2019 lines
36 KiB
C
2019 lines
36 KiB
C
/*
|
||
* kyle's editor
|
||
*
|
||
* first version is a run-through of the kilo editor walkthrough as a
|
||
* set of guiderails. I've made a lot of changes and did some things
|
||
* differently. keep an eye for for kte, kyle's text editor - the
|
||
* rewrite that will be coming out... when it comes out.
|
||
*
|
||
* https://viewsourcecode.org/snaptoken/kilo/
|
||
*/
|
||
#include <sys/ioctl.h>
|
||
|
||
#include <assert.h>
|
||
#include <ctype.h>
|
||
#include <errno.h>
|
||
#include <fcntl.h>
|
||
#include <stdarg.h>
|
||
#include <stdint.h>
|
||
#include <stdio.h>
|
||
#include <stdlib.h>
|
||
#include <string.h>
|
||
#include <locale.h>
|
||
#include <wchar.h>
|
||
#include <termios.h>
|
||
#include <time.h>
|
||
#include <unistd.h>
|
||
|
||
|
||
#ifndef KE_VERSION
|
||
#define KE_VERSION "ke dev build"
|
||
#endif
|
||
|
||
#define ESCSEQ "\x1b["
|
||
#define CTRL_KEY(key) ((key)&0x1f)
|
||
#define TAB_STOP 8
|
||
#define MSG_TIMEO 3
|
||
|
||
/*
|
||
* define the keyboard input modes
|
||
* normal: no special mode
|
||
* kcommand: ^k commands
|
||
* escape: what happens when you hit escape?
|
||
*/
|
||
#define MODE_NORMAL 0
|
||
#define MODE_KCOMMAND 1
|
||
#define MODE_ESCAPE 2
|
||
|
||
|
||
#define TAB_STOP 8
|
||
|
||
|
||
#define INITIAL_CAPACITY 64
|
||
|
||
|
||
#define KILLRING_NO_OP 0 /* don't touch the killring */
|
||
#define KILLRING_APPEND 1 /* append deleted chars */
|
||
#define KILLRING_PREPEND 2 /* prepend deleted chars */
|
||
#define KILLING_SET 3 /* set killring to deleted char */
|
||
#define KILLRING_FLUSH 4 /* clear the killring */
|
||
|
||
int
|
||
next_power_of_2(int n)
|
||
{
|
||
if (n < 2) {
|
||
n = 2;
|
||
}
|
||
|
||
n--;
|
||
n |= n >> 1;
|
||
n |= n >> 2;
|
||
n |= n >> 4;
|
||
n |= n >> 8;
|
||
n |= n >> 16;
|
||
|
||
return n + 1;
|
||
}
|
||
|
||
|
||
int
|
||
cap_growth(int cap, int sz)
|
||
{
|
||
if (cap == 0) {
|
||
cap = INITIAL_CAPACITY;
|
||
}
|
||
|
||
while (cap <= sz) {
|
||
cap = next_power_of_2(cap + 1);
|
||
}
|
||
|
||
return cap;
|
||
}
|
||
|
||
|
||
/*
|
||
* Function and struct declarations.
|
||
*/
|
||
|
||
/* append buffer */
|
||
struct abuf {
|
||
char *b;
|
||
int len;
|
||
int cap;
|
||
};
|
||
#define ABUF_INIT {NULL, 0, 0}
|
||
|
||
void ab_append(struct abuf *buf, const char *s, int len);
|
||
void ab_free(struct abuf *buf);
|
||
|
||
|
||
/* editor row */
|
||
struct erow {
|
||
char *line;
|
||
char *render;
|
||
|
||
int size;
|
||
int rsize;
|
||
|
||
int cap;
|
||
};
|
||
|
||
char nibble_to_hex(char c);
|
||
int erow_render_to_cursor(struct erow *row, int cx);
|
||
int erow_cursor_to_render(struct erow *row, int rx);
|
||
void erow_update(struct erow *row);
|
||
int erow_init(struct erow *row, int len);
|
||
void erow_insert(int at, char *s, int len);
|
||
void erow_free(struct erow *row);
|
||
void editor_set_status(const char *fmt, ...);
|
||
|
||
/* miscellaneous */
|
||
void die(const char *s);
|
||
int get_winsz(int *rows, int *cols);
|
||
void goto_line(void);
|
||
int cursor_at_eol(void);
|
||
void find_next_word(void);
|
||
void delete_next_word(void);
|
||
void find_prev_word(void);
|
||
void delete_prev_word(void);
|
||
void delete_row(int at);
|
||
void killring_start_with_char(unsigned char ch);
|
||
void killring_append_char(unsigned char ch);
|
||
void killring_prepend_char(unsigned char ch);
|
||
void killring_flush(void);
|
||
void killring_yank(void);
|
||
void row_append_row(struct erow *row, char *s, int len);
|
||
void row_insert_ch(struct erow *row, int at, int16_t c);
|
||
void row_delete_ch(struct erow *row, int at);
|
||
void insertch(int16_t c);
|
||
void deletech(uint8_t op);
|
||
void open_file(const char *filename);
|
||
char *rows_to_buffer(int *buflen);
|
||
int save_file(void);
|
||
uint16_t is_arrow_key(int16_t c);
|
||
int16_t get_keypress(void);
|
||
void display_refresh(void);
|
||
void editor_find_callback(char *query, int16_t c);
|
||
void editor_find(void);
|
||
char *editor_prompt(char *, void (*cb)(char *, int16_t));
|
||
void editor_openfile(void);
|
||
void move_cursor(int16_t c);
|
||
void newline(void);
|
||
void process_kcommand(int16_t c);
|
||
void process_normal(int16_t c);
|
||
void process_escape(int16_t c);
|
||
int process_keypress(void);
|
||
void enable_termraw(void);
|
||
void display_clear(struct abuf *ab);
|
||
void disable_termraw(void);
|
||
void setup_terminal(void);
|
||
void draw_rows(struct abuf *ab);
|
||
char status_mode_char(void);
|
||
void draw_status_bar(struct abuf *ab);
|
||
void draw_message_line(struct abuf *ab);
|
||
void scroll(void);
|
||
void display_refresh(void);
|
||
void editor_set_status(const char *fmt, ...);
|
||
void loop(void);
|
||
void init_editor(void);
|
||
void process_normal(int16_t c);
|
||
|
||
|
||
enum KeyPress {
|
||
TAB_KEY = 9,
|
||
ESC_KEY = 27,
|
||
BACKSPACE = 127,
|
||
ARROW_LEFT = 1000,
|
||
ARROW_RIGHT,
|
||
ARROW_UP,
|
||
ARROW_DOWN,
|
||
DEL_KEY,
|
||
HOME_KEY,
|
||
END_KEY,
|
||
PG_UP,
|
||
PG_DN,
|
||
};
|
||
|
||
|
||
/*
|
||
* editor is the global editor state; it should be broken out
|
||
* to buffers and screen state, probably.
|
||
*/
|
||
struct editor_t {
|
||
struct termios entry_term;
|
||
int rows, cols;
|
||
int curx, cury;
|
||
int rx;
|
||
int mode;
|
||
int nrows;
|
||
int rowoffs, coloffs;
|
||
struct erow *row;
|
||
struct erow *killring;
|
||
int killing; /* are we in a contiguous delete sequence? */
|
||
int suppress_killrow; /* internal flag: don't add to killring inside delete_row */
|
||
char *filename;
|
||
int dirty;
|
||
int dirtyex;
|
||
char msg[80];
|
||
time_t msgtm;
|
||
} editor = {
|
||
.cols = 0,
|
||
.rows = 0,
|
||
.curx = 0,
|
||
.cury = 0,
|
||
.mode = 0,
|
||
.nrows = 0,
|
||
.rowoffs = 0,
|
||
.coloffs = 0,
|
||
.row = NULL,
|
||
.killring = NULL,
|
||
.killing = 0,
|
||
.suppress_killrow = 0,
|
||
.filename = NULL,
|
||
.dirty = 0,
|
||
.dirtyex = 0,
|
||
};
|
||
|
||
|
||
/*
|
||
* init_editor should set up the global editor struct.
|
||
*/
|
||
void
|
||
init_editor(void)
|
||
{
|
||
editor.cols = 0;
|
||
editor.rows = 0;
|
||
|
||
if (get_winsz(&editor.rows, &editor.cols) == -1) {
|
||
die("can't get window size");
|
||
}
|
||
editor.rows--; /* status bar */
|
||
editor.rows--; /* message line */
|
||
|
||
editor.curx = editor.cury = 0;
|
||
editor.rx = 0;
|
||
|
||
editor.nrows = 0;
|
||
editor.rowoffs = editor.coloffs = 0;
|
||
editor.row = NULL;
|
||
editor.killring = NULL;
|
||
editor.killing = 0;
|
||
editor.suppress_killrow = 0;
|
||
|
||
editor.msg[0] = '\0';
|
||
editor.msgtm = 0;
|
||
|
||
editor.dirty = 0;
|
||
}
|
||
|
||
|
||
|
||
/*
|
||
* reset_editor presumes that editor has been initialized.
|
||
*/
|
||
void
|
||
reset_editor(void)
|
||
{
|
||
for (int i = 0; i < editor.nrows; i++) {
|
||
erow_free(&editor.row[i]);
|
||
}
|
||
free(editor.row);
|
||
|
||
if (editor.filename != NULL) {
|
||
free(editor.filename);
|
||
editor.filename = NULL;
|
||
}
|
||
|
||
if (editor.killring != NULL) {
|
||
erow_free(editor.killring);
|
||
free(editor.killring);
|
||
editor.killring = NULL;
|
||
}
|
||
|
||
init_editor();
|
||
}
|
||
|
||
|
||
void
|
||
ab_append(struct abuf *buf, const char *s, int len)
|
||
{
|
||
char *nc = buf->b;
|
||
int sz = buf->len + len;
|
||
|
||
if (sz >= buf->cap) {
|
||
while (sz > buf->cap) {
|
||
if (buf->cap == 0) {
|
||
buf->cap = 1;
|
||
} else {
|
||
buf->cap *= 2;
|
||
}
|
||
}
|
||
nc = realloc(nc, buf->cap);
|
||
assert(nc != NULL);
|
||
}
|
||
|
||
memcpy(&nc[buf->len], s, len);
|
||
buf->b = nc;
|
||
buf->len += len; /* DANGER: overflow */
|
||
}
|
||
|
||
|
||
void
|
||
ab_free(struct abuf *buf)
|
||
{
|
||
free(buf->b);
|
||
buf->b = NULL;
|
||
buf->len = 0;
|
||
buf->cap = 0;
|
||
}
|
||
|
||
char
|
||
nibble_to_hex(char c)
|
||
{
|
||
c &= 0xf;
|
||
if (c < 10) {
|
||
return (char)('0' + c);
|
||
}
|
||
return (char)('A' + (c - 10));
|
||
}
|
||
|
||
|
||
int
|
||
erow_render_to_cursor(struct erow *row, int cx)
|
||
{
|
||
int rx = 0;
|
||
size_t j = 0;
|
||
|
||
wchar_t wc;
|
||
mbstate_t st;
|
||
|
||
memset(&st, 0, sizeof(st));
|
||
|
||
while (j < (size_t)cx && j < (size_t)row->size) {
|
||
unsigned char b = (unsigned char)row->line[j];
|
||
if (b == '\t') {
|
||
rx += (TAB_STOP - 1) - (rx % TAB_STOP);
|
||
rx++;
|
||
j++;
|
||
continue;
|
||
}
|
||
if (b < 0x20) {
|
||
/* render as \xx -> width 3 */
|
||
rx += 3;
|
||
j++;
|
||
continue;
|
||
}
|
||
|
||
size_t rem = (size_t)row->size - j;
|
||
size_t n = mbrtowc(&wc, &row->line[j], rem, &st);
|
||
|
||
if (n == (size_t)-2) {
|
||
/* incomplete sequence at end; treat one byte */
|
||
rx += 1;
|
||
j += 1;
|
||
memset(&st, 0, sizeof(st));
|
||
}
|
||
else if (n == (size_t)-1) {
|
||
/* invalid byte; consume one and reset state */
|
||
rx += 1;
|
||
j += 1;
|
||
memset(&st, 0, sizeof(st));
|
||
}
|
||
else if (n == 0) {
|
||
/* null character */
|
||
rx += 0;
|
||
j += 1;
|
||
}
|
||
else {
|
||
int w = wcwidth(wc);
|
||
if (w < 0) w = 1; /* non-printable -> treat as width 1 */
|
||
rx += w;
|
||
j += n;
|
||
}
|
||
}
|
||
|
||
return rx;
|
||
}
|
||
|
||
|
||
int
|
||
erow_cursor_to_render(struct erow *row, int rx)
|
||
{
|
||
int cur_rx = 0;
|
||
size_t j = 0;
|
||
|
||
wchar_t wc;
|
||
mbstate_t st;
|
||
|
||
memset(&st, 0, sizeof(st));
|
||
|
||
while (j < (size_t)row->size) {
|
||
int w = 0;
|
||
size_t adv = 1;
|
||
|
||
unsigned char b = (unsigned char)row->line[j];
|
||
if (b == '\t') {
|
||
int add = (TAB_STOP - 1) - (cur_rx % TAB_STOP);
|
||
w = add + 1;
|
||
adv = 1;
|
||
/* tabs are single byte */
|
||
}
|
||
else if (b < 0x20) {
|
||
w = 3; /* "\\xx" */
|
||
adv = 1;
|
||
}
|
||
else {
|
||
size_t rem = (size_t)row->size - j;
|
||
size_t n = mbrtowc(&wc, &row->line[j], rem, &st);
|
||
|
||
if (n == (size_t)-2 || n == (size_t)-1) {
|
||
/* invalid/incomplete */
|
||
w = 1;
|
||
adv = 1;
|
||
memset(&st, 0, sizeof(st));
|
||
}
|
||
else if (n == 0) {
|
||
w = 0;
|
||
adv = 1;
|
||
}
|
||
else {
|
||
int ww = wcwidth(wc);
|
||
if (ww < 0) ww = 1;
|
||
w = ww;
|
||
adv = n;
|
||
}
|
||
}
|
||
|
||
if (cur_rx + w > rx) {
|
||
break;
|
||
}
|
||
|
||
cur_rx += w;
|
||
j += adv;
|
||
}
|
||
|
||
return (int)j;
|
||
}
|
||
|
||
|
||
void
|
||
erow_update(struct erow *row)
|
||
{
|
||
int i = 0, j;
|
||
int tabs = 0;
|
||
int ctrl = 0;
|
||
|
||
/*
|
||
* TODO(kyle): I'm not thrilled with this double-render.
|
||
*/
|
||
for (j = 0; j < row->size; j++) {
|
||
if (row->line[j] == '\t') {
|
||
tabs++;
|
||
}
|
||
else if ((unsigned char)row->line[j] < 0x20) {
|
||
/* treat only ASCII control characters as non-printable */
|
||
ctrl++;
|
||
}
|
||
}
|
||
|
||
if (row->rsize || row->render != NULL) {
|
||
free(row->render);
|
||
row->rsize = 0;
|
||
}
|
||
row->render = NULL;
|
||
row->render = malloc(row->size + (tabs * (TAB_STOP - 1)) + (ctrl * 3) + 1);
|
||
assert(row->render != NULL);
|
||
|
||
for (j = 0; j < row->size; j++) {
|
||
if (row->line[j] == '\t') {
|
||
do {
|
||
row->render[i++] = ' ';
|
||
}
|
||
while ((i % TAB_STOP) != 0);
|
||
}
|
||
else if ((unsigned char)row->line[j] < 0x20) {
|
||
row->render[i++] = '\\';
|
||
row->render[i++] = nibble_to_hex(row->line[j] >> 4);
|
||
row->render[i++] = nibble_to_hex(row->line[j] & 0x0f);
|
||
}
|
||
else {
|
||
/* leave UTF-8 multibyte bytes untouched so terminal can render */
|
||
row->render[i++] = row->line[j];
|
||
}
|
||
}
|
||
|
||
row->render[i] = '\0';
|
||
row->rsize = i;
|
||
}
|
||
|
||
|
||
int
|
||
erow_init(struct erow *row, int len)
|
||
{
|
||
row->size = len;
|
||
row->rsize = 0;
|
||
row->render = NULL;
|
||
row->line = NULL;
|
||
row->cap = cap_growth(0, len);
|
||
|
||
row->line = malloc(row->cap);
|
||
assert(row->line != NULL);
|
||
if (row->line == NULL) {
|
||
return -1;
|
||
}
|
||
|
||
row->line[len] = '\0';
|
||
return 0;
|
||
}
|
||
|
||
|
||
void
|
||
erow_insert(int at, char *s, int len)
|
||
{
|
||
struct erow row;
|
||
|
||
if (at < 0 || at > editor.nrows) {
|
||
return;
|
||
}
|
||
|
||
assert(erow_init(&row, len) == 0);
|
||
memcpy(row.line, s, len);
|
||
row.line[len] = 0;
|
||
|
||
editor.row = realloc(editor.row, sizeof(struct erow) * (editor.nrows + 1));
|
||
assert(editor.row != NULL);
|
||
|
||
if (at < editor.nrows) {
|
||
memmove(&editor.row[at+1], &editor.row[at],
|
||
sizeof(struct erow) * (editor.nrows - at));
|
||
}
|
||
|
||
editor.row[at] = row;
|
||
erow_update(&editor.row[at]);
|
||
editor.nrows++;
|
||
}
|
||
|
||
|
||
void
|
||
killring_flush(void)
|
||
{
|
||
if (editor.killring != NULL) {
|
||
erow_free(editor.killring);
|
||
free(editor.killring);
|
||
editor.killring = NULL;
|
||
}
|
||
}
|
||
|
||
|
||
void
|
||
killring_yank(void)
|
||
{
|
||
if (editor.killring == NULL) {
|
||
return;
|
||
}
|
||
/*
|
||
* Insert killring contents at the cursor without clearing the ring.
|
||
* Interpret '\n' as an actual newline() rather than inserting a raw 0x0A
|
||
* byte, so yanked content preserves lines correctly.
|
||
*/
|
||
for (int i = 0; i < editor.killring->size; i++) {
|
||
unsigned char ch = (unsigned char)editor.killring->line[i];
|
||
if (ch == '\n') {
|
||
newline();
|
||
}
|
||
else {
|
||
insertch(ch);
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
void
|
||
killring_start_with_char(unsigned char ch)
|
||
{
|
||
struct erow *row = NULL;
|
||
|
||
if (editor.killring != NULL) {
|
||
erow_free(editor.killring);
|
||
free(editor.killring);
|
||
editor.killring = NULL;
|
||
}
|
||
|
||
editor.killring = malloc(sizeof(struct erow));
|
||
assert(editor.killring != NULL);
|
||
assert(erow_init(editor.killring, 0) == 0);
|
||
|
||
/* append one char to empty killring without affecting editor.dirty */
|
||
row = editor.killring;
|
||
|
||
row->line = realloc(row->line, row->size + 2);
|
||
assert(row->line != NULL);
|
||
row->line[row->size] = ch;
|
||
row->size++;
|
||
row->line[row->size] = '\0';
|
||
erow_update(row);
|
||
}
|
||
|
||
|
||
void
|
||
killring_append_char(unsigned char ch)
|
||
{
|
||
struct erow *row = NULL;
|
||
|
||
if (editor.killring == NULL) {
|
||
killring_start_with_char(ch);
|
||
return;
|
||
}
|
||
|
||
row = editor.killring;
|
||
row->line = realloc(row->line, row->size + 2);
|
||
assert(row->line != NULL);
|
||
row->line[row->size] = ch;
|
||
row->size++;
|
||
row->line[row->size] = '\0';
|
||
erow_update(row);
|
||
}
|
||
|
||
|
||
void
|
||
killring_prepend_char(unsigned char ch)
|
||
{
|
||
if (editor.killring == NULL) {
|
||
killring_start_with_char(ch);
|
||
return;
|
||
}
|
||
|
||
struct erow* row = editor.killring;
|
||
row->line = realloc(row->line, row->size + 2);
|
||
assert(row->line != NULL);
|
||
memmove(&row->line[1], &row->line[0], row->size + 1);
|
||
row->line[0] = ch;
|
||
row->size++;
|
||
erow_update(row);
|
||
}
|
||
|
||
|
||
void
|
||
erow_free(struct erow *row)
|
||
{
|
||
free(row->render);
|
||
free(row->line);
|
||
row->render = NULL;
|
||
row->line = NULL;
|
||
}
|
||
|
||
|
||
void
|
||
die(const char *s)
|
||
{
|
||
/*
|
||
* NOTE(kyle): this is a duplication of the code in display.c
|
||
* but I would like to be able to import these files from there.
|
||
*/
|
||
write(STDOUT_FILENO, "\x1b[2J", 4);
|
||
write(STDOUT_FILENO, "\x1b[H", 3);
|
||
|
||
perror(s);
|
||
exit(1);
|
||
}
|
||
|
||
|
||
|
||
/*
|
||
* get_winsz uses the TIOCGWINSZ to get the window size.
|
||
*
|
||
* there's a fallback way to do this, too, that involves moving the
|
||
* cursor down and to the left \x1b[999C\x1b[999B. I'm going to skip
|
||
* on this for now because it's bloaty and this works on OpenBSD and
|
||
* Linux, at least.
|
||
*/
|
||
int
|
||
get_winsz(int *rows, int *cols)
|
||
{
|
||
struct winsize ws;
|
||
|
||
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 ||
|
||
ws.ws_col == 0) {
|
||
return -1;
|
||
}
|
||
|
||
*cols = ws.ws_col;
|
||
*rows = ws.ws_row;
|
||
return 0;
|
||
}
|
||
|
||
|
||
void
|
||
goto_line(void)
|
||
{
|
||
int lineno = 0;
|
||
char *query = editor_prompt("Line: %s", NULL);
|
||
|
||
if (query == NULL) {
|
||
return;
|
||
}
|
||
|
||
lineno = atoi(query);
|
||
if (lineno < 1 || lineno >= editor.nrows) {
|
||
editor_set_status("Line number must be between 1 and %d.", editor.nrows);
|
||
return;
|
||
}
|
||
|
||
editor.cury = lineno - 1;
|
||
editor.rowoffs = editor.cury - (editor.rows / 2);
|
||
}
|
||
|
||
|
||
int
|
||
cursor_at_eol(void)
|
||
{
|
||
assert(editor.curx >= 0);
|
||
assert(editor.cury >= 0);
|
||
assert(editor.cury <= editor.nrows);
|
||
assert(editor.curx <= editor.row[editor.cury].size);
|
||
|
||
return editor.curx == editor.row[editor.cury].size;
|
||
}
|
||
|
||
|
||
void
|
||
find_next_word(void)
|
||
{
|
||
while (cursor_at_eol()) {
|
||
move_cursor(ARROW_RIGHT);
|
||
}
|
||
|
||
if (isalnum(editor.row[editor.cury].line[editor.curx])) {
|
||
while (!isspace(editor.row[editor.cury].line[editor.curx]) && !cursor_at_eol()) {
|
||
move_cursor(ARROW_RIGHT);
|
||
}
|
||
|
||
return;
|
||
}
|
||
|
||
if (isspace(editor.row[editor.cury].line[editor.curx])) {
|
||
while (isspace(editor.row[editor.cury].line[editor.curx])) {
|
||
move_cursor(ARROW_RIGHT);
|
||
}
|
||
|
||
find_next_word();
|
||
}
|
||
}
|
||
|
||
|
||
void
|
||
delete_next_word(void)
|
||
{
|
||
while (cursor_at_eol()) {
|
||
move_cursor(ARROW_RIGHT);
|
||
deletech(KILLRING_APPEND);
|
||
}
|
||
|
||
if (isalnum(editor.row[editor.cury].line[editor.curx])) {
|
||
while (!isspace(editor.row[editor.cury].line[editor.curx]) && !cursor_at_eol()) {
|
||
move_cursor(ARROW_RIGHT);
|
||
deletech(KILLRING_APPEND);
|
||
}
|
||
|
||
return;
|
||
}
|
||
|
||
if (isspace(editor.row[editor.cury].line[editor.curx])) {
|
||
while (isspace(editor.row[editor.cury].line[editor.curx])) {
|
||
move_cursor(ARROW_RIGHT);
|
||
deletech(KILLRING_APPEND);
|
||
}
|
||
|
||
delete_next_word();
|
||
}
|
||
}
|
||
|
||
|
||
void
|
||
find_prev_word(void)
|
||
{
|
||
if (editor.cury == 0 && editor.curx == 0) {
|
||
return;
|
||
}
|
||
|
||
move_cursor(ARROW_LEFT);
|
||
|
||
while (cursor_at_eol() || isspace(editor.row[editor.cury].line[editor.curx])) {
|
||
if (editor.cury == 0 && editor.curx == 0) {
|
||
return;
|
||
}
|
||
|
||
move_cursor(ARROW_LEFT);
|
||
}
|
||
|
||
while (editor.curx > 0 && !isspace(editor.row[editor.cury].line[editor.curx - 1])) {
|
||
move_cursor(ARROW_LEFT);
|
||
}
|
||
}
|
||
|
||
void
|
||
delete_prev_word(void)
|
||
{
|
||
if (editor.cury == 0 && editor.curx == 0) {
|
||
return;
|
||
}
|
||
|
||
deletech(KILLRING_PREPEND);
|
||
|
||
while (editor.cury > 0 || editor.curx > 0) {
|
||
if (editor.curx == 0) {
|
||
deletech(KILLRING_PREPEND);
|
||
continue
|
||
}
|
||
|
||
if (!isspace(editor.row[editor.cury].line[editor.curx - 1])) {
|
||
break;
|
||
}
|
||
|
||
deletech(KILLRING_PREPEND);
|
||
}
|
||
|
||
while (editor.curx > 0) {
|
||
if (isspace(editor.row[editor.cury].line[editor.curx - 1])) {
|
||
break;
|
||
}
|
||
deletech(KILLRING_PREPEND);
|
||
}
|
||
}
|
||
|
||
void
|
||
delete_row(int at)
|
||
{
|
||
if (at < 0 || at >= editor.nrows) {
|
||
return;
|
||
}
|
||
|
||
/*
|
||
* Update killring with the deleted row's contents followed by a newline
|
||
* unless this deletion is an internal merge triggered by deletech at
|
||
* start-of-line. In that case, deletech will account for the single
|
||
* newline itself and we must NOT also push the entire row here.
|
||
*/
|
||
if (!editor.suppress_killrow) {
|
||
struct erow* r = &editor.row[at];
|
||
/* Start or continue the kill sequence based on editor.killing */
|
||
if (r->size > 0) {
|
||
/* push raw bytes of the line */
|
||
if (!editor.killing) {
|
||
killring_start_with_char((unsigned char)r->line[0]);
|
||
for (int i = 1; i < r->size; i++) {
|
||
killring_append_char((unsigned char)r->line[i]);
|
||
}
|
||
} else {
|
||
for (int i = 0; i < r->size; i++) {
|
||
killring_append_char((unsigned char)r->line[i]);
|
||
}
|
||
}
|
||
killring_append_char('\n');
|
||
editor.killing = 1;
|
||
} else {
|
||
if (!editor.killing) {
|
||
killring_start_with_char('\n');
|
||
}
|
||
else {
|
||
killring_append_char('\n');
|
||
}
|
||
editor.killing = 1;
|
||
}
|
||
}
|
||
|
||
erow_free(&editor.row[at]);
|
||
memmove(&editor.row[at], &editor.row[at + 1],
|
||
sizeof(struct erow) * (editor.nrows - at - 1));
|
||
editor.nrows--;
|
||
editor.dirty++;
|
||
}
|
||
|
||
|
||
void
|
||
row_append_row(struct erow *row, char *s, int len)
|
||
{
|
||
row->line = realloc(row->line, row->size + len + 1);
|
||
assert(row->line != NULL);
|
||
memcpy(&row->line[row->size], s, len);
|
||
row->size += len;
|
||
row->line[row->size] = '\0';
|
||
erow_update(row);
|
||
editor.dirty++;
|
||
}
|
||
|
||
|
||
void
|
||
row_insert_ch(struct erow *row, int at, int16_t c)
|
||
{
|
||
/*
|
||
* row_insert_ch just concerns itself with how to update a row.
|
||
*/
|
||
if ((at < 0) || (at > row->size)) {
|
||
at = row->size;
|
||
}
|
||
assert(c > 0);
|
||
|
||
row->line = realloc(row->line, row->size+2);
|
||
assert(row->line != NULL);
|
||
memmove(&row->line[at+1], &row->line[at], row->size - at + 1);
|
||
row->size++;
|
||
row->line[at] = c & 0xff;
|
||
|
||
erow_update(row);
|
||
}
|
||
|
||
|
||
void
|
||
row_delete_ch(struct erow *row, int at)
|
||
{
|
||
if (at < 0 || at >= row->size) {
|
||
return;
|
||
}
|
||
|
||
memmove(&row->line[at], &row->line[at+1], row->size-at);
|
||
row->size--;
|
||
erow_update(row);
|
||
editor.dirty++;
|
||
}
|
||
|
||
|
||
void
|
||
insertch(int16_t c)
|
||
{
|
||
/*
|
||
* insert_ch doesn't need to worry about how to update a
|
||
* a row; it can just figure out where the cursor is
|
||
* at and what to do.
|
||
*/
|
||
if (editor.cury == editor.nrows) {
|
||
erow_insert(editor.nrows, "", 0);
|
||
}
|
||
|
||
/* Any insertion breaks a delete sequence for killring chaining. */
|
||
editor.killing = 0;
|
||
/* Ensure we pass a non-negative byte value to avoid assert(c > 0). */
|
||
row_insert_ch(&editor.row[editor.cury], editor.curx,
|
||
(int16_t)(c & 0xff));
|
||
editor.curx++;
|
||
editor.dirty++;
|
||
}
|
||
|
||
|
||
/*
|
||
* deletech
|
||
*/
|
||
void
|
||
deletech(uint8_t op)
|
||
{
|
||
struct erow* row = NULL;
|
||
unsigned char dch = 0;
|
||
|
||
if (editor.cury >= editor.nrows) {
|
||
return;
|
||
}
|
||
|
||
if (editor.cury == 0 && editor.curx == 0) {
|
||
return;
|
||
}
|
||
|
||
row = &editor.row[editor.cury];
|
||
|
||
/* determine which character is being deleted for killring purposes */
|
||
if (editor.curx > 0) {
|
||
dch = (unsigned char)row->line[editor.curx - 1];
|
||
}
|
||
else {
|
||
/* deleting at start of line merges with previous line: treat as newline */
|
||
dch = '\n';
|
||
}
|
||
|
||
/* update buffer */
|
||
if (editor.curx > 0) {
|
||
row_delete_ch(row, editor.curx - 1);
|
||
editor.curx--;
|
||
}
|
||
else {
|
||
editor.curx = editor.row[editor.cury - 1].size;
|
||
row_append_row(&editor.row[editor.cury - 1], row->line,
|
||
row->size);
|
||
int prev = editor.suppress_killrow;
|
||
editor.suppress_killrow = 1; /* prevent killring update on internal row delete */
|
||
delete_row(editor.cury);
|
||
editor.suppress_killrow = prev;
|
||
editor.cury--;
|
||
}
|
||
|
||
/* update killring if requested */
|
||
if (op == KILLRING_FLUSH) {
|
||
killring_flush();
|
||
editor.killing = 0;
|
||
return;
|
||
}
|
||
|
||
if (op == KILLRING_NO_OP) {
|
||
/* Do not modify killring or chaining state. */
|
||
return;
|
||
}
|
||
|
||
if (!editor.killing) {
|
||
killring_start_with_char(dch);
|
||
editor.killing = 1;
|
||
return;
|
||
}
|
||
|
||
if (op == KILLING_SET) {
|
||
killring_start_with_char(dch);
|
||
editor.killing = 1;
|
||
}
|
||
else if (op == KILLRING_APPEND) {
|
||
killring_append_char(dch);
|
||
}
|
||
else if (op == KILLRING_PREPEND) {
|
||
killring_prepend_char(dch);
|
||
}
|
||
}
|
||
|
||
|
||
void
|
||
open_file(const char *filename)
|
||
{
|
||
char *line = NULL;
|
||
size_t linecap = 0;
|
||
ssize_t linelen;
|
||
FILE *fp = NULL;
|
||
|
||
reset_editor();
|
||
|
||
editor.filename = strdup(filename);
|
||
assert(editor.filename != NULL);
|
||
|
||
editor.dirty = 0;
|
||
if ((fp = fopen(filename, "r")) == NULL) {
|
||
if (errno == ENOENT) {
|
||
editor_set_status("[new file]");
|
||
return;
|
||
}
|
||
die("fopen");
|
||
}
|
||
|
||
while ((linelen = getline(&line, &linecap, fp)) != -1) {
|
||
if (linelen != -1) {
|
||
while ((linelen > 0) && ((line[linelen-1] == '\r') ||
|
||
(line[linelen-1] == '\n'))) {
|
||
linelen--;
|
||
}
|
||
|
||
erow_insert(editor.nrows, line, linelen);
|
||
}
|
||
}
|
||
|
||
free(line);
|
||
line = NULL;
|
||
fclose(fp);
|
||
}
|
||
|
||
|
||
/*
|
||
* convert our rows to a buffer; caller must free it.
|
||
*/
|
||
char *
|
||
rows_to_buffer(int *buflen)
|
||
{
|
||
int len = 0;
|
||
int j;
|
||
char *buf = NULL;
|
||
char *p = NULL;
|
||
|
||
for (j = 0; j < editor.nrows; j++) {
|
||
/* extra byte for newline */
|
||
len += editor.row[j].size+1;
|
||
}
|
||
|
||
if (len == 0) {
|
||
return NULL;
|
||
}
|
||
|
||
*buflen = len;
|
||
buf = malloc(len);
|
||
assert(buf != NULL);
|
||
p = buf;
|
||
|
||
for (j = 0; j < editor.nrows; j++) {
|
||
memcpy(p, editor.row[j].line, editor.row[j].size);
|
||
p += editor.row[j].size;
|
||
*p++ = '\n';
|
||
}
|
||
|
||
return buf;
|
||
}
|
||
|
||
|
||
int
|
||
save_file(void)
|
||
{
|
||
int fd = -1;
|
||
int len;
|
||
int status = 1; /* will be used as exit code */
|
||
char *buf;
|
||
|
||
if (!editor.dirty) {
|
||
editor_set_status("No changes to save.");
|
||
return 0;
|
||
}
|
||
|
||
if (editor.filename == NULL) {
|
||
editor.filename = editor_prompt("Filename: %s", NULL);
|
||
if (editor.filename == NULL) {
|
||
editor_set_status("Save aborted.");
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
buf = rows_to_buffer(&len);
|
||
if ((fd = open(editor.filename, O_RDWR|O_CREAT, 0644)) == -1) {
|
||
goto save_exit;
|
||
}
|
||
|
||
if (-1 == ftruncate(fd, len)) {
|
||
goto save_exit;
|
||
}
|
||
|
||
if (len == 0) {
|
||
status = 0;
|
||
goto save_exit;
|
||
}
|
||
|
||
if ((ssize_t)len != write(fd, buf, len)) {
|
||
goto save_exit;
|
||
}
|
||
|
||
status = 0;
|
||
|
||
save_exit:
|
||
if (fd) close(fd);
|
||
if (buf) {
|
||
free(buf);
|
||
buf = NULL;
|
||
}
|
||
|
||
if (status != 0) {
|
||
buf = strerror(errno);
|
||
editor_set_status("Error writing %s: %s", editor.filename,
|
||
buf);
|
||
} else {
|
||
editor_set_status("Wrote %d bytes to %s.", len,
|
||
editor.filename);
|
||
editor.dirty = 0;
|
||
}
|
||
|
||
return status;
|
||
}
|
||
|
||
|
||
uint16_t
|
||
is_arrow_key(int16_t c)
|
||
{
|
||
switch (c) {
|
||
case ARROW_DOWN:
|
||
case ARROW_LEFT:
|
||
case ARROW_RIGHT:
|
||
case ARROW_UP:
|
||
case CTRL_KEY('p'):
|
||
case CTRL_KEY('n'):
|
||
case CTRL_KEY('f'):
|
||
case CTRL_KEY('b'):
|
||
case CTRL_KEY('a'):
|
||
case CTRL_KEY('e'):
|
||
case END_KEY:
|
||
case HOME_KEY:
|
||
case PG_DN:
|
||
case PG_UP:
|
||
return 1;
|
||
};
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
int16_t
|
||
get_keypress(void)
|
||
{
|
||
char seq[3];
|
||
/* read raw byte so UTF-8 bytes (>=0x80) are not sign-extended */
|
||
unsigned char uc = 0;
|
||
int16_t c;
|
||
|
||
if (read(STDIN_FILENO, &uc, 1) == -1) {
|
||
die("get_keypress:read");
|
||
}
|
||
|
||
c = (int16_t)uc;
|
||
|
||
if (c == 0x1b) {
|
||
if (read(STDIN_FILENO, &seq[0], 1) != 1) return c;
|
||
if (read(STDIN_FILENO, &seq[1], 1) != 1) return c;
|
||
|
||
if (seq[0] == '[') {
|
||
if (seq[1] < 'A') {
|
||
if (read(STDIN_FILENO, &seq[2], 1) != 1)
|
||
return c;
|
||
if (seq[2] == '~') {
|
||
switch (seq[1]) {
|
||
case '1': return HOME_KEY;
|
||
case '3': return DEL_KEY;
|
||
case '4': return END_KEY;
|
||
case '5': return PG_UP;
|
||
case '6': return PG_DN;
|
||
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 'F': return END_KEY;
|
||
case 'H': return HOME_KEY;
|
||
|
||
default:
|
||
/* nada */ ;
|
||
}
|
||
}
|
||
}
|
||
else if (seq[0] == 'O') {
|
||
switch (seq[1]) {
|
||
case 'F': return END_KEY;
|
||
case 'H': return HOME_KEY;
|
||
}
|
||
}
|
||
|
||
return 0x1b;
|
||
}
|
||
|
||
return c;
|
||
}
|
||
|
||
|
||
char *
|
||
editor_prompt(char *prompt, void (*cb)(char *, int16_t))
|
||
{
|
||
size_t bufsz = 128;
|
||
char *buf = malloc(bufsz);
|
||
size_t buflen = 0;
|
||
int16_t c;
|
||
|
||
buf[0] = '\0';
|
||
|
||
while (1) {
|
||
editor_set_status(prompt, buf);
|
||
display_refresh();
|
||
while ((c = get_keypress()) <= 0) ;
|
||
if (c == DEL_KEY || c == CTRL_KEY('h') || c == BACKSPACE) {
|
||
if (buflen != 0) {
|
||
buf[--buflen] = '\0';
|
||
}
|
||
} else if (c == ESC_KEY || c == CTRL_KEY('g')) {
|
||
editor_set_status("");
|
||
if (cb) {
|
||
cb(buf, c);
|
||
}
|
||
free(buf);
|
||
return NULL;
|
||
} else if (c == '\r') {
|
||
if (buflen != 0) {
|
||
editor_set_status("");
|
||
if (cb) {
|
||
cb(buf, c);
|
||
}
|
||
return buf;
|
||
}
|
||
} else if ((c == TAB_KEY) || (c >= 0x20 && c != 0x7f)) {
|
||
if (buflen == bufsz - 1) {
|
||
bufsz *= 2;
|
||
buf = realloc(buf, bufsz);
|
||
assert(buf != NULL);
|
||
}
|
||
|
||
buf[buflen++] = (char)(c & 0xff);
|
||
buf[buflen] = '\0';
|
||
}
|
||
|
||
if (cb) {
|
||
cb(buf, c);
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
void
|
||
editor_find_callback(char *query, int16_t c)
|
||
{
|
||
static int lmatch = -1;
|
||
static int dir = 1;
|
||
int i, current;
|
||
char *match;
|
||
struct erow *row;
|
||
|
||
if (c == '\r' || c == ESC_KEY) {
|
||
/* reset search */
|
||
lmatch = -1;
|
||
dir = 1;
|
||
return;
|
||
} else if (c == ARROW_RIGHT || c == ARROW_DOWN || c == CTRL_KEY('s')) {
|
||
dir = 1;
|
||
} else if (c == ARROW_LEFT || c == ARROW_UP) {
|
||
dir = -1;
|
||
} else {
|
||
lmatch = -1;
|
||
dir = 1;
|
||
}
|
||
|
||
if (lmatch == -1) {
|
||
dir = 1;
|
||
}
|
||
current = lmatch;
|
||
|
||
for (i = 0; i < editor.nrows; i++) {
|
||
current += dir;
|
||
if (current == -1) {
|
||
current = editor.nrows - 1;
|
||
} else if (current == editor.nrows) {
|
||
current = 0;
|
||
}
|
||
|
||
row = &editor.row[current];
|
||
match = strstr(row->render, query);
|
||
if (match) {
|
||
lmatch = current;
|
||
editor.cury = current;
|
||
editor.curx = erow_render_to_cursor(row,
|
||
match - row->render);
|
||
if (editor.curx > row->size) {
|
||
editor.curx = row->size;
|
||
}
|
||
/*
|
||
* after this, scroll will put the match line at
|
||
* the top of the screen.
|
||
*/
|
||
editor.rowoffs = editor.nrows;
|
||
break;
|
||
}
|
||
}
|
||
|
||
display_refresh();
|
||
}
|
||
|
||
|
||
void
|
||
editor_find(void)
|
||
{
|
||
char *query;
|
||
int scx = editor.curx;
|
||
int scy = editor.cury;
|
||
int sco = editor.coloffs;
|
||
int sro = editor.rowoffs;
|
||
|
||
query = editor_prompt("Search (ESC to cancel): %s",
|
||
editor_find_callback);
|
||
if (query) {
|
||
free(query);
|
||
} else {
|
||
editor.curx = scx;
|
||
editor.cury = scy;
|
||
editor.coloffs = sco;
|
||
editor.rowoffs = sro;
|
||
}
|
||
|
||
display_refresh();
|
||
}
|
||
|
||
|
||
void
|
||
editor_openfile(void)
|
||
{
|
||
char *filename;
|
||
|
||
/* TODO(kyle): combine with dirutils for tab-completion */
|
||
filename = editor_prompt("Load file: %s", NULL);
|
||
if (filename == NULL) {
|
||
return;
|
||
}
|
||
|
||
open_file(filename);
|
||
}
|
||
|
||
|
||
void
|
||
move_cursor(int16_t c)
|
||
{
|
||
struct erow* row;
|
||
int reps;
|
||
|
||
row = (editor.cury >= editor.nrows) ? NULL : &editor.row[editor.cury];
|
||
|
||
switch (c) {
|
||
case ARROW_UP:
|
||
case CTRL_KEY('p'):
|
||
if (editor.cury > 0) {
|
||
editor.cury--;
|
||
}
|
||
break;
|
||
case ARROW_DOWN:
|
||
case CTRL_KEY('n'):
|
||
if (editor.cury < editor.nrows) {
|
||
editor.cury++;
|
||
}
|
||
break;
|
||
case ARROW_RIGHT:
|
||
case CTRL_KEY('f'):
|
||
if (row && editor.curx < row->size) {
|
||
editor.curx++;
|
||
/* skip over UTF-8 continuation bytes */
|
||
while (row && editor.curx < row->size &&
|
||
((unsigned char)row->line[editor.curx] & 0xC0) == 0x80) {
|
||
editor.curx++;
|
||
}
|
||
}
|
||
else if (row && editor.curx == row->size) {
|
||
editor.cury++;
|
||
editor.curx = 0;
|
||
}
|
||
break;
|
||
case ARROW_LEFT:
|
||
case CTRL_KEY('b'):
|
||
if (editor.curx > 0) {
|
||
editor.curx--;
|
||
/* move to the start byte if we landed on a continuation */
|
||
while (editor.curx > 0 &&
|
||
((unsigned char)row->line[editor.curx] & 0xC0) == 0x80) {
|
||
editor.curx--;
|
||
}
|
||
}
|
||
else if (editor.cury > 0) {
|
||
editor.cury--;
|
||
editor.curx = editor.row[editor.cury].size;
|
||
/* ensure at a codepoint boundary at end of previous line */
|
||
row = &editor.row[editor.cury];
|
||
while (editor.curx > 0 &&
|
||
((unsigned char)row->line[editor.curx] & 0xC0) == 0x80) {
|
||
editor.curx--;
|
||
}
|
||
}
|
||
break;
|
||
case PG_UP:
|
||
case PG_DN:
|
||
if (c == PG_UP) {
|
||
editor.cury = editor.rowoffs;
|
||
}
|
||
else if (c == PG_DN) {
|
||
editor.cury = editor.rowoffs + editor.rows - 1;
|
||
if (editor.cury > editor.nrows) {
|
||
editor.cury = editor.nrows;
|
||
}
|
||
}
|
||
|
||
reps = editor.rows;
|
||
while (--reps) {
|
||
move_cursor(c == PG_UP ? ARROW_UP : ARROW_DOWN);
|
||
}
|
||
|
||
break;
|
||
|
||
case HOME_KEY:
|
||
case CTRL_KEY('a'):
|
||
editor.curx = 0;
|
||
break;
|
||
case END_KEY:
|
||
case CTRL_KEY('e'):
|
||
if (editor.nrows == 0) {
|
||
break;
|
||
}
|
||
editor.curx = editor.row[editor.cury].size;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
|
||
|
||
row = (editor.cury >= editor.nrows) ? NULL : &editor.row[editor.cury];
|
||
reps = row ? row->size : 0;
|
||
if (editor.curx > reps) {
|
||
editor.curx = reps;
|
||
}
|
||
}
|
||
|
||
|
||
void
|
||
newline(void)
|
||
{
|
||
struct erow *row = NULL;
|
||
|
||
if (editor.curx == 0) {
|
||
erow_insert(editor.cury, "", 0);
|
||
} else {
|
||
row = &editor.row[editor.cury];
|
||
erow_insert(editor.cury + 1, &row->line[editor.curx],
|
||
row->size - editor.curx);
|
||
row = &editor.row[editor.cury];
|
||
row->size = editor.curx;
|
||
row->line[row->size] = '\0';
|
||
erow_update(row);
|
||
}
|
||
|
||
editor.cury++;
|
||
editor.curx = 0;
|
||
/* Any insertion breaks a delete sequence for killring chaining. */
|
||
editor.killing = 0;
|
||
}
|
||
|
||
|
||
void
|
||
process_kcommand(int16_t c)
|
||
{
|
||
switch (c) {
|
||
case 'q':
|
||
case CTRL_KEY('q'):
|
||
if (editor.dirty && editor.dirtyex) {
|
||
editor_set_status("File not saved - C-k q again to quit.");
|
||
editor.dirtyex = 0;
|
||
return;
|
||
}
|
||
exit(0);
|
||
case CTRL_KEY('s'):
|
||
case 's':
|
||
save_file();
|
||
break;
|
||
case CTRL_KEY('x'):
|
||
case 'x':
|
||
exit(save_file());
|
||
case CTRL_KEY('d'):
|
||
delete_row(editor.cury);
|
||
break;
|
||
case 'd':
|
||
if (editor.curx == 0 && cursor_at_eol()) {
|
||
delete_row(editor.cury);
|
||
return;
|
||
}
|
||
|
||
while ((editor.row[editor.cury].size - editor.curx) > 0) {
|
||
process_normal(DEL_KEY);
|
||
}
|
||
|
||
break;
|
||
case 'g':
|
||
case CTRL_KEY('g'):
|
||
goto_line();
|
||
break;
|
||
case BACKSPACE:
|
||
while (editor.curx > 0) {
|
||
process_normal(BACKSPACE);
|
||
}
|
||
break;
|
||
case CTRL_KEY('\\'):
|
||
/* sometimes it's nice to dump core */
|
||
disable_termraw();
|
||
abort();
|
||
case 'e':
|
||
case CTRL_KEY('e'):
|
||
if (editor.dirty && editor.dirtyex) {
|
||
editor_set_status("File not saved - C-k e again to open a new file anyways.");
|
||
editor.dirtyex = 0;
|
||
return;
|
||
}
|
||
editor_openfile();
|
||
break;
|
||
case 'f':
|
||
editor_find();
|
||
break;
|
||
case 'm':
|
||
if (system("make") != 0) {
|
||
editor_set_status("process failed: %s", strerror(errno));
|
||
} else {
|
||
editor_set_status("make: ok");
|
||
}
|
||
break;
|
||
case 'y':
|
||
killring_yank();
|
||
break;
|
||
default:
|
||
editor_set_status("unknown kcommand: %04x", c);
|
||
return;
|
||
}
|
||
|
||
editor.dirtyex = 1;
|
||
return;
|
||
}
|
||
|
||
|
||
void
|
||
process_normal(int16_t c)
|
||
{
|
||
if (is_arrow_key(c)) {
|
||
/* moving the cursor breaks a delete sequence */
|
||
editor.killing = 0;
|
||
move_cursor(c);
|
||
return;
|
||
}
|
||
|
||
switch (c) {
|
||
case '\r':
|
||
newline();
|
||
break;
|
||
case CTRL_KEY('k'):
|
||
editor.mode = MODE_KCOMMAND;
|
||
return;
|
||
case BACKSPACE:
|
||
case CTRL_KEY('h'):
|
||
case CTRL_KEY('d'):
|
||
case DEL_KEY:
|
||
if (c == DEL_KEY || c == CTRL_KEY('d')) {
|
||
move_cursor(ARROW_RIGHT);
|
||
deletech(KILLRING_APPEND);
|
||
}
|
||
else {
|
||
deletech(KILLRING_PREPEND);
|
||
}
|
||
break;
|
||
case CTRL_KEY('l'):
|
||
display_refresh();
|
||
break;
|
||
case CTRL_KEY('s'):
|
||
editor_find();
|
||
break;
|
||
case ESC_KEY:
|
||
editor.mode = MODE_ESCAPE;
|
||
break;
|
||
default:
|
||
/* Insert any printable byte: ASCII 0x20–0x7E and all bytes >=0x80. */
|
||
if ((c == TAB_KEY) || (c >= 0x20 && c != 0x7f)) {
|
||
insertch(c);
|
||
}
|
||
break;
|
||
}
|
||
|
||
editor.dirtyex = 1;
|
||
}
|
||
|
||
|
||
void
|
||
process_escape(int16_t c)
|
||
{
|
||
editor_set_status("hi");
|
||
|
||
switch (c) {
|
||
case '>':
|
||
editor.cury = editor.nrows;
|
||
editor.curx = 0;
|
||
break;
|
||
case '<':
|
||
editor.cury = 0;
|
||
editor.curx = 0;
|
||
break;
|
||
case 'b':
|
||
find_prev_word();
|
||
break;
|
||
case 'd':
|
||
delete_next_word();
|
||
break;
|
||
case 'f':
|
||
find_next_word();
|
||
break;
|
||
case BACKSPACE:
|
||
delete_prev_word();
|
||
break;
|
||
default:
|
||
editor_set_status("unknown ESC key: %04x", c);
|
||
}
|
||
}
|
||
|
||
|
||
int
|
||
process_keypress(void)
|
||
{
|
||
int16_t c = get_keypress();
|
||
|
||
|
||
/* we didn't actually read a key */
|
||
if (c <= 0) {
|
||
return 0;
|
||
}
|
||
|
||
switch (editor.mode) {
|
||
case MODE_KCOMMAND:
|
||
process_kcommand(c);
|
||
editor.mode = MODE_NORMAL;
|
||
break;
|
||
case MODE_NORMAL:
|
||
process_normal(c);
|
||
break;
|
||
case MODE_ESCAPE:
|
||
process_escape(c);
|
||
editor.mode = MODE_NORMAL;
|
||
break;
|
||
default:
|
||
editor_set_status("we're in the %d-D space now cap'n", editor.mode);
|
||
editor.mode = MODE_NORMAL;
|
||
}
|
||
|
||
return 1;
|
||
}
|
||
|
||
|
||
/*
|
||
* A text editor needs the terminal to be in raw mode; but the default
|
||
* is to be in canonical (cooked) mode, which is a buffered input mode.
|
||
*/
|
||
void
|
||
enable_termraw(void)
|
||
{
|
||
struct termios raw;
|
||
|
||
/* Read the current terminal parameters for standard input. */
|
||
if (tcgetattr(STDIN_FILENO, &raw) == -1) {
|
||
die("tcgetattr while enabling raw mode");
|
||
}
|
||
|
||
/*
|
||
* Put the terminal into raw mode.
|
||
*/
|
||
cfmakeraw(&raw);
|
||
|
||
/*
|
||
* Set timeout for read(2).
|
||
*
|
||
* VMIN: what is the minimum number of bytes required for read
|
||
* to return?
|
||
*
|
||
* VTIME: max time before read(2) returns in hundreds of milli-
|
||
* seconds.
|
||
*/
|
||
raw.c_cc[VMIN] = 0;
|
||
raw.c_cc[VTIME] = 1;
|
||
|
||
/*
|
||
* Now write the terminal parameters to the current terminal,
|
||
* after flushing any waiting input out.
|
||
*/
|
||
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) {
|
||
die("tcsetattr while enabling raw mode");
|
||
}
|
||
}
|
||
|
||
|
||
void
|
||
display_clear(struct abuf *ab)
|
||
{
|
||
if (ab == NULL) {
|
||
write(STDOUT_FILENO, ESCSEQ "2J", 4);
|
||
write(STDOUT_FILENO, ESCSEQ "H", 3);
|
||
} else {
|
||
ab_append(ab, ESCSEQ "2J", 4);
|
||
ab_append(ab, ESCSEQ "H", 3);
|
||
}
|
||
}
|
||
|
||
|
||
void
|
||
disable_termraw(void)
|
||
{
|
||
display_clear(NULL);
|
||
|
||
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &editor.entry_term) == -1) {
|
||
die("couldn't disable terminal raw mode");
|
||
}
|
||
}
|
||
|
||
|
||
void
|
||
setup_terminal(void)
|
||
{
|
||
if (tcgetattr(STDIN_FILENO, &editor.entry_term) == -1) {
|
||
die("can't snapshot terminal settings");
|
||
}
|
||
atexit(disable_termraw);
|
||
enable_termraw();
|
||
}
|
||
|
||
|
||
void
|
||
draw_rows(struct abuf *ab)
|
||
{
|
||
assert(editor.cols >= 0);
|
||
|
||
char buf[editor.cols];
|
||
int buflen, filerow, padding;
|
||
int y;
|
||
|
||
for (y = 0; y < editor.rows; y++) {
|
||
filerow = y + editor.rowoffs;
|
||
if (filerow >= editor.nrows) {
|
||
if ((editor.nrows == 0) && (y == editor.rows / 3)) {
|
||
buflen = snprintf(buf, sizeof(buf),
|
||
"%s", KE_VERSION);
|
||
padding = (editor.rows - buflen) / 2;
|
||
|
||
if (padding) {
|
||
ab_append(ab, "|", 1);
|
||
padding--;
|
||
}
|
||
|
||
while (padding--) ab_append(ab, " ", 1);
|
||
ab_append(ab, buf, buflen);
|
||
} else {
|
||
ab_append(ab, "|", 1);
|
||
}
|
||
} else {
|
||
erow_update(&editor.row[filerow]);
|
||
buflen = editor.row[filerow].rsize - editor.coloffs;
|
||
if (buflen < 0) {
|
||
buflen = 0;
|
||
}
|
||
|
||
if (buflen > editor.cols) {
|
||
buflen = editor.cols;
|
||
}
|
||
ab_append(ab, editor.row[filerow].render+editor.coloffs,
|
||
buflen);
|
||
}
|
||
ab_append(ab, ESCSEQ "K", 3);
|
||
ab_append(ab, "\r\n", 2);
|
||
}
|
||
}
|
||
|
||
|
||
char
|
||
status_mode_char(void)
|
||
{
|
||
switch (editor.mode) {
|
||
case MODE_NORMAL:
|
||
return 'N';
|
||
case MODE_KCOMMAND:
|
||
return 'K';
|
||
case MODE_ESCAPE:
|
||
return 'E';
|
||
default:
|
||
return '?';
|
||
}
|
||
}
|
||
|
||
|
||
void
|
||
draw_status_bar(struct abuf *ab)
|
||
{
|
||
char status[editor.cols];
|
||
char rstatus[editor.cols];
|
||
int len, rlen;
|
||
|
||
len = snprintf(status, sizeof(status), "%c%cke: %.20s - %d lines",
|
||
status_mode_char(),
|
||
editor.dirty ? '!' : '-',
|
||
editor.filename ? editor.filename : "[no file]",
|
||
editor.nrows);
|
||
rlen = snprintf(rstatus, sizeof(rstatus), "L%d/%d C%d",
|
||
editor.cury+1, editor.nrows, editor.curx+1);
|
||
|
||
ab_append(ab, ESCSEQ "7m", 4);
|
||
ab_append(ab, status, len);
|
||
while (len < editor.cols) {
|
||
if ((editor.cols - len) == rlen) {
|
||
ab_append(ab, rstatus, rlen);
|
||
break;
|
||
}
|
||
ab_append(ab, " ", 1);
|
||
len++;
|
||
}
|
||
ab_append(ab, ESCSEQ "m", 3);
|
||
ab_append(ab, "\r\n", 2);
|
||
}
|
||
|
||
|
||
void
|
||
draw_message_line(struct abuf *ab)
|
||
{
|
||
int len = strlen(editor.msg);
|
||
|
||
ab_append(ab, ESCSEQ "K", 3);
|
||
if (len > editor.cols) {
|
||
len = editor.cols;
|
||
}
|
||
|
||
if (len && ((time(NULL) - editor.msgtm) < MSG_TIMEO)) {
|
||
ab_append(ab, editor.msg, len);
|
||
}
|
||
}
|
||
|
||
|
||
void
|
||
scroll(void)
|
||
{
|
||
editor.rx = 0;
|
||
if (editor.cury < editor.nrows) {
|
||
editor.rx = erow_render_to_cursor(
|
||
&editor.row[editor.cury],
|
||
editor.curx);
|
||
}
|
||
|
||
if (editor.cury < editor.rowoffs) {
|
||
editor.rowoffs = editor.cury;
|
||
}
|
||
|
||
if (editor.cury >= editor.rowoffs + editor.rows) {
|
||
editor.rowoffs = editor.cury - editor.rows + 1;
|
||
}
|
||
|
||
if (editor.rx < editor.coloffs) {
|
||
editor.coloffs = editor.rx;
|
||
}
|
||
|
||
if (editor.rx >= editor.coloffs + editor.cols) {
|
||
editor.coloffs = editor.rx - editor.cols + 1;
|
||
}
|
||
}
|
||
|
||
|
||
void
|
||
display_refresh(void)
|
||
{
|
||
char buf[32];
|
||
struct abuf ab = ABUF_INIT;
|
||
|
||
scroll();
|
||
|
||
ab_append(&ab, ESCSEQ "?25l", 6);
|
||
display_clear(&ab);
|
||
|
||
draw_rows(&ab);
|
||
draw_status_bar(&ab);
|
||
draw_message_line(&ab);
|
||
|
||
snprintf(buf, sizeof(buf), ESCSEQ "%d;%dH",
|
||
(editor.cury-editor.rowoffs)+1,
|
||
(editor.rx-editor.coloffs)+1);
|
||
ab_append(&ab, buf, strnlen(buf, 32));
|
||
/* ab_append(&ab, ESCSEQ "1;2H", 7); */
|
||
ab_append(&ab, ESCSEQ "?25h", 6);
|
||
|
||
write(STDOUT_FILENO, ab.b, ab.len);
|
||
ab_free(&ab);
|
||
}
|
||
|
||
|
||
void
|
||
editor_set_status(const char *fmt, ...)
|
||
{
|
||
va_list ap;
|
||
|
||
va_start(ap, fmt);
|
||
vsnprintf(editor.msg, sizeof(editor.msg), fmt, ap);
|
||
va_end(ap);
|
||
|
||
editor.msgtm = time(NULL);
|
||
}
|
||
|
||
|
||
void
|
||
loop(void)
|
||
{
|
||
int up = 1; /* update on the first runthrough */
|
||
|
||
while (1) {
|
||
if (up) display_refresh();
|
||
|
||
/*
|
||
* ke should only refresh the display if it has received keyboard
|
||
* input; if it has, drain all the inputs. This is useful for
|
||
* handling pastes without massive screen flicker.
|
||
*
|
||
*/
|
||
if ((up = process_keypress()) != 0) {
|
||
while (process_keypress()) ;
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
int
|
||
main(int argc, char *argv[])
|
||
{
|
||
// Set locale for proper UTF-8 handling
|
||
setlocale(LC_ALL, "");
|
||
|
||
setup_terminal();
|
||
init_editor();
|
||
|
||
if (argc > 1) {
|
||
open_file(argv[1]);
|
||
}
|
||
|
||
editor_set_status("C-k q to exit / C-k d to dump core");
|
||
|
||
display_clear(NULL);
|
||
loop();
|
||
|
||
return 0;
|
||
}
|