added NotepadPPGateway methods

Author: kbilsted

Visual Studio Project Template C#/PluginInfrastructure/IScintillaGateway.cs

@@ -7,6 +7,10 @@ namespace Kbg.NppPluginNET
     public interface INotepadPPGateway
     {
         void FileNew();
+
+        string GetCurrentFilePath();
+        unsafe string GetFilePath(int bufferId);
+        void SetCurrentLanguage(LangType language);
     }
 
     /// <summary>

Visual Studio Project Template C#/PluginInfrastructure/ScintillaGateway.cs

@@ -13,6 +13,31 @@ public void FileNew()
         {
             Win32.SendMessage(PluginBase.nppData._nppHandle, NppMsg.NPPM_MENUCOMMAND, Unused, NppMenuCmd.IDM_FILE_NEW);
         }
+
+        /// <summary>
+        /// Gets the path of the current document.
+        /// </summary>
+        public string GetCurrentFilePath()
+        {
+            var path = new StringBuilder(2000);
+            Win32.SendMessage(PluginBase.nppData._nppHandle, NppMsg.NPPM_GETFULLCURRENTPATH, 0, path);
+            return path.ToString();
+        }
+
+        /// <summary>
+        /// Gets the path of the current document.
+        /// </summary>
+        public unsafe string GetFilePath(int bufferId)
+        {
+            var path = new StringBuilder(2000);
+            Win32.SendMessage(PluginBase.nppData._nppHandle, NppMsg.NPPM_GETFULLPATHFROMBUFFERID, bufferId, path);
+            return path.ToString();
+        }
+
+        public void SetCurrentLanguage(LangType language)
+        {
+            Win32.SendMessage(PluginBase.nppData._nppHandle, NppMsg.NPPM_SETCURRENTLANGTYPE, Unused, (int) language);
+        }
     }
 
     /// <summary>