add basic movement and ui

This commit is contained in:
Night Kaly 2024-06-25 01:10:38 +01:00
parent 0dba0b4d55
commit 50fbc03e20
Signed by: night0721
GPG key ID: 957D67B8DB7A119B

292
vip.c
View file

@ -1,7 +1,295 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <unistd.h>
int main(int argc, char **argv)
#define VERSION "0.0.1"
#define CTRL_KEY(k) ((k) & 0x1f)
enum editorKey {
ARROW_LEFT = 1000,
ARROW_RIGHT,
ARROW_UP,
ARROW_DOWN,
DEL_KEY,
HOME_KEY,
END_KEY,
PAGE_UP,
PAGE_DOWN
};
struct editor_config {
int cx, cy; /* cursor x, y*/
int screenrows, screencols;
struct termios orig_termios;
};
struct editor_config config;
void die(const char *s)
{
printf("vip 0.1\n");
write(STDOUT_FILENO, "\x1b[2J", 4);
write(STDOUT_FILENO, "\x1b[H", 3);
perror(s);
exit(1);
}
void disable_raw_mode()
{
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &config.orig_termios) == -1)
die("tcsetattr");
}
void enable_raw_mode()
{
if (tcgetattr(STDIN_FILENO, &config.orig_termios) == -1)
die("tcgetattr");
atexit(disable_raw_mode);
struct termios raw = config.orig_termios;
/* disbable echo, line output and signals */
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");
}
int read_key()
{
int nread;
char c;
while ((nread = read(STDIN_FILENO, &c, 1)) != 1) {
if (nread == -1 && errno != EAGAIN) die("read");
}
if (c == 'k') return ARROW_UP;
if (c == 'j') return ARROW_DOWN;
if (c == 'l') return ARROW_RIGHT;
if (c == 'h') return ARROW_LEFT;
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 'F': return END_KEY;
case 'H': return HOME_KEY;
}
}
} else if (seq[0] == 'O') {
switch (seq[1]) {
case 'F': return END_KEY;
case 'H': return HOME_KEY;
}
}
return '\x1b';
} else {
return c;
}
}
int get_cursor_position(int *rows, int *cols)
{
char buf[32];
unsigned int i = 0;
if (write(STDOUT_FILENO, "\x1b[6n", 4) != 4)
return -1;
while (i < sizeof(buf) - 1) {
if (read(STDIN_FILENO, &buf[i], 1) != 1)
break;
if (buf[i] == 'R')
break;
i++;
}
buf[i] = '\0';
if (buf[0] != '\x1b' || buf[1] != '[')
return -1;
if (sscanf(&buf[2], "%d;%d", rows, cols) != 2)
return -1;
return 0;
}
int get_window_size(int *rows, int *cols)
{
struct winsize ws;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
if (write(STDOUT_FILENO, "\x1b[999C\x1b[999B", 12) != 12) return -1;
return get_cursor_position(rows, cols);
} else {
*cols = ws.ws_col;
*rows = ws.ws_row;
return 0;
}
}
struct abuf {
char *b;
int len;
};
#define ABUF_INIT {NULL, 0}
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;
}
void abFree(struct abuf *ab)
{
free(ab->b);
}
void draw_rows(struct abuf *ab) {
for (int y = 0; y < config.screenrows; y++) {
if (y == config.screenrows / 3) {
char welcome[80];
int welcomelen = snprintf(welcome, sizeof(welcome),
"VIP v%s", VERSION);
if (welcomelen > config.screencols) welcomelen = config.screencols;
int padding = (config.screencols - welcomelen) / 2;
if (padding) {
abAppend(ab, "~", 1);
padding--;
}
while (padding--) abAppend(ab, " ", 1);
abAppend(ab, welcome, welcomelen);
} else {
abAppend(ab, "~", 1);
} abAppend(ab, "\x1b[K", 3);
if (y < config.screenrows - 1) {
abAppend(ab, "\r\n", 2);
}
}
}
void refresh_screen()
{
struct abuf ab = ABUF_INIT;
abAppend(&ab, "\x1b[?25l", 6);
abAppend(&ab, "\x1b[H", 3);
draw_rows(&ab);
char buf[32];
snprintf(buf, sizeof(buf), "\x1b[%d;%dH", config.cy + 1, config.cx + 1);
abAppend(&ab, buf, strlen(buf));
abAppend(&ab, "\x1b[?25h", 6);
write(STDOUT_FILENO, ab.b, ab.len);
abFree(&ab);
}
void move_cursor(int key) {
switch (key) {
case ARROW_LEFT:
if (config.cx != 0) {
config.cx--;
}
break;
case ARROW_RIGHT:
if (config.cx != config.screencols - 1) {
config.cx++;
}
break;
case ARROW_UP:
if (config.cy != 0) {
config.cy--;
}
break;
case ARROW_DOWN:
if (config.cy != config.screenrows - 1) {
config.cy++;
}
break;
}
}
void process_key()
{
int c = read_key();
switch (c) {
case CTRL_KEY('q'):
write(STDOUT_FILENO, "\x1b[2J", 4);
write(STDOUT_FILENO, "\x1b[H", 3);
exit(0);
break;
case HOME_KEY:
config.cx = 0;
break;
case END_KEY:
config.cx = config.screencols - 1;
break;
case PAGE_UP:
case PAGE_DOWN:
{
int times = config.screenrows;
while (times--)
move_cursor(c == PAGE_UP ? ARROW_UP : ARROW_DOWN);
}
break;
case ARROW_UP:
case ARROW_DOWN:
case ARROW_LEFT:
case ARROW_RIGHT:
move_cursor(c);
break;
}
}
void init_editor()
{
config.cx = 0;
config.cy = 0;
if (get_window_size(&config.screenrows, &config.screencols) == -1)
die("get_window_size");
}
int main()
{
enable_raw_mode();
init_editor();
while (1) {
refresh_screen();
process_key();
}
return 0;
}