make cava a singleton

Services/CavaService.qml

@@ -0,0 +1,53 @@
+pragma Singleton
+pragma ComponentBehavior: Bound
+
+import QtQuick
+import Quickshell
+import Quickshell.Io
+
+Singleton {
+    id: root
+
+    property list<int> values: Array(6)
+    property int refCount: 0
+    property bool cavaAvailable: false
+
+    Process {
+        id: cavaCheck
+
+        command: ["which", "cava"]
+        running: true
+        onExited: (exitCode) => {
+            root.cavaAvailable = exitCode === 0;
+        }
+    }
+
+    Process {
+        id: cavaProcess
+
+        running: root.cavaAvailable && root.refCount > 0
+        command: ["sh", "-c", `printf '[general]\\nmode=normal\\nframerate=25\\nautosens=0\\nsensitivity=30\\nbars=6\\nlower_cutoff_freq=50\\nhigher_cutoff_freq=12000\\n[output]\\nmethod=raw\\nraw_target=/dev/stdout\\ndata_format=ascii\\nchannels=mono\\nmono_option=average\\n[smoothing]\\nnoise_reduction=35\\nintegral=90\\ngravity=95\\nignore=2\\nmonstercat=1.5' | cava -p /dev/stdin`]
+        
+        onRunningChanged: {
+            if (!running) {
+                root.values = Array(6).fill(0);
+            }
+        }
+
+        stdout: SplitParser {
+            splitMarker: "\n"
+            onRead: (data) => {
+                if (root.refCount > 0 && data.trim()) {
+                    let points = data.split(";").map((p) => {
+                        return parseInt(p.trim(), 10);
+                    }).filter((p) => {
+                        return !isNaN(p);
+                    });
+                    if (points.length >= 6) {
+                        root.values = points.slice(0, 6);
+                    }
+                }
+            }
+        }
+    }
+}