Expose decoder list API and populate UI

cmd/sdrd/main.go

@@ -9,6 +9,7 @@ import (
 	"os"
 	"os/signal"
 	"path/filepath"
+	"sort"
 	"strconv"
 	"strings"
 	"sync"
@@ -516,6 +517,11 @@ func main() {
 		_ = json.NewEncoder(w).Encode(sigSnap.get())
 	})
 
+	http.HandleFunc("/api/decoders", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		_ = json.NewEncoder(w).Encode(decoderKeys(cfgManager.Snapshot()))
+	})
+
 	http.HandleFunc("/api/recordings", func(w http.ResponseWriter, r *http.Request) {
 		if r.Method != http.MethodGet {
 			http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
@@ -825,6 +831,16 @@ func buildDecoderMap(cfg config.Config) map[string]string {
 	return out
 }
 
+func decoderKeys(cfg config.Config) []string {
+	m := buildDecoderMap(cfg)
+	keys := make([]string, 0, len(m))
+	for k := range m {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	return keys
+}
+
 func parseSince(raw string) (time.Time, error) {
 	if raw == "" {
 		return time.Time{}, nil

web/app.js

@@ -1276,6 +1276,29 @@ window.addEventListener('keydown', (ev) => {
   }
 });
 
+loadConfig();
+loadStats();
+loadGPU();
+fetchEvents(true);
+fetchRecordings();
+loadDecoders();
+connect();
+requestAnimationFrame(renderLoop);
+setInterval(loadStats, 1000);
+setInterval(loadGPU, 1000);
+setInterval(() => fetchEvents(false), 2000);
+setInterval(fetchRecordings, 5000);
+setInterval(loadSignals, 1500);
+setInterval(loadDecoders, 10000);
+lse if (ev.key === 'ArrowLeft') {
+    pan = Math.max(-0.5, pan - 0.04);
+    followLive = false;
+  } else if (ev.key === 'ArrowRight') {
+    pan = Math.min(0.5, pan + 0.04);
+    followLive = false;
+  }
+});
+
 loadConfig();
 loadStats();
 loadGPU();