Added everything

StatusBarManager.cpp

@@ -0,0 +1,187 @@
+#include "StatusBarManager.h"
+
+#include <iostream>
+#include <string>
+
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+using std::cout;
+using std::flush;
+using std::string;
+
+StatusBarManager::StatusBarManager()
+: m_is_started(false)
+{}
+
+StatusBarManager::~StatusBarManager()
+{
+	if(m_is_started)
+	{
+		stop();
+	}
+}
+
+StatusBarManager::TermSize StatusBarManager::get_terminal_size()
+{
+	struct winsize win;
+	StatusBarManager::TermSize result = { 0, 0 };
+
+	if(ioctl(STDOUT_FILENO, TIOCGWINSZ, (char *)&win) != 0)
+	{
+		return result;
+	}
+
+	result.rows = win.ws_row;
+	result.columns = win.ws_col;
+
+	return result;
+}
+
+void StatusBarManager::setup_terminal_scroll_area(int nr_rows)
+{
+	int status_rows = m_progress_messages.size();
+	if (nr_rows <= 1)
+	{
+		return;
+	}
+
+	// scroll down a bit to avoid visual glitch when the screen
+	// area shrinks by needed ammount of rows
+	for (int i = 0; i < status_rows; ++i)
+	{
+		cout << std::endl;
+	}
+
+	// save cursor
+	cout << "\e7";
+
+	// set scroll region (this will place the cursor in the top left)
+	cout << "\e[0;" << std::to_string(nr_rows - status_rows) << "r";
+
+	// restore cursor but ensure its inside the scrolling area
+	cout << "\e8";
+	cout << "\e[" << status_rows << "A";
+
+	// ensure its flushed
+	flush(cout);
+
+// Leftovers from apt
+#if 0
+	// setup tty size to ensure xterm/linux console are working properly too
+	// see bug #731738
+	struct winsize win;
+	if (ioctl(child_pty, TIOCGWINSZ, (char *)&win) != -1)
+	{
+		win.ws_row = nr_rows - 1;
+		ioctl(child_pty, TIOCSWINSZ, (char *)&win);
+	}
+#endif
+}
+
+void StatusBarManager::start()
+{
+	if (!m_is_started)
+	{
+		int const nr_terminal_rows = get_terminal_size().rows;
+		setup_terminal_scroll_area(nr_terminal_rows);
+		m_is_started = true;
+	}
+}
+
+void StatusBarManager::stop()
+{
+	if (m_is_started)
+	{
+		int const nr_terminal_rows = get_terminal_size().rows;
+		if (nr_terminal_rows > 0)
+		{
+			setup_terminal_scroll_area(nr_terminal_rows + m_progress_messages.size());
+
+			// override the progress line (sledgehammer)
+			static const char* clear_screen_below_cursor = "\e[J";
+			cout << clear_screen_below_cursor;
+			flush(cout);
+		}
+
+		m_is_started = false;
+	}
+}
+
+bool StatusBarManager::draw_status_line()
+{
+	if (!m_is_started)
+	{
+		return false;
+	}
+
+	StatusBarManager::TermSize const size = get_terminal_size();
+	if (size.rows < 1 || size.columns < 1)
+	{
+		return false;
+	}
+
+	static string save_cursor = "\e7";
+	static string restore_cursor = "\e8";
+
+	// green
+	static string set_bg_color = "\e[42m";
+	// black
+	static string set_fg_color = "\e[30m";
+
+	static string restore_bg =  "\e[49m";
+	static string restore_fg = "\e[39m";
+
+	cout << save_cursor;
+
+	int status_rows = m_progress_messages.size();
+	for (int i = 0; i < status_rows; ++i)
+	{
+		// move cursor position to current row
+		cout << "\e[" << std::to_string(size.rows + 1 - status_rows + i) << ";0f"
+			<< set_bg_color
+			<< set_fg_color;
+		if (nullptr != m_progress_messages[i])
+		{
+			cout << *(m_progress_messages[i]);
+		}
+		flush(cout);
+	}
+
+	cout << restore_bg
+		<< restore_fg;
+	flush(cout);
+
+	// leftover progress-bar from apt
+#if 0
+	// draw text progress bar
+	int padding = 4;
+	auto const progressbar_size = size.columns - padding - String::DisplayLength(progress_str);
+	auto const current_percent = percentage / 100.0f;
+	cout << " "
+					<< GetTextProgressStr(current_percent, progressbar_size)
+					<< " ";
+	flush(cout);
+#endif
+
+	// restore
+	cout << restore_cursor;
+	flush(cout);
+
+	return true;
+}
+
+void StatusBarManager::add_progress_message(Progress* message)
+{
+	if (message == nullptr)
+	{
+		return;
+	}
+
+	m_progress_messages.push_back(message);
+}
+
+void StatusBarManager::clear()
+{
+	m_progress_messages.clear();
+}