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#include <X11/XKBlib.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
char* getActiveLayout(char* names, unsigned char active) {
int i;
for (i = 0; names[i]; i++) {
if (names[i] == '+') {
if (active <= 0) {
int j = ++i;
for (; names[j] && names[j] != '+' && names[j] != ':'; j++);
char* ret = malloc(j - i + 1);
strncpy(ret, names + i, j - i);
ret[j - i] = '\0';
return ret;
} else {
active--;
}
}
}
return NULL;
}
int main(void) {
int evCode, errRet, rsnRet;
int maj = XkbMajorVersion;
int min = XkbMinorVersion;
Display* disp = XkbOpenDisplay("", &evCode, &errRet, &maj, &min, &rsnRet);
if (disp == NULL) {
fprintf(stderr,"Failed to open display, is X running?\n");
exit(1);
}
// State
XkbStatePtr state = calloc(1, sizeof(XkbStateRec));
XkbGetState(disp, 0x100, state);
// Names
XkbDescPtr desc = XkbAllocKeyboard();
XkbGetNames(disp, XkbSymbolsNameMask, desc);
Atom symNameAtom = desc->names->symbols;
char* layouts = XGetAtomName(disp, symNameAtom);
printf("%s\n", getActiveLayout(layouts, state->group));
unsigned int mask = XkbStateNotifyMask;
XkbSelectEvents(disp, XkbUseCoreKbd, mask, mask);
XkbEvent event;
while (1) {
XNextEvent(disp, &event.core);
if (event.state.changed & 0x90)
printf("%s\n", getActiveLayout(layouts, event.state.group));
}
}
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