Added several flags to configure the program

Readme.md

@@ -13,5 +13,9 @@ A Makefile is in progress but currently does not add the version.
 
 # Run
 
-The default port is 8080. Env VIDDOWNLOC is where videos are saved to.    
+The default port is 8080.  
+
+For help:   
+
+    viddown -h
 

src/Dockerfile

@@ -6,6 +6,4 @@ RUN apt-get clean
 
 COPY viddown /usr/bin/viddown
 
-ENV VIDDOWNLOC /srv/
-
-CMD ["/usr/bin/viddown"]
+CMD ["/usr/bin/viddown", "-o", "/srv"]

src/viddown.go

@@ -21,6 +21,7 @@ package main
 
 import (
 	"encoding/json"
+	"flag"
 	"io"
 	"io/ioutil"
 	"log"
@@ -80,6 +81,10 @@ var currentWork map[int]string
 var config struct {
 	// Where files should be saved
 	saveLocation string
+	// Where to find youtube-dl program, must be full name
+	youtubedll string
+	// The port the server listens on
+	port int
 }
 
 // Global channel to send operation requests to
@@ -134,7 +139,7 @@ func operationHandler() {
 			os.MkdirAll(dir, 0755)
 
 			// Build the download command
-			cmd := exec.Command("youtube-dl", o.URL)
+			cmd := exec.Command(config.youtubedll, o.URL)
 			cmd.Dir = dir + "/"
 			currentWork[i] = o.URL // Adds the URL to list of current work
 			output, err := cmd.CombinedOutput()
@@ -171,15 +176,18 @@ func operationHandler() {
 	log.Fatal("Exited operationsHandler")
 }
 
-func main() {
-	// Set the location to save videos
-	if os.Getenv("VIDDOWNLOC") == "" {
-		config.saveLocation = "./"
-	} else {
-		config.saveLocation = os.Getenv("VIDDOWNLOC")
-	}
+// handleConfigs configures the program at start, handling any flags or env variables
+func handleConfigs() {
+	flag.StringVar(&config.saveLocation, "o", "./", "The output location for videos")
+	flag.StringVar(&config.youtubedll, "y", "youtube-dl", "The full location of youtube-dl")
+	flag.IntVar(&config.port, "p", 8080, "The port the server listens on")
+	flag.Parse()
 	log.Println("Downloading files to: " + config.saveLocation)
 
+}
+
+func main() {
+	handleConfigs()
 	// initialize currentWork with a blank map
 	currentWork = make(map[int]string)
 
@@ -192,6 +200,6 @@ func main() {
 	// Start the http server
 	handler := http.HandlerFunc(handleRequest)
 	http.Handle("/", handler)
-	log.Printf("Starting server on 8080")
-	http.ListenAndServe(":8080", nil)
+	log.Printf("Starting server on " + strconv.Itoa(config.port))
+	http.ListenAndServe(":"+strconv.Itoa(config.port), nil)
 }