in with the new

src/core/plugins/layout/selectors.js

@@ -0,0 +1,22 @@
+import { createSelector } from "reselect"
+import { normalizeArray } from "core/utils"
+
+const state = state => state
+
+export const current = state => state.get("layout")
+
+export const isShown = (state, thing, def) => {
+  thing = normalizeArray(thing)
+  return Boolean(state.getIn(["shown", ...thing], def))
+}
+
+export const whatMode = (state, thing, def="") => {
+  thing = normalizeArray(thing)
+  return state.getIn(["modes", ...thing], def)
+}
+
+export const showSummary = createSelector(
+  state,
+  state => !isShown(state, "editor")
+)
+