Index: TODO
===================================================================
diff -u -ra6a6d9c14bfefba367b3147e05fbab4137f044ce -ra77e97b5d2b703b7c60a850b1f20f6c75e5029ac
--- TODO	(.../TODO)	(revision a6a6d9c14bfefba367b3147e05fbab4137f044ce)
+++ TODO	(.../TODO)	(revision a77e97b5d2b703b7c60a850b1f20f6c75e5029ac)
@@ -4930,6 +4930,7 @@
 - some c-code cleanup
 - tested with mongodb-c-driver 0.92.3
 - added mongo::collection::stats
+- added mongo::cursor::aggregate
 - extended regression test
 
 ========================================================================
Index: library/mongodb/mongoAPI.decls
===================================================================
diff -u -ra6a6d9c14bfefba367b3147e05fbab4137f044ce -ra77e97b5d2b703b7c60a850b1f20f6c75e5029ac
--- library/mongodb/mongoAPI.decls	(.../mongoAPI.decls)	(revision a6a6d9c14bfefba367b3147e05fbab4137f044ce)
+++ library/mongodb/mongoAPI.decls	(.../mongoAPI.decls)	(revision a77e97b5d2b703b7c60a850b1f20f6c75e5029ac)
@@ -85,6 +85,13 @@
 #
 # Cursor
 #
+cmd cursor::aggregate NsfMongoCursorAggregate {
+  {-argName "collection" -required 1 -type mongoc_collection_t}
+  {-argName "pipeline" -required 1 -type tclobj}
+  {-argName "options" -required 1 -type tclobj}
+  {-argName "-tailable" -required 0 -nrargs 0}
+  {-argName "-awaitdata" -required 0 -nrargs 0}
+}
 cmd cursor::find NsfMongoCursorFind {
   {-argName "collection" -required 1 -type mongoc_collection_t}
   {-argName "query" -required 1 -type tclobj}
Index: library/mongodb/mongoAPI.h
===================================================================
diff -u -ra6a6d9c14bfefba367b3147e05fbab4137f044ce -ra77e97b5d2b703b7c60a850b1f20f6c75e5029ac
--- library/mongodb/mongoAPI.h	(.../mongoAPI.h)	(revision a6a6d9c14bfefba367b3147e05fbab4137f044ce)
+++ library/mongodb/mongoAPI.h	(.../mongoAPI.h)	(revision a77e97b5d2b703b7c60a850b1f20f6c75e5029ac)
@@ -85,7 +85,7 @@
     
 
 /* just to define the symbol */
-static Nsf_methodDefinition method_definitions[27];
+static Nsf_methodDefinition method_definitions[28];
   
 static CONST char *method_command_namespace_names[] = {
   "::mongo"
@@ -101,6 +101,7 @@
 static int NsfMongoCollectionStatsStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
 static int NsfMongoCollectionUpdateStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
 static int NsfMongoConnectStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
+static int NsfMongoCursorAggregateStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
 static int NsfMongoCursorCloseStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
 static int NsfMongoCursorFindStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
 static int NsfMongoCursorNextStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv []);
@@ -128,6 +129,7 @@
 static int NsfMongoCollectionStats(Tcl_Interp *interp, mongoc_collection_t *collectionPtr, Tcl_Obj *withOptions);
 static int NsfMongoCollectionUpdate(Tcl_Interp *interp, mongoc_collection_t *collectionPtr, Tcl_Obj *cond, Tcl_Obj *values, int withUpsert, int withAll);
 static int NsfMongoConnect(Tcl_Interp *interp, CONST char *withUri);
+static int NsfMongoCursorAggregate(Tcl_Interp *interp, mongoc_collection_t *collectionPtr, Tcl_Obj *pipeline, Tcl_Obj *options, int withTailable, int withAwaitdata);
 static int NsfMongoCursorClose(Tcl_Interp *interp, mongoc_cursor_t *cursorPtr, Tcl_Obj *cursorObj);
 static int NsfMongoCursorFind(Tcl_Interp *interp, mongoc_collection_t *collectionPtr, Tcl_Obj *query, Tcl_Obj *withAtts, int withLimit, int withSkip, int withTailable, int withAwaitdata);
 static int NsfMongoCursorNext(Tcl_Interp *interp, mongoc_cursor_t *cursorPtr);
@@ -156,6 +158,7 @@
  NsfMongoCollectionStatsIdx,
  NsfMongoCollectionUpdateIdx,
  NsfMongoConnectIdx,
+ NsfMongoCursorAggregateIdx,
  NsfMongoCursorCloseIdx,
  NsfMongoCursorFindIdx,
  NsfMongoCursorNextIdx,
@@ -405,6 +408,29 @@
 }
 
 static int
+NsfMongoCursorAggregateStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
+  ParseContext pc;
+  (void)clientData;
+
+  if (likely(ArgumentParse(interp, objc, objv, NULL, objv[0], 
+                     method_definitions[NsfMongoCursorAggregateIdx].paramDefs, 
+                     method_definitions[NsfMongoCursorAggregateIdx].nrParameters, 0, NSF_ARGPARSE_BUILTIN,
+                     &pc) == TCL_OK)) {
+    mongoc_collection_t *collectionPtr = (mongoc_collection_t *)pc.clientData[0];
+    Tcl_Obj *pipeline = (Tcl_Obj *)pc.clientData[1];
+    Tcl_Obj *options = (Tcl_Obj *)pc.clientData[2];
+    int withTailable = (int )PTR2INT(pc.clientData[3]);
+    int withAwaitdata = (int )PTR2INT(pc.clientData[4]);
+
+    assert(pc.status == 0);
+    return NsfMongoCursorAggregate(interp, collectionPtr, pipeline, options, withTailable, withAwaitdata);
+
+  } else {
+    return TCL_ERROR;
+  }
+}
+
+static int
 NsfMongoCursorCloseStub(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
   ParseContext pc;
   (void)clientData;
@@ -709,7 +735,7 @@
   }
 }
 
-static Nsf_methodDefinition method_definitions[27] = {
+static Nsf_methodDefinition method_definitions[28] = {
 {"::mongo::collection::close", NsfCollectionCloseStub, 1, {
   {"collection", NSF_ARG_REQUIRED, 1, Nsf_ConvertTo_Pointer, NULL,NULL,"mongoc_collection_t",NULL,NULL,NULL,NULL,NULL}}
 },
@@ -764,6 +790,13 @@
 {"::mongo::connect", NsfMongoConnectStub, 1, {
   {"-uri", 0, 1, Nsf_ConvertTo_String, NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL}}
 },
+{"::mongo::cursor::aggregate", NsfMongoCursorAggregateStub, 5, {
+  {"collection", NSF_ARG_REQUIRED, 1, Nsf_ConvertTo_Pointer, NULL,NULL,"mongoc_collection_t",NULL,NULL,NULL,NULL,NULL},
+  {"pipeline", NSF_ARG_REQUIRED, 1, Nsf_ConvertTo_Tclobj, NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},
+  {"options", NSF_ARG_REQUIRED, 1, Nsf_ConvertTo_Tclobj, NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},
+  {"-tailable", 0, 0, Nsf_ConvertTo_String, NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},
+  {"-awaitdata", 0, 0, Nsf_ConvertTo_String, NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL}}
+},
 {"::mongo::cursor::close", NsfMongoCursorCloseStub, 1, {
   {"cursor", NSF_ARG_REQUIRED, 1, Nsf_ConvertTo_Pointer, NULL,NULL,"mongoc_cursor_t",NULL,NULL,NULL,NULL,NULL}}
 },
Index: library/mongodb/nsfmongo.c
===================================================================
diff -u -ra6a6d9c14bfefba367b3147e05fbab4137f044ce -ra77e97b5d2b703b7c60a850b1f20f6c75e5029ac
--- library/mongodb/nsfmongo.c	(.../nsfmongo.c)	(revision a6a6d9c14bfefba367b3147e05fbab4137f044ce)
+++ library/mongodb/nsfmongo.c	(.../nsfmongo.c)	(revision a77e97b5d2b703b7c60a850b1f20f6c75e5029ac)
@@ -1010,6 +1010,80 @@
  * Cursor interface
  ***********************************************************************/
 /*
+cmd cursor::aggregate NsfMongoCursorAggregate {
+  {-argName "collection" -required 1 -type mongoc_collection_t}
+  {-argName "pipeline" -required 1 -type tclobj}
+  {-argName "options" -required 1 -type tclobj}
+  {-argName "-tailable" -required 0 -nrargs 0}
+  {-argName "-awaitdata" -required 0 -nrargs 0}
+}
+*/
+static int
+NsfMongoCursorAggregate(Tcl_Interp *interp,
+                        mongoc_collection_t *collectionPtr,
+                        Tcl_Obj *pipelineObj,
+                        Tcl_Obj *optionsObj,
+                        int withTailable,
+                        int withAwaitdata) {
+  int objc1, objc2, result;
+  mongoc_query_flags_t queryFlags = 0;
+  Tcl_Obj **objv1, **objv2 = NULL;
+  mongoc_cursor_t *cursor;
+  bson_t pipeline, *pipelinePtr = &pipeline;
+  bson_t options,  *optionsPtr  = &options;
+  mongoc_read_prefs_t *readPrefsPtr = NULL; /* TODO: not used */
+
+  result = Tcl_ListObjGetElements(interp, pipelineObj, &objc1, &objv1);
+  if (result != TCL_OK || (objc1 % 3 != 0)) {
+    return NsfPrintError(interp, "%s: must contain a multiple of 3 elements", ObjStr(pipelineObj));
+  }
+  result = Tcl_ListObjGetElements(interp, optionsObj, &objc2, &objv2);
+  if (result != TCL_OK || (objc2 % 3 != 0)) {
+    return NsfPrintError(interp, "%s: must contain a multiple of 3 elements", ObjStr(optionsObj));
+  }
+
+  BsonAppendObjv(interp, pipelinePtr, objc1, objv1);
+  BsonAppendObjv(interp, optionsPtr,  objc2, objv2);
+
+  /*
+   *  The last field of mongo_find is options, semantics are described here
+   *  http://www.mongodb.org/display/DOCS/Mongo+Wire+Protocol#MongoWireProtocol-OPQUERY
+   */
+  if (withTailable) {
+    queryFlags |= MONGOC_QUERY_TAILABLE_CURSOR;
+  }
+  if (withAwaitdata) {
+    queryFlags |= MONGOC_QUERY_AWAIT_DATA;
+  }
+  /* TODO: query flags:
+   MONGOC_QUERY_SLAVE_OK          = 1 << 2,
+   MONGOC_QUERY_OPLOG_REPLAY      = 1 << 3,
+   MONGOC_QUERY_NO_CURSOR_TIMEOUT = 1 << 4,
+   MONGOC_QUERY_EXHAUST           = 1 << 6,
+   MONGOC_QUERY_PARTIAL           = 1 << 7,
+  */
+  cursor = mongoc_collection_aggregate(collectionPtr, queryFlags,
+                                       pipelinePtr, optionsPtr,
+                                       readPrefsPtr);
+  if (cursor) {
+    char buffer[80];
+    if (Nsf_PointerAdd(interp, buffer, "mongoc_cursor_t", cursor) == TCL_OK) {
+      Tcl_SetObjResult(interp, Tcl_NewStringObj(buffer, -1));
+    } else {
+      mongoc_cursor_destroy( cursor );
+      result = TCL_ERROR;
+    }
+  } else {
+    Tcl_ResetResult(interp);
+  }
+
+  bson_destroy( pipelinePtr );
+  bson_destroy( optionsPtr );
+
+  return result;
+}
+
+/*
 cmd cursor::find NsfMongoCursorFind {
   {-argName "collection" -required 1 -type mongoc_collection_t}
   {-argName "query" -required 1 -type tclobj}
@@ -1046,8 +1120,6 @@
     if (result != TCL_OK || (objc2 % 3 != 0)) {
       return NsfPrintError(interp, "%s: must contain a multiple of 3 elements", ObjStr(withAttsObj));
     }
-  } else {
-    objc2 = 0;
   }
 
   BsonAppendObjv(interp, queryPtr, objc1, objv1);