Add --version flag with build-time version injection via tsdown

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: theoephraim

packages/bumpy/src/cli.ts

@@ -2,6 +2,7 @@
 
 import { findRoot } from './core/config.ts';
 import { log, colorize } from './utils/logger.ts';
+import { getVersion } from './version-info.ts';
 
 const args = process.argv.slice(2);
 const command = args[0];
@@ -143,6 +144,11 @@ async function main() {
         break;
       }
 
+      case '--version':
+      case '-v':
+        console.log(`bumpy ${getVersion()}`);
+        break;
+
       case 'help':
       case '--help':
       case '-h':
@@ -163,7 +169,7 @@ async function main() {
 
 function printHelp() {
   console.log(`
-  ${colorize('🐸 bumpy', 'bold')} - Modern monorepo versioning
+  ${colorize(`🐸 bumpy v${getVersion()}`, 'bold')} - Modern monorepo versioning
 
   Usage: bumpy <command> [options]
 

packages/bumpy/src/version-info.ts

@@ -0,0 +1,6 @@
+declare const __BUMPY_VERSION__: string | undefined;
+
+/** Get the bumpy version. Injected at build time by tsdown, falls back to "dev" when running from source. */
+export function getVersion(): string {
+  return typeof __BUMPY_VERSION__ !== 'undefined' ? __BUMPY_VERSION__ : 'dev';
+}

packages/bumpy/tsdown.config.ts

@@ -1,4 +1,7 @@
 import { defineConfig } from 'tsdown';
+import { readFileSync } from 'node:fs';
+
+const pkg = JSON.parse(readFileSync('./package.json', 'utf-8'));
 
 export default defineConfig({
   entry: {
@@ -8,4 +11,7 @@ export default defineConfig({
   format: 'esm',
   dts: true,
   clean: true,
+  define: {
+    __BUMPY_VERSION__: JSON.stringify(pkg.version),
+  },
 });