Fix windows not installing node_modules

plugin.py

@@ -8,9 +8,11 @@
 from LSP.plugin.core.settings import ClientConfig, LanguageConfig
 
 
+package_path = os.path.dirname(__file__)
+server_path = os.path.join(package_path, 'node_modules', 'vue-language-server', 'bin', 'vls')
+
+
 def plugin_loaded():
-    package_path = os.path.join(sublime.packages_path(), 'LSP-vue')
-    server_path = os.path.join(package_path, 'node_modules', 'vue-language-server', 'bin', 'vls')
     print('LSP-vue: Server {} installed.'.format('is' if os.path.isfile(server_path) else 'is not' ))
 
     # install the node_modules if not installed
@@ -22,7 +24,7 @@ def plugin_loaded():
 
         runCommand(
             onCommandDone,
-            ["npm", "install", "--verbose", "--prefix", package_path]
+            ["npm", "install", "--verbose", "--prefix", package_path, package_path]
         )
 
 
@@ -39,7 +41,10 @@ def runCommand(onExit, popenArgs):
     """
     def runInThread(onExit, popenArgs):
         try:
-            subprocess.check_call(popenArgs)
+            if sublime.platform() == 'windows':
+                subprocess.check_call(popenArgs, shell=True)
+            else:
+                subprocess.check_call(popenArgs)
             onExit()
         except subprocess.CalledProcessError as error:
             logAndShowMessage('LSP-vue: Error while installing the server.', error)
@@ -66,8 +71,6 @@ def name(self) -> str:
 
     @property
     def config(self) -> ClientConfig:
-        package_path = os.path.join(sublime.packages_path(), 'LSP-vue')
-        server_path = os.path.join(package_path, 'node_modules', 'vue-language-server', 'bin', 'vls')
         settings = sublime.load_settings("LSP-vue.sublime-settings")            
         return ClientConfig(
             name='lsp-vue',