config: add tag dispacther and window rule (#6211)

src/helpers/TagKeeper.cpp

@@ -0,0 +1,40 @@
+#include "TagKeeper.hpp"
+
+bool CTagKeeper::isTagged(const std::string& tag, bool strict) {
+    return m_tags.contains(tag) || (!strict && m_tags.contains(tag + "*"));
+}
+
+bool CTagKeeper::applyTag(const std::string& tag, bool dynamic) {
+
+    std::string tagReal = tag;
+
+    if (dynamic && !tag.ends_with("*"))
+        tagReal += "*";
+
+    bool changed = true;
+    bool setTag  = true;
+
+    if (tagReal.starts_with("-")) { // unset
+        tagReal = tagReal.substr(1);
+        changed = isTagged(tagReal, true);
+        setTag  = false;
+    } else if (tagReal.starts_with("+")) { // set
+        tagReal = tagReal.substr(1);
+        changed = !isTagged(tagReal, true);
+    } else // toggle if without prefix
+        setTag = !isTagged(tagReal, true);
+
+    if (!changed)
+        return false;
+
+    if (setTag)
+        m_tags.emplace(tagReal);
+    else
+        m_tags.erase(tagReal);
+
+    return true;
+}
+
+bool CTagKeeper::removeDynamicTags() {
+    return std::erase_if(m_tags, [](const auto& tag) { return tag.ends_with("*"); });
+}