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This commit is contained in:
Tyrel Souza 2021-10-20 23:37:39 -04:00
parent d9d2fc4a36
commit 271ab508da
1 changed files with 121 additions and 6 deletions
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125
kilo.c
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@ -9,9 +9,21 @@
#include <unistd.h>
/** defines ***/
#define KILO_VERSION "0.0.1"
#define TYREL_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
};
/*** data ***/
struct editorConfig {
@ -52,13 +64,66 @@ void enableRawMode() {
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) die("tcsetattr");
}
char editorReadKey() {
int editorReadKey() {
int nread;
char c;
while ((nread = read(STDIN_FILENO, &c, 1)) != 1) {
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 '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;
}
}
int getCursorPosition(int *rows, int *cols) {
@ -116,7 +181,7 @@ void editorDrawRows(struct abuf *ab) {
for (y = 0; y < E.screenrows; y++) {
if (y == E.screenrows / 3) {
char welcome[80];
int welcomelen = snprintf(welcome, sizeof welcome, "Kilo Editor -- version %s", KILO_VERSION);
int welcomelen = snprintf(welcome, sizeof welcome, "Tyrel Editor -- version %s", TYREL_VERSION);
int padding = (E.screencols - welcomelen) / 2;
if (padding) {
abAppend(ab, "~", 1);
@ -140,7 +205,10 @@ void editorRefreshScreen() {
abAppend(&ab, "\x1b[?25l", 6);
abAppend(&ab, "\x1b[H", 3); // Cursor Position home
editorDrawRows(&ab);
abAppend(&ab, "\x1b[H", 3); // Cursor Position home
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);
write(STDOUT_FILENO, ab.b, ab.len);
@ -149,14 +217,61 @@ void editorRefreshScreen() {
/*** input ***/
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:
if (E.cy != E.screenrows - 1) {
E.cy++;
}
break;
}
}
void editorProcessKeypress() {
char c = editorReadKey();
int c = editorReadKey();
switch (c) {
case CTRL_KEY('q'):
write(STDOUT_FILENO, "\x1b[2J", 4);
write(STDOUT_FILENO, "\x1b[H", 3);
exit(0);
break;
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;
}
}