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109 lines
3.1 KiB
Bash
109 lines
3.1 KiB
Bash
#!/bin/bash
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# The author of the original script is unknown to me. The first entry I can
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# find was posted at 2010-03-21 09:50:09 on Arch Linux Forums (doesn't mean the
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# poster is the author at all):
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#
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# https://bbs.archlinux.org/viewtopic.php?pid=728932#p728932
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#
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# I, Yu-Jie Lin, made a few changes and additions:
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#
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# -p, -t, -R, and -C
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#
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# Screenshot: http://flic.kr/p/dRnLVj
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# Screencast: http://youtu.be/5XnGSFg_gTk
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#
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# And push the commits to Gist:
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#
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# https://gist.github.com/4689307
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#
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# I, Devin Samarin, made a few changes and additions:
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#
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# -r can be 0 to mean "no limit".
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# Reset cursor visibility after done.
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# Cleanup for those people who want to quit with ^C
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#
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# Pushed the changes to https://gist.github.com/4725048
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p=1
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f=75 s=13 r=2000 t=0
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w=$(tput cols) h=$(tput lines)
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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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v="${sets[0]}"
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RNDSTART=0
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NOCOLOR=0
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OPTIND=1
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while getopts "p:t:f:s:r:RCh" arg; do
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case $arg in
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p) ((p=(OPTARG>0)?OPTARG:p));;
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t) ((OPTARG>=0 && OPTARG<${#sets[@]})) && v="${sets[OPTARG]}";;
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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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C) NOCOLOR=1;;
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h) echo -e "Usage: $(basename $0) [OPTION]..."
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echo -e "Animated pipes terminal screensaver.\n"
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echo -e " -p [1-]\tnumber of pipes (D=1)."
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echo -e " -t [0-$((${#sets[@]} - 1))]\ttype of pipes (D=0)."
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echo -e " -f [20-100]\tframerate (D=75)."
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echo -e " -s [5-15]\tprobability of a straight fitting (D=13)."
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echo -e " -r LIMIT\treset after x characters, 0 if no limit (D=2000)."
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echo -e " -R \t\trandom starting point."
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echo -e " -C \t\tno color."
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echo -e " -h\t\thelp (this screen).\n"
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exit 0;;
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esac
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done
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cleanup() {
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tput rmcup
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tput cnorm
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exit 0
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}
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trap cleanup SIGHUP SIGINT SIGTERM
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for (( i=1; i<=p; i++ )); do
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c[i]=$((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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done
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tput smcup
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tput reset
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tput civis
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while ! read -t0.0$((1000/f)) -n1; do
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for (( i=1; i<=p; i++ )); do
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# New position:
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((${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))
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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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[[ $NOCOLOR == 0 ]] && echo -ne "\033[1;3${c[i]}m"
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echo -n "${v:l[i]*4+n[i]:1}"
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l[i]=${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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