Support Many Kinds of Projects

Resolves ember-template-lint#381

lib/commands/print-failing.js

@@ -12,19 +12,47 @@ module.exports = {
 
   availableOptions: [],
 
-  run() {
+  appRoot() {
+    let project = this.project;
+    let appRoot;
+
+    if (project.isEmberCLIAddon()) {
+      return 'addon';
+    } else if (project.isModuleUnification()) {
+      return 'src';
+    } else {
+      return 'app';
+    }
+  },
+
+  _scanForHbsFiles(dir) {
+    return walkSync(dir, { globs: ['**/*.hbs'] });
+  },
+
+  getTemplateFiles() {
     let project = this.project;
+    let appRoot = this.appRoot();
+
+    if (project.isEmberCLIAddon()) {
+      let files = this._scanForHbsFiles(appRoot);
+      let moreFiles = this._scanForHbsFiles('tests/dummy/app');
+
+      return files.concat(moreFiles);
+    } else if (project.isModuleUnification()) {
+      return this._scanForHbsFiles(appRoot);
+    } else {
+      return this._scanForHbsFiles(appRoot);
+    }
+  },
+
+  run() {
+    let appRoot = this.appRoot();
     let modulePrefix = project.config().modulePrefix;
     let linter = new Linter();
     let templatesWithErrors = [];
 
-    let templateFiles = walkSync('app').filter(file => {
-      // remove any non-hbs files
-      return path.extname(file) === '.hbs';
-    });
-
     templateFiles.forEach(file => {
-      let filePath = path.join('app', file);
+      let filePath = path.join(appRoot, file);
       let contents = fs.readFileSync(filePath, { encoding: 'utf8' });
       let moduleId = path.join(modulePrefix, file).slice(0, -4);