Merge pull request #16 from bstoney/master

Windows install fixes

Author: castarco

src/Installer/Installer.php

@@ -102,7 +102,7 @@ protected function executeComposerCommand($installPath, $beVerbose = false)
         if ($beVerbose) {
             echo "\n";
             passthru(
-                'PATH=' . getenv('PATH') . ' ' .
+                'PATH=' . getenv('PATH') . ' && ' .
                 $this->composerCmd . ' --prefer-dist --no-interaction --working-dir="' .
                 $installPath .'" create-project litipk/jupyter-php=0.* pkgs',
 

src/System/UnixSystem.php

@@ -47,7 +47,7 @@ public function checkIfCommandExists($cmdName)
             "if command -v ".$cmdName." >/dev/null 2>&1; then echo \"true\"; else echo \"false\"; fi;"
         );
 
-        return filter_var($sysResponse, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE);
+        return filter_var($sysResponse, FILTER_VALIDATE_BOOLEAN);
     }
 
     /** @return string|null */

src/System/WindowsSystem.php

@@ -39,7 +39,13 @@ public function getCurrentUserHome()
      */
     public function checkIfCommandExists($cmdName)
     {
-        return true;
+        if (!function_exists('exec')) {
+            return false;
+        }
+
+        $sysResponse = exec("where $cmdName > nul 2>&1 && echo true");
+
+        return filter_var($sysResponse, FILTER_VALIDATE_BOOLEAN);
     }
 
     /** @return string */