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Finish second part. Keys are recognized

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This commit is contained in:
Aaron Fischer 2018-09-17 13:27:19 +02:00
parent fbf0ef7678
commit 168a119064
1 changed files with 133 additions and 5 deletions
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138
kilo.c
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@ -10,11 +10,28 @@
#include <unistd.h>
/*** defines ***/
#define KILO_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 {
int cx, cy;
int screenrows;
int screencols;
struct termios orig_termios;
@ -53,13 +70,53 @@ void enableRawMode() {
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");
}
return c;
// Process escape sequences
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;
}
}
} else if (seq[0] == '0') {
switch (seq[1]) {
case 'H': return HOME_KEY;
case 'F': return END_KEY;
}
}
return '\x1b';
} else {
return c;
}
}
int getCursorPosition(int *rows, int *cols) {
@ -122,7 +179,21 @@ void abFree(struct abuf *ab) {
void editorDrawRows(struct abuf *ab) {
int y;
for (y = 0; y < E.screenrows; y++) {
abAppend(ab, "~", 1);
if (y == E.screenrows / 3) {
char welcome[80];
int welcomelen = snprintf(welcome, sizeof(welcome),
"Kilo editor -- version %s", KILO_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, "\x1b[K", 3); // Erase one line
if (y < E.screenrows - 1) {
@ -139,7 +210,11 @@ void editorRefreshScreen() {
editorDrawRows(&ab);
abAppend(&ab, "\x1b[H", 3);
// Update cursor position
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); // Show cursor
write(STDOUT_FILENO, ab.b, ab.len);
@ -148,8 +223,34 @@ 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(); // Blocking!
int c = editorReadKey(); // Blocking!
switch (c) {
case CTRL_KEY('q'):
@ -157,12 +258,39 @@ void editorProcessKeypress() {
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;
}
}
/*** init ***/
void initEditor() {
E.cx = 0;
E.cy = 0;
if (getWindowSize(&E.screenrows, &E.screencols) == -1)
die("getWindowSize");
}