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141 lines
2.9 KiB
C
141 lines
2.9 KiB
C
#include <signal.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <termios.h>
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#include <unistd.h>
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#define SHOW_ALTERNATIVE_SCREEN "\033[?1049h"
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#define SHOW_NORMAL_SCREEN "\033[?1049l"
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#define HIDE_CURSOR "\033[?25l"
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#define SHOW_CURSOR "\033[?25h"
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#define CLEAR_SCREEN "\033[2J"
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#define MOVE_CURSOR_HOME "\033[H"
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#define MOVE_CURSOR_UP "\x1b[1A"
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#define MOVE_CURSOR_DOWN "\x1b[1B"
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#define MOVE_CURSOR_RIGHT "\x1b[1C"
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#define MOVE_CURSOR_LEFT "\x1b[1D"
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// man console_codes
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// Directions
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// A - Up
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// B - Down
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// C - Right
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// D - Left
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typedef struct {
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int line;
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int column;
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int number_of_lines;
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int number_of_columns;
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bool resized;
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bool should_exit;
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struct termios original_termios;
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} State;
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static State state = {0};
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void sigwinch_handler(int signal)
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{
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fprintf(stderr, "INFO: received signal \"%s\"\n", strsignal(signal));
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state.resized = true;
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}
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bool get_terminal_size()
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{
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struct winsize ws;
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if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws)) {
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return false;
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}
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state.number_of_columns = ws.ws_col;
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state.number_of_lines = ws.ws_row;
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return true;
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}
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void enable_raw_mode(void)
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{
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struct termios t = state.original_termios;
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if (tcgetattr(STDIN_FILENO, &state.original_termios) == -1) {
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perror("tcgetattr");
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exit(1);
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}
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t = state.original_termios;
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t.c_lflag &= ~(ECHO | ICANON | ISIG); // turn off echo, canonical mode, signals
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t.c_iflag &= ~(IXON | ICRNL); // disable Ctrl-S/Q and CR->NL
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t.c_oflag &= ~(OPOST); // disable all output processing
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t.c_cc[VMIN] = 1; // read() returns after 1 byte
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t.c_cc[VTIME] = 0; // no timeout
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t) == -1) {
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perror("tcsetattr");
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exit(1);
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}
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}
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int main(void)
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{
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// TODO: switch to sigaction
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signal(SIGWINCH, sigwinch_handler);
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signal(SIGINT, SIG_IGN);
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enable_raw_mode();
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printf(SHOW_ALTERNATIVE_SCREEN);
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printf(HIDE_CURSOR);
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printf(MOVE_CURSOR_HOME);
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fflush(stdout);
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get_terminal_size(&state);
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char c;
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while (true) {
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ssize_t n = read(STDIN_FILENO, &c, 1);
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if (n == -1) continue;
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if (c == 'q') break;
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switch (c) {
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case 'h':
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printf("%s%s", MOVE_CURSOR_LEFT, MOVE_CURSOR_LEFT);
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break;
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case 'j':
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printf("%s%s", MOVE_CURSOR_DOWN, MOVE_CURSOR_LEFT);
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break;
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case 'k':
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printf("%s%s", MOVE_CURSOR_UP, MOVE_CURSOR_LEFT);
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break;
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case 'l':
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break;
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}
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if (c == 'h') printf(MOVE_CURSOR_LEFT);
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if (c == 'j') printf(MOVE_CURSOR_DOWN);
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if (c == 'k') printf(MOVE_CURSOR_UP);
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if (c == 'l') printf(MOVE_CURSOR_RIGHT);
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printf(CLEAR_SCREEN);
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printf("\033[43m \033[0m");
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fflush(stdout);
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}
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tcsetattr(STDIN_FILENO, TCSAFLUSH, &state.original_termios);
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printf(SHOW_NORMAL_SCREEN);
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printf(SHOW_CURSOR);
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fflush(stdout);
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return 0;
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}
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