/* [ʞ] safekill.c <c.hale.su/lexi/util>
* ~ lexi hale <lexi@hale.su>
* $ cc -Ofast safekill.c -lX11 -lc -osafekill
* a utility to make it harder to accidentally nuke
* important windows on i3wm or whatever.
* released under affero general public license */
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
typedef enum { false, true } bool;
char* isvital(char* str) {
start: // tail calls for dipshits
if (*str != '{') {
if (*str == 0) return 0;
++str; goto start;
} else {
if (str[1] == 'V' && str[2] == '}')
return str;
else { ++str; goto start; }
}
}
int main(const int argc, const char** argv) {
Display *display;
Window focus;
int revert;
bool active;
enum { vitalize, devitalize, hardkill, softkill } op;
if (argc > 3) goto usage;
if (argc == 1)
op = softkill, active = true;
else {
if (argc == 2) active = true;
else active = false;
if (argv[1][0] == '-' && argv[1][2] == 0) { // opt is short switch
switch (argv[1][1]) { // opt char
// make window mission-critical
case 'v': op = vitalize; break;
// make window acceptable loss
case 'c': op = devitalize; break;
// liquidate by any means necessary
case 'q': op = hardkill; break;
// with all due respect sir what the fuck
default: goto usage;
}
} else goto usage;
}
display = XOpenDisplay(NULL);
if (active) {
XGetInputFocus(display, &focus, &revert);
} else {
unsigned long temp = strtoul(argv[2], NULL, 0);
if (errno == EINVAL || errno == ERANGE) goto usage;
if (temp == 0) goto usage;
focus = (Window)temp;
}
if(op == hardkill) {
XDestroyWindow(display,focus);
XSync(display,false);
return 0;
}
XClassHint xclh;
if (XGetClassHint(display,focus,&xclh)) {
char* v;
if(v = isvital(xclh.res_class)) {
if (op == vitalize) return 0; // nothing need be done
else if (op == devitalize) {
strcpy(v, v+3);
XSetClassHint(display,focus,&xclh);
XSync(display,false);
} else if (op == softkill) {
printf("softkill forbidden\n");
return 1; // ACCESS DENIED
}
} else {
if (op == vitalize) {
size_t sz=strlen(xclh.res_class); // TODO: remove double-walk
xclh.res_class=realloc(xclh.res_class, sz+4);
xclh.res_class[sz]='{';
xclh.res_class[sz+1]='V';
xclh.res_class[sz+2]='}';
xclh.res_class[sz+3]=0;
XSetClassHint(display,focus,&xclh);
XSync(display,false);
} else if (op == devitalize) return 0;
else if (op == softkill) {
// ice that motherfucker
XDestroyWindow(display,focus);
XSync(display,false);
return 3;
}
}
} else {
printf("\x1b[1merror:\x1b[m bad window\n");
goto usage;
}
return 0;
usage:
#define info "\x1b[34m-- "
#define param "\x1b[32m"
#define eol "\x1b[m\n"
#define bold "\x1b[1m"
#define nl " "
printf(bold "usage:\x1b[0m %s " " " info "kill active window if non-vital" eol
nl "%1$s -v " param "[id] " info "make [id] or active window vital" eol
nl "%1$s -c " param "[id] " info "clear vital flag on [id] or active window" eol
nl "%1$s -q " param "[id] " info "'emergency' kill w/o reference to vital flag" eol,
argv[0]);
return 1;
}