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app/javascript/gabsocial/reducers/status_revisions.js

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+import { Map as ImmutableMap, List as ImmutableList, fromJS } from 'immutable'
+import {
+  STATUS_REVISIONS_LOAD,
+  STATUS_REVISIONS_LOAD_SUCCESS,
+  STATUS_REVISIONS_LOAD_FAIL
+} from '../actions/status_revisions'
+
+const initialState = ImmutableMap({
+  loading: false,
+  error: null,
+  revisions: ImmutableList(),
+})
+
+export default function statusRevisions(state = initialState, action) {
+  switch (action.type) {
+    case STATUS_REVISIONS_LOAD:
+      return initialState
+    case STATUS_REVISIONS_LOAD_SUCCESS:
+      return state.withMutations(mutable => {
+        mutable.set('loading', false)
+        mutable.set('revisions', fromJS(action.revisions).reverse())
+      })
+    case STATUS_REVISIONS_LOAD_FAIL:
+      return state.withMutations(mutable => {
+        mutable.set('loading', false)
+        mutable.set('error', action.error)
+      })
+    default:
+      return state
+  }
+}