137 lines
3.7 KiB
Bash
Executable File
137 lines
3.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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# pipes.sh: Animated pipes terminal screensaver.
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#
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# This modified version is maintained at:
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#
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# https://github.com/pipeseroni/pipes.sh
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VERSION=1.2.0
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M=32768
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p=1
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f=75 s=13 r=2000 t=0
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w=80 h=24
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resize() {
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w=$(tput cols) h=$(tput lines)
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}
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# ab -> idx = a*4 + b
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# 0: up, 1: right, 2: down, 3: left
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# 00 means going up , then going up -> ┃
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# 12 means going right, then going down -> ┓
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sets=(
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"┃┏ ┓┛━┓ ┗┃┛┗ ┏━"
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"│╭ ╮╯─╮ ╰│╯╰ ╭─"
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"│┌ ┐┘─┐ └│┘└ ┌─"
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"║╔ ╗╝═╗ ╚║╝╚ ╔═"
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"|+ ++-+ +|++ +-"
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"|/ \/-\ \|/\ /-"
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".. .... .... .."
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".o oo.o o.oo o."
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"-\ /\|/ /-\/ \|" # railway
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"╿┍ ┑┚╼┒ ┕╽┙┖ ┎╾" # knobby pipe
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)
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v=()
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RNDSTART=0
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BOLD=1
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NOCOLOR=0
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OPTIND=1
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while getopts "p:t:f:s:r:RBChv" arg; do
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case $arg in
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p) ((p=(OPTARG>0)?OPTARG:p));;
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t)
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if [[ "$OPTARG" = c???????????????? ]]; then
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V+=(${#sets[@]})
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sets+=("${OPTARG:1}")
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else
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((OPTARG>=0 && OPTARG<${#sets[@]})) && V+=($OPTARG)
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fi
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;;
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f) ((f=(OPTARG>19 && OPTARG<101)?OPTARG:f));;
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s) ((s=(OPTARG>4 && OPTARG<16 )?OPTARG:s));;
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r) ((r=(OPTARG>=0)?OPTARG:r));;
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R) RNDSTART=1;;
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B) BOLD=0;;
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C) NOCOLOR=1;;
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h) echo -e "Usage: $(basename $0) [OPTION]..."
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echo -e "Animated pipes terminal screensaver.\n"
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echo -e " -p [1-]\tnumber of pipes (D=1)."
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echo -e " -t [0-$((${#sets[@]} - 1))]\ttype of pipes, can be used more than once (D=0)."
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echo -e " -t c[16 chars]\tcustom type of pipes."
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echo -e " -f [20-100]\tframerate (D=75)."
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echo -e " -s [5-15]\tprobability of a straight fitting (D=13)."
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echo -e " -r LIMIT\treset after x characters, 0 if no limit (D=2000)."
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echo -e " -R \t\trandom starting point."
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echo -e " -B \t\tno bold effect."
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echo -e " -C \t\tno color."
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echo -e " -h\t\thelp (this screen)."
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echo -e " -v\t\tprint version number.\n"
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exit 0;;
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v) echo "$(basename -- "$0") $VERSION"
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exit 0
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esac
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done
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# set default values if not by options
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((${#V[@]})) || V=(0)
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cleanup() {
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# clear up standard input
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read -t 0.001 && cat </dev/stdin>/dev/null
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# terminal has no smcup and rmcup capabilities
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((FORCE_RESET)) && reset && exit 0
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tput rmcup
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tput cnorm
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stty echo
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((NOCOLOR)) && echo -ne '\x1b[0m'
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exit 0
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}
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trap resize SIGWINCH
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trap cleanup HUP TERM
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trap 'break 2' INT
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resize
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for (( i=1; i<=p; i++ )); do
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c[i]=$((i%8)) n[i]=0 l[i]=0
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((x[i]=RNDSTART==1?RANDOM*w/32768:w/2))
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((y[i]=RNDSTART==1?RANDOM*h/32768:h/2))
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v[i]=${V[${#V[@]} * RANDOM / M]}
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done
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stty -echo
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tput smcup || FORCE_RESET=1
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tput civis
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tput clear
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# any key press exits the loop and this script
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while REPLY=; read -t 0.0$((1000/f)) -n 1 2>/dev/null; [[ -z $REPLY ]] ; do
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for (( i=1; i<=p; i++ )); do
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# New position:
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((${l[i]}%2)) && ((x[i]+=-${l[i]}+2,1)) || ((y[i]+=${l[i]}-1))
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# Loop on edges (change color on loop):
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((${x[i]}>=w||${x[i]}<0||${y[i]}>=h||${y[i]}<0)) && ((c[i]=RANDOM%8, v[i]=V[${#V[@]}*RANDOM/M]))
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((x[i]=(x[i]+w)%w))
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((y[i]=(y[i]+h)%h))
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# New random direction:
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((n[i]=RANDOM%s-1))
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((n[i]=(${n[i]}>1||${n[i]}==0)?${l[i]}:${l[i]}+${n[i]}))
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((n[i]=(${n[i]}<0)?3:${n[i]}%4))
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# Print:
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tput cup ${y[i]} ${x[i]}
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echo -ne "\x1b[${BOLD}m"
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[[ $NOCOLOR == 0 ]] && echo -ne "\x1b[3${c[i]}m"
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echo -n "${sets[v[i]]:l[i]*4+n[i]:1}"
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l[i]=${n[i]}
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done
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((r>0 && t*p>=r)) && tput reset && tput civis && t=0 || ((t++))
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done
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cleanup
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