Move hook executing logic into HookManager

The existing HookManager was able to run arbitrary hook functions,
but in practice was only used for user provided textual hooks.

That separation was causing some suboptimal performances, by moving
that logic directly in the hook manager we can improve hook filtering
performance which is a big part of startup time when opening lots
of files.

src/commands.cc

@@ -805,24 +805,8 @@ const CommandDesc add_hook_cmd = {
 
         Regex regex{parser[2], Regex::optimize | Regex::ECMAScript};
         const String& command = parser[3];
-
-        auto hook_func = [=](StringView param, Context& context) {
-            ScopedSetBool disable_history{context.history_disabled()};
-
-            MatchResults<const char*> res;
-            if (not regex_match(param.begin(), param.end(), res, regex))
-                return;
-
-            EnvVarMap env_vars{ {"hook_param", param.str()} };
-            for (size_t i = 0; i < res.size(); ++i)
-                env_vars.insert({format("hook_param_capture_{}", i),
-                                 {res[i].first, res[i].second}});
-
-            CommandManager::instance().execute(command, context,
-                                               { {}, std::move(env_vars) });
-        };
         auto group = parser.get_switch("group").value_or(StringView{});
-        get_scope(parser[0], context).hooks().add_hook(parser[1], group.str(), std::move(hook_func));
+        get_scope(parser[0], context).hooks().add_hook(parser[1], group.str(), std::move(regex), command);
     }
 };
 

src/hook_manager.cc

@@ -6,16 +6,17 @@
 #include "buffer_utils.hh"
 #include "display_buffer.hh"
 #include "face_registry.hh"
+#include "command_manager.hh"
 #include "regex.hh"
 #include "option.hh"
 
 namespace Kakoune
 {
 
-void HookManager::add_hook(StringView hook_name, String group, HookFunc func)
+void HookManager::add_hook(StringView hook_name, String group, Regex filter, String commands)
 {
     auto& hooks = m_hooks[hook_name];
-    hooks.emplace_back(new Hook{std::move(group), std::move(func)});
+    hooks.emplace_back(new Hook{std::move(group), std::move(filter), {}, std::move(commands)});
 }
 
 void HookManager::remove_hooks(StringView group)
@@ -84,8 +85,9 @@ void HookManager::run_hook(StringView hook_name,
     Vector<Hook*> hooks_to_run; // The m_hooks_trash vector ensure hooks wont die during this method
     for (auto& hook : hook_list->value)
     {
-        if (hook->group.empty() or disabled_hooks.empty() or
+        if ((hook->group.empty() or disabled_hooks.empty() or
-            not regex_match(hook->group.begin(), hook->group.end(), disabled_hooks))
+             not regex_match(hook->group.begin(), hook->group.end(), disabled_hooks))
+            and regex_match(param.begin(), param.end(), hook->captures, hook->filter))
             hooks_to_run.push_back(hook.get());
     }
 
@@ -96,7 +98,16 @@ void HookManager::run_hook(StringView hook_name,
         {
             if (debug_flags & DebugFlags::Hooks)
                 write_to_debug_buffer(format("hook {}({})/{}", hook_name, param, hook->group));
-            hook->func(param, context);
+
+            ScopedSetBool disable_history{context.history_disabled()};
+
+            EnvVarMap env_vars{ {"hook_param", param.str()} };
+            for (size_t i = 0; i < hook->captures.size(); ++i)
+                env_vars.insert({format("hook_param_capture_{}", i),
+                                 {hook->captures[i].first, hook->captures[i].second}});
+
+            CommandManager::instance().execute(hook->commands, context,
+                                               { {}, std::move(env_vars) });
         }
         catch (runtime_error& err)
         {

src/hook_manager.hh

@@ -4,19 +4,19 @@
 #include "hash_map.hh"
 #include "completion.hh"
 #include "safe_ptr.hh"
+#include "regex.hh"
 
 namespace Kakoune
 {
 
 class Context;
-using HookFunc = std::function<void (StringView, Context&)>;
 
 class HookManager : public SafeCountable
 {
 public:
     HookManager(HookManager& parent) : m_parent(&parent) {}
 
-    void add_hook(StringView hook_name, String group, HookFunc func);
+    void add_hook(StringView hook_name, String group, Regex filter, String commands);
     void remove_hooks(StringView group);
     CandidateList complete_hook_group(StringView prefix, ByteCount pos_in_token);
     void run_hook(StringView hook_name, StringView param,
@@ -31,7 +31,9 @@ private:
     struct Hook
     {
         String group;
-        HookFunc func;
+        Regex filter;
+        MatchResults<const char*> captures;
+        String commands;
     };
 
     SafePtr<HookManager> m_parent;