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sloumdrone 2019-12-27 22:26:00 -08:00
commit c88b19a4da
3 changed files with 311 additions and 0 deletions

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Makefile Normal file
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csedit: csedit.c
$(CC) csedit.c -o csedit -Wall -Wextra -pedantic -std=c99

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csedit Executable file

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//
// includes
// --------
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <unistd.h>
//
// definitions
// -----------
#define CSEDIT_VERSION "0.0.1"
#define CTRL_KEY(k) ((k) & 0x1f)
enum editorMode {CommandMode, InputMode, VisualMode};
enum editorKey {
ARROW_LEFT = 1000,
ARROW_RIGHT,
ARROW_UP,
ARROW_DOWN,
PAGE_UP,
PAGE_DOWN,
DELETE,
BACKSPACE
};
//
// data
// ----
struct editorConfig {
struct termios orig_termios;
enum editorMode mode;
int cx, cy;
int screenRows;
int screenCols;
};
struct editorConfig E;
//
// terminal
// --------
void die(const char *s) {
write(STDOUT_FILENO, "\033[2J", 4);
write(STDOUT_FILENO, "\033[H", 3);
perror(s);
write(STDOUT_FILENO, "\r", 1);
exit(1);
}
void quit() {
write(STDOUT_FILENO, "\033[2J", 4);
write(STDOUT_FILENO, "\033[H", 3);
exit(0);
}
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);
raw.c_cc[VMIN] = 0;
raw.c_cc[VTIME] = 1;
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) die("tcsetattr");
}
int editorReadKey() {
int nread;
char c;
while ((nread = read(STDIN_FILENO, &c, 1)) != 1) {
if (nread == -1 && errno != EAGAIN) die("read");
}
if (c == '\033') {
char seq[3];
if (read(STDIN_FILENO, &seq[0], 1) != 1) return '\033';
if (read(STDIN_FILENO, &seq[1], 1) != 1) return '\033';
if (seq[0] == '[') {
switch (seq[1]) {
case 'A': return ARROW_UP;
case 'B': return ARROW_DOWN;
case 'C': return ARROW_RIGHT;
case 'D': return ARROW_LEFT;
}
}
return '\033';
}
return c;
}
int getCursorPosition(int *rows, int *cols) {
char buf[32];
unsigned int i = 0;
if (write(STDOUT_FILENO, "\033[6n", 4) != 4) return -1;
printf("\r\n");
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] != '\033' || buf[1] != '[') return -1;
if (scanf(&buf[2], "%d;%d", rows, cols) != 2) return -1;
return 0;
}
int getWindowSize(int *rows, int *cols) {
struct winsize ws;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
if (write(STDOUT_FILENO, "\033[999C\033[999B", 12) != 12) return -1;
return getCursorPosition(rows, cols);
}
*cols = ws.ws_col;
*rows = ws.ws_row;
return 0;
}
//
// append buffer
// -------------
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);
}
//
// output
// ------
void editorDrawRows(struct abuf *ab) {
int y;
for (y = 0; y < E.screenRows; y++) {
if (y == E.screenRows / 3) {
char welcome[80];
int welcomelen = snprintf(welcome, sizeof(welcome), "[ cs edit ] - version %s", CSEDIT_VERSION);
if (welcomelen > E.screenCols) welcomelen = E.screenCols;
int padding = (E.screenCols - welcomelen) / 2;
if (padding) {
abAppend(ab, "~", 1);
padding--;
}
while (padding--) abAppend(ab, " ", 1);
abAppend(ab, welcome, welcomelen);
} else {
abAppend(ab, "~", 1);
}
abAppend(ab, "\033[K", 3);
if (y < E.screenRows - 1) {
abAppend(ab, "\r\n", 2);
}
}
}
void editorRefreshScreen() {
struct abuf ab = ABUF_INIT;
abAppend(&ab, "\033[?25l", 6);
abAppend(&ab, "\033[H", 3);
editorDrawRows(&ab);
char buf[32];
snprintf(buf, sizeof(buf), "\033[%d;%dH", E.cy + 1, E.cx + 1);
abAppend(&ab, buf, strlen(buf));
abAppend(&ab, "\033[?25h", 6);
write(STDOUT_FILENO, ab.b, ab.len);
abFree(&ab);
}
//
// input
// -----
void editorMoveCursor(int key) {
switch (key) {
case 'j':
case ARROW_DOWN:
if (E.cy != E.screenRows - 1) {
E.cy++;
}
break;
case 'k':
case ARROW_UP:
if (E.cy != 0) {
E.cy--;
}
break;
case 'h':
case ARROW_LEFT:
if (E.cx != 0) {
E.cx--;
}
break;
case 'l':
case ARROW_RIGHT:
if (E.cx != E.screenCols - 1) {
E.cx++;
}
break;
}
}
void editorInputKp(int c) {
switch (c) {
case ARROW_DOWN:
case ARROW_UP:
case ARROW_LEFT:
case ARROW_RIGHT:
editorMoveCursor(c);
break;
case '\033':
E.mode = CommandMode;
default:
break;
}
}
void editorCommandKp(int c) {
switch (c) {
case 'q':
quit();
break;
case 'j':
case 'k':
case 'h':
case 'l':
case ARROW_DOWN:
case ARROW_UP:
case ARROW_LEFT:
case ARROW_RIGHT:
editorMoveCursor(c);
break;
case 'i':
E.mode = InputMode;
}
}
void editorProcessKeypress() {
int c = editorReadKey();
switch (c) {
case CTRL_KEY('q'):
quit();
break;
}
if (E.mode == CommandMode) {
editorCommandKp(c);
} else {
editorInputKp(c);
}
}
//
// init
// ----
void initEditor() {
E.mode = CommandMode;
E.cx = 0;
E.cy = 0;
if (getWindowSize(&E.screenRows, &E.screenCols) == -1) die("getWindowSize");
}
int main() {
enableRawMode();
initEditor();
while (1) {
editorRefreshScreen();
editorProcessKeypress();
}
return 0;
}