Add a temporary name filter for the main view.

By using 'F' in the main view you can enter a regex
that will be used to filter the view based on the torrent name.
To remove the filter set the input to empty.
This is adding a 'view.temp_filter' property and a 'match{}' function.
For example with Ctrl+X you could do:
command> view.temp_filter=main,"match={d.name=,.*linux.*iso}"

src/ui/download_list.cc

@@ -262,6 +262,10 @@ DownloadList::receive_view_input(Input type) {
     title = "command";
     break;
 
+  case INPUT_FILTER:
+    title = "filter";
+    break;
+
   default:
     throw torrent::internal_error("DownloadList::receive_view_input(...) Invalid input type.");
   }
@@ -325,6 +329,25 @@ DownloadList::receive_exit_input(Input type) {
                                 input->str());
       break;
 
+    case INPUT_FILTER:
+      if (input->str().empty()) {
+        control->core()->push_log_std("Clear temporary filter.");
+        current_view()->set_temp_filter(torrent::Object());
+        current_view()->filter();
+      } else {
+        std::string pattern = input->str();
+        if (pattern.back() != '$')
+          pattern = pattern + ".*";
+        if (pattern.front() != '^')
+          pattern = ".*" + pattern;
+        std::transform(pattern.begin(), pattern.end(), pattern.begin(), ::tolower);
+        std::string tempFilter = "match={d.name=," + pattern + "}";
+        control->core()->push_log_std("Temporary filter: " + pattern);
+        current_view()->set_temp_filter(tempFilter);
+        current_view()->filter();
+      }
+      break;
+
     default:
       throw torrent::internal_error("DownloadList::receive_exit_input(...) Invalid input type.");
     }
@@ -346,6 +369,7 @@ DownloadList::setup_keys() {
   m_bindings[KEY_ENTER]     = std::bind(&DownloadList::receive_view_input, this, INPUT_LOAD_MODIFIED);
   m_bindings['\x0F']        = std::bind(&DownloadList::receive_view_input, this, INPUT_CHANGE_DIRECTORY);
   m_bindings['X' - '@']     = std::bind(&DownloadList::receive_view_input, this, INPUT_COMMAND);
+  m_bindings['F']           = std::bind(&DownloadList::receive_view_input, this, INPUT_FILTER);
 
   m_uiArray[DISPLAY_LOG]->bindings()[KEY_LEFT] =
     m_uiArray[DISPLAY_LOG]->bindings()['B' - '@'] =

src/ui/download_list.h

@@ -86,7 +86,8 @@ public:
     INPUT_LOAD_DEFAULT,
     INPUT_LOAD_MODIFIED,
     INPUT_CHANGE_DIRECTORY,
-    INPUT_COMMAND
+    INPUT_COMMAND,
+    INPUT_FILTER
   } Input;
 
   DownloadList();