diff -r 82680ce258d6 -r 60c2588b4455 src/heatmap.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/heatmap.h	Fri Jan 31 22:11:04 2025 +0100
@@ -0,0 +1,58 @@
+/* Copyright 2025 Mike Becker. All rights reserved.
+*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef HEATMAP_H
+#define HEATMAP_H
+
+#include <map>
+#include <string>
+#include <chrono>
+
+namespace fm {
+
+class heatmap {
+    // to have nice sorted output later, we use ordered maps here
+    std::map<
+        std::string, // repository
+        std::map<
+            std::string, // author
+            std::map<
+                std::chrono::year_month_day, // date
+                unsigned int // commits
+    >>> m_heatmap;
+    std::string m_current_repo = "All Repositories";
+public:
+    void set_repo(const std::string& repo) {
+        m_current_repo.assign(repo);
+    }
+    void add(const std::string& log);
+
+    [[nodiscard]] const auto& data() const {
+        return m_heatmap;
+    }
+};
+
+}
+
+#endif //HEATMAP_H