misc/llpp.inotify

   1 #!/bin/sh
   2 # This wrapper provides automatic reloading on file modifications
   3 # to the pdfviewer llpp via inotify.
   4
   5 # Prepare parameters.
   6 cd `dirname $1`
   7 pdf=`basename $1`
   8 shift
   9 passthrough="$@"
  10
  11 # Return with an error if the given file does not exist.
  12 if [ ! -e $pdf ]; then
  13     echo "$pdf: No such file or directory"
  14     exit 1
  15 fi
  16
  17 # Start llpp with the given file.
  18 llpp $pdf $passthrough &
  19
  20 # Track the PID of the llpp instance.
  21 pid_llpp=$!
  22
  23 # Kill the llpp instance if the shell script terminates.
  24 trap "kill ${pid_llpp}" SIGINT SIGTERM SIGQUIT SIGKILL
  25
  26 # Watch for changes in the directory of the given file. This is necessary
  27 # to recieve events after the file was deleted.
  28 inotifywait -m -e close_write "$PWD" -q | while read dir ev file; do
  29     # Only refresh on events of the file in question and if this file exists.
  30     if [ "$file" = "$pdf" ] && [ -e "$pdf" ]; then
  31         kill -HUP $pid_llpp
  32     fi
  33 done &
  34
  35 # If llpp terminates kill the inotifywait process.
  36 wait $pid_llpp
  37 pkill -P $$
  38 cd - > /dev/null