Replace appdata completely by embed package

The embed package makes it useless to handle static files from the
source tree during runtime. All those files go simply to the embed.FS
variable and are thus embedded into the binary which is easier to
handle.

3 files changed, 13 insertions, 14 deletions

diff --git a/Makefile b/Makefile
index de7e4f3..c112fd9 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,6 @@ clean:
 install: all
 	install -Dm 755 build/$(PROGRAM) $(DESTDIR)$(PREFIX)/bin/$(PROGRAM)
 	install -Dm 644 config/default.json $(DESTDIR)/etc/$(PROGRAM)/config.json
-	install -Dm 644 appdata/index.html.tmpl $(DESTDIR)$(PREFIX)/share/$(PROGRAM)/index.html.tmpl
 
 debug:
-	go run *.go -c config/example.json -a appdata
+	go run *.go -c config/example.json
diff --git a/main.go b/main.go
index 5363831..adbdf34 100644
--- a/main.go
+++ b/main.go
@@ -10,15 +10,12 @@ import (
 	"log"
 	"net/http"
 	"net/netip"
-	"path/filepath"
 	"text/template"
 )
 
-//go:embed simple.css/simple.css
+//go:embed simple.css/simple.css templates/index.html
 var static embed.FS
 
-var appdata string
-
 type RuntimeConfig struct {
 	Devices DevicesConfig
 	Web     WebConfig
@@ -35,7 +32,7 @@ type WebConfig struct {
 func main() {
 	configPath := parseFlags()
 	c := parseConfig(configPath)
-	http.HandleFunc("/", index(c.Devices, appdata))
+	http.HandleFunc("/", index(c.Devices))
 	http.HandleFunc("/api", api())
 	http.Handle("/static/", http.StripPrefix("/static/",
 		http.FileServer(http.FS(static))))
@@ -50,8 +47,6 @@ func parseFlags() string {
 
 	flag.StringVar(&r, "c", "/etc/webiot/config.json",
 		"path to configuration file")
-	flag.StringVar(&appdata, "a", "/usr/share/webiot",
-		"path to static application data")
 	flag.Parse()
 
 	return r
@@ -76,13 +71,18 @@ func parseConfig(path string) RuntimeConfig {
 }
 
 // index() returns a HTTP handler for the index page.
-func index(devices DevicesConfig, appdata string) func(http.ResponseWriter, *http.Request) {
-
-	path := filepath.Join(appdata, "index.html.tmpl")
-	html := mustRender(path, devices)
+func index(devices DevicesConfig) func(http.ResponseWriter, *http.Request) {
+	tmpl, err := template.ParseFS(static, "templates/index.html")
+	if err != nil {
+		log.Fatal(err)
+	}
 
 	return func(w http.ResponseWriter, r *http.Request) {
-		fmt.Fprint(w, html)
+		err = tmpl.Execute(w, devices)
+		if err != nil {
+			http.Error(w, fmt.Sprint(err), http.StatusInternalServerError)
+			return
+		}
 	}
 }
 
diff --git a/appdata/index.html.tmpl b/templates/index.html
index c9fa2f4..c9fa2f4 100644
--- a/appdata/index.html.tmpl
+++ b/templates/index.html