hadeed/kilo
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Hadeed 2023-08-27 22:40:12 +05:00
parent 2d2de2aa14
commit 4111679e0d
2 changed files with 96 additions and 63 deletions
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3
README.md
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@ -4,9 +4,6 @@ Clone of the tiny text editor [kilo][1], written following a [tutorial][2]. Not
an exact copy of either, and I'm once done with the tutorial I may add more
features.
## TODO
- Improve the scrolling situation, make it consistent
## References
- [antirez/kilo][1]
- [Build Your Own Text Editor][2]

156
kilo.c
View file

@ -24,8 +24,10 @@ struct render_buf;
struct input_buf;
struct EROW {
char *s;
int size;
char *chars;
int n_chars;
char *render;
int rsize;
};
struct {
@ -65,13 +67,16 @@ typedef uint16_t KEY;
/*****************************************************************************/
void editor_init(void);
void editor_free(void);
void editor_open(char *);
void editor_redraw_screen(void);
void editor_process_key(void);
void editor_draw_rows(void);
void editor_append_row(const char *, int);
void editor_scroll(enum SCROLL_DIR, int);
void editor_free(void);
void editor_process_key(void);
void editor_move_cursor(KEY);
void editor_adjust_viewport(void);
struct render_buf *rb_init(void);
void rb_append(struct render_buf *, const char *, int);
@ -134,6 +139,11 @@ void editor_init() {
E.ib = ib_init(128);
}
void editor_free() {
term_clear();
ib_free(E.ib);
}
void editor_open(char *filename) {
FILE *file = fopen(filename, "r");
if (!file) die("fopen");
@ -153,6 +163,7 @@ void editor_open(char *filename) {
fclose(file);
}
void editor_redraw_screen() {
if (term_cursor_hidden(true) == -1) die("term_cursor_hidden");
@ -169,45 +180,6 @@ void editor_redraw_screen() {
die("term_cursor_hidden");
}
void editor_process_key() {
KEY c = ib_read(E.ib);
switch (c) {
case ARROW_LEFT:
E.cx = MAX(E.cx - 1, 0);
E.col_off = MIN(E.col_off, E.cx);
break;
case ARROW_DOWN:
E.cy = MIN(E.cy + 1, E.n_rows - 1);
E.row_off = MAX(E.row_off, E.cy - (E.screenrows - 1));
break;
case ARROW_UP:
E.cy = MAX(E.cy - 1, 0);
E.row_off = MIN(E.row_off, E.cy);
break;
case ARROW_RIGHT:
E.cx = MIN(E.cx + 1, INT_MAX);
E.col_off = MAX(E.col_off, E.cx - (E.screencols - 1));
break;
case HOME:
E.cx = E.col_off = 0;
break;
case END:
E.cx = E.screencols - 1;
break;
case PG_UP:
case PG_DOWN:
editor_scroll(c == PG_UP ? SCROLL_UP : SCROLL_DOWN, E.screenrows);
break;
case CTRL_KEY('Q'):
E.running = false;
break;
}
}
void editor_draw_rows() {
term_set_cursor_pos(1, 1);
@ -217,9 +189,9 @@ void editor_draw_rows() {
if (in_file) {
struct EROW curr_row = E.rows[y + E.row_off];
int max_len = MIN(curr_row.size - E.col_off, E.screencols);
int max_len = MIN(curr_row.n_chars - E.col_off, E.screencols);
rb_append(E.rb, curr_row.s + E.col_off, MAX(max_len, 0));
rb_append(E.rb, curr_row.chars + E.col_off, MAX(max_len, 0));
} else if (no_file && y == E.screenrows / 2) {
char welcome[64];
int len = snprintf(welcome, sizeof(welcome),
@ -241,28 +213,92 @@ void editor_draw_rows() {
void editor_append_row(const char *s, int len) {
E.rows = realloc(E.rows, sizeof(struct EROW) * (E.n_rows + 1));
E.rows[E.n_rows].s = malloc(len);
memcpy(E.rows[E.n_rows].s, s, len);
E.rows[E.n_rows].chars = malloc(len);
memcpy(E.rows[E.n_rows].chars, s, len);
E.rows[E.n_rows++].size = len;
E.rows[E.n_rows++].n_chars = len;
}
void editor_scroll(enum SCROLL_DIR dir, int num) {
switch (dir) {
case SCROLL_UP:
E.row_off = MAX(E.row_off - num, 0);
E.cy = MIN(E.cy, E.screenrows + E.row_off - 1);
void editor_process_key() {
KEY c = ib_read(E.ib);
switch (c) {
case ARROW_LEFT:
case ARROW_DOWN:
case ARROW_UP:
case ARROW_RIGHT:
case HOME:
case END:
case PG_UP:
case PG_DOWN:
editor_move_cursor(c);
editor_adjust_viewport();
break;
case SCROLL_DOWN:
E.row_off = MIN(E.row_off + num, E.n_rows - E.screenrows);
E.cy = MAX(E.cy, E.row_off);
case CTRL_KEY('Q'):
E.running = false;
break;
}
}
void editor_free() {
term_clear();
ib_free(E.ib);
void editor_move_cursor(KEY key) {
struct EROW *row = (E.cy < E.n_rows) ? E.rows + E.cy : NULL;
switch (key) {
case ARROW_LEFT:
if (E.cx > 0) E.cx--;
else if (E.cy > 0) E.cx = E.rows[--E.cy].n_chars;
break;
case ARROW_DOWN:
if (E.cy < E.n_rows) E.cy++;
break;
case ARROW_UP:
if (E.cy > 0) E.cy--;
break;
case ARROW_RIGHT:
if (E.cx < (row ? row->n_chars : 0)) E.cx++;
else if (E.cy < E.n_rows) {
E.cx = 0;
E.cy++;
}
break;
case HOME:
E.cx = 0;
break;
case END:
E.cx = row ? row->n_chars : 0;
break;
case PG_UP:
if ((E.cy -= E.screenrows) < 0)
E.cy = 0;
break;
case PG_DOWN:
if ((E.cy += E.screenrows) > E.n_rows)
E.cy = E.n_rows;
break;
}
// TODO: implement this vim style
row = (E.cy < E.n_rows) ? E.rows + E.cy : NULL;
if (E.cx > (row ? row->n_chars : 0))
E.cx = (row ? row->n_chars : 0);
}
void editor_adjust_viewport() {
if (E.row_off > E.cy)
E.row_off = E.cy;
if (E.col_off > E.cx)
E.col_off = E.cx;
if (E.row_off < E.cy - (E.screenrows - 1))
E.row_off = E.cy - (E.screenrows - 1);
if (E.col_off < E.cx - (E.screencols - 1))
E.col_off = E.cx - (E.screencols - 1);
}
/*****************************************************************************/