#define SETPROP(r, s, p) { \
              .v = (const char *[]){ "/bin/sh", "-c", \
                   "prop=\"$(printf '%b' \"$(xprop -id $1 $2 " \
                   "| sed \"s/^$2(STRING) = //;s/^\\\"\\(.*\\)\\\"$/\\1/\")\" " \
                   "| dmenu -p \"$4\" -w $1)\" && xprop -id $1 -f $3 8s -set $3 \"$prop\"", \
                   "surf-setprop", winid, r, s, p, NULL \
              } \
      }