Refactor components

Implement context mechanism to pass default attributes to descendant
components.

ui/components/parameter-list.js

@@ -1,35 +1,35 @@
 "use strict";
 
-import m from "mithril";
-import { get } from "../components";
-import memoize from "../../lib/common/memoize";
+import { m } from "../components";
 
-const getChildAttrs = memoize((attrs, device) =>
-  Object.assign({}, attrs, { device: device })
-);
+export default function component() {
+  return {
+    view: vnode => {
+      const device = vnode.attrs.device;
 
-export default {
-  view: vnode => {
-    const device = vnode.attrs.device;
+      const rows = Object.values(vnode.attrs.parameters).map(parameter => {
+        const p = m.context(
+          {
+            device: device,
+            parameter: parameter.parameter
+          },
+          parameter.type || "parameter",
+          parameter
+        );
 
-    const rows = Object.values(vnode.attrs.parameters).map(parameter => {
-      const p = m(
-        get(parameter.type || "parameter"),
-        getChildAttrs(parameter, device)
-      );
+        return m(
+          "tr",
+          {
+            onupdate: vn => {
+              vn.dom.style.display = p.dom ? "" : "none";
+            }
+          },
+          m("th", parameter.label),
+          m("td", p)
+        );
+      });
 
-      return m(
-        "tr",
-        {
-          onupdate: vn => {
-            vn.dom.style.display = p.dom ? "" : "none";
-          }
-        },
-        m("th", parameter.label),
-        m("td", p)
-      );
-    });
-
-    return m("table.parameter-list", rows);
-  }
-};
+      return m("table.parameter-list", rows);
+    }
+  };
+}