Documentation pt. I

app/javascript/glitch/reducers/local_settings.js

@@ -1,3 +1,32 @@
+/*
+
+`reducers/local_settings`
+========================
+
+>   For more information on the contents of this file, please contact:
+>
+>   - kibigo! [@kibi@glitch.social]
+
+This file provides our Redux reducers related to local settings. The
+associated actions are:
+
+ -  __`STORE_HYDRATE` :__
+    Used to hydrate the store with its initial values.
+
+ -  __`LOCAL_SETTING_CHANGE` :__
+    Used to change the value of a local setting in the store.
+
+*/
+
+                            /* * * * */
+
+/*
+
+Imports
+-------
+
+*/
+
 //  Package imports  //
 import Immutable from 'immutable';
 
@@ -7,6 +36,18 @@ import { STORE_HYDRATE } from '../../mastodon/actions/store';
 //  Our imports  //
 import { LOCAL_SETTING_CHANGE } from '../actions/local_settings';
 
+                            /* * * * */
+
+/*
+
+initialState
+------------
+
+You can see the default values for all of our local settings here.
+These are only used if no previously-saved values exist.
+
+*/
+
 const initialState = Immutable.fromJS({
   layout    : 'auto',
   stretch   : true,
@@ -30,8 +71,46 @@ const initialState = Immutable.fromJS({
   },
 });
 
+                            /* * * * */
+
+/*
+
+Helper functions
+----------------
+
+###  `hydrate(state, localSettings)`
+
+`hydrate()` is used to hydrate the `local_settings` part of our store
+with its initial values. The `state` will probably just be the
+`initialState`, and the `localSettings` should be whatever we pulled
+from `localStorage`.
+
+*/
+
 const hydrate = (state, localSettings) => state.mergeDeep(localSettings);
 
+                            /* * * * */
+
+/*
+
+`localSettings(state = initialState, action)`
+---------------------------------------------
+
+This function holds our actual reducer.
+
+If our action is `STORE_HYDRATE`, then we call `hydrate()` with the
+`local_settings` property of the provided `action.state`.
+
+If our action is `LOCAL_SETTING_CHANGE`, then we set `action.key` in
+our state to the provided `action.value`. Note that `action.key` MUST
+be an array, since we use `setIn()`.
+
+>   __Note :__
+>   We call this function `localSettings`, but its associated object
+>   in the store is `local_settings`.
+
+*/
+
 export default function localSettings(state = initialState, action) {
   switch(action.type) {
   case STORE_HYDRATE: