Render tabs as spaces

This commit is contained in:
Timothy Warren 2019-08-19 15:19:16 -04:00
parent 36059938f6
commit c1f46771d7

90
kilo.c
View File

@ -17,6 +17,7 @@
/*** defines ***/
#define KILO_VERSION "0.0.1"
#define KILO_TAB_STOP 8
#define CTRL_KEY(k) ((k) & 0x1f)
@ -36,12 +37,15 @@ enum editorKey {
typedef struct erow {
int size;
int rsize;
char *chars;
char *render;
} erow;
struct editorConfig {
int cx, cy;
int rowoff;
int coloff;
int screenrows;
int screencols;
int numrows;
@ -231,6 +235,43 @@ int getWindowSize(int *rows, int *cols)
}
/*** row operations ***/
void editorUpdateRow(erow *row)
{
int tabs = 0;
int j;
for (j = 0; j < row->size; j++)
{
if (row->chars[j] == '\t')
{
tabs++;
}
}
free(row->render);
row->render = malloc(row->size + tabs*(KILO_TAB_STOP - 1) + 1);
int idx = 0;
for (j = 0; j < row->size; j++)
{
if (row->chars[j] == '\t')
{
row->render[idx++] = ' ';
while (idx % KILO_TAB_STOP != 0)
{
row->render[idx++] = ' ';
}
}
else
{
row->render[idx++] = row->chars[j];
}
}
row->render[idx] = '\0';
row->rsize = idx;
}
void editorAppendRow(char *s, size_t len)
{
E.row = realloc(E.row, sizeof(erow) * (E.numrows + 1));
@ -240,6 +281,11 @@ void editorAppendRow(char *s, size_t len)
E.row[at].chars = malloc(len + 1);
memcpy(E.row[at].chars, s, len);
E.row[at].chars[len] = '\0';
E.row[at].rsize = 0;
E.row[at].render = NULL;
editorUpdateRow(&E.row[at]);
E.numrows++;
}
@ -311,6 +357,16 @@ void editorScroll()
{
E.rowoff = E.cy - E.screenrows + 1;
}
if (E.cx < E.coloff)
{
E.coloff = E.cx;
}
if (E.cx >= E.coloff + E.screencols)
{
E.coloff = E.cx - E.screencols + 1;
}
}
void editorDrawRows(struct abuf *ab)
@ -353,13 +409,18 @@ void editorDrawRows(struct abuf *ab)
}
else
{
int len = E.row[filerow].size;
int len = E.row[filerow].rsize - E.coloff;
if (len < 0)
{
len = 0;
}
if (len > E.screencols)
{
len = E.screencols;
}
abAppend(ab, E.row[filerow].chars, len);
abAppend(ab, &E.row[filerow].render[E.coloff], len);
}
abAppend(ab, "\x1b[K", 3);
@ -382,7 +443,8 @@ void editorRefreshScreen()
editorDrawRows(&ab);
char buf[32];
snprintf(buf, sizeof(buf), "\x1b[%d;%dH", E.cy + 1, E.cx + 1);
snprintf(buf, sizeof(buf), "\x1b[%d;%dH",
(E.cy - E.rowoff) + 1, (E.cx - E.coloff) + 1);
abAppend(&ab, buf, strlen(buf));
abAppend(&ab, "\x1b[?25h", 6);
@ -395,6 +457,8 @@ void editorRefreshScreen()
void editorMoveCursor(int key)
{
erow *row = (E.cy >= E.numrows) ? NULL : &E.row[E.cy];
switch (key)
{
case ARROW_LEFT:
@ -402,13 +466,23 @@ void editorMoveCursor(int key)
{
E.cx--;
}
else if (E.cy > 0)
{
E.cy--;
E.cx = E.row[E.cy].size;
}
break;
case ARROW_RIGHT:
if (E.cx != E.screencols - 1)
if (row && E.cx < row->size)
{
E.cx++;
}
else if (row && E.cx == row->size)
{
E.cy++;
E.cx = 0;
}
break;
case ARROW_UP:
@ -425,6 +499,13 @@ void editorMoveCursor(int key)
}
break;
}
row = (E.cy >= E.numrows) ? NULL : &E.row[E.cy];
int rowlen = row ? row->size : 0;
if (E.cx > rowlen)
{
E.cx = rowlen;
}
}
void editorProcessKeypress()
@ -473,6 +554,7 @@ void initEditor()
E.cx = 0;
E.cy = 0;
E.rowoff = 0;
E.coloff = 0;
E.numrows = 0;
E.row = NULL;