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#define _DEFAULT_SOURCE
#include "display.h"
#include "buffer.h"
#include <stdio.h>
#include <sys/ioctl.h>
#include <unistd.h>
#define ESC 0x1b
struct display display_create() {
struct winsize ws;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) < 0) {
// TODO: if it fails to fetch, do something?
return (struct display){
.height = 0,
.width = 0,
};
}
// save old settings
struct termios orig_term;
tcgetattr(0, &orig_term);
// set terminal to raw mode
struct termios term;
cfmakeraw(&term);
// TODO: move to kbd?
term.c_cc[VMIN] = 0;
term.c_cc[VTIME] = 0;
tcsetattr(0, TCSADRAIN, &term);
return (struct display){
.orig_term = orig_term,
.term = term,
.height = ws.ws_row,
.width = ws.ws_col,
};
}
void display_destroy(struct display *display) {
// reset old terminal mode
tcsetattr(0, TCSADRAIN, &display->orig_term);
}
void putbytes(uint8_t *line_bytes, uint32_t line_length) {
fwrite(line_bytes, 1, line_length, stdout);
}
void putbyte(uint8_t c) { putc(c, stdout); }
void put_ansiparm(int n) {
int q = n / 10;
if (q != 0) {
int r = q / 10;
if (r != 0) {
putbyte((r % 10) + '0');
}
putbyte((q % 10) + '0');
}
putbyte((n % 10) + '0');
}
void display_move_cursor(struct display *display, uint32_t row, uint32_t col) {
putbyte(ESC);
putbyte('[');
put_ansiparm(row + 1);
putbyte(';');
put_ansiparm(col + 1);
putbyte('H');
}
void display_clear(struct display *display) {
display_move_cursor(display, 0, 0);
uint8_t bytes[] = {ESC, '[', 'J'};
putbytes(bytes, 3);
}
void delete_to_eol() {
uint8_t bytes[] = {ESC, '[', 'K'};
putbytes(bytes, 3);
}
void display_update(struct display *display, struct render_cmd *cmds,
uint32_t ncmds, uint32_t currow, uint32_t curcol) {
for (uint64_t cmdi = 0; cmdi < ncmds; ++cmdi) {
struct render_cmd *cmd = &cmds[cmdi];
display_move_cursor(display, cmd->row, cmd->col);
putbytes(cmd->data, cmd->len);
delete_to_eol();
}
display_move_cursor(display, currow, curcol);
fflush(stdout);
}
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