Completions: add basic addfilter completion

src/filter_registry.cc

@@ -29,4 +29,17 @@ void FilterRegistry::add_filter_to_window(Window& window,
     window.add_filter(it->second(window, parameters));
 }
 
+CandidateList FilterRegistry::complete_filter(const std::string& prefix,
+                                              size_t cursor_pos)
+{
+    std::string real_prefix = prefix.substr(0, cursor_pos);
+    CandidateList result;
+    for (auto& filter : m_factories)
+    {
+        if (filter.first.substr(0, real_prefix.length()) == real_prefix)
+            result.push_back(filter.first);
+    }
+    return result;
+}
+
 }

src/filter_registry.hh

@@ -6,6 +6,7 @@
 
 #include "filter.hh"
 #include "utils.hh"
+#include "completion.hh"
 
 namespace Kakoune
 {
@@ -27,6 +28,9 @@ public:
                               const std::string& factory_name,
                               const FilterParameters& parameters);
 
+    CandidateList complete_filter(const std::string& prefix,
+                                  size_t cursor_pos);
+
 private:
     std::unordered_map<std::string, FilterFactory> m_factories;
 };

src/main.cc

@@ -618,7 +618,10 @@ int main(int argc, char* argv[])
                                      PerArgumentCommandCompleter {
                                          std::bind(&BufferManager::complete_buffername, &buffer_manager, _1, _2)
                                       });
-    command_manager.register_command(std::vector<std::string>{ "af", "addfilter" }, add_filter);
+    command_manager.register_command(std::vector<std::string>{ "af", "addfilter" }, add_filter,
+                                     PerArgumentCommandCompleter {
+                                         std::bind(&FilterRegistry::complete_filter, &filter_registry, _1, _2)
+                                     });
     command_manager.register_command(std::vector<std::string>{ "rf", "rmfilter" }, rm_filter);
 
     register_filters();