banan-os/userspace/programs/Terminal/Terminal.cpp

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#include "Terminal.h"
#include <BAN/Debug.h>
#include <BAN/UTF8.h>
#include <ctype.h>
#include <stdlib.h>
#include <sys/select.h>
#include <unistd.h>
void Terminal::start_shell()
{
int shell_stdin[2];
if (pipe(shell_stdin) == -1)
{
dwarnln("pipe: {}", strerror(errno));
exit(1);
}
int shell_stdout[2];
if (pipe(shell_stdout) == -1)
{
dwarnln("pipe: {}", strerror(errno));
exit(1);
}
int shell_stderr[2];
if (pipe(shell_stderr) == -1)
{
dwarnln("pipe: {}", strerror(errno));
exit(1);
}
pid_t shell_pid = fork();
if (shell_pid == 0)
{
if (dup2(shell_stdin[0], STDIN_FILENO) == -1)
{
dwarnln("dup2: {}", strerror(errno));
exit(1);
}
close(shell_stdin[0]);
close(shell_stdin[1]);
if (dup2(shell_stdout[1], STDOUT_FILENO) == -1)
{
dwarnln("dup2: {}", strerror(errno));
exit(1);
}
close(shell_stdout[0]);
close(shell_stdout[1]);
if (dup2(shell_stderr[1], STDERR_FILENO) == -1)
{
dwarnln("dup2: {}", strerror(errno));
exit(1);
}
close(shell_stderr[0]);
close(shell_stderr[1]);
execl("/bin/Shell", "Shell", NULL);
exit(1);
}
if (shell_pid == -1)
{
dwarnln("fork: {}", strerror(errno));
exit(1);
}
close(shell_stdin[0]);
close(shell_stdout[1]);
close(shell_stderr[1]);
m_shell_info = {
.in = shell_stdin[1],
.out = shell_stdout[0],
.err = shell_stderr[0],
.pid = shell_pid
};
}
static volatile bool s_shell_exited = false;
void Terminal::run()
{
signal(SIGCHLD, [](int) { s_shell_exited = true; });
start_shell();
m_window = MUST(LibGUI::Window::create(600, 400, "Terminal"_sv));
m_window->fill(m_bg_color);
m_window->invalidate();
m_font = MUST(LibFont::Font::load("/usr/share/fonts/lat0-16.psfu"_sv));
m_window->set_key_event_callback([&](LibGUI::EventPacket::KeyEvent event) { on_key_event(event); });
const int max_fd = BAN::Math::max(BAN::Math::max(m_shell_info.out, m_shell_info.err), m_window->server_fd());
while (!s_shell_exited)
{
fd_set fds;
FD_ZERO(&fds);
FD_SET(m_shell_info.out, &fds);
FD_SET(m_shell_info.err, &fds);
FD_SET(m_window->server_fd(), &fds);
select(max_fd + 1, &fds, nullptr, nullptr, nullptr);
if (FD_ISSET(m_shell_info.out, &fds))
if (!read_shell(m_shell_info.out))
break;
if (FD_ISSET(m_shell_info.err, &fds))
if (!read_shell(m_shell_info.err))
break;
if (FD_ISSET(m_window->server_fd(), &fds))
m_window->poll_events();
}
}
bool Terminal::read_shell(int fd)
{
char buffer[128];
ssize_t nread = read(fd, buffer, sizeof(buffer) - 1);
if (nread < 0)
dwarnln("read: {}", strerror(errno));
if (nread <= 0)
return false;
for (ssize_t i = 0; i < nread; i++)
putchar(buffer[i]);
return true;
}
void Terminal::handle_sgr()
{
constexpr uint32_t colors_default[] {
0x555555,
0xFF5555,
0x55FF55,
0xFFFF55,
0x5555FF,
0xFF55FF,
0x55FFFF,
0xFFFFFF,
};
constexpr uint32_t colors_bright[] {
0xAAAAAA,
0xFFAAAA,
0xAAFFAA,
0xFFFFAA,
0xAAAAFF,
0xFFAAFF,
0xAAFFFF,
0xFFFFFF,
};
switch (m_csi_info.fields[0])
{
case -1: case 0:
m_fg_color = 0xFFFFFF;
m_bg_color = 0x000000;
break;
case 30: case 31: case 32: case 33: case 34: case 35: case 36: case 37:
m_fg_color = colors_default[m_csi_info.fields[0] - 30];
break;
case 40: case 41: case 42: case 43: case 44: case 45: case 46: case 47:
m_bg_color = colors_default[m_csi_info.fields[0] - 40];
break;
case 90: case 91: case 92: case 93: case 94: case 95: case 96: case 97:
m_fg_color = colors_bright[m_csi_info.fields[0] - 90];
break;
case 100: case 101: case 102: case 103: case 104: case 105: case 106: case 107:
m_bg_color = colors_bright[m_csi_info.fields[0] - 100];
break;
default:
dprintln("TODO: SGR {}", m_csi_info.fields[0]);
break;
}
}
void Terminal::handle_csi(char ch)
{
if (ch == ';')
{
m_csi_info.index++;
return;
}
if (ch == '?')
return;
if (isdigit(ch))
{
if (m_csi_info.index <= 1)
{
auto& field = m_csi_info.fields[m_csi_info.index];
field = (BAN::Math::max(field, 0) * 10) + (ch - '0');
}
return;
}
switch (ch)
{
case 'C':
if (m_csi_info.fields[0] == -1)
m_csi_info.fields[0] = 1;
m_cursor.x = BAN::Math::clamp<int32_t>(m_cursor.x + m_csi_info.fields[0], 0, cols() - 1);
break;
case 'D':
if (m_csi_info.fields[0] == -1)
m_csi_info.fields[0] = 1;
m_cursor.x = BAN::Math::clamp<int32_t>((int32_t)m_cursor.x - m_csi_info.fields[0], 0, cols() - 1);
break;
case 'G':
m_cursor.x = BAN::Math::clamp<int32_t>(m_csi_info.fields[0], 1, cols()) - 1;
break;
case 'H':
m_cursor.y = BAN::Math::clamp<int32_t>(m_csi_info.fields[0], 1, rows()) - 1;
m_cursor.x = BAN::Math::clamp<int32_t>(m_csi_info.fields[1], 1, cols()) - 1;
break;
case 'J':
{
uint32_t rects[2][4] { { (uint32_t)-1 }, { (uint32_t)-1 } };
if (m_csi_info.fields[0] == -1 || m_csi_info.fields[0] == 0)
{
rects[0][0] = m_cursor.x * m_font.width();
rects[0][1] = m_cursor.y * m_font.height();
rects[0][2] = m_window->width() - rects[0][0];
rects[0][3] = m_font.height();
rects[1][0] = 0;
rects[1][1] = (m_cursor.y + 1) * m_font.height();
rects[1][2] = m_window->width();
rects[1][3] = m_window->height() - rects[1][1];
}
else if (m_csi_info.fields[0] == 1)
{
rects[0][0] = 0;
rects[0][1] = m_cursor.y * m_font.height();
rects[0][2] = m_cursor.x * m_font.width();
rects[0][3] = m_font.height();
rects[1][0] = 0;
rects[1][1] = 0;
rects[1][2] = m_window->width();
rects[1][3] = m_cursor.y * m_font.height();
}
else
{
rects[0][0] = 0;
rects[0][1] = 0;
rects[0][2] = m_window->width();
rects[0][3] = m_window->height();
}
for (int i = 0; i < 2; i++)
{
if (rects[i][0] == (uint32_t)-1)
continue;
m_window->fill_rect(rects[i][0], rects[i][1], rects[i][2], rects[i][3], m_bg_color);
m_window->invalidate(rects[i][0], rects[i][1], rects[i][2], rects[i][3]);
}
break;
}
case 'K':
{
m_csi_info.fields[0] = BAN::Math::max(m_csi_info.fields[0], 0);
uint32_t rect[4];
rect[0] = (m_csi_info.fields[0] == 0) ? m_cursor.x * m_font.width() : 0;
rect[1] = m_cursor.y * m_font.height();
rect[2] = (m_csi_info.fields[0] == 1) ? m_cursor.x * m_font.width() : m_window->width() - rect[0];
rect[3] = m_font.height();
m_window->fill_rect(rect[0], rect[1], rect[2], rect[3], m_bg_color);
m_window->invalidate(rect[0], rect[1], rect[2], rect[3]);
break;
}
case 'm':
handle_sgr();
break;
case 's':
m_saved_cursor = m_cursor;
break;
case 'u':
m_cursor = m_saved_cursor;
break;
default:
dprintln("TODO: CSI {}", ch);
break;
}
m_state = State::Normal;
}
void Terminal::putchar(uint32_t codepoint)
{
if (m_state == State::ESC)
{
if (codepoint != '[')
{
dprintln("unknown escape character 0x{H}", codepoint);
m_state = State::Normal;
return;
}
m_state = State::CSI;
m_csi_info.index = 0;
m_csi_info.fields[0] = -1;
m_csi_info.fields[1] = -1;
return;
}
if (m_state == State::CSI)
{
if (codepoint < 0x20 || codepoint > 0xFE)
{
dprintln("invalid CSI 0x{H}", codepoint);
m_state = State::Normal;
return;
}
handle_csi(codepoint);
return;
}
switch (codepoint)
{
case '\e':
m_state = State::ESC;
break;
case '\n':
m_cursor.x = 0;
m_cursor.y++;
break;
case '\r':
m_cursor.x = 0;
break;
case '\b':
if (m_cursor.x > 0)
m_cursor.x--;
break;
default:
{
const uint32_t cell_w = m_font.width();
const uint32_t cell_h = m_font.height();
const uint32_t cell_x = m_cursor.x * cell_w;
const uint32_t cell_y = m_cursor.y * cell_h;
m_window->fill_rect(cell_x, cell_y, cell_w, cell_h, m_bg_color);
m_window->draw_character(codepoint, m_font, cell_x, cell_y, m_fg_color);
m_window->invalidate(cell_x, cell_y, cell_w, cell_h);
m_cursor.x++;
break;
}
}
if (m_cursor.x >= cols())
{
m_cursor.x = 0;
m_cursor.y++;
}
if (m_cursor.y >= rows())
{
uint32_t scroll = m_cursor.y - rows() + 1;
m_cursor.y -= scroll;
m_window->shift_vertical(-scroll * (int32_t)m_font.height());
m_window->fill_rect(0, m_window->height() - scroll * m_font.height(), m_window->width(), scroll * m_font.height(), m_bg_color);
m_window->invalidate();
}
}
void Terminal::on_key_event(LibGUI::EventPacket::KeyEvent event)
{
if (event.released())
return;
if (const char* text = LibInput::key_to_utf8_ansi(event.key, event.modifier))
write(m_shell_info.in, text, strlen(text));
}