examples/functions/keep

   1 # From: Seth Chaiklin <psykseth@aau.dk>
   2 # To: chet@ins.CWRU.Edu
   3 # Subject: bash functions (sorta)
   4
   5 #
   6 # keep:
   7 # usage: keep program
   8 # declare the a program should be "kept".  i.e. try to fg a stopped one
   9 # and only when that fails start a fresh program.
  10 #
  11
  12 keep()
  13 {
  14         case $# in
  15         1|2)    ;;
  16         *) echo "usage: keep [alias] program" 1>&2 ; return 1;;
  17         esac
  18
  19         # progname
  20         pn=${1##*/}
  21
  22         # set up an alias for the kept program
  23         if [ $# = 1 ]; then
  24                 alias "$pn=fg $1 2>/dev/null || $1"
  25         else
  26                 alias "$1=fg $2 2>/dev/null || $2"
  27         fi
  28 }
  29
  30 #
  31 # unkeep:
  32 # usage: unkeep program
  33 # unset the alias set up by the keep function
  34 #
  35
  36 unkeep()
  37 {
  38         if [ $# != 1 ]; then
  39                 echo "usage: unkeep program"
  40                 return 2
  41         fi
  42
  43         # unset the alias for the kept program
  44         unalias "${1##*/}"
  45 }
  46
  47 #
  48 # kept:
  49 # lists all kept programs in 'alias: program' form
  50 #
  51
  52 kept()
  53 {
  54         alias | grep "fg.*2>" | sed "s/alias \(.*\)='fg.*||\(.*\)'$/\1:\2/"
  55 }
  56
  57
  58 # some things that should be kept
  59 #keep /usr/local/bin/emacs
  60 #keep e ${EDITOR:-/usr/local/bin/emacs}
  61 #keep edit ${EDITOR:-/usr/local/bin/emacs}
  62 #keep /usr/local/bin/emm