1 files changed, 60 insertions, 0 deletions
diff --git a/lib/output/callHook.js b/lib/output/callHook.js
new file mode 100644
index 0000000..4914e52
--- /dev/null
+++ b/lib/output/callHook.js
@@ -0,0 +1,60 @@
+var Promise = require('../utils/promise');
+var timing = require('../utils/timing');
+var Api = require('../api');
+
+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, getArgument, handleResult, output) {
+    getArgument = getArgument || defaultGetArgument;
+    handleResult = handleResult || defaultHandleResult;
+
+    var logger = output.getLogger();
+    var plugins = output.getPlugins();
+
+    logger.debug.ln('calling hook "' + name + '"');
+
+    // Create the JS context for plugins
+    var context = Api.encodeGlobal(output);
+
+    return timing.measure(
+        'call.hook.' + name,
+
+        // Get the arguments
+        Promise(getArgument(output))
+
+        // Call the hooks in serie
+        .then(function(arg) {
+            return Promise.reduce(plugins, function(prev, plugin) {
+                var hook = plugin.getHook(name);
+                if (!hook) {
+                    return prev;
+                }
+
+                return hook.call(context, prev);
+            }, arg);
+        })
+
+        // Handle final result
+        .then(function(result) {
+            output = Api.decodeGlobal(output, context);
+            return handleResult(output, result);
+        })
+    );
+}
+
+module.exports = callHook;