Command done

src/Tui.cpp

@@ -0,0 +1,81 @@
+#include "Tui.h"
+
+#include <iostream>
+#include <optional>
+#include <ostream>
+#include <utility>
+
+#include "Command.h"
+
+Tui::Tui(Page page) : m_page(std::move(page)) {
+}
+
+
+std::optional<int> get_page_number(const std::string_view line) {
+    const size_t space = line.find_first_of(' ');
+    if (space == std::string::npos)
+        return std::nullopt;
+
+    int number = 0;
+    const size_t size = line.size();
+    for (size_t i = space; i < size; i++) {
+        const char c = line[i];
+        if (!std::isdigit(c))
+            return std::nullopt;
+
+        number = number * 10 + (c - '0');
+    }
+
+    return number;
+}
+
+void printHelp() {
+    std::cout
+            << "Available Commands:\n"
+            << "  r, refresh                : Refresh the current view.\n"
+            << "  n, >, next                : Move to the next item.\n"
+            << "  p, <, previous            : Move to the previous item.\n"
+            << "  x, exit, q, quit          : Exit the application.\n"
+            << "  seek <number>, s <number> : Seek to the specified number.\n"
+            << "  help, h, ?                : Display this help message."
+            << std::endl;
+}
+
+void Tui::run() {
+    std::cout << m_page.str_pretty() << std::endl;
+    for (;;) {
+        std::cout << "Enter a command: ";
+        std::flush(std::cout);
+        const Command::Command command = Command::readCommand();
+
+        bool should_exit = false;
+        auto visitor = [this, &should_exit]<typename T0>(T0 &&arg) {
+            using T = std::decay_t<T0>;
+
+            if constexpr (std::is_same_v<T, Command::None>) {
+                std::cout << "Invalid command!" << std::endl;
+            } else if constexpr (std::is_same_v<T, Command::Next>) {
+                m_page += 1;
+                std::cout << m_page.str_pretty() << std::endl;
+            } else if constexpr (std::is_same_v<T, Command::Previous>) {
+                m_page -= 1;
+                std::cout << m_page.str_pretty() << std::endl;
+            } else if constexpr (std::is_same_v<T, Command::Refresh>) {
+                m_page.refresh();
+                std::cout << m_page.str_pretty() << std::endl;
+            } else if constexpr (std::is_same_v<T, Command::Exit>) {
+                should_exit = true;
+            } else if constexpr (std::is_same_v<T, Command::Help>) {
+                printHelp();
+            } else if constexpr (std::is_same_v<T, Command::Seek>) {
+                const Command::Seek &seek = arg;
+                const int number = seek.number;
+                m_page = Page(number);
+                std::cout << m_page.str_pretty() << std::endl;
+            }
+        };
+        std::visit(visitor, command);
+        if (should_exit)
+            return;
+    }
+}