Add completion support to load-module

src/command_manager.cc

@@ -624,6 +624,13 @@ Completions CommandManager::complete_command_name(const Context& context, String
     return {0, query.length(), Kakoune::complete(query, query.length(), concatenated(commands, aliases))};
 }
 
+Completions CommandManager::complete_module_name(StringView query) const
+{
+    return {0, query.length(),
+            Kakoune::complete(query, query.length(), m_modules | filter([](auto&& item) { return not item.value.loaded; })
+                                                               | transform(&ModuleMap::Item::key))};
+}
+
 Completions CommandManager::complete(const Context& context,
                                      CompletionFlags flags,
                                      StringView command_line,

src/command_manager.hh

@@ -129,6 +129,8 @@ public:
 
     void load_module(StringView module_name, Context& context);
 
+    Completions complete_module_name(StringView query) const;
+
 private:
     void execute_single_command(CommandParameters params,
                                 Context& context,

src/commands.cc

@@ -2448,7 +2448,10 @@ const CommandDesc require_module_cmd = {
     ParameterDesc{ {}, ParameterDesc::Flags::None, 1, 1 },
     CommandFlags::None,
     CommandHelper{},
-    CommandCompleter{},
+    make_completer(
+         [](const Context&, CompletionFlags, const String& prefix, ByteCount cursor_pos) {
+            return CommandManager::instance().complete_module_name(prefix.substr(0, cursor_pos));
+        }),
     [](const ParametersParser& parser, Context& context, const ShellContext&)
     {
         CommandManager::instance().load_module(parser[0], context);