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/* PTY wrapper for preserving HJKL in Tarmak layouts.
*
* Copyright (c) 2017, Curtis McEnroe <programble@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <err.h>
#include <poll.h>
#include <stdbool.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <sysexits.h>
#include <termios.h>
#include <unistd.h>
#if defined __FreeBSD__
#include <libutil.h>
#elif defined __linux__
#include <pty.h>
#else
#include <util.h>
#endif
static char table[256] = {
['n'] = 'j', ['N'] = 'J', [CTRL('N')] = CTRL('J'),
['e'] = 'k', ['E'] = 'K', [CTRL('E')] = CTRL('K'),
['j'] = 'e', ['J'] = 'E', [CTRL('J')] = CTRL('E'),
['k'] = 'n', ['K'] = 'N', [CTRL('K')] = CTRL('N'),
};
static ssize_t writeAll(int fd, const char *buf, size_t len) {
ssize_t writeLen;
while (0 < (writeLen = write(fd, buf, len))) {
buf += writeLen;
len -= writeLen;
}
return writeLen;
}
static struct termios saveTerm;
static void restoreTerm(void) {
tcsetattr(STDERR_FILENO, TCSADRAIN, &saveTerm);
}
int main(int argc, char *argv[]) {
int error;
if (argc < 2) return EX_USAGE;
error = tcgetattr(STDERR_FILENO, &saveTerm);
if (error) err(EX_IOERR, "tcgetattr");
atexit(restoreTerm);
struct termios raw;
cfmakeraw(&raw);
error = tcsetattr(STDERR_FILENO, TCSADRAIN, &raw);
if (error) err(EX_IOERR, "tcsetattr");
struct winsize window;
error = ioctl(STDERR_FILENO, TIOCGWINSZ, &window);
if (error) err(EX_IOERR, "ioctl(%d, TIOCGWINSZ)", STDERR_FILENO);
int master;
pid_t pid = forkpty(&master, NULL, NULL, &window);
if (pid < 0) err(EX_OSERR, "forkpty");
if (!pid) {
execvp(argv[1], argv + 1);
err(EX_OSERR, "%s", argv[1]);
}
bool enable = true;
struct pollfd fds[2] = {
{ .fd = STDIN_FILENO, .events = POLLIN },
{ .fd = master, .events = POLLIN },
};
while (0 < poll(fds, 2, -1)) {
char buf[4096];
ssize_t len;
if (fds[0].revents) {
len = read(STDIN_FILENO, buf, sizeof(buf));
if (len < 0) err(EX_IOERR, "read(%d)", STDIN_FILENO);
if (len == 1) {
if (buf[0] == CTRL('S')) {
enable = !enable;
continue;
}
unsigned char c = buf[0];
if (enable && table[c]) buf[0] = table[c];
}
len = writeAll(master, buf, len);
if (len < 0) err(EX_IOERR, "write(%d)", master);
}
if (fds[1].revents) {
len = read(master, buf, sizeof(buf));
if (len < 0) err(EX_IOERR, "read(%d)", master);
len = writeAll(STDOUT_FILENO, buf, len);
if (len < 0) err(EX_IOERR, "write(%d)", STDOUT_FILENO);
}
int status;
pid_t dead = waitpid(pid, &status, WNOHANG);
if (dead < 0) err(EX_OSERR, "waitpid(%d)", pid);
if (dead) return WIFEXITED(status) ? WEXITSTATUS(status) : EX_SOFTWARE;
}
err(EX_IOERR, "poll");
}
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