build: use cross-platform hook installation with shelljs

.github/CONTRIBUTING.md

@@ -43,7 +43,10 @@ After cloning the repo, run:
 $ npm install
 ```
 
-This would also run the `postinstall` script which will link git commit hooks if you are on a Unix-like system.
+This will also run the `postinstall` script which links two git hooks:
+
+- `pre-commit`: runs ESLint on staged files.
+- `commit-msg`: validates commit message format (see below).
 
 ### Commiting Changes
 

build/install-hooks.js

@@ -0,0 +1,8 @@
+const { test, ln, chmod } = require('shelljs')
+
+if (test('-e', '.git/hooks')) {
+  ln('-sf', '../../build/git-hooks/pre-commit', '.git/hooks/pre-commit')
+  chmod('+x', '.git/hooks/pre-commit')
+  ln('-sf', '../../build/git-hooks/commit-msg', '.git/hooks/commit-msg')
+  chmod('+x', '.git/hooks/commit-msg')
+}

package.json

@@ -38,7 +38,7 @@
     "release": "bash build/release.sh",
     "release:weex": "bash build/release-weex.sh",
     "release:note": "node build/gen-release-note.js",
-    "postinstall": "bash build/install-hooks.sh",
+    "postinstall": "node build/install-hooks.js",
     "commit": "git-cz"
   },
   "repository": {
@@ -117,6 +117,7 @@
     "rollup-watch": "^4.0.0",
     "selenium-server": "^2.53.1",
     "serialize-javascript": "^1.3.0",
+    "shelljs": "^0.7.8",
     "typescript": "^2.3.4",
     "uglify-js": "^3.0.15",
     "webpack": "^2.6.1",

yarn.lock

@@ -4824,6 +4824,14 @@ shelljs@0.7.6, shelljs@^0.7.5:
     interpret "^1.0.0"
     rechoir "^0.6.2"
 
+shelljs@^0.7.8:
+  version "0.7.8"
+  resolved "https://registry.yarnpkg.com/shelljs/-/shelljs-0.7.8.tgz#decbcf874b0d1e5fb72e14b164a9683048e9acb3"
+  dependencies:
+    glob "^7.0.0"
+    interpret "^1.0.0"
+    rechoir "^0.6.2"
+
 signal-exit@^3.0.0:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.2.tgz#b5fdc08f1287ea1178628e415e25132b73646c6d"