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#!/usr/bin/env bash
# pipes.sh: Animated pipes terminal screensaver.
#
# This modified version is maintained at:
#
# https://github.com/livibetter/pipes.sh
# options:
# s = straight [5-15]
# f = rate [20-100]
# t = style [0-5]
# r = ttl
VERSION=0.1.0
M=32768
p=1
f=75 s=13 r=2000 t=0
w=$(tput cols) h=$(tput lines)
# ab -> idx = a*4 + b
# 0: up, 1: right, 2: down, 3: left
# 00 means going up , then going up -> ┃
# 12 means going right, then going down -> ┓
sets=(
"┃┏ ┓┛━┓ ┗┃┛┗ ┏━"
"│╭ ╮╯─╮ ╰│╯╰ ╭─"
"│┌ ┐┘─┐ └│┘└ ┌─"
"║╔ ╗╝═╗ ╚║╝╚ ╔═"
"|+ ++-+ +|++ +-"
"|/ \/-\ \|/\ /-"
)
v=()
RNDSTART=0
NOCOLOR=0
OPTIND=1
while getopts "p:t:f:s:r:RChv" arg; do
case $arg in
p) ((p=(OPTARG>0)?OPTARG:p));;
t) ((OPTARG>=0 && OPTARG<${#sets[@]})) && V+=($OPTARG);;
f) ((f=(OPTARG>19 && OPTARG<101)?OPTARG:f));;
s) ((s=(OPTARG>4 && OPTARG<16 )?OPTARG:s));;
r) ((r=(OPTARG>=0)?OPTARG:r));;
R) RNDSTART=1;;
C) NOCOLOR=1;;
h) echo -e "Usage: $(basename $0) [OPTION]..."
echo -e "Animated pipes terminal screensaver.\n"
echo -e " -p [1-]\tnumber of pipes (D=1)."
echo -e " -t [0-$((${#sets[@]} - 1))]\ttype of pipes, can be used more than once (D=0)."
echo -e " -f [20-100]\tframerate (D=75)."
echo -e " -s [5-15]\tprobability of a straight fitting (D=13)."
echo -e " -r LIMIT\treset after x characters, 0 if no limit (D=2000)."
echo -e " -R \t\trandom starting point."
echo -e " -C \t\tno color."
echo -e " -h\t\thelp (this screen)."
echo -e " -v\t\tprint version number.\n"
exit 0;;
v) echo "$(basename -- "$0") $VERSION"
exit 0
esac
done
# set default values if not by options
((${#V[@]})) || V=(0)
# Attempt to workaround for Bash versions < 4, such as 3.2 on Mac:
# https://gist.github.com/livibetter/4689307/#comment-892368
# Untested--in conduction of using shebang `env bash`--should fall back to
# `sleep`
printf -v SLEEP "read -t0.0$((1000/f)) -n 1"
if $SLEEP &>/dev/null; (($? != 142)); then
printf -v SLEEP "sleep 0.0$((1000/f))"
fi
cleanup() {
# clear up standard input
read -t 0 && cat </dev/stdin>/dev/null
tput rmcup
tput cnorm
stty echo
exit 0
}
trap cleanup SIGHUP SIGINT SIGTERM
for (( i=1; i<=p; i++ )); do
c[i]=$((i%8)) n[i]=0 l[i]=0
((x[i]=RNDSTART==1?RANDOM*w/32768:w/2))
((y[i]=RNDSTART==1?RANDOM*h/32768:h/2))
v[i]=${V[${#V[@]} * RANDOM / M]}
done
stty -echo
tput smcup
tput reset
tput civis
# any key press exits the loop and this script
while $SLEEP; (($? > 128)) || [[ $SLEEP = sleep* ]] && (($? == 0)); do
for (( i=1; i<=p; i++ )); do
# New position:
((${l[i]}%2)) && ((x[i]+=-${l[i]}+2,1)) || ((y[i]+=${l[i]}-1))
# Loop on edges (change color on loop):
((${x[i]}>w||${x[i]}<0||${y[i]}>h||${y[i]}<0)) && ((c[i]=RANDOM%8, v[i]=V[${#V[@]}*RANDOM/M]))
((x[i]=(x[i]+w)%w))
((y[i]=(y[i]+h)%h))
# New random direction:
((n[i]=RANDOM%s-1))
((n[i]=(${n[i]}>1||${n[i]}==0)?${l[i]}:${l[i]}+${n[i]}))
((n[i]=(${n[i]}<0)?3:${n[i]}%4))
# Print:
tput cup ${y[i]} ${x[i]}
[[ $NOCOLOR == 0 ]] && echo -ne "\033[1;3${c[i]}m"
echo -n "${sets[v[i]]:l[i]*4+n[i]:1}"
l[i]=${n[i]}
done
((r>0 && t*p>=r)) && tput reset && tput civis && t=0 || ((t++))
done
cleanup
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