Refactor app modules and add clang-format

src/app_help.cpp

@@ -0,0 +1,174 @@
+#include "app.h"
+
+#include <algorithm>
+#include <vector>
+
+#include <curses.h>
+
+#include "util.h"
+
+namespace telegram_tui {
+
+namespace {
+
+const std::vector<std::string> kShinoaBanner = {
+        "  ____  _     _                   ",      " / ___|| |__ (_)_ __   ___   __ _ ",
+        " \\___ \\| '_ \\| | '_ \\ / _ \\ / _` |", "  ___) | | | | | | | | (_) | (_| |",
+        " |____/|_| |_|_|_| |_|\\___/ \\__,_|",
+};
+
+} // namespace
+
+void App::handle_help_menu_key(int ch) {
+	switch (ch) {
+	case 27:
+	case 'h':
+	case '?':
+	case KEY_F(1):
+		help_menu_open_ = false;
+		status_line_ = "Closed help.";
+		return;
+	case '1':
+		help_menu_page_ = 0;
+		status_line_ = "Help.";
+		return;
+	case '2':
+		help_menu_page_ = 1;
+		status_line_ = "Settings.";
+		return;
+	case '3':
+		help_menu_page_ = 2;
+		status_line_ = "About.";
+		return;
+	case KEY_LEFT:
+		help_menu_page_ = (help_menu_page_ + 2) % 3;
+		return;
+	case KEY_RIGHT:
+		help_menu_page_ = (help_menu_page_ + 1) % 3;
+		return;
+	case 't':
+		if (help_menu_page_ != 1) {
+			return;
+		}
+		auto_reload_chat_history_ = !auto_reload_chat_history_;
+		persist_config();
+		status_line_ = auto_reload_chat_history_ ? "Auto-reload history enabled."
+		                                         : "Auto-reload history disabled.";
+		return;
+	default:
+		return;
+	}
+}
+
+void App::draw_help_menu(int height, int width) {
+	const int menu_width = std::min(width - 4, 92);
+	const int menu_height = std::min(height - 4, 24);
+	const int top = std::max(1, (height - menu_height) / 2);
+	const int left = std::max(1, (width - menu_width) / 2);
+
+	WINDOW *window = newwin(menu_height, menu_width, top, left);
+	if (window == nullptr) {
+		return;
+	}
+
+	box(window, 0, 0);
+	const char *title =
+	        help_menu_page_ == 0 ? " Help " : (help_menu_page_ == 1 ? " Settings " : " About ");
+	mvwprintw(window, 0, 2, "%s", title);
+	const std::string page_tabs =
+	        help_menu_page_ == 0 ? "[1] Help  2 Settings  3 About"
+	                             : (help_menu_page_ == 1 ? "1 Help  [2] Settings  3 About"
+	                                                     : "1 Help  2 Settings  [3] About");
+	mvwaddnstr(window, 1, 2, page_tabs.c_str(), menu_width - 4);
+	mvwhline(window, 2, 1, ACS_HLINE, menu_width - 2);
+	const auto help_item = [](const std::string &key, const std::string &description) {
+		std::string line = "  " + key;
+		const int key_width = std::max(16, utf8_display_width(key));
+		const int padding = std::max(2, key_width - utf8_display_width(key) + 2);
+		line.append(static_cast<std::size_t>(padding), ' ');
+		line += description;
+		return line;
+	};
+
+	std::vector<std::string> lines;
+	if (help_menu_page_ == 0) {
+		lines = {
+		        "Navigation",
+		        help_item("? / h", "Open or close help"),
+		        help_item("Tab", "Switch focus"),
+		        help_item("Enter", "Open selected chat"),
+		        help_item("Up / Down", "Move chats or attachment selection"),
+		        help_item("PgUp / PgDn", "Scroll messages"),
+		        "",
+		        "Compose",
+		        help_item("i", "Compose a message"),
+		        help_item("a", "Prepare reply to latest"),
+		        help_item(">r <msg> [text]", "Prepare a reply"),
+		        help_item(">paste [caption]", "Send clipboard image"),
+		        "",
+		        "Message Actions",
+		        help_item(">f <msg...>", "Forward messages"),
+		        help_item(">e <msg> <text>", "Edit a message"),
+		        help_item(">d <msg...>", "Delete your messages"),
+		        help_item("m / o", "Attachments menu / open selected"),
+		};
+	} else if (help_menu_page_ == 1) {
+		lines = {
+		        "Settings",
+		        std::string("  [") + (auto_reload_chat_history_ ? 'x' : ' ') +
+		                "] Auto-reload open chat history [t]",
+		        "",
+		        "Behavior",
+		        "  On:  Enter in the message pane reloads history.",
+		        "  Off: Press r to reload the current chat manually.",
+		        "",
+		        "Menu",
+		        help_item("1 / 2 / 3", "Switch help pages"),
+		        help_item("Left / Right", "Cycle pages"),
+		        help_item("Esc", "Close the help overlay"),
+		};
+	} else {
+		lines = {
+		        "",
+		        "",
+		};
+	}
+
+	const int content_top = 3;
+	const int content_height = menu_height - 6;
+	if (help_menu_page_ == 2) {
+		int row = content_top;
+		for (const auto &line : kShinoaBanner) {
+			if (row >= content_top + content_height) {
+				break;
+			}
+			const int x = std::max(2, (menu_width - static_cast<int>(line.size())) / 2);
+			mvwaddnstr(window, row++, x, line.c_str(), menu_width - x - 1);
+		}
+		const std::vector<std::string> about_lines = {
+		        "",
+		        "Telegram TUI with message refs, reply prep, attachment navigation,",
+		        "and keyboard-first chat workflows.",
+		};
+		for (const auto &line : about_lines) {
+			if (row >= content_top + content_height) {
+				break;
+			}
+			const int x = std::max(2, (menu_width - static_cast<int>(line.size())) / 2);
+			mvwaddnstr(window, row++, x, line.c_str(), menu_width - x - 1);
+		}
+	} else {
+		for (std::size_t i = 0; i < lines.size() && static_cast<int>(i) < content_height;
+		     ++i) {
+			mvwaddnstr(window, static_cast<int>(i) + content_top, 2, lines[i].c_str(),
+			           menu_width - 4);
+		}
+	}
+
+	mvwhline(window, menu_height - 3, 1, ACS_HLINE, menu_width - 2);
+	mvwaddnstr(window, menu_height - 2, 2, "Esc close", menu_width - 4);
+	wrefresh(window);
+	delwin(window);
+}
+
+} // namespace telegram_tui