feat: add shelly plugin (#2)

* feat: add shelly plugin

* docs: document click action

* add license

* feat: add setting to hide when there are no updates

* remove some tags

* address tags feedback

* Update tags in plugin.toml for clarity

---------

Co-authored-by: Lemmy <studio@quadbyte.net>

shelly/poller.luau

@@ -0,0 +1,57 @@
+--!nonstrict
+
+type Update = { Name: string, Version: string, OldVersion: string?, DownloadSize: string? }
+
+type UpdateResult = {
+    Packages: { [number]: Update },
+    Aur: { [number]: Update },
+    Flatpak: { [number]: Update },
+}
+
+local updates: UpdateResult = { Packages = {}, Aur = {}, Flatpak = {} }
+local updateError: string | nil = nil
+local updateInterval = (noctalia.getConfig("interval") or 300)*1000
+local isPolling = false
+
+noctalia.setUpdateInterval(updateInterval)
+
+function refresh()
+  isPolling = true
+
+  noctalia.runAsync("shelly check-updates --json", function(result)
+    isPolling = false
+
+    if result.exitCode ~= 0 then
+        updateError = result.stderr
+        noctalia.state.set("updates", nil)
+        noctalia.state.set("update_error", updateError)
+        return
+    end
+
+    local decoded = noctalia.json.decode(result.stdout)
+    if type(decoded) ~= "table" then
+        updateError = noctalia.tr("bar.tooltip.error.decode_json")
+        noctalia.state.set("update_error", updateError)
+        return
+    end
+
+    updates = {
+        Packages = decoded.Packages or {},
+        Aur = decoded.Aur or {},
+        Flatpak = decoded.Flatpak or {},
+    }
+
+    noctalia.state.set("updates", updates)
+    noctalia.state.set("update_error", nil)
+  end)
+end
+
+function update()
+  if isPolling then
+    return
+  end
+
+  refresh()
+end
+
+refresh()