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#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <X11/Xutil.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
typedef struct Key {
char *command;
unsigned int mod;
KeySym keysym;
} Key;
// A horrible hack.
struct Key * parse_key(char *shortcut, char *command) {
Key *key = malloc(sizeof(key));
if(key == NULL) {
fprintf(stderr, "could not allocate keys\n");
exit(EXIT_FAILURE);
}
key->command = command;
key->mod = 0;
size_t i = 0;
char *token;
char **tokens = malloc(sizeof(char *) * 16);
size_t token_nb = 0;
int key_set = 0;
int mod_set = 0;
// load our tokens
while ((token = strsep(&shortcut, "+")) != NULL) {
tokens[token_nb] = token;
token_nb++;
}
if(token_nb != 0) {
// Modifiers
for(i = 0; i < token_nb; i++) {
// if it's a regular key
if(strlen(tokens[i]) == 1) {
if(key_set) {
return NULL;
}
key->keysym = XStringToKeysym(tokens[token_nb - 1]);
key_set = 1;
}
// if it's a mod key
else {
int mask = 0;
if(strcmp(tokens[i], "control") == 0)
mask = ControlMask;
else if(strcmp(tokens[i], "shift") == 0)
mask = ShiftMask;
else if(strcmp(tokens[i], "mod1") == 0)
mask = Mod1Mask;
else if(strcmp(tokens[i], "mod2") == 0)
mask = Mod2Mask;
else if(strcmp(tokens[i], "mod3") == 0)
mask = Mod3Mask;
else if(strcmp(tokens[i], "mod4") == 0)
mask = Mod4Mask;
else
return NULL;
if(mask) {
key->mod = key->mod | mask ;
mod_set = 1;
}
else {
return NULL;
}
}
}
}
if(key_set && mod_set) {
return(key);
}
else {
free(key);
return NULL;
}
}
struct Key **load_hotkeys(FILE *fh, size_t *key_len) {
char line[4096];
int line_nb = 1;
size_t realloc_size = 1;
*key_len = 0;
struct Key **keys = malloc(sizeof(struct Key **));
if(keys == NULL) {
fprintf(stderr, "could not allocate keys\n");
return NULL;
}
while((fgets(line, 4096, fh)) != NULL) {
int res;
int error = 0;
char *shortcut, *command;
Key *key;
res = sscanf(line, "%ms %m[^\n]+", &shortcut, &command);
if(res == 2) {
key = parse_key(shortcut, command);
}
else {
error = 1;
}
if(error)
fprintf(stderr, "Error:could not parse line %d: %s\n", line_nb, line);
else {
keys[*key_len] = key;
*key_len = *key_len + 1;
realloc(keys, sizeof(struct Key *) * realloc_size);
realloc_size++;
if(keys == NULL) {
fprintf(stderr, "could not realloc keys\n");
exit(EXIT_FAILURE);
}
}
line_nb++;
}
if(*key_len != 0)
return keys;
return NULL;
}
void wait_for_input(Display* dpy, Window root, struct Key **hotkeys, size_t len) {
size_t i = 0;
XSelectInput(dpy, root, KeyPressMask );
while(1) {
XEvent ev;
XNextEvent(dpy, &ev);
if(ev.type == KeyPress) {
XKeyEvent *kev = &ev.xkey;
KeySym keysym = XKeycodeToKeysym(dpy, (KeyCode)kev->keycode, 0);
for(i = 0; i < len; i++) {
if(keysym == hotkeys[i]->keysym && hotkeys[i]->mod == kev->state) {
printf("executing '%s'\n", hotkeys[i]->command);
system(hotkeys[i]->command);
}
}
}
}
}
int main(int argc, char **argv) {
Display* dpy = XOpenDisplay(0);
Window root = DefaultRootWindow(dpy);
unsigned int i = 0;
FILE *config_fh = NULL;
char *config_fn;
size_t len = 0;
struct Key **hotkeys = NULL;
if(argc == 1) {
asprintf(&config_fn, "%s%s", getenv("HOME"), "/.hotkeyrc");
config_fh = fopen(config_fn, "r");
}
else if (argc == 2) {
config_fh = fopen(argv[1], "r");
config_fn = argv[1];
}
else {
fprintf(stderr, "usage: hotkeys config_file (default is ~/.hotkeyrc)\n");
exit(EXIT_FAILURE);
}
if(config_fh == NULL) {
fprintf(stderr, "could not open %s\n", config_fn);
exit(EXIT_FAILURE);
}
hotkeys = load_hotkeys(config_fh, &len);
if(hotkeys == NULL) {
fprintf(stderr, "Could not load any keys from %s. quitting...\n", config_fn);
exit(EXIT_FAILURE);
}
for(i = 0; i < len; i++) {
XGrabKey(dpy, XKeysymToKeycode(dpy,hotkeys[i]->keysym), hotkeys[i]->mod, root, False, GrabModeAsync, GrabModeAsync);
}
wait_for_input(dpy, root, hotkeys, len);
XCloseDisplay(dpy);
return 0;
}
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