Add source code.

include/Display.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <ctime>
+#include <set>
+#include <string>
+
+#include "Database.h"
+#include "Status.h"
+
+enum class AccountLevel { Busy, Free };
+
+struct DisplaySettings {
+    bool showTasks = true;     // auto-print the task table after each change
+    bool showAccounts = true;  // auto-print the account table after each change
+    std::set<StatusKind> hiddenTaskLevels;
+    std::set<AccountLevel> hiddenAccountLevels;
+};
+
+// Builds the computed views. The status shown is derived from the stored
+// status and the current time, never copied straight from the database.
+class Display {
+public:
+    explicit Display(const Database& db);
+
+    DisplaySettings& settings();
+    const DisplaySettings& settings() const;
+
+    std::string renderTasks(std::time_t now) const;
+    std::string renderAccounts(std::time_t now) const;
+
+private:
+    const Database& db_;
+    DisplaySettings settings_;
+};