From 1aa378d930c1fb9fd827a866ccdc4d4e6184785f Mon Sep 17 00:00:00 2001
From: Bartek Fabiszewski <github@fabiszewski.net>
Date: Tue, 7 Apr 2020 19:21:29 +0200
Subject: [PATCH] Pre-commit build script

---
 .githooks/build-staged.js | 48 +++++++++++++++++++++++++++++++++++++++
 js/dist/.gitignore        |  3 +--
 package.json              |  6 ++---
 3 files changed, 52 insertions(+), 5 deletions(-)
 create mode 100644 .githooks/build-staged.js

diff --git a/.githooks/build-staged.js b/.githooks/build-staged.js
new file mode 100644
index 0000000..cbfefcf
--- /dev/null
+++ b/.githooks/build-staged.js
@@ -0,0 +1,48 @@
+/*
+ * μlogger
+ *
+ * Copyright(C) 2020 Bartek Fabiszewski (www.fabiszewski.net)
+ *
+ * This is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+const fs = require('fs');
+const crypto = require('crypto');
+const exec = require('child_process').execSync;
+
+const getBundleHash = () => {
+  const distDir = 'js/dist/';
+  const hash = crypto.createHash('sha1');
+  fs.readdirSync(distDir)
+    .filter(path => path.endsWith('.js'))
+    .sort()
+    .forEach(path => {
+      hash.update(fs.readFileSync(distDir + path));
+    });
+  return hash.digest('hex');
+};
+
+const main = () => {
+  const bundleHash = getBundleHash();
+  try {
+    exec('npm run build');
+    if (getBundleHash() !== bundleHash) {
+      exec('git add js/dist/*');
+    }
+  } catch (e) {
+    console.log('Warning: build failed!');
+  }
+};
+
+main();
diff --git a/js/dist/.gitignore b/js/dist/.gitignore
index 83929f8..1de5ba0 100644
--- a/js/dist/.gitignore
+++ b/js/dist/.gitignore
@@ -1,4 +1,3 @@
 *
 !.gitignore
-!1.bundle.js*
-!bundle.js*
+!*bundle.js*
\ No newline at end of file
diff --git a/package.json b/package.json
index 8951632..cd8980d 100644
--- a/package.json
+++ b/package.json
@@ -88,10 +88,10 @@
   ],
   "husky": {
     "hooks": {
-      "pre-push": "prepush-if-changed"
+      "pre-commit": "lint-staged"
     }
   },
-  "prepush-if-changed": {
-    "(js/src/**/*.js|package?(-lock).json)": "npm run build"
+  "lint-staged": {
+    "js/src/**/*.js": "node .githooks/build-staged.js"
   }
 }