versions() added perl, python, gcc

CHANGELOG.md

@@ -100,6 +100,7 @@ Other changes
 
 | Version        | Date           | Comment  |
 | -------------- | -------------- | -------- |
+| 3.53.0         | 2018-12-29     | `versions()` added perl, python, gcc |
 | 3.52.7         | 2018-12-29     | `versions()` bug fix macOS detection |
 | 3.52.6         | 2018-12-28     | `versions()` bug fix macOS |
 | 3.52.5         | 2018-12-28     | preparing automated tests, travis-ci integration, added dev-dependencies |

lib/osinfo.js

@@ -299,11 +299,14 @@ function versions(callback) {
         php: '',
         docker: '',
         postfix: '',
-        postgresql: ''
+        postgresql: '',
+        perl: '',
+        python: '',
+        gcc: ''
       };
 
       let functionProcessed = (function () {
-        let totalFunctions = 16;
+        let totalFunctions = 19;
         return function () {
           if (--totalFunctions === 0) {
             if (callback) {
@@ -477,6 +480,31 @@ function versions(callback) {
             functionProcessed();
           });
         }
+        exec('perl -v', function (error, stdout) {
+          if (!error) {
+            const perl = stdout.toString().split('\n') || '';
+            while (perl.length > 0 && perl[0].trim() === '') {
+              perl.shift();
+            }
+            if (perl.length > 0) {
+              result.perl = perl[0].split('(').pop().split(')')[0].replace('v', '');
+            }
+          }
+          functionProcessed();
+        });
+        exec('python -V 2>&1', function (error, stdout) {
+          if (!error) {
+            const python = stdout.toString().split('\n')[0] || '';
+            result.python = python.toLowerCase().replace('python', '').trim();
+          }
+          functionProcessed();
+        });
+        exec('gcc -dumpversion', function (error, stdout) {
+          if (!error) {
+            result.gcc = stdout.toString().split('\n')[0].trim() || '';
+          }
+          functionProcessed();
+        });
       } catch (e) {
         if (callback) { callback(result); }
         resolve(result);