add a bin tool

.gitignore

@@ -0,0 +1,2 @@
+node_modules
+package-lock.json

README.md

@@ -15,9 +15,9 @@ Try out the [demo](https://http://sheetjs.com/bz2/demo).
 
 ## API
 
-### `decompress(data, crc)`
+### `decompress(data, test)`
 * `data`: `Uint8Array` - The data to be decompressed.
-* `crc`: `boolean` - Check data using CRC32. Default: `true`.
+* `test`: `boolean` - Verify integrity of compressed data. Default: `false`.
 * **Returns**: `Uint8Array`
 
 Decompresses `data`.

bz2.js

@@ -0,0 +1,43 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const { readFileSync, writeFileSync } = require('fs');
+const argv = require('minimist')(process.argv.slice(2));
+const { decompress } = require('.');
+const { version } = require('./package');
+
+if (argv.help || argv.h) {
+  process.stdout.write(`bz2 v${version}
+    usage: bz2 [flags and files in any order]
+
+    -h, --help     display this help
+    -v, --version  display software version
+    -t, --test     test compressed file integrity
+
+    if no filenames are given, bz2 decompresses from
+    standard input to standard output.
+`);
+  return;
+}
+
+if (argv.v || argv.version) {
+  process.stdout.write(`bz2 v${version}`);
+  return;
+}
+
+const [input, output] = argv._;
+const test = argv.test || argv.t;
+
+let result;
+if (input) {
+  result = decompress(readFileSync(input), test);
+} else {
+  result = decompress(readFileSync(0), test);
+}
+
+if (output) {
+  writeFileSync(output, result);
+} else {
+  process.stdout.write(result);
+}

package.json

@@ -6,6 +6,9 @@
   "directories": {
     "test": "tests"
   },
+  "bin": {
+    "bz2": "./bz2.js"
+  },
   "scripts": {
     "test": "node test.js"
   },
@@ -18,5 +21,8 @@
   "bugs": {
     "url": "https://github.com/sheetjs/bz2/issues"
   },
-  "homepage": "https://github.com/sheetjs/bz2#readme"
+  "homepage": "https://github.com/sheetjs/bz2#readme",
+  "dependencies": {
+    "minimist": "^1.2.0"
+  }
 }