feat: support less v4

.gitignore

@@ -19,3 +19,5 @@ node_modules
 .travis.yml
 test
 examples
+.idea
+yarn.lock

README.md

@@ -22,7 +22,7 @@
 </tr>
 <tr>
 <td>Less Version</td>
-<td>2.x | 3.7+</td>
+<td>3.7+ | 4.0+</td>
 </tr>
 <tr>
 <td>Gulp Version</td>

index.js

@@ -1,12 +1,63 @@
+var fs             = require('fs');
 var path           = require('path');
-var accord         = require('accord');
+var less           = require('less');
 var through2       = require('through2');
 var replaceExt     = require('replace-ext');
 var assign         = require('object-assign');
 var applySourceMap = require('vinyl-sourcemaps-apply');
 var PluginError    = require('plugin-error');
 
-var less           = accord.load('less');
+function inlineSources(map) {
+  if (map.sourcesContent) {
+    return Promise.resolve(map);
+  }
+
+  return Promise.all(
+    map.sources.map(function (source) {
+      return new Promise(function (resolve, reject) {
+        fs.readFile(source, 'utf8', function (err, data) {
+          if (err) {
+            reject(err);
+          } else {
+            resolve(data);
+          }
+        });
+      });
+    })
+  ).then(
+    function (contents) {
+      map.sourcesContent = contents;
+      return map;
+    },
+    function () {
+      return map;
+    }
+  );
+}
+
+function renderLess(str, opts) {
+  return new Promise(function (resolve, reject) {
+    less.render(str, opts, function (err, res) {
+      if (err) {
+        reject(err);
+      } else {
+        var obj = {
+          result: res.css,
+          imports: res.imports,
+        };
+        if (opts.sourceMap && res.map) {
+          obj.sourcemap = JSON.parse(res.map);
+          inlineSources(obj.sourcemap).then(function (map) {
+            obj.sourcemap = map;
+            resolve(obj);
+          });
+        } else {
+          resolve(obj);
+        }
+      }
+    });
+  });
+}
 
 module.exports = function (options) {
   // Mixes in default options.
@@ -15,7 +66,7 @@ module.exports = function (options) {
     paths: []
   }, options);
 
-  return through2.obj(function(file, enc, cb) {
+  return through2.obj(function (file, enc, cb) {
     if (file.isNull()) {
       return cb(null, file);
     }
@@ -30,11 +81,11 @@ module.exports = function (options) {
     opts.filename = file.path;
 
     // Bootstrap source maps
-    if (file.sourceMap) {
-      opts.sourcemap = true;
+    if (file.sourceMap || opts.sourcemap) {
+      opts.sourceMap = true;
     }
 
-    less.render(str, opts).then(function(res) {
+    renderLess(str, opts).then(function(res) {
       file.contents = new Buffer(res.result);
       file.path = replaceExt(file.path, '.css');
       if (res.sourcemap) {

package.json

@@ -21,8 +21,7 @@
   "author": "Chris Cowan",
   "license": "MIT",
   "dependencies": {
-    "accord": "^0.29.0",
-    "less": "2.6.x || ^3.7.1",
+    "less": "^3.7.1 || ^4.0.0",
     "object-assign": "^4.0.1",
     "plugin-error": "^0.1.2",
     "replace-ext": "^1.0.0",