Support for multiple paths in OPENMM_PLUGIN_DIR

olla/include/openmm/Platform.h

@@ -35,6 +35,7 @@
 #include <map>
 #include <string>
 #include <vector>
+#include <sstream>
 #include "openmm/internal/windowsExport.h"
 
 namespace OpenMM {

olla/src/Platform.cpp

@@ -261,31 +261,42 @@ void Platform::loadPluginLibrary(const string& file) {
 vector<string> Platform::loadPluginsFromDirectory(const string& directory) {
     vector<string> files;
     char dirSeparator;
+    char pathSeparator;
+    stringstream sdirectory(directory);
 #ifdef WIN32
     dirSeparator = '\\';
+    pathSeparator = ';';
     WIN32_FIND_DATA fileInfo;
-    string filePattern(directory + dirSeparator + "*.dll");
+
+    for (string path; std::getline(sdirectory, path, pathSeparator);) {
+        string filePattern(path + dirSeparator + "*.dll");
         HANDLE findHandle = FindFirstFile(filePattern.c_str(), &fileInfo);
         if (findHandle != INVALID_HANDLE_VALUE) {
             do {
                 if (fileInfo.cFileName[0] != '.')
-                files.push_back(string(fileInfo.cFileName));
+                    files.push_back(path+dirSeparator+string(fileInfo.cFileName));
             } while (FindNextFile(findHandle, &fileInfo));
             FindClose(findHandle);
         }
+    }
     vector<HMODULE> plugins;
 #else
-    dirSeparator = '/';
     DIR* dir;
+    dirSeparator = '/';
+    pathSeparator = ':';
     struct dirent *entry;
-    dir = opendir(directory.c_str());
+
+    for (string path; std::getline(sdirectory, path, pathSeparator);) {
+        dir = opendir(path.c_str());
         if (dir != NULL) {
             while ((entry = readdir(dir)) != NULL) {
                 if (entry->d_name[0] != '.')
-                files.push_back(string(entry->d_name));
+                    files.push_back(path+dirSeparator+string(entry->d_name));
             }
             closedir(dir);
         }
+    }
+
     vector<void*> plugins;
 #endif
     vector<string> loadedLibraries;
@@ -294,7 +305,7 @@ vector<string> Platform::loadPluginsFromDirectory(const string& directory) {
 
     for (unsigned int i = 0; i < files.size(); ++i) {
         try {
-            plugins.push_back(loadOneLibrary(directory+dirSeparator+files[i]));
+            plugins.push_back(loadOneLibrary(files[i]));
             loadedLibraries.push_back(files[i]);
         } catch (OpenMMException& ex) {
 	    pluginLoadFailures.push_back(ex.what());