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#define _GNU_SOURCE
#include <X11/XKBlib.h>
#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <unistd.h>
#define MAX_BINDS 256
#define MAX_CMD_LEN 512
#define SOCK_PATH "/tmp/piss.sock"
typedef struct {
unsigned int mod;
KeyCode keycode;
char cmd[MAX_CMD_LEN];
} Binding;
static Display *dpy;
static Window root;
static Binding bindings[MAX_BINDS];
static int bind_count = 0;
unsigned int parse_modifiers(const char *str) {
unsigned int mod = 0;
if (strcasestr(str, "super") || strcasestr(str, "mod4"))
mod |= Mod4Mask;
if (strcasestr(str, "shift"))
mod |= ShiftMask;
if (strcasestr(str, "ctrl") || strcasestr(str, "control"))
mod |= ControlMask;
if (strcasestr(str, "alt") || strcasestr(str, "mod1"))
mod |= Mod1Mask;
return mod;
}
void grab_key(unsigned int mod, KeyCode kc) {
unsigned int numlock = Mod2Mask, capslock = LockMask;
XGrabKey(dpy, kc, mod, root, True, GrabModeAsync, GrabModeAsync);
XGrabKey(dpy, kc, mod | numlock, root, True, GrabModeAsync, GrabModeAsync);
XGrabKey(dpy, kc, mod | capslock, root, True, GrabModeAsync, GrabModeAsync);
XGrabKey(dpy, kc, mod | numlock | capslock, root, True, GrabModeAsync,
GrabModeAsync);
}
void add_binding(char *msg) {
if (bind_count >= MAX_BINDS)
return;
char *sep = strstr(msg, "|||");
if (!sep)
return;
*sep = '\0';
char *combo = msg, *cmd = sep + 3;
char *last_plus = strrchr(combo, '+');
if (!last_plus)
return;
*last_plus = '\0';
char *key_name = last_plus + 1;
while (*key_name == ' ')
key_name++;
KeySym sym = XStringToKeysym(key_name);
if (sym == NoSymbol)
return;
bindings[bind_count].mod = parse_modifiers(combo);
bindings[bind_count].keycode = XKeysymToKeycode(dpy, sym);
strncpy(bindings[bind_count].cmd, cmd, MAX_CMD_LEN - 1);
grab_key(bindings[bind_count].mod, bindings[bind_count].keycode);
bind_count++;
XSync(dpy, False);
}
int client_mode(int retry, char *combo, char *cmd) {
struct sockaddr_un addr = {.sun_family = AF_UNIX};
strncpy(addr.sun_path, SOCK_PATH, sizeof(addr.sun_path) - 1);
while (1) {
int sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) {
if (combo && cmd) {
char buf[MAX_CMD_LEN * 2];
snprintf(buf, sizeof(buf), "%s|||%s", combo, cmd);
write(sock, buf, strlen(buf));
}
close(sock);
return 0;
}
close(sock);
if (!retry)
return 1;
usleep(50000);
}
}
int main(int argc, char *argv[]) {
if (argc >= 2 && strcmp(argv[1], "wait") == 0)
return client_mode(1, NULL, NULL);
if (argc >= 4 && strcmp(argv[1], "bind") == 0)
return client_mode(0, argv[2], argv[3]);
dpy = XOpenDisplay(NULL);
if (!dpy)
return 1;
root = DefaultRootWindow(dpy);
XSelectInput(dpy, root, KeyPressMask);
int serv = socket(AF_UNIX, SOCK_STREAM, 0);
struct sockaddr_un addr = {.sun_family = AF_UNIX};
strncpy(addr.sun_path, SOCK_PATH, sizeof(addr.sun_path) - 1);
unlink(SOCK_PATH);
bind(serv, (struct sockaddr *)&addr, sizeof(addr));
listen(serv, 10);
char path[512];
ssize_t len = readlink("/proc/self/exe", path, sizeof(path) - 1);
if (len != -1) {
path[len] = '\0';
setenv("PISS_BIN", path, 1);
}
if (fork() == 0) {
char *cfg = (argc > 1) ? argv[1] : NULL;
if (!cfg) {
static char def[512];
snprintf(def, 511, "%s/.config/piss/pissrc", getpwuid(getuid())->pw_dir);
cfg = def;
}
// Use execvp so the shebang (#! /usr/bin/lua) is respected
char *args[] = {cfg, NULL};
execvp(cfg, args);
perror("execvp");
exit(1);
}
int xfd = ConnectionNumber(dpy);
while (1) {
fd_set fds;
FD_ZERO(&fds);
FD_SET(xfd, &fds);
FD_SET(serv, &fds);
int max = (xfd > serv) ? xfd : serv;
if (select(max + 1, &fds, NULL, NULL, NULL) > 0) {
if (FD_ISSET(serv, &fds)) {
int cli = accept(serv, NULL, NULL);
char buf[MAX_CMD_LEN * 2] = {0};
if (read(cli, buf, sizeof(buf) - 1) > 0)
add_binding(buf);
close(cli);
}
while (XPending(dpy)) {
XEvent ev;
XNextEvent(dpy, &ev);
if (ev.type == KeyPress) {
unsigned int state = ev.xkey.state & ~(Mod2Mask | LockMask);
for (int i = 0; i < bind_count; i++) {
if (bindings[i].keycode == ev.xkey.keycode &&
bindings[i].mod == state) {
if (fork() == 0) {
setsid();
execl("/bin/sh", "sh", "-c", bindings[i].cmd, NULL);
exit(0);
}
}
}
}
}
}
}
return 0;
}
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