WIP - add extractor, generate snippet_data

node_modules/trough/wrap.js

@@ -0,0 +1,64 @@
+'use strict'
+
+var slice = [].slice
+
+module.exports = wrap
+
+// Wrap `fn`.
+// Can be sync or async; return a promise, receive a completion handler, return
+// new values and errors.
+function wrap(fn, callback) {
+  var invoked
+
+  return wrapped
+
+  function wrapped() {
+    var params = slice.call(arguments, 0)
+    var callback = fn.length > params.length
+    var result
+
+    if (callback) {
+      params.push(done)
+    }
+
+    try {
+      result = fn.apply(null, params)
+    } catch (error) {
+      // Well, this is quite the pickle.
+      // `fn` received a callback and invoked it (thus continuing the pipeline),
+      // but later also threw an error.
+      // We’re not about to restart the pipeline again, so the only thing left
+      // to do is to throw the thing instead.
+      if (callback && invoked) {
+        throw error
+      }
+
+      return done(error)
+    }
+
+    if (!callback) {
+      if (result && typeof result.then === 'function') {
+        result.then(then, done)
+      } else if (result instanceof Error) {
+        done(result)
+      } else {
+        then(result)
+      }
+    }
+  }
+
+  // Invoke `next`, only once.
+  function done() {
+    if (!invoked) {
+      invoked = true
+
+      callback.apply(null, arguments)
+    }
+  }
+
+  // Invoke `done` with one value.
+  // Tracks if an error is passed, too.
+  function then(value) {
+    done(null, value)
+  }
+}