code / scripts

   1 #!/usr/bin/env bash
   2 # Herbstluftwm: Refocus the last-focused window
   3 
   4 herbstclient \
   5   chain \
   6     `# quit existing instances of loop below` \
   7     , emit_hook quit_focuslastwindow \
   8     `# if the key is pressed` \
   9     , keybind Alt-Tab \
  10         `# read the content of the my_lastwin attribute` \
  11         substitute LASTWIN my_lastwin \
  12             `# and jump there` \
  13             jumpto LASTWIN \
  14     `# create necessary attributes, but do not fail if they already exist` \
  15     , silent try new_attr string my_lastwin \
  16     , silent try new_attr string my_curwin \
  17     `# fill them with the current window id` \
  18     , and ,, silent attr clients.focus \
  19           ,, substitute WIN clients.focus.winid set_attr my_curwin WIN \
  20           ,, substitute WIN clients.focus.winid set_attr my_lastwin WIN \
  21 
  22 herbstclient -i '(focus_changed|reload|quit_focuslastwindow)' | \
  23     while read -r h winid t; do
  24         case "$h" in
  25             focus_changed)
  26                 # never feed an 'unfocused' state into the queue
  27                 # if a window is focused, shift the content of my_curwin into
  28                 # my_lastwin. Note that we use $winid here and not the content
  29                 # of clients.focus.winid in order to avoid race conditions.
  30                 [[ "$winid" != "0x0" ]] && \
  31                 herbstclient and \
  32                     , substitute WIN my_curwin set_attr my_lastwin WIN \
  33                     , set_attr my_curwin "$winid"
  34                 ;;
  35             *)  # on any other hook, quit this loop. Note that the idling
  36                 # herbstclient still lives until the next time a hook arrives
  37                 # and then quits because it can not write to stdout anymore
  38                 break ;;
  39         esac
  40     done