Add eslint config and run eslint if installed

.eslintignore

@@ -0,0 +1 @@
+assets/static/lru.js

.eslintrc.yaml

@@ -0,0 +1,27 @@
+env:
+  browser: true
+  jquery: true
+extends:
+  - eslint:recommended
+rules:
+  indent:
+    - error
+    - 4
+  linebreak-style:
+    - error
+    - unix
+  quotes:
+    - error
+    - double
+  array-bracket-spacing:
+    - warn
+    - always
+  block-spacing:
+    - warn
+    - always
+  brace-style:
+    - warn
+    - 1tbs
+  camelcase: warn
+  no-console: off
+  no-use-before-define: error

.travis.yml

@@ -6,15 +6,11 @@ go:
 
 go_import_path: github.com/cloudflare/unsee
 
-# nodejs is needed so that we can install jshint
-addons:
-  apt:
-    packages:
-      - nodejs
-
-# install jshint, it's used for linting js files (needs nodejs)
+# install jshint & eslint, it's used for linting js files (needs nodejs)
 before_script:
+  - nvm install 6
   - npm install jshint
+  - npm install eslint
 
 script:
   - make test

Makefile

@@ -19,8 +19,9 @@ ifdef DEBUG
 	DOCKER_ARGS = -v $(CURDIR)/assets:$(CURDIR)/assets:ro
 endif
 
-# detect if jshint is installed
+# detect if jshint and/or eslint is installed
 JSHINT := $(shell which jshint)
+ESLINT := $(shell which eslint)
 
 .DEFAULT_GOAL := $(NAME)
 
@@ -81,6 +82,9 @@ lint: .build/deps.ok
 ifneq ($(JSHINT),)
 	@$(JSHINT) assets/static/*.js
 endif
+ifneq ($(ESLINT),)
+	@$(ESLINT) assets/static/*.js
+endif
 
 .PHONY: test
 test: lint bindata_assetfs.go