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#!/usr/bin/env bash
# pipes.sh: Animated pipes terminal screensaver.
#
# This modified version is maintained at:
#
# https://github.com/pipeseroni/pipes.sh
VERSION=1.2.0
M=32768
p=1
f=75 s=13 r=2000 t=0
w=80 h=24
resize() {
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=(
"┃┏ ┓┛━┓ ┗┃┛┗ ┏━"
"│╭ ╮╯─╮ ╰│╯╰ ╭─"
"│┌ ┐┘─┐ └│┘└ ┌─"
"║╔ ╗╝═╗ ╚║╝╚ ╔═"
"|+ ++-+ +|++ +-"
"|/ \/-\ \|/\ /-"
".. .... .... .."
".o oo.o o.oo o."
"-\ /\|/ /-\/ \|" # railway
"╿┍ ┑┚╼┒ ┕╽┙┖ ┎╾" # knobby pipe
)
v=()
RNDSTART=0
BOLD=1
NOCOLOR=0
OPTIND=1
while getopts "p:t:f:s:r:RBChv" arg; do
case $arg in
p) ((p=(OPTARG>0)?OPTARG:p));;
t)
if [[ "$OPTARG" = c???????????????? ]]; then
V+=(${#sets[@]})
sets+=("${OPTARG:1}")
else
((OPTARG>=0 && OPTARG<${#sets[@]})) && V+=($OPTARG)
fi
;;
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;;
B) BOLD=0;;
C) NOCOLOR=1;;
h) echo -e "Usage: $(basename $0) [OPTION]..."
echo -e "Animated pipes terminal screensaver.\n"
echo -e " -p [1-]\tnumber of pipes (D=1)."
echo -e " -t [0-$((${#sets[@]} - 1))]\ttype of pipes, can be used more than once (D=0)."
echo -e " -t c[16 chars]\tcustom type of pipes."
echo -e " -f [20-100]\tframerate (D=75)."
echo -e " -s [5-15]\tprobability of a straight fitting (D=13)."
echo -e " -r LIMIT\treset after x characters, 0 if no limit (D=2000)."
echo -e " -R \t\trandom starting point."
echo -e " -B \t\tno bold effect."
echo -e " -C \t\tno color."
echo -e " -h\t\thelp (this screen)."
echo -e " -v\t\tprint version number.\n"
exit 0;;
v) echo "$(basename -- "$0") $VERSION"
exit 0
esac
done
# set default values if not by options
((${#V[@]})) || V=(0)
cleanup() {
# clear up standard input
read -t 0.001 && cat </dev/stdin>/dev/null
# terminal has no smcup and rmcup capabilities
((FORCE_RESET)) && reset && exit 0
tput rmcup
tput cnorm
stty echo
((NOCOLOR)) && echo -ne '\x1b[0m'
exit 0
}
trap resize SIGWINCH
trap cleanup HUP TERM
trap 'break 2' INT
resize
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[${#V[@]} * RANDOM / M]}
done
stty -echo
tput smcup || FORCE_RESET=1
tput civis
tput clear
# any key press exits the loop and this script
while REPLY=; read -t 0.0$((1000/f)) -n 1 2>/dev/null; [[ -z $REPLY ]] ; do
for (( i=1; i<=p; i++ )); do
# New position:
((${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]} ${x[i]}
echo -ne "\x1b[${BOLD}m"
[[ $NOCOLOR == 0 ]] && echo -ne "\x1b[3${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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