1 files changed, 61 insertions, 0 deletions
diff --git a/scripts/build-version.js b/scripts/build-version.js
new file mode 100755
index 0000000..0d77f7d
--- /dev/null
+++ b/scripts/build-version.js
@@ -0,0 +1,61 @@
+#!/usr/bin/env node
+
+const fs = require("fs");
+const path = require("path");
+const versionFile = path.join("build", "version.json");
+const indexFile = path.join("build", "index.html");
+
+const versionDate = (date) => date.toISOString().replace(".000", "");
+
+const commitHash = () => {
+  try {
+    return require("child_process")
+      .execSync("git rev-parse --short HEAD")
+      .toString()
+      .trim();
+  } catch {
+    return "none";
+  }
+};
+
+const commitDate = (hash) => {
+  try {
+    const unix = require("child_process")
+      .execSync(`git show -s --format=%ct ${hash}`)
+      .toString()
+      .trim();
+    const date = new Date(parseInt(unix) * 1000);
+    return versionDate(date);
+  } catch {
+    return versionDate(new Date());
+  }
+};
+
+const getFullVersion = () => {
+  const hash = commitHash();
+  return `${commitDate(hash)}-${hash}`;
+};
+
+const data = JSON.stringify(
+  {
+    version: getFullVersion(),
+  },
+  undefined,
+  2,
+);
+
+fs.writeFileSync(versionFile, data);
+
+// https://stackoverflow.com/a/14181136/8418
+fs.readFile(indexFile, "utf8", (error, data) => {
+  if (error) {
+    return console.error(error);
+  }
+  const result = data.replace(/{version}/g, getFullVersion());
+
+  fs.writeFile(indexFile, result, "utf8", (error) => {
+    if (error) {
+      return console.error(error);
+    }
+  });
+});