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Diffstat (limited to 'fun/bin/pipes')
| -rwxr-xr-x | fun/bin/pipes | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/fun/bin/pipes b/fun/bin/pipes new file mode 100755 index 0000000..43e7046 --- /dev/null +++ b/fun/bin/pipes @@ -0,0 +1,122 @@ +#!/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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