1 files changed, 56 insertions, 4 deletions
diff --git a/src/reducers/console.js b/src/reducers/console.js
index 3e63672..b9ed5b8 100644
--- a/src/reducers/console.js
+++ b/src/reducers/console.js
@@ -6,6 +6,42 @@ const defaultState = {
   commandShown: false,
   commandText: '',
   completions: [],
+  groupSelection: -1,
+  itemSelection: -1,
+};
+
+const nextSelection = (state) => {
+  if (state.groupSelection < 0) {
+    return [0, 0];
+  }
+
+  let group = state.completions[state.groupSelection];
+  if (state.groupSelection + 1 >= state.completions.length &&
+    state.itemSelection + 1 >= group.items.length) {
+    return [-1, -1];
+  }
+  if (state.itemSelection + 1 >= group.items.length) {
+    return [state.groupSelection + 1, 0];
+  }
+  return [state.groupSelection, state.itemSelection + 1];
+};
+
+const prevSelection = (state) => {
+  if (state.groupSelection < 0) {
+    return [
+      state.completions.length - 1,
+      state.completions[state.completions.length - 1].items.length - 1
+    ];
+  }
+  if (state.groupSelection === 0 && state.itemSelection === 0) {
+    return [-1, -1];
+  } else if (state.itemSelection === 0) {
+    return [
+      state.groupSelection - 1,
+      state.completions[state.groupSelection - 1].items.length - 1
+    ];
+  }
+  return [state.groupSelection, state.itemSelection - 1];
 };
 
 export default function reducer(state = defaultState, action = {}) {
@@ -17,10 +53,6 @@ export default function reducer(state = defaultState, action = {}) {
       errorShown: false,
       completions: []
     });
-  case actions.CONSOLE_SET_COMPLETIONS:
-    return Object.assign({}, state, {
-      completions: action.completions
-    });
   case actions.CONSOLE_SHOW_ERROR:
     return Object.assign({}, state, {
       errorText: action.text,
@@ -36,6 +68,26 @@ export default function reducer(state = defaultState, action = {}) {
       errorShown: false,
       commandShown: false
     });
+  case actions.CONSOLE_SET_COMPLETIONS:
+    return Object.assign({}, state, {
+      completions: action.completions,
+      groupSelection: -1,
+      itemSelection: -1,
+    });
+  case actions.CONSOLE_COMPLETION_NEXT: {
+    let next = nextSelection(state);
+    return Object.assign({}, state, {
+      groupSelection: next[0],
+      itemSelection: next[1],
+    });
+  }
+  case actions.CONSOLE_COMPLETION_PREV: {
+    let next = prevSelection(state);
+    return Object.assign({}, state, {
+      groupSelection: next[0],
+      itemSelection: next[1],
+    });
+  }
   default:
     return state;
   }