feat: add portctl plugin (#24)

portctl/widget.luau

@@ -0,0 +1,40 @@
+--!nonstrict
+-- portctl — bar widget.
+-- Count syncs with panel filters (portctl_visible_count).
+-- Falls back to service total when panel not open.
+
+local visibleCount = nil  -- set by panel on each render
+
+local function applyCount(n)
+  barWidget.setVisible(n > 0)
+  barWidget.setGlyph(noctalia.getConfig("glyph") or "plug")
+  barWidget.setText(tostring(n))
+end
+
+-- Panel publishes filtered count on every render
+noctalia.state.watch("portctl_visible_count", function(n)
+  visibleCount = n
+  applyCount(n or 0)
+end)
+
+-- Service publishes stats; use count_tcp (matches panel default: TCP only)
+noctalia.state.watch("portctl_stats", function(stats)
+  if visibleCount ~= nil then return end  -- panel count takes priority
+  local n = (stats and stats.count_tcp) or (stats and stats.count) or 0
+  applyCount(n)
+end)
+
+-- Cold start: apply whatever is already in state
+local v = noctalia.state.get("portctl_visible_count")
+if v ~= nil then
+  visibleCount = v
+  applyCount(v)
+else
+  local stats = noctalia.state.get("portctl_stats")
+  local n = (stats and stats.count_tcp) or (stats and stats.count) or 0
+  applyCount(n)
+end
+
+function onClick()
+  noctalia.togglePanel("rxtsel/portctl:panel")
+end