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