Completions: add filterid completion for rmfilter

src/main.cc

@@ -622,7 +622,11 @@ int main(int argc, char* argv[])
                                      PerArgumentCommandCompleter {
                                          std::bind(&FilterRegistry::complete_filter, &filter_registry, _1, _2)
                                      });
-    command_manager.register_command(std::vector<std::string>{ "rf", "rmfilter" }, rm_filter);
+    command_manager.register_command(std::vector<std::string>{ "rf", "rmfilter" }, rm_filter,
+                                     PerArgumentCommandCompleter {
+                                         [&](const std::string& prefix, size_t cursor_pos)
+                                         { return current_window->complete_filterid(prefix, cursor_pos); }
+                                     });
 
     register_filters();
 

src/window.cc

@@ -331,6 +331,20 @@ void Window::remove_filter(const std::string& id)
     }
 }
 
+CandidateList Window::complete_filterid(const std::string& prefix,
+                                        size_t cursor_pos)
+{
+    std::string real_prefix = prefix.substr(0, cursor_pos);
+    CandidateList result;
+    for (auto& filter : m_filters)
+    {
+        if (filter.first.substr(0, real_prefix.length()) == real_prefix)
+            result.push_back(filter.first);
+    }
+    return result;
+}
+
+
 IncrementalInserter::IncrementalInserter(Window& window, Mode mode)
     : m_window(window)
 {

src/window.hh

@@ -6,6 +6,7 @@
 #include "buffer.hh"
 #include "dynamic_buffer_iterator.hh"
 #include "display_buffer.hh"
+#include "completion.hh"
 #include "filter.hh"
 
 namespace Kakoune
@@ -80,6 +81,9 @@ public:
     void add_filter(FilterAndId&& filter);
     void remove_filter(const std::string& id);
 
+    CandidateList complete_filterid(const std::string& prefix,
+                                    size_t cursor_pos = std::string::npos);
+
 private:
     friend class Buffer;