feat: npm package @crudy/pgmorbac ships the extension SQL

The package carries the install and upgrade scripts, built from src/ on prepack
(sql/ is not committed), with extensionSql(), upgradeScripts(), version and sqlDir.

index.js

@@ -0,0 +1,32 @@
+import { readFileSync, readdirSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+
+const root = dirname(fileURLToPath(import.meta.url));
+
+export const controlFile = join(root, 'pgmorbac.control');
+export const sqlDir = join(root, 'sql');
+
+const control = readFileSync(controlFile, 'utf8').match(/default_version\s*=\s*'([^']+)'/);
+if (!control) throw new Error('[pgmorbac] pgmorbac.control has no default_version');
+export const version = control[1];
+
+/** The install script pgmorbac--<version>.sql, as CREATE EXTENSION would run it. */
+export function extensionSql() {
+    return readFileSync(join(sqlDir, `pgmorbac--${version}.sql`), 'utf8');
+}
+
+const semver = (v) => v.split('.').map(Number);
+const byFrom = (a, b) => {
+    const [x, y] = [semver(a.from), semver(b.from)];
+    return x[0] - y[0] || x[1] - y[1] || x[2] - y[2];
+};
+
+/** Upgrade scripts pgmorbac--<from>--<to>.sql, in version order. */
+export function upgradeScripts() {
+    return readdirSync(sqlDir)
+        .map((filename) => ({ filename, m: /^pgmorbac--(\d+\.\d+\.\d+)--(\d+\.\d+\.\d+)\.sql$/.exec(filename) }))
+        .filter(({ m }) => m)
+        .map(({ filename, m }) => ({ from: m[1], to: m[2], filename, sql: readFileSync(join(sqlDir, filename), 'utf8') }))
+        .sort(byFrom);
+}