+	if flagAPIKEY != nil && *flagAPIKEY != "" {
+		APIKEY = *flagAPIKEY
+	} else if envAPIKEY != "" {
+		APIKEY = envAPIKEY
+	} else {
+		fmt.Fprintf(os.Stderr, "Please specify an APIKEY\n\n")
+		usage()
+		os.Exit(1)
+	}
+
+	if flagPREFIX != nil && *flagPREFIX != "" {
+		PATH = *flagPREFIX
+	} else if envPREFIX != "" {
+		PATH = envPREFIX
+	} else {
+		fmt.Fprintf(os.Stderr, "Please specify a prefix\n\n")
+		usage()
+		os.Exit(1)
+	}
+
+	if flagMANIFEST != nil && *flagMANIFEST != "" {
+		MANIFESTJSON = *flagMANIFEST
+	} else if envMANIFEST != "" {
+		MANIFESTJSON = envMANIFEST
+	} else {
+		fmt.Fprintf(os.Stderr, "Please specify a filename for the manifest\n\n")
+		usage()
+		os.Exit(1)
+	}
+
+	if len(flag.Args()) != 0 {
+		SEEDS = flag.Args()
+	} else if envSEEDS != "" {
+		SEEDS = strings.Split(envSEEDS, " ")
+	} else {
+		fmt.Fprintf(os.Stderr, "Please specify one or more items to download (as command line arguments)\n\n")
+		usage()
+		os.Exit(1)
+	}
+
+	if PATH[len(PATH)-1] != os.PathSeparator {
+		PATH = PATH + string(os.PathSeparator)
+	}
+
+	if *flagHELP {
+		usage()
+		os.Exit(1)
+	}
+}
+
+func usage() {
+	fmt.Fprintf(os.Stderr, "Usage: %s [options] (-apikey <key>) <id> [...]\n", os.Args[0])
+
+	flag.PrintDefaults()
+
+	fmt.Fprintf(os.Stderr, "   <id> string\n        Required: one or more Steamworks collection(s) or file ID(s) to download\n")
+	fmt.Fprintf(os.Stderr, "\nPlease visit %s for source code and more information\n\n", REPOURL)
+}
+
+func main() {
+	d := new(downloader.Downloader)
+	m := new(manifest.Manifest)
+
+	err := d.Start(APIKEY, SEEDS, PATH)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%s\n", err)
+		os.Exit(2)
+	}
+
+	d.DisplayFetched()
+
+	err = m.Open(MANIFESTJSON, PATH)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%s\n", err)
+		os.Exit(2)
+	}
+
+	d.UpdateFiles(m)
+
+	m.Close()
+
+	log.Println("Completed!")
+}