Add parsing file (ProjectVersion.txt) via CLI flag support. (#12)

* Added parseVersionFromString library method.

Added tests.

* Read in file flag and replace input value with result.

* Catch error and display message.

* Add flag to help output.

* Removed flag default.

* Added exit code.

Author: neogeek

bin/index.js

@@ -1,6 +1,7 @@
 #!/usr/bin/env node
 
 const os = require('os');
+const {readFileSync} = require('fs');
 
 const chalk = require('chalk');
 const meow = require('meow');
@@ -10,18 +11,24 @@ const updateNotifier = require('update-notifier');
 const pkg = require('../package.json');
 
 const getUnityUrls = require('../lib/get-unity-urls');
+const {parseVersionFromString} = require('../lib/parsers');
 
 const cli = meow(
     `
       Usage
         $ get-unity <version> [options]
 
       Options
+      ${chalk.yellow('--file, -f')}     Search file for Unity version number.
       ${chalk.yellow('--help, -h')}     Display this help message.
       ${chalk.yellow('--version, -v')}  Display the current installed version.
   `,
     {
         'flags': {
+            'file': {
+                'alias': 'f',
+                'type': 'string'
+            },
             'help': {
                 'alias': 'h',
                 'default': false,
@@ -43,5 +50,24 @@ const osKeyMap = {
 
 updateNotifier({pkg}).notify();
 
+if (cli.flags.file) {
+
+    try {
+
+        cli.input[0] = parseVersionFromString(readFileSync(
+            cli.flags.file,
+            'utf8'
+        ));
+
+    } catch ({message}) {
+
+        process.stderr.write(`${chalk.red('Error:')} ${message}`);
+
+        process.exit(1);
+
+    }
+
+}
+
 getUnityUrls(cli.input[0]).then(urls =>
     process.stdout.write(`${urls[osKeyMap[os.type()]]}`));

lib/parsers.js

@@ -0,0 +1,19 @@
+const versionRegex = /[0-9]+\.[0-9]+\.[0-9]+[a-z][0-9]+/u;
+
+const parseVersionFromString = (contents = '') => {
+
+    const matches = contents.match(versionRegex);
+
+    if (matches && matches.length > 0) {
+
+        return matches[0];
+
+    }
+
+    throw new Error('Failed to parse version from string.');
+
+};
+
+module.exports = {
+    parseVersionFromString
+};

package.json

@@ -18,7 +18,11 @@
   "devDependencies": {
     "@neogeek/eslint-config-standards": "github:neogeek/eslint-config-standards",
     "babel-eslint": "10.0.3",
-    "eslint": "6.6.0"
+    "eslint": "6.6.0",
+    "jest": "24.9.0"
+  },
+  "scripts": {
+    "test": "jest"
   },
   "keywords": [
     "unity"

tests/.eslintrc

@@ -0,0 +1,3 @@
+{
+  "extends": ["@neogeek/eslint-config-standards/.eslintrc-tests"]
+}

tests/parsers.test.js

@@ -0,0 +1,22 @@
+const {parseVersionFromString} = require('../lib/parsers');
+
+test(
+    'Parse version from ProjectVersion.txt',
+    () => {
+
+        const projectVersionContents = `m_EditorVersion: 2019.2.9f1
+m_EditorVersionWithRevision: 2019.2.9f1 (ebce4d76e6e8)`;
+
+        expect(parseVersionFromString(projectVersionContents)).toBe('2019.2.9f1');
+
+    }
+);
+
+test(
+    'Fail to parse version from empty string',
+    () => {
+
+        expect(() => parseVersionFromString('')).toThrow(Error);
+
+    }
+);