140 lines
2.6 KiB
C
140 lines
2.6 KiB
C
/*** includes ***/
|
|
|
|
#include <asm-generic/ioctls.h>
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/ioctl.h>
|
|
#include <termios.h>
|
|
#include <unistd.h>
|
|
|
|
/*** defines ***/
|
|
|
|
#define CTRL_KEY(k) ((k) & 0x1f)
|
|
|
|
/*** data ***/
|
|
|
|
struct editorConfig {
|
|
int screenrows;
|
|
int screencols;
|
|
struct termios orig_termios;
|
|
};
|
|
|
|
struct editorConfig E;
|
|
|
|
/*** terminal ***/
|
|
|
|
void die(const char* s) {
|
|
// Clear the whole screen.
|
|
write(STDOUT_FILENO, "\x1b[2J", 4);
|
|
// Move cursor to top left.
|
|
write(STDOUT_FILENO, "\x1b[H", 3);
|
|
|
|
perror(s);
|
|
exit(1);
|
|
}
|
|
|
|
void disableRawMode() {
|
|
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &E.orig_termios) == -1)
|
|
die("tcsetattr");
|
|
}
|
|
|
|
void enableRawMode() {
|
|
if (tcgetattr(STDIN_FILENO, &E.orig_termios) == -1)
|
|
die("tcgetattr");
|
|
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);
|
|
|
|
// Sets timeouts for read()
|
|
raw.c_cc[VMIN] = 0;
|
|
raw.c_cc[VTIME] = 1;
|
|
|
|
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1)
|
|
die("tcsetattr");
|
|
}
|
|
|
|
char editorReadKey() {
|
|
int nread;
|
|
char c;
|
|
while ((nread = read(STDIN_FILENO, &c, 1)) != 1) {
|
|
if (nread == -1 && errno != EAGAIN) {
|
|
die("read");
|
|
}
|
|
}
|
|
return c;
|
|
}
|
|
|
|
int getWindowSize(int *rows, int *cols) {
|
|
struct winsize ws;
|
|
|
|
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
|
|
return -1;
|
|
}
|
|
|
|
*rows = ws.ws_row;
|
|
*cols = ws.ws_col;
|
|
return 0;
|
|
}
|
|
|
|
/*** output ***/
|
|
|
|
void editorDrawRows() {
|
|
for (int y = 0; y < E.screenrows; y++) {
|
|
write(STDOUT_FILENO, "~\r\n", 3);
|
|
}
|
|
}
|
|
|
|
void editorRefreshScreen() {
|
|
// Clear the whole screen.
|
|
write(STDOUT_FILENO, "\x1b[2J", 4);
|
|
// Move cursor to top left.
|
|
write(STDOUT_FILENO, "\x1b[H", 3);
|
|
|
|
editorDrawRows();
|
|
|
|
write(STDOUT_FILENO, "\x1b[H", 3);
|
|
}
|
|
|
|
/*** input ***/
|
|
|
|
void editorProcessKeypress() {
|
|
char c = editorReadKey();
|
|
|
|
switch (c) {
|
|
case CTRL_KEY('q'):
|
|
// Clear the whole screen.
|
|
write(STDOUT_FILENO, "\x1b[2J", 4);
|
|
// Move cursor to top left.
|
|
write(STDOUT_FILENO, "\x1b[H", 3);
|
|
|
|
exit(0);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*** init ***/
|
|
|
|
void initEditor() {
|
|
if (getWindowSize(&E.screenrows, &E.screencols) == -1) {
|
|
die("getWindowSize");
|
|
}
|
|
}
|
|
|
|
int main() {
|
|
enableRawMode();
|
|
initEditor();
|
|
|
|
while(1) {
|
|
editorRefreshScreen();
|
|
editorProcessKeypress();
|
|
}
|
|
return 0;
|
|
}
|