2021-10-21 03:53:18 +00:00
|
|
|
/** Includes */
|
2021-10-21 04:03:25 +00:00
|
|
|
#define _DEFAULT_SOURCE
|
|
|
|
#define _BSD_SOURCE
|
|
|
|
#define _GNU_SOURCE
|
|
|
|
|
2021-10-21 03:13:21 +00:00
|
|
|
#include <ctype.h>
|
|
|
|
#include <errno.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include <sys/ioctl.h>
|
2021-10-21 03:53:18 +00:00
|
|
|
#include <sys/types.h>
|
2021-10-21 03:13:21 +00:00
|
|
|
#include <termios.h>
|
|
|
|
#include <unistd.h>
|
|
|
|
|
2021-10-21 03:53:18 +00:00
|
|
|
/** defines */
|
2021-10-21 04:20:56 +00:00
|
|
|
#define TTED_VERSION "0.0.1"
|
2021-10-21 03:13:21 +00:00
|
|
|
#define CTRL_KEY(k) ((k) & 0x1f)
|
|
|
|
|
2021-10-21 03:37:39 +00:00
|
|
|
enum editorKey {
|
|
|
|
ARROW_LEFT = 1000,
|
|
|
|
ARROW_RIGHT,
|
|
|
|
ARROW_UP,
|
|
|
|
ARROW_DOWN,
|
|
|
|
DEL_KEY,
|
|
|
|
HOME_KEY,
|
|
|
|
END_KEY,
|
|
|
|
PAGE_UP,
|
|
|
|
PAGE_DOWN
|
|
|
|
};
|
|
|
|
|
2021-10-21 03:13:21 +00:00
|
|
|
|
2021-10-21 03:53:18 +00:00
|
|
|
/** data */
|
|
|
|
typedef struct erow {
|
|
|
|
int size;
|
|
|
|
char *chars;
|
|
|
|
} erow;
|
|
|
|
|
2021-10-21 03:13:21 +00:00
|
|
|
struct editorConfig {
|
2021-10-21 03:14:49 +00:00
|
|
|
int cx, cy;
|
2021-10-21 04:20:56 +00:00
|
|
|
int rowoff;
|
2021-10-21 03:13:21 +00:00
|
|
|
int screenrows;
|
|
|
|
int screencols;
|
2021-10-21 03:53:18 +00:00
|
|
|
int numrows;
|
2021-10-21 04:03:25 +00:00
|
|
|
erow *row;
|
2021-10-21 03:13:21 +00:00
|
|
|
struct termios orig_termios;
|
|
|
|
};
|
|
|
|
struct editorConfig E;
|
|
|
|
|
2021-10-21 03:53:18 +00:00
|
|
|
/** terminal */
|
2021-10-21 03:14:49 +00:00
|
|
|
void die(const char *s) {
|
2021-10-21 03:13:21 +00:00
|
|
|
write(STDOUT_FILENO, "\x1b[2J", 4);
|
|
|
|
write(STDOUT_FILENO, "\x1b[H", 3);
|
|
|
|
|
|
|
|
perror(s);
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
void disableRawMode() {
|
2021-10-21 03:14:49 +00:00
|
|
|
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &E.orig_termios) == -1) {
|
2021-10-21 03:13:21 +00:00
|
|
|
die("tcsetattr");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void enableRawMode() {
|
2021-10-21 03:14:49 +00:00
|
|
|
if (tcgetattr(STDIN_FILENO, &E.orig_termios) == -1) die("tcgetattr");
|
2021-10-21 03:13:21 +00:00
|
|
|
|
|
|
|
atexit(disableRawMode);
|
|
|
|
|
|
|
|
struct termios raw = E.orig_termios;
|
|
|
|
raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
|
|
|
|
raw.c_oflag &= ~(OPOST);
|
|
|
|
raw.c_cflag |= (CS8);
|
|
|
|
raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
|
|
|
|
raw.c_cc[VMIN] = 0;
|
|
|
|
raw.c_cc[VTIME] = 1;
|
|
|
|
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) die("tcsetattr");
|
|
|
|
}
|
|
|
|
|
2021-10-21 03:37:39 +00:00
|
|
|
int editorReadKey() {
|
2021-10-21 03:13:21 +00:00
|
|
|
int nread;
|
|
|
|
char c;
|
2021-10-21 03:14:49 +00:00
|
|
|
while ((nread = read(STDIN_FILENO, &c, 1)) != 1) {
|
2021-10-21 03:13:21 +00:00
|
|
|
if (nread == -1 && errno != EAGAIN) die("read");
|
|
|
|
}
|
2021-10-21 03:37:39 +00:00
|
|
|
|
|
|
|
if (c == '\x1b') {
|
|
|
|
char seq[3];
|
|
|
|
if (read(STDIN_FILENO, &seq[0], 1) != 1) return '\x1b';
|
|
|
|
if (read(STDIN_FILENO, &seq[1], 1) != 1) return '\x1b';
|
|
|
|
if (seq[0] == '[') {
|
|
|
|
if (seq[1] >= '0' && seq[1] <= '9') {
|
|
|
|
if (read(STDIN_FILENO, &seq[2], 1) != 1) return '\x1b';
|
|
|
|
if (seq[2] == '~') {
|
|
|
|
switch (seq[1]) {
|
|
|
|
case '1':
|
|
|
|
return HOME_KEY;
|
|
|
|
case '3':
|
|
|
|
return DEL_KEY;
|
|
|
|
case '4':
|
|
|
|
return END_KEY;
|
|
|
|
case '5':
|
|
|
|
return PAGE_UP;
|
|
|
|
case '6':
|
|
|
|
return PAGE_DOWN;
|
|
|
|
case '7':
|
|
|
|
return HOME_KEY;
|
|
|
|
case '8':
|
|
|
|
return END_KEY;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
switch (seq[1]) {
|
|
|
|
case 'A':
|
|
|
|
return ARROW_UP;
|
|
|
|
case 'B':
|
|
|
|
return ARROW_DOWN;
|
|
|
|
case 'C':
|
|
|
|
return ARROW_RIGHT;
|
|
|
|
case 'D':
|
|
|
|
return ARROW_LEFT;
|
|
|
|
case 'H':
|
|
|
|
return HOME_KEY;
|
|
|
|
case 'F':
|
|
|
|
return END_KEY;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else if (seq[0] == 'O') {
|
|
|
|
switch (seq[1]) {
|
|
|
|
case 'H':
|
|
|
|
return HOME_KEY;
|
|
|
|
case 'F':
|
|
|
|
return END_KEY;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return '\x1b';
|
|
|
|
} else {
|
|
|
|
return c;
|
|
|
|
}
|
2021-10-21 03:13:21 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
int getCursorPosition(int *rows, int *cols) {
|
|
|
|
char buf[32];
|
|
|
|
unsigned int i = 0;
|
|
|
|
if (write(STDOUT_FILENO, "\x1b[6n", 4) != 4) return -1;
|
|
|
|
|
2021-10-21 03:14:49 +00:00
|
|
|
while (i < sizeof(buf) - 1) {
|
2021-10-21 03:13:21 +00:00
|
|
|
if (read(STDIN_FILENO, &buf[i], 1) != 1) break;
|
|
|
|
if (buf[i] == 'R') break;
|
|
|
|
i++;
|
|
|
|
}
|
|
|
|
buf[i] = '\0'; //assign null to final byte
|
2021-10-21 03:14:49 +00:00
|
|
|
if (buf[0] != '\x1b' || buf[1] != '[') return -1;
|
|
|
|
if (sscanf(&buf[2], "%d;%d", rows, cols) != 2) return -1;
|
2021-10-21 03:13:21 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int getWindowSize(int *rows, int *cols) {
|
|
|
|
struct winsize ws;
|
|
|
|
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
|
2021-10-21 03:14:49 +00:00
|
|
|
if (write(STDOUT_FILENO, "\x1b[999C\x1b[999B", 12) != 12) return -1;
|
2021-10-21 03:13:21 +00:00
|
|
|
return getCursorPosition(rows, cols);
|
|
|
|
} else {
|
|
|
|
*cols = ws.ws_col;
|
|
|
|
*rows = ws.ws_row;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
2021-10-21 04:20:56 +00:00
|
|
|
|
2021-10-21 04:03:25 +00:00
|
|
|
/** Row operations */
|
|
|
|
void editorAppendRow(char *s, size_t len) {
|
2021-10-21 04:20:56 +00:00
|
|
|
E.row = realloc(E.row, sizeof(erow) * (E.numrows + 1));
|
|
|
|
|
2021-10-21 04:03:25 +00:00
|
|
|
int at = E.numrows;
|
|
|
|
E.row[at].size = len;
|
2021-10-21 04:20:56 +00:00
|
|
|
E.row[at].chars = malloc(len + 1);
|
2021-10-21 04:03:25 +00:00
|
|
|
memcpy(E.row[at].chars, s, len);
|
|
|
|
E.row[at].chars[len] = '\0';
|
|
|
|
E.numrows++;
|
|
|
|
}
|
2021-10-21 03:14:49 +00:00
|
|
|
|
2021-10-21 03:53:18 +00:00
|
|
|
/** file i/o */
|
|
|
|
void editorOpen(char *filename) {
|
|
|
|
FILE *fp = fopen(filename, "r");
|
|
|
|
if (!fp) die("fopen");
|
|
|
|
|
|
|
|
char *line = NULL;
|
2021-10-21 04:03:25 +00:00
|
|
|
size_t linecap = 0;
|
2021-10-21 03:53:18 +00:00
|
|
|
ssize_t linelen;
|
2021-10-21 04:20:56 +00:00
|
|
|
while ((linelen = getline(&line, &linecap, fp)) != -1) {
|
2021-10-21 04:03:25 +00:00
|
|
|
while (linelen > 0 && (line[linelen - 1] == '\n' ||
|
2021-10-21 03:53:18 +00:00
|
|
|
line[linelen - 1] == '\r'))
|
|
|
|
linelen--;
|
2021-10-21 04:03:25 +00:00
|
|
|
editorAppendRow(line, linelen);
|
2021-10-21 03:53:18 +00:00
|
|
|
}
|
|
|
|
free(line);
|
|
|
|
fclose(fp);
|
|
|
|
}
|
|
|
|
|
2021-10-21 04:03:25 +00:00
|
|
|
|
2021-10-21 03:53:18 +00:00
|
|
|
/** append buffer */
|
2021-10-21 03:13:21 +00:00
|
|
|
struct abuf {
|
|
|
|
char *b;
|
|
|
|
int len;
|
|
|
|
};
|
|
|
|
#define ABUF_INIT {NULL, 0}
|
2021-10-21 03:14:49 +00:00
|
|
|
|
2021-10-21 03:13:21 +00:00
|
|
|
void abAppend(struct abuf *ab, const char *s, int len) {
|
|
|
|
char *new = realloc(ab->b, ab->len + len);
|
|
|
|
|
|
|
|
if (new == NULL) return;
|
|
|
|
memcpy(&new[ab->len], s, len);
|
|
|
|
ab->b = new;
|
|
|
|
ab->len += len;
|
|
|
|
}
|
2021-10-21 03:14:49 +00:00
|
|
|
|
2021-10-21 03:13:21 +00:00
|
|
|
void abFree(struct abuf *ab) {
|
|
|
|
free(ab->b);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2021-10-21 03:53:18 +00:00
|
|
|
/** output */
|
2021-10-21 04:26:42 +00:00
|
|
|
void editorScroll() {
|
|
|
|
if (E.cy < E.rowoff){
|
|
|
|
E.rowoff = E.cy;
|
|
|
|
}
|
|
|
|
if (E.cy >= E.rowoff + E.screenrows) {
|
|
|
|
E.rowoff = E.cy - E.screenrows +1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2021-10-21 03:13:21 +00:00
|
|
|
void editorDrawRows(struct abuf *ab) {
|
|
|
|
int y;
|
2021-10-21 03:14:49 +00:00
|
|
|
for (y = 0; y < E.screenrows; y++) {
|
2021-10-21 04:26:42 +00:00
|
|
|
int filerow = y + E.rowoff;
|
|
|
|
if (filerow >= E.numrows) { // Draw rows after buffer
|
2021-10-21 04:03:25 +00:00
|
|
|
if (E.numrows == 0 && y == E.screenrows / 3) {
|
2021-10-21 03:53:18 +00:00
|
|
|
char welcome[80];
|
2021-10-21 04:20:56 +00:00
|
|
|
int welcomelen = snprintf(welcome, sizeof welcome, "Tyrel Text Editor Deluxe -- version %s",
|
|
|
|
TTED_VERSION);
|
2021-10-21 03:53:18 +00:00
|
|
|
int padding = (E.screencols - welcomelen) / 2;
|
|
|
|
if (padding) {
|
|
|
|
abAppend(ab, "~", 1);
|
|
|
|
padding--;
|
|
|
|
}
|
|
|
|
while (padding--) abAppend(ab, " ", 1);
|
|
|
|
if (welcomelen > E.screencols) welcomelen = E.screencols;
|
|
|
|
abAppend(ab, welcome, welcomelen);
|
|
|
|
} else {
|
2021-10-21 03:13:21 +00:00
|
|
|
abAppend(ab, "~", 1);
|
|
|
|
}
|
2021-10-21 03:53:18 +00:00
|
|
|
} else { // draw buffer
|
2021-10-21 04:26:42 +00:00
|
|
|
int len = E.row[filerow].size;
|
2021-10-21 03:53:18 +00:00
|
|
|
if (len > E.screencols) len = E.screencols; // truncate if further than columns
|
2021-10-21 04:26:42 +00:00
|
|
|
abAppend(ab, E.row[filerow].chars, len);
|
2021-10-21 03:13:21 +00:00
|
|
|
}
|
2021-10-21 03:53:18 +00:00
|
|
|
|
2021-10-21 03:13:21 +00:00
|
|
|
abAppend(ab, "\x1b[K", 3);
|
2021-10-21 03:14:49 +00:00
|
|
|
if (y < E.screenrows - 1) {
|
2021-10-21 03:13:21 +00:00
|
|
|
abAppend(ab, "\r\n", 2);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2021-10-21 03:14:49 +00:00
|
|
|
|
2021-10-21 03:13:21 +00:00
|
|
|
void editorRefreshScreen() {
|
2021-10-21 04:26:42 +00:00
|
|
|
editorScroll();
|
|
|
|
|
2021-10-21 03:13:21 +00:00
|
|
|
struct abuf ab = ABUF_INIT;
|
|
|
|
abAppend(&ab, "\x1b[?25l", 6);
|
2021-10-21 03:14:49 +00:00
|
|
|
abAppend(&ab, "\x1b[H", 3); // Cursor Position home
|
2021-10-21 03:13:21 +00:00
|
|
|
editorDrawRows(&ab);
|
2021-10-21 03:37:39 +00:00
|
|
|
|
|
|
|
char buf[32];
|
2021-10-21 04:26:42 +00:00
|
|
|
snprintf(buf, sizeof(buf), "\x1b[%d;%dH", (E.cy - E.rowoff) +1, E.cx + 1);
|
2021-10-21 03:37:39 +00:00
|
|
|
abAppend(&ab, buf, strlen(buf));
|
2021-10-21 03:13:21 +00:00
|
|
|
abAppend(&ab, "\x1b[?25h", 6);
|
|
|
|
|
|
|
|
write(STDOUT_FILENO, ab.b, ab.len);
|
|
|
|
abFree(&ab);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2021-10-21 03:53:18 +00:00
|
|
|
/** input */
|
2021-10-21 03:37:39 +00:00
|
|
|
void editorMoveCursor(int key) {
|
|
|
|
switch (key) {
|
|
|
|
case ARROW_LEFT:
|
|
|
|
if (E.cx != 0) {
|
|
|
|
E.cx--;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case ARROW_RIGHT:
|
|
|
|
if (E.cx != E.screencols - 1) {
|
|
|
|
E.cx++;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case ARROW_UP:
|
|
|
|
if (E.cy != 0) {
|
|
|
|
E.cy--;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case ARROW_DOWN:
|
2021-10-21 04:26:42 +00:00
|
|
|
if (E.cy != E.numrows) {
|
2021-10-21 03:37:39 +00:00
|
|
|
E.cy++;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2021-10-21 03:13:21 +00:00
|
|
|
void editorProcessKeypress() {
|
2021-10-21 03:37:39 +00:00
|
|
|
int c = editorReadKey();
|
2021-10-21 03:13:21 +00:00
|
|
|
switch (c) {
|
|
|
|
case CTRL_KEY('q'):
|
|
|
|
write(STDOUT_FILENO, "\x1b[2J", 4);
|
|
|
|
write(STDOUT_FILENO, "\x1b[H", 3);
|
|
|
|
exit(0);
|
|
|
|
break;
|
2021-10-21 03:37:39 +00:00
|
|
|
|
|
|
|
case HOME_KEY:
|
|
|
|
E.cx = 0;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case END_KEY:
|
|
|
|
E.cx = E.screencols - 1;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case PAGE_UP:
|
|
|
|
case PAGE_DOWN: {
|
|
|
|
int times = E.screenrows;
|
|
|
|
while (times--)
|
|
|
|
editorMoveCursor(c == PAGE_UP ? ARROW_UP : ARROW_DOWN);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case ARROW_UP:
|
|
|
|
case ARROW_DOWN:
|
|
|
|
case ARROW_LEFT:
|
|
|
|
case ARROW_RIGHT:
|
|
|
|
editorMoveCursor(c);
|
|
|
|
break;
|
2021-10-21 03:13:21 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2021-10-21 03:53:18 +00:00
|
|
|
/** init */
|
2021-10-21 03:13:21 +00:00
|
|
|
void initEditor() {
|
2021-10-21 03:14:49 +00:00
|
|
|
E.cx = 0;
|
|
|
|
E.cy = 0;
|
2021-10-21 04:20:56 +00:00
|
|
|
E.rowoff = 0;
|
2021-10-21 03:53:18 +00:00
|
|
|
E.numrows = 0;
|
2021-10-21 04:03:25 +00:00
|
|
|
E.row = NULL;
|
2021-10-21 03:14:49 +00:00
|
|
|
if (getWindowSize(&E.screenrows, &E.screencols) == -1) die("getWindowSize");
|
2021-10-21 03:13:21 +00:00
|
|
|
}
|
2021-10-21 03:14:49 +00:00
|
|
|
|
2021-10-21 03:53:18 +00:00
|
|
|
int main(int argc, char *argv[]) {
|
2021-10-21 03:13:21 +00:00
|
|
|
enableRawMode();
|
|
|
|
initEditor();
|
2021-10-21 03:53:18 +00:00
|
|
|
if (argc >= 2) {
|
|
|
|
editorOpen(argv[1]);
|
|
|
|
}
|
2021-10-21 03:13:21 +00:00
|
|
|
|
2021-10-21 03:14:49 +00:00
|
|
|
while (1) {
|
2021-10-21 03:13:21 +00:00
|
|
|
editorRefreshScreen();
|
|
|
|
editorProcessKeypress();
|
|
|
|
}
|
|
|
|
return 0;
|
2021-10-21 04:20:56 +00:00
|
|
|
}
|