forked from Bananymous/banan-os
414 lines
9.1 KiB
C++
414 lines
9.1 KiB
C++
#include "Terminal.h"
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#include <BAN/Debug.h>
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#include <BAN/UTF8.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <sys/select.h>
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#include <unistd.h>
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void Terminal::start_shell()
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{
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int shell_stdin[2];
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if (pipe(shell_stdin) == -1)
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{
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dwarnln("pipe: {}", strerror(errno));
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exit(1);
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}
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int shell_stdout[2];
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if (pipe(shell_stdout) == -1)
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{
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dwarnln("pipe: {}", strerror(errno));
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exit(1);
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}
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int shell_stderr[2];
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if (pipe(shell_stderr) == -1)
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{
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dwarnln("pipe: {}", strerror(errno));
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exit(1);
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}
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pid_t shell_pid = fork();
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if (shell_pid == 0)
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{
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if (dup2(shell_stdin[0], STDIN_FILENO) == -1)
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{
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dwarnln("dup2: {}", strerror(errno));
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exit(1);
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}
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close(shell_stdin[0]);
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close(shell_stdin[1]);
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if (dup2(shell_stdout[1], STDOUT_FILENO) == -1)
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{
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dwarnln("dup2: {}", strerror(errno));
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exit(1);
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}
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close(shell_stdout[0]);
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close(shell_stdout[1]);
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if (dup2(shell_stderr[1], STDERR_FILENO) == -1)
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{
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dwarnln("dup2: {}", strerror(errno));
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exit(1);
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}
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close(shell_stderr[0]);
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close(shell_stderr[1]);
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execl("/bin/Shell", "Shell", NULL);
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exit(1);
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}
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if (shell_pid == -1)
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{
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dwarnln("fork: {}", strerror(errno));
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exit(1);
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}
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close(shell_stdin[0]);
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close(shell_stdout[1]);
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close(shell_stderr[1]);
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m_shell_info = {
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.in = shell_stdin[1],
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.out = shell_stdout[0],
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.err = shell_stderr[0],
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.pid = shell_pid
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};
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}
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static volatile bool s_shell_exited = false;
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void Terminal::run()
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{
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signal(SIGCHLD, [](int) { s_shell_exited = true; });
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start_shell();
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m_window = MUST(LibGUI::Window::create(600, 400, "Terminal"_sv));
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m_window->fill(m_bg_color);
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m_window->invalidate();
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m_font = MUST(LibFont::Font::load("/usr/share/fonts/lat0-16.psfu"_sv));
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m_window->set_key_event_callback([&](LibGUI::EventPacket::KeyEvent event) { on_key_event(event); });
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const int max_fd = BAN::Math::max(BAN::Math::max(m_shell_info.out, m_shell_info.err), m_window->server_fd());
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while (!s_shell_exited)
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{
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fd_set fds;
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FD_ZERO(&fds);
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FD_SET(m_shell_info.out, &fds);
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FD_SET(m_shell_info.err, &fds);
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FD_SET(m_window->server_fd(), &fds);
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select(max_fd + 1, &fds, nullptr, nullptr, nullptr);
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if (FD_ISSET(m_shell_info.out, &fds))
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if (!read_shell(m_shell_info.out))
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break;
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if (FD_ISSET(m_shell_info.err, &fds))
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if (!read_shell(m_shell_info.err))
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break;
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if (FD_ISSET(m_window->server_fd(), &fds))
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m_window->poll_events();
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}
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}
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bool Terminal::read_shell(int fd)
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{
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char buffer[128];
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ssize_t nread = read(fd, buffer, sizeof(buffer) - 1);
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if (nread < 0)
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dwarnln("read: {}", strerror(errno));
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if (nread <= 0)
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return false;
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for (ssize_t i = 0; i < nread; i++)
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putchar(buffer[i]);
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return true;
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}
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void Terminal::handle_sgr()
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{
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constexpr uint32_t colors_default[] {
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0x555555,
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0xFF5555,
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0x55FF55,
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0xFFFF55,
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0x5555FF,
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0xFF55FF,
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0x55FFFF,
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0xFFFFFF,
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};
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constexpr uint32_t colors_bright[] {
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0xAAAAAA,
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0xFFAAAA,
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0xAAFFAA,
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0xFFFFAA,
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0xAAAAFF,
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0xFFAAFF,
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0xAAFFFF,
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0xFFFFFF,
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};
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switch (m_csi_info.fields[0])
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{
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case -1: case 0:
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m_fg_color = 0xFFFFFF;
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m_bg_color = 0x000000;
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break;
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case 30: case 31: case 32: case 33: case 34: case 35: case 36: case 37:
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m_fg_color = colors_default[m_csi_info.fields[0] - 30];
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break;
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case 40: case 41: case 42: case 43: case 44: case 45: case 46: case 47:
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m_bg_color = colors_default[m_csi_info.fields[0] - 40];
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break;
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case 90: case 91: case 92: case 93: case 94: case 95: case 96: case 97:
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m_fg_color = colors_bright[m_csi_info.fields[0] - 90];
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break;
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case 100: case 101: case 102: case 103: case 104: case 105: case 106: case 107:
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m_bg_color = colors_bright[m_csi_info.fields[0] - 100];
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break;
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default:
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dprintln("TODO: SGR {}", m_csi_info.fields[0]);
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break;
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}
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}
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void Terminal::handle_csi(char ch)
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{
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if (ch == ';')
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{
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m_csi_info.index++;
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return;
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}
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if (ch == '?')
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return;
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if (isdigit(ch))
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{
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if (m_csi_info.index <= 1)
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{
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auto& field = m_csi_info.fields[m_csi_info.index];
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field = (BAN::Math::max(field, 0) * 10) + (ch - '0');
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}
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return;
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}
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switch (ch)
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{
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case 'C':
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if (m_csi_info.fields[0] == -1)
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m_csi_info.fields[0] = 1;
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m_cursor.x = BAN::Math::clamp<int32_t>(m_cursor.x + m_csi_info.fields[0], 0, cols() - 1);
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break;
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case 'D':
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if (m_csi_info.fields[0] == -1)
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m_csi_info.fields[0] = 1;
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m_cursor.x = BAN::Math::clamp<int32_t>((int32_t)m_cursor.x - m_csi_info.fields[0], 0, cols() - 1);
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break;
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case 'G':
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m_cursor.x = BAN::Math::clamp<int32_t>(m_csi_info.fields[0], 1, cols()) - 1;
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break;
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case 'H':
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m_cursor.y = BAN::Math::clamp<int32_t>(m_csi_info.fields[0], 1, rows()) - 1;
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m_cursor.x = BAN::Math::clamp<int32_t>(m_csi_info.fields[1], 1, cols()) - 1;
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break;
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case 'J':
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{
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uint32_t rects[2][4] { { (uint32_t)-1 }, { (uint32_t)-1 } };
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if (m_csi_info.fields[0] == -1 || m_csi_info.fields[0] == 0)
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{
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rects[0][0] = m_cursor.x * m_font.width();
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rects[0][1] = m_cursor.y * m_font.height();
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rects[0][2] = m_window->width() - rects[0][0];
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rects[0][3] = m_font.height();
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rects[1][0] = 0;
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rects[1][1] = (m_cursor.y + 1) * m_font.height();
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rects[1][2] = m_window->width();
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rects[1][3] = m_window->height() - rects[1][1];
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}
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else if (m_csi_info.fields[0] == 1)
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{
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rects[0][0] = 0;
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rects[0][1] = m_cursor.y * m_font.height();
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rects[0][2] = m_cursor.x * m_font.width();
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rects[0][3] = m_font.height();
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rects[1][0] = 0;
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rects[1][1] = 0;
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rects[1][2] = m_window->width();
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rects[1][3] = m_cursor.y * m_font.height();
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}
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else
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{
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rects[0][0] = 0;
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rects[0][1] = 0;
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rects[0][2] = m_window->width();
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rects[0][3] = m_window->height();
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}
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for (int i = 0; i < 2; i++)
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{
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if (rects[i][0] == (uint32_t)-1)
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continue;
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m_window->fill_rect(rects[i][0], rects[i][1], rects[i][2], rects[i][3], m_bg_color);
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m_window->invalidate(rects[i][0], rects[i][1], rects[i][2], rects[i][3]);
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}
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break;
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}
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case 'K':
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{
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m_csi_info.fields[0] = BAN::Math::max(m_csi_info.fields[0], 0);
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uint32_t rect[4];
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rect[0] = (m_csi_info.fields[0] == 0) ? m_cursor.x * m_font.width() : 0;
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rect[1] = m_cursor.y * m_font.height();
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rect[2] = (m_csi_info.fields[0] == 1) ? m_cursor.x * m_font.width() : m_window->width() - rect[0];
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rect[3] = m_font.height();
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m_window->fill_rect(rect[0], rect[1], rect[2], rect[3], m_bg_color);
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m_window->invalidate(rect[0], rect[1], rect[2], rect[3]);
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break;
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}
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case 'm':
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handle_sgr();
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break;
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case 's':
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m_saved_cursor = m_cursor;
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break;
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case 'u':
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m_cursor = m_saved_cursor;
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break;
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default:
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dprintln("TODO: CSI {}", ch);
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break;
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}
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m_state = State::Normal;
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}
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void Terminal::putchar(uint8_t ch)
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{
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if (m_state == State::ESC)
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{
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if (ch != '[')
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{
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dprintln("unknown escape character 0x{2H}", ch);
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m_state = State::Normal;
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return;
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}
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m_state = State::CSI;
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m_csi_info.index = 0;
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m_csi_info.fields[0] = -1;
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m_csi_info.fields[1] = -1;
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return;
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}
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if (m_state == State::CSI)
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{
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if (ch < 0x20 || ch > 0xFE)
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{
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dprintln("invalid CSI 0x{2H}", ch);
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m_state = State::Normal;
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return;
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}
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handle_csi(ch);
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return;
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}
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m_utf8_bytes[m_utf8_index++] = ch;
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const size_t utf8_len = BAN::UTF8::byte_length(m_utf8_bytes[0]);
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if (utf8_len == 0)
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{
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dwarnln("invalid utf8 leading byte 0x{2H}", ch);
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m_utf8_index = 0;
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return;
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}
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if (m_utf8_index < utf8_len)
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return;
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const uint32_t codepoint = BAN::UTF8::to_codepoint(m_utf8_bytes);
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m_utf8_index = 0;
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if (codepoint == BAN::UTF8::invalid)
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{
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char utf8_hex[20];
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char* ptr = utf8_hex;
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for (uint8_t i = 0; i < utf8_len; i++)
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{
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*ptr++ = '0';
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*ptr++ = 'x';
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*ptr++ = (m_utf8_bytes[i] >> 4) < 10 ? (m_utf8_bytes[i] >> 4) + '0' : (m_utf8_bytes[i] >> 4) - 10 + 'A';
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*ptr++ = (m_utf8_bytes[i] & 0xF) < 10 ? (m_utf8_bytes[i] & 0xF) + '0' : (m_utf8_bytes[i] & 0xF) - 10 + 'A';
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*ptr++ = ' ';
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}
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*--ptr = '\0';
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dwarnln("invalid utf8 {}", utf8_hex);
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return;
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}
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switch (codepoint)
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{
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case '\e':
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m_state = State::ESC;
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break;
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case '\n':
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m_cursor.x = 0;
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m_cursor.y++;
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break;
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case '\r':
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m_cursor.x = 0;
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break;
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case '\b':
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if (m_cursor.x > 0)
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m_cursor.x--;
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break;
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default:
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{
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const uint32_t cell_w = m_font.width();
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const uint32_t cell_h = m_font.height();
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const uint32_t cell_x = m_cursor.x * cell_w;
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const uint32_t cell_y = m_cursor.y * cell_h;
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m_window->fill_rect(cell_x, cell_y, cell_w, cell_h, m_bg_color);
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m_window->draw_character(codepoint, m_font, cell_x, cell_y, m_fg_color);
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m_window->invalidate(cell_x, cell_y, cell_w, cell_h);
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m_cursor.x++;
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break;
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}
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}
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if (m_cursor.x >= cols())
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{
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m_cursor.x = 0;
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m_cursor.y++;
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}
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if (m_cursor.y >= rows())
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{
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uint32_t scroll = m_cursor.y - rows() + 1;
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m_cursor.y -= scroll;
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m_window->shift_vertical(-scroll * (int32_t)m_font.height());
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m_window->fill_rect(0, m_window->height() - scroll * m_font.height(), m_window->width(), scroll * m_font.height(), m_bg_color);
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m_window->invalidate();
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}
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}
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void Terminal::on_key_event(LibGUI::EventPacket::KeyEvent event)
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{
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if (event.released())
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return;
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if (const char* text = LibInput::key_to_utf8_ansi(event.key, event.modifier))
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write(m_shell_info.in, text, strlen(text));
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}
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