264 lines
7.6 KiB
C++
264 lines
7.6 KiB
C++
// includes
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extern "C" {
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#include "../libs/libgrapheme/grapheme.h"
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#include "../libs/unicode_width/unicode_width.h"
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}
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#include "../include/ui.h"
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termios orig_termios;
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uint32_t rows, cols;
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int show_cursor = 0;
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std::vector<ScreenCell> screen;
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std::vector<ScreenCell> old_screen;
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std::mutex screen_mutex;
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int display_width(const char *str) {
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if (!str)
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return 0;
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if (!strlen(str))
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return 0;
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if (str[0] == '\t')
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return 4;
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unicode_width_state_t state;
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unicode_width_init(&state);
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int width = 0;
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for (size_t j = 0; j < strlen(str); j++) {
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unsigned char c = str[j];
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if (c < 128) {
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int char_width = unicode_width_process(&state, c);
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if (char_width > 0)
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width += char_width;
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} else {
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uint_least32_t cp;
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size_t bytes = grapheme_decode_utf8(str + j, strlen(str) - j, &cp);
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if (bytes > 1) {
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int char_width = unicode_width_process(&state, cp);
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if (char_width > 0)
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width += char_width;
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j += bytes - 1;
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}
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}
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}
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return width;
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}
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void get_terminal_size() {
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struct winsize w;
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ioctl(0, TIOCGWINSZ, &w);
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rows = w.ws_row;
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cols = w.ws_col;
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}
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void die(const char *s) {
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perror(s);
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disable_raw_mode();
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exit(EXIT_FAILURE);
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}
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void enable_raw_mode() {
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if (tcgetattr(STDIN_FILENO, &orig_termios) == -1)
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die("tcgetattr");
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atexit(disable_raw_mode);
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struct termios raw = orig_termios;
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raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
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raw.c_oflag &= ~(OPOST);
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raw.c_cflag |= (CS8);
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raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
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raw.c_lflag |= ISIG;
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raw.c_cc[VMIN] = 0;
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raw.c_cc[VTIME] = 0;
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1)
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die("tcsetattr");
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std::string os = "\x1b[?1049h\x1b[2 q\x1b[?1002h\x1b[?25l";
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write(STDOUT_FILENO, os.c_str(), os.size());
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}
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void disable_raw_mode() {
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std::string os = "\x1b[?1049l\x1b[2 q\x1b[?1002l\x1b[?25h";
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write(STDOUT_FILENO, os.c_str(), os.size());
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios) == -1) {
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perror("tcsetattr");
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exit(EXIT_FAILURE);
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}
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}
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Coord start_screen() {
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enable_raw_mode();
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get_terminal_size();
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screen.assign(rows * cols, {}); // allocate & zero-init
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old_screen.assign(rows * cols, {}); // allocate & zero-init
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return {rows, cols};
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}
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void end_screen() { disable_raw_mode(); }
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Coord get_size() { return {rows, cols}; }
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void update(uint32_t row, uint32_t col, const char *utf8, uint32_t fg,
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uint32_t bg, uint8_t flags) {
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if (row >= rows || col >= cols)
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return;
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uint32_t idx = row * cols + col;
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std::lock_guard<std::mutex> lock(screen_mutex);
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screen[idx].utf8 = utf8 ? utf8 : "";
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screen[idx].fg = fg;
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screen[idx].bg = bg;
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screen[idx].flags = flags;
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}
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bool ends_with(const std::string &string_to_check) {
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size_t len = string_to_check.size();
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if (len < 3)
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return false;
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return (string_to_check[len - 3] == VS16_BYTE_A) &&
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(string_to_check[len - 2] == VS16_BYTE_B) &&
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(string_to_check[len - 1] == VS16_BYTE_C);
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}
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void render() {
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static bool first_render = true;
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uint32_t current_fg = 0;
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uint32_t current_bg = 0;
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bool current_italic = false;
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bool current_bold = false;
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bool current_underline = false;
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std::lock_guard<std::mutex> lock(screen_mutex);
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std::string out;
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out.reserve(static_cast<size_t>(rows) * static_cast<size_t>(cols) * 4 + 256);
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out += "\x1b[s\x1b[?25l";
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if (first_render) {
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out += "\x1b[2J\x1b[H";
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first_render = false;
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}
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for (uint32_t row = 0; row < rows; ++row) {
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int first_change_col = -1;
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int last_change_col = -1;
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for (uint32_t col = 0; col < cols; ++col) {
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uint32_t idx = row * cols + col;
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ScreenCell &old_cell = old_screen[idx];
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ScreenCell &new_cell = screen[idx];
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bool content_changed = old_cell.utf8 != new_cell.utf8;
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bool style_changed =
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(old_cell.fg != new_cell.fg) || (old_cell.bg != new_cell.bg) ||
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((old_cell.flags & CF_ITALIC) != (new_cell.flags & CF_ITALIC)) ||
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((old_cell.flags & CF_BOLD) != (new_cell.flags & CF_BOLD)) ||
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((old_cell.flags & CF_UNDERLINE) != (new_cell.flags & CF_UNDERLINE));
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if (content_changed || style_changed) {
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if (first_change_col == -1)
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first_change_col = col;
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last_change_col = col;
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}
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}
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if (first_change_col == -1)
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continue;
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char buf[64];
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snprintf(buf, sizeof(buf), "\x1b[%d;%dH", row + 1, first_change_col + 1);
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out.append(buf);
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for (int col = first_change_col; col <= last_change_col; ++col) {
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int idx = row * cols + col;
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ScreenCell &old_cell = old_screen[idx];
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ScreenCell &new_cell = screen[idx];
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if (current_fg != new_cell.fg) {
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if (new_cell.fg) {
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char fb[64];
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snprintf(fb, sizeof(fb), "\x1b[38;2;%d;%d;%dm",
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(new_cell.fg >> 16) & 0xFF, (new_cell.fg >> 8) & 0xFF,
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(new_cell.fg >> 0) & 0xFF);
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out.append(fb);
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} else {
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out += "\x1b[39m";
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}
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current_fg = new_cell.fg;
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}
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if (current_bg != new_cell.bg) {
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if (new_cell.bg) {
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char bb[64];
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snprintf(bb, sizeof(bb), "\x1b[48;2;%d;%d;%dm",
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(new_cell.bg >> 16) & 0xFF, (new_cell.bg >> 8) & 0xFF,
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(new_cell.bg >> 0) & 0xFF);
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out.append(bb);
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} else {
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out += "\x1b[49m";
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}
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current_bg = new_cell.bg;
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}
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bool italic = (new_cell.flags & CF_ITALIC) != 0;
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if (italic != current_italic) {
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out += italic ? "\x1b[3m" : "\x1b[23m";
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current_italic = italic;
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}
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bool bold = (new_cell.flags & CF_BOLD) != 0;
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if (bold != current_bold) {
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out += bold ? "\x1b[1m" : "\x1b[22m";
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current_bold = bold;
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}
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bool underline = (new_cell.flags & CF_UNDERLINE) != 0;
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if (underline != current_underline) {
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out += underline ? "\x1b[4m" : "\x1b[24m";
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current_underline = underline;
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}
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if (!new_cell.utf8.empty()) {
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if (new_cell.utf8[0] == '\t') {
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out.append(" ");
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} else {
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// HACK: This is a hack to work around the fact that emojis should be
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// double width but handling them as so requires a lot of
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// calculations for word wrapping so eventually have to do that
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// and render them as the 2 wide they should be.
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if (new_cell.utf8.size() > 1) {
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if (new_cell.utf8.size() >= 3 && ends_with(new_cell.utf8)) {
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out.append(new_cell.utf8.substr(0, new_cell.utf8.size() - 3));
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out.append("\xEF\xB8\x8E");
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} else {
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out.append(new_cell.utf8);
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out.append("\xEF\xB8\x8E");
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}
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} else {
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out.append(new_cell.utf8);
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}
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}
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} else {
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out.append(1, ' ');
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}
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old_cell.utf8 = new_cell.utf8;
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old_cell.fg = new_cell.fg;
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old_cell.bg = new_cell.bg;
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old_cell.flags = new_cell.flags;
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}
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}
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out += "\x1b[0m";
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out += "\x1b[u";
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if (show_cursor)
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out += "\x1b[?25h";
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const char *ptr = out.data();
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size_t remaining = out.size();
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while (remaining > 0) {
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ssize_t written = write(STDOUT_FILENO, ptr, remaining);
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if (written == 0) {
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break;
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} else if (written == -1) {
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if (errno == EINTR)
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continue;
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die("write failed");
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break;
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} else {
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ptr += written;
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remaining -= written;
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}
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}
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}
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void set_cursor(int row, int col, int show_cursor_param) {
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char buf[32];
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int n = snprintf(buf, sizeof(buf), "\x1b[%d;%dH\x1b[5 q", row + 1, col + 1);
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show_cursor = show_cursor_param;
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write(STDOUT_FILENO, buf, n);
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}
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