Add flag for passing config file

config.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"github.com/BurntSushi/toml"
+	"os"
+)
+
+type Config struct {
+	Quays []Quay
+}
+
+func ReadConfigFromFile(filename string) (Config, error) {
+	var conf Config
+
+	contents, err := os.ReadFile(filename)
+	if err != nil {
+		return conf, err
+	}
+
+	_, err = toml.Decode(string(contents), &conf)
+	return conf, err
+}

go.mod

@@ -1,3 +1,5 @@
 module git.jasperbok.nl/jasperbok/busdepartures.git
 
 go 1.20
+
+require github.com/BurntSushi/toml v1.3.2

go.sum

@@ -0,0 +1,2 @@
+github.com/BurntSushi/toml v1.3.2 h1:o7IhLm0Msx3BaB+n3Ag7L8EVlByGnpq14C4YWiu/gL8=
+github.com/BurntSushi/toml v1.3.2/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=

main.go

@@ -2,18 +2,35 @@ package main
 
 import (
 	"flag"
+	"fmt"
 	"net/http"
+	"os"
 )
 
 var BusClient *http.Client
-var Quays []Quay = []Quay{}
+var Quays []Quay
 
 func main() {
+	var confFilename string
 	var port int
 
+	flag.StringVar(&confFilename, "c", "", "Path to the configuration file")
 	flag.IntVar(&port, "p", 4444, "The port to start the server on")
 	flag.Parse()
 
+	if confFilename == "" {
+		fmt.Printf("No configuation file provided. Provide the path to a configuration file with the -c flag.\n")
+		os.Exit(0)
+	}
+
+	conf, err := ReadConfigFromFile(confFilename)
+	if err != nil {
+		fmt.Printf("%v\n", err)
+		os.Exit(1)
+	}
+
+	Quays = conf.Quays
+
 	BusClient = &http.Client{}
 	serveHttp(port)
 }

quay.go

@@ -6,10 +6,10 @@ import (
 )
 
 type Quay struct {
-	ID               string `json:"quayid"`
+	ID               string  `json:"quayid" toml:"id"`
-	Name             string `json:"name"`
+	Name             string  `json:"name" toml:"name"`
-	Town             string `json:"town"`
+	Town             string  `json:"town" toml:"town"`
-	RoutesOfInterest []Route
+	RoutesOfInterest []Route `toml:"routes_of_interest"`
 }
 
 func (q Quay) IsInterestingDeparture(d Departure) bool {

route.go

@@ -1,6 +1,6 @@
 package main
 
 type Route struct {
-	RouteShortName string `json:"route_short_name"`
+	RouteShortName string `json:"route_short_name" toml:"short_name"`
-	RouteLongName  string `json:"route_long_name"`
+	RouteLongName  string `json:"route_long_name" toml:"long_name"`
 }