screensaver

   1 #!/bin/sh
   2
   3 cmd_exists () {
   4     if which "$1" >/dev/null 2>&1; then
   5         return 0;
   6     else
   7         return 1;
   8     fi;
   9 }
  10
  11 fork () {
  12     ( "$@" >/dev/null 2>&1 & )
  13 }
  14
  15 cmd_running () {
  16     if pkill -0 -u "$(id -u)" "$1"; then
  17         return 0;
  18     else
  19         return 1;
  20     fi;
  21 }
  22
  23 should_stop () {
  24     if [ "x$1" = "xoff" ] || [ "x$1" = "xstop" ] ; then
  25         return 0;
  26     else
  27         return 1;
  28     fi;
  29 }
  30
  31
  32 if cmd_exists slock && cmd_exists xautolock; then
  33     if cmd_running "xautolock"; then
  34         if should_stop "$1"; then
  35             xautolock -exit;
  36         fi;
  37     else
  38         if ! should_stop "$1"; then
  39             fork xautolock -notifier true -bell 0 -locker slock;
  40         fi;
  41     fi;
  42 elif cmd_exists xscreensaver && [ -e ~/.xscreensaver ]; then
  43     if cmd_running "xscreensaver"; then
  44         if should_stop "$1"; then
  45             xscreensaver-command -exit;
  46         fi;
  47     else
  48         if ! should_stop "$1"; then
  49             fork XENVIRONMENT=~/.xscreensaver /usr/bin/xscreensaver;
  50         fi;
  51     fi;
  52 elif cmd_exists xautolock; then
  53     if cmd_running "xautolock"; then
  54         if should_stop "$1"; then
  55             xautolock -exit;
  56         fi;
  57     else
  58         if ! should_stop "$1"; then
  59             fork xautolock -notifier true -bell 0;
  60         fi;
  61     fi;
  62 fi;