adds .local/share/millennium and easyeffects

.local/share/millennium/plugins/extendium/backend/install_extension/utils.lua

@@ -0,0 +1,24 @@
+-- Utility helpers for extension installation
+
+local M = {}
+
+-- Helper to create empty arrays that serialize as [] not {}
+-- cjson treats tables with no elements ambiguously, this ensures array serialization
+function M.empty_array()
+    local arr = {}
+    setmetatable(arr, { __jsontype = "array" })
+    return arr
+end
+
+-- Ensure nested table path exists, creating tables as needed
+-- Usage: ensure_nested(t, "a", "b", "c") ensures t.a.b.c exists
+function M.ensure_nested(t, ...)
+    local current = t
+    for _, key in ipairs({...}) do
+        if not current[key] then current[key] = {} end
+        current = current[key]
+    end
+    return current
+end
+
+return M