Move configuration code to a separate file

2 files changed, 42 insertions, 37 deletions

diff --git a/config.go b/config.go
new file mode 100644
index 0000000..3bb153b
--- /dev/null
+++ b/config.go
@@ -0,0 +1,42 @@
+package main
+
+import (
+	"encoding/json"
+	"net/netip"
+	"os"
+	"log"
+)
+
+type RuntimeConfig struct {
+	Devices DevicesConfig
+	Web     WebConfig
+}
+
+type DevicesConfig struct {
+	Hs100 []Hs100Conf
+}
+
+type WebConfig struct {
+	Listen netip.AddrPort
+}
+
+// parseConfig() parses and validates the runtime configuration file and
+// returns it as Go datastructure.
+func parseConfig(path string) RuntimeConfig {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		log.Fatalf("Could not read '%s'!", path)
+	}
+
+	if !json.Valid(data) {
+		log.Fatalf("%s contains invalid JSON!", path)
+	}
+
+	config := RuntimeConfig{}
+	err = json.Unmarshal(data, &config)
+	if err != nil {
+		log.Fatalf("Could not parse configuration file:\n%s\n", err)
+	}
+
+	return config
+}
diff --git a/main.go b/main.go
index 4331123..48a00a5 100644
--- a/main.go
+++ b/main.go
@@ -1,33 +1,17 @@
 package main
 
 import (
-	"encoding/json"
 	"embed"
 	"flag"
 	"fmt"
 	"log"
 	"net/http"
-	"net/netip"
-	"os"
 	"text/template"
 )
 
 //go:embed simple.css/simple.css templates/index.html
 var static embed.FS
 
-type RuntimeConfig struct {
-	Devices DevicesConfig
-	Web     WebConfig
-}
-
-type DevicesConfig struct {
-	Hs100 []Hs100Conf
-}
-
-type WebConfig struct {
-	Listen netip.AddrPort
-}
-
 func main() {
 	configPath := parseFlags()
 	c := parseConfig(configPath)
@@ -51,27 +35,6 @@ func parseFlags() string {
 	return r
 }
 
-// parseConfig() parses and validates the runtime configuration file and
-// returns it as Go datastructure.
-func parseConfig(path string) RuntimeConfig {
-	data, err := os.ReadFile(path)
-	if err != nil {
-		log.Fatalf("Could not read '%s'!", path)
-	}
-
-	if !json.Valid(data) {
-		log.Fatalf("%s contains invalid JSON!", path)
-	}
-
-	config := RuntimeConfig{}
-	err = json.Unmarshal(data, &config)
-	if err != nil {
-		log.Fatalf("Could not parse configuration file:\n%s\n", err)
-	}
-
-	return config
-}
-
 // index() returns a HTTP handler for the index page.
 func index(devices DevicesConfig) func(http.ResponseWriter, *http.Request) {
 	tmpl, err := template.ParseFS(static, "templates/index.html")