handle REFILTERROR in execm

src/internfile/mh_execm.cpp

@@ -60,6 +60,7 @@ bool MimeHandlerExecMultiple::startCmd()
     m_cmd.putenv(m_forPreview ? "RECOLL_FILTER_FORPREVIEW=yes" :
 		"RECOLL_FILTER_FORPREVIEW=no");
     if (m_cmd.startExec(cmd, myparams, 1, 1) < 0) {
+        m_reason = string("RECFILTERROR HELPERNOTFOUND ") + cmd;
         missingHelper = true;
         return false;
     }
@@ -90,6 +91,15 @@ bool MimeHandlerExecMultiple::readDataElement(string& name, string &data)
         return true;
     }
 
+    // Filters will sometimes abort before entering the real protocol, ie if
+    // a module can't be loaded. Check the special filter error first word:
+    if (ibuf.find("RECFILTERROR ") == 0) {
+        m_reason = ibuf;
+        if (ibuf.find("HELPERNOTFOUND") != string::npos)
+            missingHelper = true;
+        return false;
+    }
+
     // We're expecting something like Name: len\n
     list<string> tokens;
     stringToTokens(ibuf, tokens);

src/internfile/mh_execm.h

@@ -68,14 +68,14 @@ class MimeHandlerExecMultiple : public MimeHandlerExec {
     {}
     // No resources to clean up, the ExecCmd destructor does it.
     virtual ~MimeHandlerExecMultiple() {}
-    virtual bool next_document();
-    virtual void clear() {
-	MimeHandlerExec::clear(); 
-    }
     virtual bool set_document_file(const string &file_path) {
         m_filefirst = true;
         return MimeHandlerExec::set_document_file(file_path);
     }
+    virtual bool next_document();
+
+    // skip_to and clear inherited from MimeHandlerExec
+
 private:
     bool startCmd();
     bool readDataElement(string& name, string& data);