refactor: separate regex rule matching and caching in separate class

include/modules/hyprland/workspaces.hpp

@@ -16,8 +16,10 @@
 #include "bar.hpp"
 #include "modules/hyprland/backend.hpp"
 #include "util/enum.hpp"
+#include "util/regex_collection.hpp"
 
 using WindowAddress = std::string;
+
 namespace waybar::modules::hyprland {
 
 class Workspaces;
@@ -47,7 +49,7 @@ class Workspace {
   void set_windows(uint value) { windows_ = value; };
   void set_name(std::string value) { name_ = value; };
   bool contains_window(WindowAddress addr) { return window_map_.contains(addr); }
-  void insert_window(WindowAddress addr, std::string window_repr);
+  void insert_window(WindowAddress addr, std::string window_class, std::string window_title);
   std::string remove_window(WindowAddress addr);
   void initialize_window_map(const Json::Value& clients_data);
 
@@ -92,7 +94,7 @@ class Workspaces : public AModule, public EventHandler {
 
   auto get_bar_output() const -> std::string { return bar_.output->name; }
 
-  std::string get_rewrite(std::string window_class);
+  std::string get_rewrite(std::string window_class, std::string window_title);
   std::string& get_window_separator() { return format_window_separator_; }
 
  private:
@@ -129,11 +131,12 @@ class Workspaces : public AModule, public EventHandler {
   bool persistent_created_ = false;
 
   std::string format_;
+
   std::map<std::string, std::string> icons_map_;
-  Json::Value window_rewrite_rules_;
-  std::map<std::string, std::string> regex_cache_;
+  util::RegexCollection window_rewrite_rules_;
+  bool any_window_rewrite_rule_uses_title_ = false;
   std::string format_window_separator_;
-  std::string window_rewrite_default_;
+
   bool with_icon_;
   uint64_t monitor_id_;
   std::string active_workspace_name_;

include/util/regex_collection.hpp

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <json/json.h>
+
+#include <functional>
+#include <regex>
+#include <string>
+
+namespace waybar::util {
+
+struct Rule {
+  std::regex rule;
+  std::string repr;
+  int priority;
+};
+
+int default_priority_function(std::string& key);
+
+class RegexCollection {
+ private:
+  std::vector<Rule> rules;
+  std::map<std::string, std::string> regex_cache;
+  std::string default_repr;
+
+  std::string& find_match(std::string& value, bool& matched_any);
+
+ public:
+  RegexCollection() = default;
+  RegexCollection(const Json::Value& map, std::string default_repr = "",
+                  std::function<int(std::string&)> priority_function = default_priority_function);
+  ~RegexCollection() = default;
+
+  std::string& get(std::string& value, bool& matched_any);
+  std::string& get(std::string& value);
+};
+
+}  // namespace waybar::util

meson.build

@@ -177,7 +177,8 @@ src_files = files(
     'src/util/ustring_clen.cpp',
     'src/util/sanitize_str.cpp',
     'src/util/rewrite_string.cpp',
-    'src/util/gtk_icon.cpp'
+    'src/util/gtk_icon.cpp',
+    'src/util/regex_collection.cpp'
 )
 
 inc_dirs = ['include']

src/modules/hyprland/workspaces.cpp

@@ -1,19 +1,34 @@
 #include "modules/hyprland/workspaces.hpp"
 
-#include <fmt/ostream.h>
 #include <json/value.h>
 #include <spdlog/spdlog.h>
 
 #include <algorithm>
 #include <charconv>
 #include <memory>
-#include <optional>
 #include <string>
 
-#include "util/rewrite_string.hpp"
+#include "util/regex_collection.hpp"
 
 namespace waybar::modules::hyprland {
 
+int window_rewrite_priority_function(std::string &window_rule) {
+  // Rules that match against title are prioritized
+  // Rules that don't specify if they're matching against either title or class are deprioritized
+  bool has_title = window_rule.find("title") != std::string::npos;
+  bool has_class = window_rule.find("class") != std::string::npos;
+
+  if (has_title && has_class) {
+    return 3;
+  } else if (has_title) {
+    return 2;
+  } else if (has_class) {
+    return 1;
+  } else {
+    return 0;
+  }
+}
+
 Workspaces::Workspaces(const std::string &id, const Bar &bar, const Json::Value &config)
     : AModule(config, "workspaces", id, false, false),
       bar_(bar),
@@ -77,11 +92,14 @@ auto Workspaces::parse_config(const Json::Value &config) -> void {
   format_window_separator_ =
       format_window_separator.isString() ? format_window_separator.asString() : " ";
 
-  window_rewrite_rules_ = config["window-rewrite"];
+  Json::Value window_rewrite = config["window-rewrite"];
 
-  Json::Value window_rewrite_default = config["window-rewrite-default"];
-  window_rewrite_default_ =
-      window_rewrite_default.isString() ? window_rewrite_default.asString() : "?";
+  Json::Value window_rewrite_default_config = config["window-rewrite-default"];
+  std::string window_rewrite_default =
+      window_rewrite_default_config.isString() ? window_rewrite_default_config.asString() : "?";
+
+  window_rewrite_rules_ = util::RegexCollection(window_rewrite, window_rewrite_default,
+                                                window_rewrite_priority_function);
 }
 
 auto Workspaces::register_ipc() -> void {
@@ -323,13 +341,14 @@ void Workspace::initialize_window_map(const Json::Value &clients_data) {
       // {ADDR}
       WindowAddress client_address = client["address"].asString();
       client_address = client_address.substr(2, client_address.length() - 2);
-      insert_window(client_address, client["class"].asString());
+      insert_window(client_address, client["class"].asString(), client["title"].asString());
     }
   }
 }
 
-void Workspace::insert_window(WindowAddress addr, std::string window_class) {
-  auto window_repr = workspace_manager_.get_rewrite(window_class);
+void Workspace::insert_window(WindowAddress addr, std::string window_class,
+                              std::string window_title) {
+  auto window_repr = workspace_manager_.get_rewrite(window_class, window_title);
   if (!window_repr.empty()) {
     window_map_.emplace(addr, window_repr);
   }
@@ -355,7 +374,7 @@ bool Workspace::on_window_opened(WindowAddress &addr, std::string &workspace_nam
 bool Workspace::on_window_opened(WindowAddress &addr, std::string &workspace_name,
                                  std::string &window_class, std::string &window_title) {
   if (workspace_name == name()) {
-    insert_window(addr, window_class);
+    insert_window(addr, window_class, window_title);
     return true;
   } else {
     return false;
@@ -766,23 +785,9 @@ void Workspaces::set_urgent_workspace(std::string windowaddress) {
   }
 }
 
-std::string Workspaces::get_rewrite(std::string window_class) {
-  if (regex_cache_.contains(window_class)) {
-    return regex_cache_[window_class];
-  }
-
-  bool matched_any;
-
-  std::string window_class_rewrite =
-      waybar::util::rewriteStringOnce(window_class, window_rewrite_rules_, matched_any);
-
-  if (!matched_any) {
-    window_class_rewrite = window_rewrite_default_;
-  }
-
-  regex_cache_.emplace(window_class, window_class_rewrite);
-
-  return window_class_rewrite;
+std::string Workspaces::get_rewrite(std::string window_class, std::string window_title) {
+  std::string window_repr_key = fmt::format("class<{}> title<{}>", window_class, window_title);
+  return window_rewrite_rules_.get(window_repr_key);
 }
 
 }  // namespace waybar::modules::hyprland

src/util/regex_collection.cpp

@@ -0,0 +1,69 @@
+#include "util/regex_collection.hpp"
+
+#include <json/value.h>
+#include <spdlog/spdlog.h>
+
+namespace waybar::util {
+
+int default_priority_function(std::string& key) { return 0; }
+
+RegexCollection::RegexCollection(const Json::Value& map, std::string default_repr,
+                                 std::function<int(std::string&)> priority_function)
+    : default_repr(default_repr) {
+  if (!map.isObject()) {
+    spdlog::warn("Mapping is not an object");
+    return;
+  }
+
+  for (auto it = map.begin(); it != map.end(); ++it) {
+    if (it.key().isString() && it->isString()) {
+      std::string key = it.key().asString();
+      int priority = priority_function(key);
+      try {
+        const std::regex rule{key, std::regex_constants::icase};
+        rules.emplace_back(rule, it->asString(), priority);
+      } catch (const std::regex_error& e) {
+        spdlog::error("Invalid rule '{}': {}", key, e.what());
+      }
+    }
+  }
+
+  std::sort(rules.begin(), rules.end(), [](Rule& a, Rule& b) { return a.priority > b.priority; });
+}
+
+std::string& RegexCollection::find_match(std::string& value, bool& matched_any) {
+  for (auto& rule : rules) {
+    if (std::regex_search(value, rule.rule)) {
+      matched_any = true;
+      return rule.repr;
+    }
+  }
+
+  return value;
+}
+
+std::string& RegexCollection::get(std::string& value, bool& matched_any) {
+  if (regex_cache.contains(value)) {
+    return regex_cache[value];
+  }
+
+  // std::string repr =
+  // waybar::util::find_match(value, window_rewrite_rules_, matched_any);
+
+  std::string repr = find_match(value, matched_any);
+
+  if (!matched_any) {
+    repr = default_repr;
+  }
+
+  regex_cache.emplace(value, repr);
+
+  return regex_cache[value];  // Necessary in order to return a reference to the heap
+}
+
+std::string& RegexCollection::get(std::string& value) {
+  bool matched_any = false;
+  return get(value, matched_any);
+}
+
+}  // namespace waybar::util

src/util/rewrite_string.cpp

@@ -1,6 +1,5 @@
 #include "util/rewrite_string.hpp"
 
-#include <fmt/core.h>
 #include <spdlog/spdlog.h>
 
 #include <regex>
@@ -30,31 +29,4 @@ std::string rewriteString(const std::string& value, const Json::Value& rules) {
 
   return res;
 }
-
-std::string rewriteStringOnce(const std::string& value, const Json::Value& rules,
-                              bool& matched_any) {
-  if (!rules.isObject()) {
-    return value;
-  }
-
-  matched_any = false;
-
-  std::string res = value;
-
-  for (auto it = rules.begin(); it != rules.end(); ++it) {
-    if (it.key().isString() && it->isString()) {
-      try {
-        const std::regex rule{it.key().asString(), std::regex_constants::icase};
-        if (std::regex_match(value, rule)) {
-          matched_any = true;
-          return std::regex_replace(res, rule, it->asString());
-        }
-      } catch (const std::regex_error& e) {
-        spdlog::error("Invalid rule {}: {}", it.key().asString(), e.what());
-      }
-    }
-  }
-
-  return value;
-}
 }  // namespace waybar::util