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This commit is contained in:
Benjamyn Love 2024-02-07 11:54:01 +11:00
parent f298b0b5fd
commit 420a188baa
1 changed files with 206 additions and 52 deletions
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244
kilo.c
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@ -15,9 +15,21 @@
#define CTRL_KEY(k) ((k) & 0x1f) #define CTRL_KEY(k) ((k) & 0x1f)
enum editorKey
{
ARROW_LEFT = 1000,
ARROW_RIGHT,
ARROW_UP,
ARROW_DOWN,
PAGE_UP,
PAGE_DOWN
};
/*** data ***/ /*** data ***/
struct editorConfig { struct editorConfig
{
int cx, cy;
int screenrows; int screenrows;
int screencols; int screencols;
struct termios orig_termios; struct termios orig_termios;
@ -27,7 +39,8 @@ struct editorConfig E;
/*** terminal ***/ /*** terminal ***/
void die(const char *s) { void die(const char *s)
{
write(STDOUT_FILENO, "\x1b[2J", 4); write(STDOUT_FILENO, "\x1b[2J", 4);
write(STDOUT_FILENO, "\x1b[H", 3); write(STDOUT_FILENO, "\x1b[H", 3);
@ -35,13 +48,16 @@ void die(const char *s) {
exit(1); exit(1);
} }
void disableRawMode() { void disableRawMode()
{
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &E.orig_termios) == 1) if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &E.orig_termios) == 1)
die("tcsetattr"); die("tcsetattr");
} }
void enableRawMode() { void enableRawMode()
if (tcgetattr(STDIN_FILENO, &E.orig_termios) == -1) die("tcgetattr"); {
if (tcgetattr(STDIN_FILENO, &E.orig_termios) == -1)
die("tcgetattr");
atexit(disableRawMode); atexit(disableRawMode);
struct termios raw = E.orig_termios; struct termios raw = E.orig_termios;
@ -53,45 +69,107 @@ void enableRawMode() {
raw.c_cc[VMIN] = 0; raw.c_cc[VMIN] = 0;
raw.c_cc[VTIME] = 1; raw.c_cc[VTIME] = 1;
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) die("tcsetattr"); if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1)
die("tcsetattr");
} }
char editorReadKey() { int editorReadKey()
{
int nread; int nread;
char c; char c;
while ((nread = read(STDIN_FILENO, &c, 1)) != 1) { while ((nread = read(STDIN_FILENO, &c, 1)) != 1)
if (nread == -1 && errno != EAGAIN) die("read"); {
if (nread == -1 && errno != EAGAIN)
die("read");
} }
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 '5':
return PAGE_UP;
case '6':
return PAGE_DOWN;
}
}
}
else
{
switch (seq[1])
{
case 'A':
return ARROW_UP;
case 'B':
return ARROW_DOWN;
case 'C':
return ARROW_RIGHT;
case 'D':
return ARROW_LEFT;
}
}
}
return '\x1b';
}
else
{
return c; return c;
}
} }
int getCursorPosition(int *rows, int *cols) { int getCursorPosition(int *rows, int *cols)
{
char buf[32]; char buf[32];
unsigned int i = 0; unsigned int i = 0;
if (write(STDOUT_FILENO, "\x1b[6n", 4) != 4) return -1; if (write(STDOUT_FILENO, "\x1b[6n", 4) != 4)
return -1;
while (i < sizeof(buf) - 1) { while (i < sizeof(buf) - 1)
if(read(STDIN_FILENO, &buf[i], 1) != 1) break; {
if(buf[i] == 'R') break; if (read(STDIN_FILENO, &buf[i], 1) != 1)
break;
if (buf[i] == 'R')
break;
i++; i++;
} }
buf[i] = '\0'; buf[i] = '\0';
if (buf[0] != '\x1b' || buf[1] != '[') return -1; if (buf[0] != '\x1b' || buf[1] != '[')
if (sscanf(&buf[2], "%d;%d", rows, cols) != 2) return -1; return -1;
if (sscanf(&buf[2], "%d;%d", rows, cols) != 2)
return -1;
return 0; return 0;
} }
int getWindowSize(int *rows, int *cols) { int getWindowSize(int *rows, int *cols)
{
struct winsize ws; struct winsize ws;
if (1 || ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) { if (1 || ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0)
if (write(STDOUT_FILENO, "\x1b[999C\x1b[999B", 12) != 12) return -1; {
// editorReadKey(); if (write(STDOUT_FILENO, "\x1b[999C\x1b[999B", 12) != 12)
return -1;
// editorReadKey();
return getCursorPosition(rows, cols); return getCursorPosition(rows, cols);
} else { }
else
{
*cols = ws.ws_col; *cols = ws.ws_col;
*rows = ws.ws_row; *rows = ws.ws_row;
return 0; return 0;
@ -100,95 +178,171 @@ int getWindowSize(int *rows, int *cols) {
/*** append buffer ***/ /*** append buffer ***/
struct abuf { struct abuf
{
char *b; char *b;
int len; int len;
}; };
#define ABUF_INIT {NULL, 0} #define ABUF_INIT \
{ \
NULL, 0 \
}
void abAppend(struct abuf *ab, const char *s, int len) { void abAppend(struct abuf *ab, const char *s, int len)
{
char *new = realloc(ab->b, ab->len + len); char *new = realloc(ab->b, ab->len + len);
if (new == NULL) return; if (new == NULL)
return;
memcpy(&new[ab->len], s, len); memcpy(&new[ab->len], s, len);
ab->b = new; ab->b = new;
ab->len += len; ab->len += len;
} }
void abFree(struct abuf *ab) { void abFree(struct abuf *ab)
{
free(ab->b); free(ab->b);
} }
/*** output ***/ /*** output ***/
void editorDrawRows(struct abuf *ab) { void editorDrawRows(struct abuf *ab)
{
int y; int y;
for (y = 0; y < E.screenrows; y++) { for (y = 0; y < E.screenrows; y++)
if (y == E.screenrows / 3) { {
if (y == E.screenrows / 3)
{
char welcome[80]; char welcome[80];
int welcomelen = snprintf(welcome, sizeof(welcome), int welcomelen = snprintf(welcome, sizeof(welcome),
"Kilo editor -- version %s", KILO_VERSION); "Kilo editor -- version %s", KILO_VERSION);
if (welcomelen > E.screencols) welcomelen = E.screencols; if (welcomelen > E.screencols)
welcomelen = E.screencols;
int padding = (E.screencols - welcomelen) / 2; int padding = (E.screencols - welcomelen) / 2;
if (padding) { if (padding)
{
abAppend(ab, "~", 1); abAppend(ab, "~", 1);
padding--; padding--;
} }
while (padding--) abAppend(ab, " ", 1); while (padding--)
abAppend(ab, " ", 1);
abAppend(ab, welcome, welcomelen); abAppend(ab, welcome, welcomelen);
} else { }
else
{
abAppend(ab, "~", 1); abAppend(ab, "~", 1);
} }
abAppend(ab, "\x1b[K", 3); abAppend(ab, "\x1b[K", 3);
if (y < E.screenrows - 1) { if (y < E.screenrows - 1)
{
abAppend(ab, "\r\n", 2); abAppend(ab, "\r\n", 2);
} }
} }
} }
void editorRefreshScreen() { void editorRefreshScreen()
{
struct abuf ab = ABUF_INIT; struct abuf ab = ABUF_INIT;
abAppend(&ab, "\x1b[?25l", 6); abAppend(&ab, "\x1b[?25l", 6);
abAppend(&ab, "\x1b[H" , 3); abAppend(&ab, "\x1b[H", 3);
editorDrawRows(&ab); editorDrawRows(&ab);
abAppend(&ab, "\x1b[H", 3); char buf[32];
snprintf(buf, sizeof(buf), "\x1b[%d;%dH", E.cy + 1, E.cx + 1);
abAppend(&ab, buf, strlen(buf));
abAppend(&ab, "\x1b[?25h", 6); abAppend(&ab, "\x1b[?25h", 6);
write(STDOUT_FILENO, ab.b, ab.len); write(STDOUT_FILENO, ab.b, ab.len);
abFree(&ab); abFree(&ab);
} }
/*** input ***/ /*** input ***/
void editorProcessKeypress() { void editorMoveCursor(int key)
char c = editorReadKey(); {
switch (key)
{
case ARROW_LEFT:
if (E.cx != 0)
{
E.cx--;
}
break;
case ARROW_RIGHT:
if (E.cx != E.screencols - 1)
{
E.cx++;
}
break;
switch (c) { case ARROW_UP:
if (E.cy != 0)
{
E.cy--;
}
break;
case ARROW_DOWN:
if (E.cy != E.screenrows - 1)
{
E.cy++;
}
break;
default:
break;
}
}
void editorProcessKeypress()
{
int c = editorReadKey();
switch (c)
{
case CTRL_KEY('q'): case CTRL_KEY('q'):
write(STDOUT_FILENO, "\x1b[2J", 4); write(STDOUT_FILENO, "\x1b[2J", 4);
write(STDOUT_FILENO, "\x1b[H", 3); write(STDOUT_FILENO, "\x1b[H", 3);
exit(0); exit(0);
break; 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;
} }
} }
/*** init ***/ /*** init ***/
void initEditor() { void initEditor()
if (getWindowSize(&E.screenrows, &E.screencols) == -1) die("getWindowSize"); {
E.cx = 0;
E.cy = 0;
if (getWindowSize(&E.screenrows, &E.screencols) == -1)
die("getWindowSize");
} }
int main() { int main()
{
enableRawMode(); enableRawMode();
initEditor(); initEditor();
while (1) { while (1)
{
editorRefreshScreen(); editorRefreshScreen();
editorProcessKeypress(); editorProcessKeypress();
} }