Add support for rules as any trough ware

lib/index.js

@@ -25,6 +25,8 @@ var decamelize = require('decamelize');
 var sort = require('vfile-sort');
 var control = require('remark-message-control');
 var loadPlugin = require('load-plugin');
+var trough = require('trough');
+var wrapped = require('wrapped');
 var internals = require('./rules');
 
 /**
@@ -37,64 +39,32 @@ var internals = require('./rules');
  * @param {string} id - Identifier.
  * @param {Function} rule - Rule
  * @param {*} options - Options for respective rule.
- * @return {Function} - See `attach` below.
+ * @return {Function} - Trough ware.
  */
-function attachFactory(id, rule, options) {
-    /**
-     * Attach the rule to a remark instance, unless `false`
-     * is passed as an option.
-     *
-     * @return {Function?} - See `plugin` below.
-     */
-    function attach() {
-        /**
-         * Attach the rule to a remark instance, unless `false`
-         * is passed as an option.
-         *
-         * @param {Node} ast - Root node.
-         * @param {File} [file] - Virtual file.
-         * @param {Function} next - Signal end.
-         */
-        function plugin(ast, file, next) {
-            var scope = file.namespace('remark-lint');
-
-            /*
-             * Track new messages per file.
-             */
-
-            if (scope.index === undefined || scope.index === null) {
-                scope.index = file.messages.length;
-            }
+function ruleFactory(id, rule, options) {
+    var fn = wrapped(rule);
 
-            /**
-             * Add `ruleId` to each new message.
-             *
-             * @param {Error?} err - Optional failure.
-             */
-            function done(err) {
-                var messages = file.messages;
+    return function (ast, file, next) {
+        var scope = file.namespace('remark-lint');
 
-                while (scope.index < messages.length) {
-                    messages[scope.index].ruleId = id;
-                    messages[scope.index].source = SOURCE;
-
-                    scope.index++;
-                }
+        /* Track new messages per file. */
+        if (scope.index === undefined || scope.index === null) {
+            scope.index = file.messages.length;
+        }
 
-                next(err);
-            }
+        fn(ast, file, options, function (err) {
+            var messages = file.messages;
 
-            /*
-             * Invoke `rule`, with `options`
-             */
+            while (scope.index < messages.length) {
+                messages[scope.index].ruleId = id;
+                messages[scope.index].source = SOURCE;
 
-            rule(ast, file, options, done);
-        }
+                scope.index++;
+            }
 
-        return plugin;
+            next(err);
+        });
     }
-
-    return attach;
 }
 
 /**
@@ -180,6 +150,7 @@ function lint(remark, options) {
     var enable = [];
     var disable = [];
     var known = [];
+    var pipeline = trough();
     var setting;
     var id;
 
@@ -206,9 +177,19 @@ function lint(remark, options) {
             }
         }
 
-        remark.use(attachFactory(id, rules[id], setting));
+        pipeline.use(ruleFactory(id, rules[id], setting));
     }
 
+    /*
+     * Run all rules.
+     */
+
+    remark.use(function () {
+        return function (node, file, next) {
+            pipeline.run(node, file, next);
+        };
+    });
+
     /*
      * Allow comments to toggle messages.
      */

package.json

@@ -26,10 +26,12 @@
     "npm-prefix": "^1.1.1",
     "plur": "^2.0.0",
     "remark-message-control": "^2.0.0",
+    "trough": "^1.0.0",
     "unist-util-position": "^2.0.1",
     "unist-util-visit": "^1.0.0",
     "vfile-location": "^2.0.0",
-    "vfile-sort": "^1.0.0"
+    "vfile-sort": "^1.0.0",
+    "wrapped": "^1.0.1"
   },
   "files": [
     "index.js",