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client/src/js/reducers/input.js

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+import { List, Record } from 'immutable';
+import createReducer from '../util/createReducer';
+import * as actions from '../actions';
+
+const HISTORY_MAX_LENGTH = 128;
+
+const State = Record({
+  history: List(),
+  index: 0
+});
+
+export default createReducer(new State(), {
+  [actions.INPUT_HISTORY_ADD](state, action) {
+    const { line } = action;
+    if (line.trim() && line !== state.history.get(0)) {
+      if (history.length === HISTORY_MAX_LENGTH) {
+        return state.set('history', state.history.unshift(line).pop());
+      }
+
+      return state.set('history', state.history.unshift(line));
+    }
+
+    return state;
+  },
+
+  [actions.INPUT_HISTORY_RESET](state) {
+    return state.set('index', -1);
+  },
+
+  [actions.INPUT_HISTORY_INCREMENT](state) {
+    if (state.index < state.history.size - 1) {
+      return state.set('index', state.index + 1);
+    }
+
+    return state;
+  },
+
+  [actions.INPUT_HISTORY_DECREMENT](state) {
+    if (state.index >= 0) {
+      return state.set('index', state.index - 1);
+    }
+
+    return state;
+  }
+});