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-#!/bin/bash
-# ash -- "Adventure shell"
-# last edit: 86/04/21 D A Gwyn
-# SCCS ID: @(#)ash.sh 1.4
-
-OPATH=$PATH
-
-ask()
-{
- echo -n "$@" '[y/n] '
- read ans
-
- case "$ans" in
- y*|Y*)
- return 0
- ;;
- *)
- return 1
- ;;
- esac
-}
-
-CAT=${PAGER:-more}
-
-ash_inst()
-{
- cat <<- EOF
-
- Instructions for the Adventure shell
-
- Welcome to the Adventure shell! In this exploration of the UNIX file
- system, I will act as your eyes and hands. As you move around, I will
- describe whatever is visible and will carry out your commands. The
- general form of a command is
- Verb Object Extra_stuff.
- Most commands pay no attention to the "Extra_stuff", and many do not
- need an "Object". A typical command is
- get all
- which picks up all files in the current "room" (directory). You can
- find out what you are carrying by typing the command
- inventory
- The command "help" results in a full description of all commands that I
- understand. To quit the Adventure shell, type
- quit
-
- There are UNIX monsters lurking in the background. These are also
- known as "commands with arguments".
-
- Good luck!
- EOF
-}
-
-ash_help()
-{
-echo "I understand the following commands (synonyms in parentheses):"
-echo ""
-
-echo "change OBJECT to NEW_NAME changes the name of the object"
-echo "clone OBJECT as NEW_NAME duplicates the object"
-echo "drop OBJECTS leaves the objects in the room"
-echo "enter (go) PASSAGE takes the labeled passage"
-echo "examine OBJECTS describes the objects in detail"
-echo "feed OBJECT to MONSTER stuffs the object into a UNIX monster"
-echo "get (take) OBJECTS picks up the specified objects"
-echo "gripe (bug) report a problem with the Adventure shell"
-echo "help prints this summary"
-echo "inventory (i) tells what you are carrying"
-echo "kill (destroy) OBJECTS destroys the objects"
-echo "look (l) describes the room, including hidden objects"
-echo "open (read) OBJECT shows the contents of an object"
-echo "quit (exit) leaves the Adventure shell"
-echo "resurrect OBJECTS attempts to restore dead objects"
-echo "steal OBJECT from MONSTER obtains the object from a UNIX monster"
-echo "throw OBJECT at daemon feeds the object to the printer daemon"
-echo "up takes the overhead passage"
-echo "wake MONSTER awakens a UNIX monster"
-echo "where (w) tells you where you are"
-echo "xyzzy moves you to your home"
-}
-
-MAINT=chet@ins.cwru.edu
-
-PATH=/usr/ucb:/bin:/usr/bin:/usr/local/bin:.
-export PATH
-
-trap 'echo Ouch!' 2 3
-#trap '' 18 # disable Berkeley job control
-
-ash_lk(){ echo " $1 " | fgrep " $2 " >&- 2>&-; }
-ash_pr(){ echo $* | tr ' ' '\012' | pr -5 -t -w75 -l$[ ( $# + 4 ) / 5 ]; }
-ash_rm(){ echo " $1 " | sed -e "s/ $2 / /" -e 's/^ //' -e 's/ $//'; }
-
-# enable history, bang history expansion, and emacs editing
-set -o history
-set -o histexpand
-set -o emacs
-
-cd
-LIM=.limbo # $HOME/$LIM contains "destroyed" objects
-mkdir $LIM >&- 2>&-
-KNAP=.knapsack # $HOME/$KNAP contains objects being "carried"
-if [ ! -d $KNAP ]
-then mkdir $KNAP >&- 2>&-
- if [ $? = 0 ]
- then echo 'You found a discarded empty knapsack.'
- else echo 'You have no knapsack to carry things in.'
- exit 1
- fi
-else echo 'One moment while I peek in your old knapsack...'
-fi
-
-kn=`echo \`ls -a $KNAP | sed -e '/^\.$/d' -e '/^\.\.$/d'\``
-
-if ask 'Welcome to the Adventure shell! Do you need instructions?'
-then
- ash_inst
- echo -n 'Type a newline to continue: '
- read
-fi
-
-wiz=false
-cha=false
-prev=$LIM
-while :
-do room=`pwd`
- if [ $room != $prev ]
- then if [ $room = $HOME ]
- then echo 'You are in your own home.'
- else echo "You have entered $room."
- fi
- exs=
- obs=
- hexs=
- hobs=
- f=false
- for i in `ls -a`
- do case $i in
- .|..) ;;
- .*) if [ -f $i ]
- then hobs="$hobs $i"
- elif [ -d $i ]
- then hexs="$hexs $i"
- else f=true
- fi
- ;;
- *) if [ -f $i ]
- then obs="$obs $i"
- elif [ -d $i ]
- then exs="$exs $i"
- else f=true
- fi
- ;;
- esac
- done
- if [ "$obs" ]
- then echo 'This room contains:'
- ash_pr $obs
- else echo 'The room looks empty.'
- fi
- if [ "$exs" ]
- then echo 'There are exits labeled:'
- ash_pr $exs
- echo 'as well as a passage overhead.'
- else echo 'There is a passage overhead.'
- fi
- if sh -c $f
- then echo 'There are shadowy figures in the corner.'
- fi
- prev=$room
- fi
-
- read -e -p '-advsh> ' verb obj x # prompt is '-advsh> '
- if [ $? != 0 ]
- then verb=quit # EOF
- fi
-
- case $verb in
- change) if [ "$obj" ]
- then if ash_lk "$obs $hobs" "$obj"
- then set -- $x
- case "$1" in
- to) if [ "$2" ]
- then if [ -f $2 ]
- then echo "You must destroy $2 first."
- set --
- fi
- if [ "$2" ]
- then if mv $obj $2 >&- 2>&-
- then echo "The $obj shimmers and turns into $2."
- obs=`ash_rm "$2 $obs" "$obj"`
- else echo "There is a cloud of smoke but the $obj is unchanged."
- fi
- fi
- else echo 'To what?'
- fi
- ;;
- *) echo "Change $obj to what?"
- ;;
- esac
- else if ash_lk "$kn" "$obj"
- then echo 'You must drop it first.'
- else echo "I see no $obj here."
- fi
- fi
- else echo 'Change what?'
- fi
- ;;
- clone) if [ "$obj" ]
- then if ash_lk "$obs $hobs" "$obj"
- then if [ ! -r $obj ]
- then echo "The $obj does not wish to be cloned."
- else set -- $x
- case "$1" in
- as) if [ "$2" ]
- then if [ -f $2 ]
- then echo "You must destroy $2 first."
- else if cp $obj $2 >&- 2>&-
- then echo "Poof! When the smoke clears, you see the new $2."
- obs="$obs $2"
- else echo 'You hear a dull thud but no clone appears.'
- fi
- fi
- else echo 'As what?'
- fi
- ;;
- *) echo "Clone $obj as what?"
- ;;
- esac
- fi
- else if ash_lk "$kn" "$obj"
- then echo 'You must drop it first.'
- else echo "I see no $obj here."
- fi
- fi
- else echo 'Clone what?'
- fi
- ;;
- drop) if [ "$obj" ]
- then for it in $obj $x
- do if ash_lk "$kn" "$it"
- then if [ -w $it ]
- then echo "You must destroy $it first."
- else if mv $HOME/$KNAP/$it $it >&- 2>&-
- then echo "$it: dropped."
- kn=`ash_rm "$kn" "$it"`
- obs=`echo $it $obs`
- else echo "The $it is caught in your knapsack."
- fi
- fi
- else echo "You're not carrying the $it!"
- fi
- done
- else echo 'Drop what?'
- fi
- ;;
- enter|go) if [ "$obj" ]
- then if [ $obj != up ]
- then if ash_lk "$exs $hexs" "$obj"
- then if [ -x $obj ]
- then if cd $obj
- then echo 'You squeeze through the passage.'
- else echo "You can't go that direction."
- fi
- else echo 'An invisible force blocks your way.'
- fi
- else echo 'I see no such passage.'
- fi
- else if cd ..
- then echo 'You struggle upwards.'
- else echo "You can't reach that high."
- fi
- fi
- else echo 'Which passage?'
- fi
- ;;
- examine) if [ "$obj" ]
- then if [ $obj = all ]
- then $obj=`echo $obs $exs`
- x=
- fi
- for it in $obj $x
- do if ash_lk "$obs $hobs $exs $hexs" "$it"
- then echo "Upon close inspection of the $it, you see:"
- ls -ld $it 2>&-
- if [ $? != 0 ]
- then echo "-- when you look directly at the $it, it vanishes."
- fi
- else if ash_lk "$kn" "$it"
- then echo 'You must drop it first.'
- else echo "I see no $it here."
- fi
- fi
- done
- else echo 'Examine what?'
- fi
- ;;
- feed) if [ "$obj" ]
- then if ash_lk "$obs $hobs" "$obj"
- then set -- $x
- case "$1" in
- to) if [ "$2" ]
- then shift
- if PATH=$OPATH $* <$obj 2>&-
- then echo "The $1 monster devours your $obj."
- if rm -f $obj >&- 2>&-
- then obs=`ash_rm "$obs" "$obj"`
- else echo 'But he spits it back up.'
- fi
- else echo "The $1 monster holds his nose in disdain."
- fi
- else echo 'To what?'
- fi
- ;;
- *) echo "Feed $obj to what?"
- ;;
- esac
- else if ash_lk "$kn" "$obj"
- then echo 'You must drop it first.'
- else echo "I see no $obj here."
- fi
- fi
- else echo 'Feed what?'
- fi
- ;;
- get|take) if [ "$obj" ]
- then if [ $obj = all ]
- then obj="$obs"
- x=
- fi
- for it in $obj $x
- do if ash_lk "$obs $hobs" "$it"
- then if ash_lk "$kn" "$it"
- then echo 'You already have one.'
- else if mv $it $HOME/$KNAP/$it >&- 2>&-
- then echo "$it: taken."
- kn="$it $kn"
- obs=`ash_rm "$obs" "$it"`
- else echo "The $it is too heavy."
- fi
- fi
- else echo "I see no $it here."
- fi
- done
- else echo 'Get what?'
- fi
- ;;
- gripe|bug) echo 'Please describe the problem and your situation at the time it failed.\nEnd the bug report with a line containing just a Ctrl-D.'
- cat | mail $MAINT -s 'ash bug'
- echo 'Thank you!'
- ;;
- help) ash_help
- ;;
- inventory|i) if [ "$kn" ]
- then echo 'Your knapsack contains:'
- ash_pr $kn
- else echo 'You are poverty-stricken.'
- fi
- ;;
- kill|destroy) if [ "$obj" ]
- then if [ $obj = all ]
- then x=
- if ask "Do you really want to attempt to $verb them all?"
- then obj=`echo $obs`
- else echo 'Chicken!'
- obj=
- fi
- fi
- for it in $obj $x
- do if ash_lk "$obs $hobs" "$it"
- then if mv $it $HOME/$LIM <&- >&- 2>&-
- then if [ $verb = kill ]
- then echo "The $it cannot defend himself; he dies."
- else echo "You have destroyed the $it; it vanishes."
- fi
- obs=`ash_rm "$obs" "$it"`
- else if [ $verb = kill ]
- then echo "Your feeble blows are no match for the $it."
- else echo "The $it is indestructible."
- fi
- fi
- else if ash_lk "$kn" "$it"
- then echo "You must drop the $it first."
- found=false
- else echo "I see no $it here."
- fi
- fi
- done
- else echo 'Kill what?'
- fi
- ;;
- look|l) obs=`echo $obs $hobs`
- hobs=
- if [ "$obs" ]
- then echo 'The room contains:'
- ash_pr $obs
- else echo 'The room is empty.'
- fi
- exs=`echo $exs $hexs`
- hexs=
- if [ "$exs" ]
- then echo 'There are exits plainly labeled:'
- ash_pr $exs
- echo 'and a passage directly overhead.'
- else echo 'The only exit is directly overhead.'
- fi
- ;;
- magic) if [ "$obj" = mode ]
- then if sh -c $cha
- then echo 'You had your chance and you blew it.'
- else if ask 'Are you a wizard?'
- then echo -n 'Prove it! Say the magic word: '
- read obj
- if [ "$obj" = armadillo ]
- then echo 'Yes, master!!'
- wiz=true
- else echo "Homie says: I don't think so"
- cha=true
- fi
- else echo "I didn't think so."
- fi
- fi
- else echo 'Nice try.'
- fi
- ;;
- open|read) if [ "$obj" ]
- then if ash_lk "$obs $hobs" "$obj"
- then if [ -r $obj ]
- then if [ -s $obj ]
- then echo "Opening the $obj reveals:"
- $CAT < $obj
- if [ $? != 0 ]
- then echo '-- oops, you lost the contents!'
- fi
- else echo "There is nothing inside the $obj."
- fi
- else echo "You do not have the proper tools to open the $obj."
- fi
- else if ash_lk "$kn" "$obj"
- then echo 'You must drop it first.'
- found=false
- else echo "I see no $obj here."
- fi
- fi
- else echo 'Open what?'
- fi
- ;;
- quit|exit) if ask 'Do you really want to quit now?'
- then if [ "$kn" ]
- then echo 'The contents of your knapsack will still be there next time.'
- fi
- rm -rf $HOME/$LIM
- echo 'See you later!'
- exit 0
- fi
- ;;
- resurrect) if [ "$obj" ]
- then for it in $obj $x
- do if ash_lk "$obs $hobs" "$it"
- then echo "The $it is already alive and well."
- else if mv $HOME/$LIM/$it $it <&- >&- 2>&-
- then echo "The $it staggers to his feet."
- obs=`echo $it $obs`
- else echo "There are sparks but no $it appears."
- fi
- fi
- done
- else echo 'Resurrect what?'
- fi
- ;;
- steal) if [ "$obj" ]
- then if ash_lk "$obs $hobs" "$obj"
- then echo 'There is already one here.'
- else set -- $x
- case "$1" in
- from) if [ "$2" ]
- then shift
- if PATH=$OPATH $* >$obj 2>&-
- then echo "The $1 monster drops the $obj."
- obs=`echo $obj $obs`
- else echo "The $1 monster runs away as you approach."
- rm -f $obj >&- 2>&-
- fi
- else echo 'From what?'
- fi
- ;;
- *) echo "Steal $obj from what?"
- ;;
- esac
- fi
- else echo 'Steal what?'
- fi
- ;;
- throw) if [ "$obj" ]
- then if ash_lk "$obs $hobs" "$obj"
- then set -- $x
- case "$1" in
- at) case "$2" in
- daemon) if sh -c "lpr -r $obj"
- then echo "The daemon catches the $obj, turns it into paper,\nand leaves it in the basket."
- obs=`ash_rm "$obs" "$obj"`
- else echo "The daemon is nowhere to be found."
- fi
- ;;
- *) echo 'At what?'
- ;;
- esac
- ;;
- *) echo "Throw $obj at what?"
- ;;
- esac
- else if ash_lk "$kn" "$obj"
- then echo 'It is in your knapsack.'
- found=false
- else echo "I see no $obj here."
- fi
- fi
- else echo 'Throw what?'
- fi
- ;;
- u|up) if cd ..
- then echo 'You pull yourself up a level.'
- else echo "You can't reach that high."
- fi
- ;;
- wake) if [ "$obj" ]
- then echo "You awaken the $obj monster:"
- PATH=$OPATH $obj $x
- echo 'The monster slithers back into the darkness.'
- else echo 'Wake what?'
- fi
- ;;
- w|where) echo "You are in $room."
- ;;
- xyzzy) if cd
- then echo 'A strange feeling comes over you.'
- else echo 'Your spell fizzles out.'
- fi
- ;;
- *) if [ "$verb" ]
- then if sh -c $wiz
- then PATH=$OPATH $verb $obj $x
- else echo "I don't know how to \"$verb\"."
- echo 'Type "help" for assistance.'
- fi
- else echo 'Say something!'
- fi
- ;;
- esac
-done