add runtime configuration, see --help or commit

- where the requests file is
- the listen address and port

main.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"embed"
 	"encoding/csv"
+	"flag"
 	"fmt"
 	"html/template"
 	"log"
@@ -18,8 +19,14 @@ type EmojiDetails struct {
 	Url   string
 }
 
+type Config struct {
+	RequestsFile string
+	Listen       string
+}
+
 //go:embed templates
 var indexHTML embed.FS
+var config Config
 
 func handleForm(w http.ResponseWriter, r *http.Request) {
 	tmpl := template.Must(template.ParseFS(indexHTML, "templates/index.html"))
@@ -43,7 +50,7 @@ func handleForm(w http.ResponseWriter, r *http.Request) {
 
 func handleRequested(w http.ResponseWriter, r *http.Request) {
 	tmpl := template.Must(template.ParseFS(indexHTML, "templates/requested.html"))
-	file, _ := os.ReadFile("requests.txt")
+	file, _ := os.ReadFile(config.RequestsFile)
 	requests, _ := csv.NewReader(bytes.NewReader(file)).ReadAll()
 
 	tmpl.Execute(w, struct{ Requests [][]string }{requests})
@@ -52,12 +59,15 @@ func handleRequested(w http.ResponseWriter, r *http.Request) {
 func setupRoutes() {
 	http.HandleFunc("/", handleForm)
 	http.HandleFunc("/requested", handleRequested)
-	http.ListenAndServe(":8080", nil)
+	err := http.ListenAndServe(config.Listen, nil)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
 }
 
 func insertEntry(entry string) {
-	f, err := os.OpenFile("requests.txt",
-		os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	f, err := os.OpenFile(config.RequestsFile, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
 	if err != nil {
 		log.Println(err)
 	}
@@ -69,5 +79,12 @@ func insertEntry(entry string) {
 }
 
 func main() {
+	requestsFile := flag.String("requests", "./requests.txt", "Where the file containing all the requests is")
+	listen := flag.String("listen", ":8080", "The listen address and port")
+	flag.Parse()
+
+	config.RequestsFile = *requestsFile
+	config.Listen = *listen
+
 	setupRoutes()
 }