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#include "reader.h"
#include <csignal>
void die(const char *s) {
write(STDOUT_FILENO, "\x1b[2J", 4);
write(STDOUT_FILENO, "\x1b[H", 3);
perror(s);
fprintf(stderr, "[exit]: die(s) invoked, exiting..\n");
exit(1);
}
static editor_cfg *g_cfg = nullptr;
void disable_raw_atexit() {
if (g_cfg) {
tcsetattr(STDIN_FILENO, TCSAFLUSH, &(g_cfg->termios_inst));
}
}
void handle_signal(int sig) {
disable_raw_atexit();
_exit(128 + sig);
}
void disable_raw(editor_cfg *cfg) {
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &(cfg->termios_inst)))
die("tcsetattr");
}
void enable_raw(editor_cfg *cfg) {
if (tcgetattr(STDIN_FILENO, &(cfg->termios_inst)) == -1)
die("tcgetattr");
g_cfg = cfg;
std::atexit(disable_raw_atexit);
std::signal(SIGINT, handle_signal);
std::signal(SIGTERM, handle_signal);
std::signal(SIGQUIT, handle_signal);
struct termios raw = cfg->termios_inst;
raw.c_iflag &= ~(IXON | ICRNL | BRKINT | INPCK | ISTRIP);
raw.c_oflag &= ~(OPOST);
raw.c_lflag &=
~(ECHO | ICANON | IEXTEN); // disables several keybinds in terminal
raw.c_cc[VMIN] = 0;
raw.c_cc[VTIME] = 1;
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1)
die("tcsetattr");
}
char editor_readkey() {
int nread;
char c;
while ((nread = read(STDIN_FILENO, &c, 1)) != 1) {
if (nread == -1 && errno != EAGAIN)
die("read");
}
return c;
}
int get_cursor_pos(int *rows, int *cols) {
char buff[32];
unsigned int i = 0;
if (write(STDOUT_FILENO, "\x1b[6n", 4) != 4) {
return -1;
}
while (i < sizeof(buff) - 1) {
if (read(STDIN_FILENO, &buff[i], 1) != 1)
break;
if (buff[i] == 'R')
break;
i++;
}
buff[i] = '\0';
if (buff[0] != '\x1b' || buff[1] != '[')
return -1;
if (sscanf(&buff[2], "%d;%d", rows, cols) != 2)
return -1;
return 0;
}
int get_window_size(int *rows, int *cols) {
struct winsize w_size;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &w_size) == -1 ||
w_size.ws_col == 0) {
if (write(STDOUT_FILENO, "\x1b[999C\x1b[999B", 12) != 12)
return -1;
return get_cursor_pos(rows, cols);
}
*rows = w_size.ws_row;
*cols = w_size.ws_col;
return 0;
}
void editor_refresh_scrn(editor_cfg *cfg) {
append_buffer::instance().append("\x1b[2J", 4);
char buff[32];
memset(buff, 0, sizeof(buff));
snprintf(buff, sizeof(buff), "\x1b[%d;%dH", cfg->screenrows / 2, cfg->screencols / 2);
append_buffer::instance().append(buff, strlen(buff));
append_buffer::instance().write_output();
append_buffer::instance().remove();
}
size_t split(const std::string &txt, std::vector<std::string> &strings, const std::string &delims) {
size_t initial_pos = txt.find_first_not_of(delims, 0);
size_t pos = txt.find_first_of(delims, initial_pos);
while (initial_pos != std::string::npos) {
strings.push_back(txt.substr(initial_pos, pos - initial_pos));
initial_pos = txt.find_first_not_of(delims, pos);
pos = txt.find_first_of(delims, initial_pos);
}
return strings.size();
}
void init_editor(editor_cfg *cfg) {
if (get_window_size(&(cfg->screenrows), &(cfg->screencols)) == -1)
die("get_window_size");
}
int is_number(char *strnum) {
std::string str = strnum;
std::string::const_iterator it = str.begin();
while (it != str.end() && std::isdigit(*it)) ++it;
return !str.empty() && it == str.end();
}
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