Add base for calling hook on page/global

1 files changed, 26 insertions, 2 deletions

diff --git a/lib/output/callHook.js b/lib/output/callHook.js
index 0db1ff1..f6119fd 100644
--- a/lib/output/callHook.js
+++ b/lib/output/callHook.js
@@ -1,15 +1,39 @@
+var Promise = require('../utils/promise');
+
+function defaultGetArgument() {
+    return undefined;
+}
+
+function defaultHandleResult(output, result) {
+    return output;
+}
 
 /**
     Call a "global" hook for an output
 
     @param {String} name
+    @param {Function(Output) -> Mixed} getArgument
+    @param {Function(Output, result) -> Output} handleResult
     @param {Output} output
     @return {Promise<Output>}
 */
-function callHook(name, output) {
+function callHook(name, getArgument, handleResult, output) {
+    getArgument = getArgument || defaultGetArgument;
+    handleResult = handleResult || defaultHandleResult;
 
-}
+    var plugins = output.getPlugins();
 
+    return Promise(getArgument(output))
+    .then(function(arg) {
+        return Promise.reduce(plugins, function(prev, plugin) {
+            var hook = plugin.getHook(name);
 
+            return hook(prev);
+        }, arg);
+    })
+    .then(function(result) {
+        return handleResult(output, result);
+    });
+}
 
 module.exports = callHook;