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#!/depot/path/expect -f
# 99 bottles of beer on the wall, Expect-style
# Author: Don Libes <libes@nist.gov>
# Unlike programs (http://www.ionet.net/~timtroyr/funhouse/beer.html)
# which merely print out the 99 verses, this one SIMULATES a human
# typing the beer song. Like a real human, typing mistakes and timing
# becomes more erratic with each beer - the final verse is barely
# recognizable and it is really like watching a typist hunt and peck
# while drunk.
# Finally, no humans actually sing all 99 verses - particularly when
# drunk. In reality, they occasionally lose their place (or just get
# bored) and skip verses, so this program does likewise.
# Because the output is timed, just looking at the output isn't enough
# - you really have to see the program running to appreciate it.
# Nonetheless, for convenience, output from one run (it's different
# every time of course) can be found in the file beer.exp.out
# But it won't show the erratic timing; you have to run it for that.
# For an even fancier version, see http://expect.nist.gov/scripts/superbeer.exp
proc bottles {i} {
return "$i bottle[expr {$i!=1?"s":""}] of beer"
}
proc line123 {i} {
out $i "[bottles $i] on the wall,\n"
out $i "[bottles $i],\n"
out $i "take one down, pass it around,\n"
}
proc line4 {i} {
out $i "[bottles $i] on the wall.\n\n"
}
proc out {i s} {
foreach c [split $s ""] {
# don't touch punctuation; just looks too strange if you do
if {[regexp "\[,. \n\]" $c]} {
append d $c
continue
}
# keep first couple of verses straight
if {$i > 97} {append d $c; continue}
# +3 prevents it from degenerating too far
# /2 makes it degenerate faster though
set r [rand [expr {$i/2+3}]]
if {$r} {append d $c; continue}
# do something strange
switch [rand 3] {
0 {
# substitute another letter
if {[regexp \[aeiou\] $c]} {
# if vowel, substitute another
append d [string index aeiou [rand 5]]
} elseif {[regexp \[0-9\] $c]} {
# if number, substitute another
append d [string index 123456789 [rand 9]]
} else {
# if consonant, substitute another
append d [string index bcdfghjklmnpqrstvwxyz [rand 21]]
}
} 1 {
# duplicate a letter
append d $c$c
} 2 {
# drop a letter
}
}
}
set arr1 [expr {.4 - ($i/333.)}]
set arr2 [expr {.6 - ($i/333.)}]
set shape [expr {log(($i+2)/2.)+.1}]
set min 0
set max [expr {6-$i/20.}]
set send_human "$arr1 $arr2 $shape $min $max"
send -h $d
}
set _ran [pid]
proc rand {m} {
global _ran
set period 259200
set _ran [expr {($_ran*7141 + 54773) % $period}]
expr {int($m*($_ran/double($period)))}
}
for {set i 99} {$i>0} {} {
line123 $i
incr i -1
line4 $i
# get bored and skip ahead
if {$i == 92} {
set i [expr {52+[rand 5]}]
}
if {$i == 51} {
set i [expr {12+[rand 5]}]
}
if {$i == 10} {
set i [expr {6+[rand 3]}]
}
}
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