Update dependencies, tests...

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node: [10, 12, 14]
+        node: [12, 14, 16]
         os: [ubuntu-latest, windows-latest]
 
     steps:

lib/grunt/file.js

@@ -292,8 +292,11 @@ file.write = function(filepath, contents, options) {
 // Read a file, optionally processing its content, then write the output.
 // Or read a directory, recursively creating directories, reading files,
 // processing content, writing output.
+// Handles symlinks by coping them as files or directories.
 file.copy = function copy(srcpath, destpath, options) {
-  if (file.isDir(srcpath)) {
+  if (file._isSymbolicLink(srcpath)) {
+    file._copySymbolicLink(srcpath, destpath);
+  } else if (file.isDir(srcpath)) {
     // Copy a directory, recursively.
     // Explicitly create new dest directory.
     file.mkdir(destpath);
@@ -449,6 +452,28 @@ file.isPathCwd = function() {
   }
 };
 
+file._isSymbolicLink = function() {
+  var filepath = path.join.apply(path, arguments);
+  return fs.lstatSync(filepath).isSymbolicLink();
+};
+
+file._copySymbolicLink = function(srcpath, destpath) {
+  var destdir = path.join(destpath, '..');
+  var fileBase = path.basename(srcpath);
+  // Use the correct relative path for the symlink
+  if (!grunt.file.isPathAbsolute(srcpath)) {
+    srcpath = path.relative(destdir, srcpath) || '.';
+  }
+  file.mkdir(destdir);
+  var mode = grunt.file.isDir(srcpath) ? 'dir' : 'file';
+  var destpath = path.join(destpath, fileBase);
+  if (fs.existsSync(destpath)) {
+    // skip symlink if file already exists
+    return;
+  }
+  return fs.symlinkSync(srcpath, destpath, mode);
+};
+
 // Test to see if a filepath is contained within the CWD.
 file.isPathInCwd = function() {
   var filepath = path.join.apply(path, arguments);

package.json

@@ -42,7 +42,7 @@
     "exit": "~0.1.2",
     "findup-sync": "~0.3.0",
     "glob": "~7.1.6",
-    "grunt-cli": "~1.4.2",
+    "grunt-cli": "~1.4.3",
     "grunt-known-options": "~2.0.0",
     "grunt-legacy-log": "~3.0.0",
     "grunt-legacy-util": "~2.0.1",
@@ -56,7 +56,7 @@
   "devDependencies": {
     "difflet": "~1.0.1",
     "eslint-config-grunt": "~1.0.1",
-    "grunt-contrib-nodeunit": "~3.0.0",
+    "grunt-contrib-nodeunit": "~4.0.0",
     "grunt-contrib-watch": "~1.1.0",
     "grunt-eslint": "~18.1.0",
     "temporary": "~0.0.4",

test/grunt/file_test.js

@@ -893,5 +893,27 @@ exports.file = {
       test.ok(grunt.file.isPathInCwd(path.resolve('deep')), 'subdirectory is in cwd');
       test.done();
     },
+    'symbolicLinkCopy': function(test) {
+      test.expect(4);
+      var srcfile = new Tempdir();
+      fs.symlinkSync(path.resolve('test/fixtures/octocat.png'), path.join(srcfile.path, 'octocat.png'), 'file');
+      // test symlink copy for files
+      var destdir = new Tempdir();
+      grunt.file.copy(path.join(srcfile.path, 'octocat.png'), destdir.path);
+      test.ok(fs.lstatSync(path.join(srcfile.path, 'octocat.png')).isSymbolicLink());
+      test.ok(fs.lstatSync(path.join(destdir.path, 'octocat.png')).isSymbolicLink());
+
+      // test symlink copy for directories
+      var srcdir = new Tempdir();
+      var destdir = new Tempdir();
+      var fixtures = path.resolve('test/fixtures');
+      var symlinkSource = path.join(srcdir.path, path.basename(fixtures));
+      fs.symlinkSync(fixtures, symlinkSource, 'dir');
+
+      grunt.file.copy(symlinkSource, destdir.path);
+      test.ok(fs.lstatSync(symlinkSource).isSymbolicLink());
+      test.ok(fs.lstatSync(path.join(destdir.path, path.basename(fixtures))).isSymbolicLink());
+      test.done();
+    },
   }
 };