utils: add sanitize_str to encode '&' etc.

gtk requires some chars (<>&"') to be encoded for them to render
properly. `sanitize_str` sanitizes raw strings that have such chars and
returns a properly encoded string

include/util/sanitize_str.hpp

@@ -0,0 +1,6 @@
+#pragma once
+#include <string>
+
+namespace waybar::util {
+std::string sanitize_string(std::string str);
+}  // namespace waybar::util

meson.build

@@ -154,7 +154,8 @@ src_files = files(
     'src/client.cpp',
     'src/config.cpp',
     'src/group.cpp',
-    'src/util/ustring_clen.cpp'
+    'src/util/ustring_clen.cpp',
+    'src/util/sanitize_str.cpp'
 )
 
 if is_linux

src/modules/hyprland/language.cpp

@@ -4,6 +4,8 @@
 #include <xkbcommon/xkbcommon.h>
 #include <xkbcommon/xkbregistry.h>
 
+#include <util/sanitize_str.hpp>
+
 #include "modules/hyprland/backend.hpp"
 
 namespace waybar::modules::hyprland {
@@ -48,16 +50,6 @@ void Language::onEvent(const std::string& ev) {
   if (config_.isMember("keyboard-name") && keebName != config_["keyboard-name"].asString())
     return;  // ignore
 
-  auto replaceAll = [](std::string str, const std::string& from,
-                       const std::string& to) -> std::string {
-    size_t start_pos = 0;
-    while ((start_pos = str.find(from, start_pos)) != std::string::npos) {
-      str.replace(start_pos, from.length(), to);
-      start_pos += to.length();
-    }
-    return str;
-  };
-
   const auto BRIEFNAME = getShortFrom(layoutName);
 
   if (config_.isMember("format-" + BRIEFNAME)) {
@@ -67,7 +59,7 @@ void Language::onEvent(const std::string& ev) {
     layoutName = fmt::format(format_, layoutName);
   }
 
-  layoutName = replaceAll(layoutName, "&", "&amp;");
+  layoutName = waybar::util::sanitize_string(layoutName);
 
   if (layoutName == layoutName_) return;
 

src/modules/hyprland/window.cpp

@@ -2,6 +2,8 @@
 
 #include <spdlog/spdlog.h>
 
+#include <util/sanitize_str.hpp>
+
 #include "modules/hyprland/backend.hpp"
 
 namespace waybar::modules::hyprland {
@@ -39,17 +41,7 @@ void Window::onEvent(const std::string& ev) {
   std::lock_guard<std::mutex> lg(mutex_);
   auto windowName = ev.substr(ev.find_first_of(',') + 1).substr(0, 256);
 
-  auto replaceAll = [](std::string str, const std::string& from,
-                       const std::string& to) -> std::string {
-    size_t start_pos = 0;
-    while ((start_pos = str.find(from, start_pos)) != std::string::npos) {
-      str.replace(start_pos, from.length(), to);
-      start_pos += to.length();
-    }
-    return str;
-  };
-
-  windowName = replaceAll(windowName, "&", "&amp;");
+  windowName = waybar::util::sanitize_string(windowName);
 
   if (windowName == lastView) return;
 

src/modules/mpd/mpd.cpp

@@ -4,6 +4,9 @@
 #include <glibmm/ustring.h>
 #include <spdlog/spdlog.h>
 
+#include <util/sanitize_str.hpp>
+using namespace waybar::util;
+
 #include "modules/mpd/state.hpp"
 #if defined(MPD_NOINLINE)
 namespace waybar::modules {
@@ -135,12 +138,12 @@ void waybar::modules::MPD::setLabel() {
 
     stateIcon = getStateIcon();
 
-    artist = getTag(MPD_TAG_ARTIST);
-    album_artist = getTag(MPD_TAG_ALBUM_ARTIST);
-    album = getTag(MPD_TAG_ALBUM);
-    title = getTag(MPD_TAG_TITLE);
-    date = getTag(MPD_TAG_DATE);
-    filename = getFilename();
+    artist = sanitize_string(getTag(MPD_TAG_ARTIST));
+    album_artist = sanitize_string(getTag(MPD_TAG_ALBUM_ARTIST));
+    album = sanitize_string(getTag(MPD_TAG_ALBUM));
+    title = sanitize_string(getTag(MPD_TAG_TITLE));
+    date = sanitize_string(getTag(MPD_TAG_DATE));
+    filename = sanitize_string(getFilename());
     song_pos = mpd_status_get_song_pos(status_.get()) + 1;
     volume = mpd_status_get_volume(status_.get());
     if (volume < 0) {

src/util/sanitize_str.cpp

@@ -0,0 +1,24 @@
+#include <array>
+#include <string>
+#include <util/sanitize_str.hpp>
+#include <utility>
+
+namespace waybar::util {
+// replaces ``<>&"'`` with their encoded counterparts
+std::string sanitize_string(std::string str) {
+  // note: it's important that '&' is replaced first; therefor we *can't* use std::map
+  const std::pair<char, std::string> replacement_table[] = {
+      {'&', "&amp;"}, {'<', "&lt;"}, {'>', "&gt;"}, {'"', "&quot;"}, {'\'', "&apos;"}};
+  size_t startpoint;
+  for (size_t i = 0; i < (sizeof(replacement_table) / sizeof(replacement_table[0])); ++i) {
+    startpoint = 0;
+    std::pair pair = replacement_table[i];
+    while ((startpoint = str.find(pair.first, startpoint)) != std::string::npos) {
+      str.replace(startpoint, 1, pair.second);
+      startpoint += pair.second.length();
+    }
+  }
+
+  return str;
+}
+}  // namespace waybar::util