2 files changed, 32 insertions, 0 deletions
diff --git a/packages/gitbook-plugin-fontsettings/src/reducers/font.js b/packages/gitbook-plugin-fontsettings/src/reducers/font.js
new file mode 100644
index 0000000..fff582d
--- /dev/null
+++ b/packages/gitbook-plugin-fontsettings/src/reducers/font.js
@@ -0,0 +1,29 @@
+const GitBook = require('gitbook-core');
+const { Record } = GitBook.Immutable;
+
+const { TYPES } = require('../actions/font');
+
+const FontState = Record({
+    fontSize: 1
+});
+
+module.exports = (state = FontState(), action) => {
+    switch (action.type) {
+
+    case TYPES.RESET:
+        return FontState();
+
+    case TYPES.INCREASE:
+        return state.merge({
+            fontSize: state.fontSize + 1
+        });
+
+    case TYPES.DECREASE:
+        return state.merge({
+            fontSize: state.fontSize + 1
+        });
+
+    default:
+        return state;
+    }
+};
diff --git a/packages/gitbook-plugin-fontsettings/src/reducers/index.js b/packages/gitbook-plugin-fontsettings/src/reducers/index.js
new file mode 100644
index 0000000..64d60c9
--- /dev/null
+++ b/packages/gitbook-plugin-fontsettings/src/reducers/index.js
@@ -0,0 +1,3 @@
+const GitBook = require('gitbook-core');
+
+module.exports = GitBook.createReducer('font', require('./font'));