okay back to the one file
This commit is contained in:
parent
334d32193f
commit
df1a8c57aa
|
|
@ -1,9 +1,5 @@
|
|||
BIN := ke
|
||||
OBJS := main.o \
|
||||
display.o \
|
||||
keys.o \
|
||||
terminal.o \
|
||||
util.o
|
||||
OBJS := main.o
|
||||
|
||||
LDFLAGS := -static
|
||||
CFLAGS := -pedantic -Wall -Werror -Wextra -O2 -std=c99
|
||||
|
|
|
|||
|
|
@ -0,0 +1,13 @@
|
|||
ESCAPE CODES
|
||||
============
|
||||
|
||||
note: these will all omit the leading ESC[
|
||||
https://vt100.net/docs/vt100-ug/chapter3.html
|
||||
|
||||
H reposition cursor @ 1,1
|
||||
${row};${col}H reposition cursor @ ${row},${col}
|
||||
J erase-in-display
|
||||
h set mode
|
||||
l reset mode
|
||||
modes:
|
||||
?25 hide cursor feature
|
||||
253
ke/main.c
253
ke/main.c
|
|
@ -1,31 +1,280 @@
|
|||
#include <sys/ioctl.h>
|
||||
#include <ctype.h>
|
||||
#include <errno.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <termios.h>
|
||||
#include <unistd.h>
|
||||
|
||||
#include "display.h"
|
||||
#include "keys.h"
|
||||
#include "terminal.h"
|
||||
#include "util.h"
|
||||
|
||||
|
||||
#define ESCSEQ "\x1b["
|
||||
#define CTRL_KEY(key) ((key)&0x1f)
|
||||
|
||||
/*
|
||||
* define the keyboard input modes
|
||||
* normal: no special mode
|
||||
* kcommand: ^k commands
|
||||
*/
|
||||
#define MODE_NORMAL 0
|
||||
#define MODE_KCOMMAND 1
|
||||
|
||||
|
||||
struct {
|
||||
struct termios entry_term;
|
||||
int rows, cols;
|
||||
} editor;
|
||||
|
||||
|
||||
/* append buffer */
|
||||
struct abuf {
|
||||
char *b;
|
||||
int len;
|
||||
};
|
||||
#define ABUF_INIT {NULL, 0}
|
||||
|
||||
|
||||
void
|
||||
ab_append(struct abuf *buf, const char *s, int len)
|
||||
{
|
||||
char *nc = realloc(buf->b, buf->len + len);
|
||||
|
||||
if (nc == NULL) {
|
||||
return;
|
||||
}
|
||||
|
||||
memcpy(&nc[buf->len], s, len);
|
||||
buf->b = nc;
|
||||
buf->len += len; /* DANGER: overflow */
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
ab_free(struct abuf *buf)
|
||||
{
|
||||
free(buf->b);
|
||||
}
|
||||
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
|
||||
static char
|
||||
get_keypress()
|
||||
{
|
||||
char c = 0;
|
||||
|
||||
if (read(STDIN_FILENO, &c, 1) == -1) {
|
||||
die("get_keypress:read");
|
||||
}
|
||||
|
||||
return c;
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
process_keypress()
|
||||
{
|
||||
static int m = MODE_NORMAL;
|
||||
char c = get_keypress();
|
||||
|
||||
if (c == 0x0) {
|
||||
return;
|
||||
}
|
||||
|
||||
switch (m) {
|
||||
case MODE_KCOMMAND:
|
||||
switch (c) {
|
||||
case 'q':
|
||||
case CTRL_KEY('q'):
|
||||
exit(0);
|
||||
}
|
||||
|
||||
m = MODE_NORMAL;
|
||||
return;
|
||||
}
|
||||
|
||||
if (c == CTRL_KEY('k')) {
|
||||
m = MODE_KCOMMAND;
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
static void
|
||||
enable_termraw()
|
||||
{
|
||||
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");
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
disable_termraw()
|
||||
{
|
||||
display_clear(NULL);
|
||||
|
||||
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &editor.entry_term) == -1) {
|
||||
die("couldn't disable terminal raw mode");
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
setup_terminal()
|
||||
{
|
||||
if (tcgetattr(STDIN_FILENO, &editor.entry_term) == -1) {
|
||||
die("can't snapshot terminal settings");
|
||||
}
|
||||
atexit(disable_termraw);
|
||||
enable_termraw();
|
||||
}
|
||||
|
||||
|
||||
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
|
||||
draw_rows(struct abuf *ab)
|
||||
{
|
||||
int y;
|
||||
|
||||
for (y = 0; y < editor.rows-1; y++) {
|
||||
ab_append(ab, "|\r\n", 3);
|
||||
}
|
||||
ab_append(ab, "|", 1);
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
display_refresh()
|
||||
{
|
||||
struct abuf ab = ABUF_INIT;
|
||||
|
||||
ab_append(&ab, ESCSEQ "?25l", 6);
|
||||
display_clear(&ab);
|
||||
draw_rows(&ab);
|
||||
ab_append(&ab, ESCSEQ "1;2H", 7);
|
||||
ab_append(&ab, ESCSEQ "?25h", 6);
|
||||
|
||||
write(STDOUT_FILENO, ab.b, ab.len);
|
||||
ab_free(&ab);
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
loop()
|
||||
{
|
||||
while (1) {
|
||||
display_refresh();
|
||||
process_keypress();
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* init_editor should set up the global editor struct.
|
||||
*/
|
||||
void
|
||||
init_editor()
|
||||
{
|
||||
if (get_winsz(&editor.rows, &editor.cols) == -1) {
|
||||
die("can't get window size");
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
int
|
||||
main()
|
||||
{
|
||||
setup_terminal();
|
||||
init_editor();
|
||||
|
||||
display_clear();
|
||||
display_clear(NULL);
|
||||
loop();
|
||||
|
||||
return 0;
|
||||
|
|
|
|||
|
|
@ -1,81 +0,0 @@
|
|||
#include <stdlib.h>
|
||||
#include <termios.h>
|
||||
#include <unistd.h>
|
||||
|
||||
#include "util.h"
|
||||
|
||||
|
||||
#define ESCSEQ "\x1b["
|
||||
|
||||
|
||||
static struct termios entry_term;
|
||||
|
||||
|
||||
/*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
static void
|
||||
enable_termraw()
|
||||
{
|
||||
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");
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
disable_termraw()
|
||||
{
|
||||
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &entry_term) == -1) {
|
||||
die("couldn't disable terminal raw mode");
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
setup_terminal()
|
||||
{
|
||||
if (tcgetattr(STDIN_FILENO, &entry_term) == -1) {
|
||||
die("can't snapshot terminal settings");
|
||||
}
|
||||
atexit(disable_termraw);
|
||||
enable_termraw();
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
display_clear()
|
||||
{
|
||||
write(STDOUT_FILENO, ESCSEQ "2J", 4);
|
||||
write(STDOUT_FILENO, ESCSEQ "H", 3);
|
||||
}
|
||||
|
|
@ -1,9 +0,0 @@
|
|||
#ifndef KE_TERMINAL_H
|
||||
#define KE_TERMINAL_H
|
||||
|
||||
|
||||
void setup_terminal();
|
||||
void display_clear();
|
||||
|
||||
|
||||
#endif /* KE_TERMINAL_H */
|
||||
17
ke/util.c
17
ke/util.c
|
|
@ -1,17 +0,0 @@
|
|||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
|
||||
|
||||
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);
|
||||
}
|
||||
Loading…
Reference in New Issue