2024-06-22 21:50:38 +02:00
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#include <stdio.h>
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2024-06-25 02:10:38 +02:00
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#include <termios.h>
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#include <unistd.h>
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2024-06-22 21:50:38 +02:00
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2024-06-25 02:10:38 +02:00
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#define VERSION "0.0.1"
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#define CTRL_KEY(k) ((k) & 0x1f)
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enum editorKey {
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ARROW_LEFT = 1000,
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ARROW_RIGHT,
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ARROW_UP,
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ARROW_DOWN,
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DEL_KEY,
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HOME_KEY,
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END_KEY,
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PAGE_UP,
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PAGE_DOWN
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};
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struct editor_config {
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int cx, cy; /* cursor x, y*/
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int screenrows, screencols;
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struct termios orig_termios;
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};
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struct editor_config config;
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void die(const char *s)
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{
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write(STDOUT_FILENO, "\x1b[2J", 4);
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write(STDOUT_FILENO, "\x1b[H", 3);
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perror(s);
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exit(1);
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}
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void disable_raw_mode()
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{
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &config.orig_termios) == -1)
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die("tcsetattr");
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}
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void enable_raw_mode()
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{
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if (tcgetattr(STDIN_FILENO, &config.orig_termios) == -1)
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die("tcgetattr");
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atexit(disable_raw_mode);
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struct termios raw = config.orig_termios;
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/* disbable echo, line output and signals */
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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_cc[VMIN] = 0;
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raw.c_cc[VTIME] = 1;
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1)
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die("tcsetattr");
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}
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int read_key()
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{
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int nread;
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char c;
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while ((nread = read(STDIN_FILENO, &c, 1)) != 1) {
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if (nread == -1 && errno != EAGAIN) die("read");
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}
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if (c == 'k') return ARROW_UP;
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if (c == 'j') return ARROW_DOWN;
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if (c == 'l') return ARROW_RIGHT;
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if (c == 'h') return ARROW_LEFT;
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if (c == '\x1b') {
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char seq[3];
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if (read(STDIN_FILENO, &seq[0], 1) != 1) return '\x1b';
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if (read(STDIN_FILENO, &seq[1], 1) != 1) return '\x1b';
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if (seq[0] == '[') {
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if (seq[1] >= '0' && seq[1] <= '9') {
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if (read(STDIN_FILENO, &seq[2], 1) != 1) return '\x1b';
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if (seq[2] == '~') {
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switch (seq[1]) {
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case '1': return HOME_KEY;
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case '3': return DEL_KEY;
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case '4': return END_KEY;
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case '5': return PAGE_UP;
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case '6': return PAGE_DOWN;
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case '7': return HOME_KEY;
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case '8': return END_KEY;
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}
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}
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} else {
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switch (seq[1]) {
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case 'A': return ARROW_UP;
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case 'B': return ARROW_DOWN;
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case 'C': return ARROW_RIGHT;
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case 'D': return ARROW_LEFT;
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case 'F': return END_KEY;
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case 'H': return HOME_KEY;
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}
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}
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} else if (seq[0] == 'O') {
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switch (seq[1]) {
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case 'F': return END_KEY;
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case 'H': return HOME_KEY;
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}
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}
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return '\x1b';
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} else {
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return c;
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}
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}
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int get_cursor_position(int *rows, int *cols)
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{
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char buf[32];
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unsigned int i = 0;
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if (write(STDOUT_FILENO, "\x1b[6n", 4) != 4)
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return -1;
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while (i < sizeof(buf) - 1) {
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if (read(STDIN_FILENO, &buf[i], 1) != 1)
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break;
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if (buf[i] == 'R')
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break;
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i++;
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}
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buf[i] = '\0';
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if (buf[0] != '\x1b' || buf[1] != '[')
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return -1;
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if (sscanf(&buf[2], "%d;%d", rows, cols) != 2)
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return -1;
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return 0;
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}
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int get_window_size(int *rows, int *cols)
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{
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struct winsize ws;
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if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
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if (write(STDOUT_FILENO, "\x1b[999C\x1b[999B", 12) != 12) return -1;
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return get_cursor_position(rows, cols);
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} else {
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*cols = ws.ws_col;
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*rows = ws.ws_row;
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return 0;
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}
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}
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struct abuf {
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char *b;
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int len;
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};
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#define ABUF_INIT {NULL, 0}
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void abAppend(struct abuf *ab, const char *s, int len)
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{
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char *new = realloc(ab->b, ab->len + len);
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if (new == NULL) return;
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memcpy(&new[ab->len], s, len);
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ab->b = new;
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ab->len += len;
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}
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void abFree(struct abuf *ab)
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2024-06-22 21:50:38 +02:00
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{
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2024-06-25 02:10:38 +02:00
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free(ab->b);
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}
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void draw_rows(struct abuf *ab) {
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for (int y = 0; y < config.screenrows; y++) {
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if (y == config.screenrows / 3) {
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char welcome[80];
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int welcomelen = snprintf(welcome, sizeof(welcome),
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"VIP v%s", VERSION);
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if (welcomelen > config.screencols) welcomelen = config.screencols;
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int padding = (config.screencols - welcomelen) / 2;
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if (padding) {
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abAppend(ab, "~", 1);
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padding--;
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}
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while (padding--) abAppend(ab, " ", 1);
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abAppend(ab, welcome, welcomelen);
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} else {
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abAppend(ab, "~", 1);
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} abAppend(ab, "\x1b[K", 3);
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if (y < config.screenrows - 1) {
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abAppend(ab, "\r\n", 2);
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}
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}
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}
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void refresh_screen()
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{
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struct abuf ab = ABUF_INIT;
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abAppend(&ab, "\x1b[?25l", 6);
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abAppend(&ab, "\x1b[H", 3);
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draw_rows(&ab);
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char buf[32];
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snprintf(buf, sizeof(buf), "\x1b[%d;%dH", config.cy + 1, config.cx + 1);
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abAppend(&ab, buf, strlen(buf));
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abAppend(&ab, "\x1b[?25h", 6);
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write(STDOUT_FILENO, ab.b, ab.len);
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abFree(&ab);
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}
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void move_cursor(int key) {
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switch (key) {
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case ARROW_LEFT:
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if (config.cx != 0) {
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config.cx--;
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}
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break;
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case ARROW_RIGHT:
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if (config.cx != config.screencols - 1) {
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config.cx++;
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}
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break;
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case ARROW_UP:
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if (config.cy != 0) {
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config.cy--;
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}
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break;
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case ARROW_DOWN:
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if (config.cy != config.screenrows - 1) {
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config.cy++;
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}
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break;
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}
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}
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void process_key()
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{
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int c = read_key();
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switch (c) {
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case CTRL_KEY('q'):
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write(STDOUT_FILENO, "\x1b[2J", 4);
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write(STDOUT_FILENO, "\x1b[H", 3);
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exit(0);
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break;
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case HOME_KEY:
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config.cx = 0;
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break;
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case END_KEY:
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config.cx = config.screencols - 1;
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break;
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case PAGE_UP:
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case PAGE_DOWN:
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{
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int times = config.screenrows;
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while (times--)
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move_cursor(c == PAGE_UP ? ARROW_UP : ARROW_DOWN);
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}
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break;
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case ARROW_UP:
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case ARROW_DOWN:
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case ARROW_LEFT:
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case ARROW_RIGHT:
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move_cursor(c);
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break;
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}
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}
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void init_editor()
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{
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config.cx = 0;
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config.cy = 0;
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if (get_window_size(&config.screenrows, &config.screencols) == -1)
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die("get_window_size");
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}
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int main()
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{
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enable_raw_mode();
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init_editor();
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while (1) {
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refresh_screen();
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process_key();
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}
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2024-06-22 21:50:38 +02:00
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return 0;
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}
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