From 150a70bbad7a6038c81145bd1673c2c1cefe7eb1 Mon Sep 17 00:00:00 2001
From: xero <x@xero.nu>
Date: Sun, 9 Mar 2014 19:11:14 -0400
Subject: update fun pipes scripts

---
 code/fun/pipes | 76 ++++++++++++++++++++++++++++++++++------------------------
 1 file changed, 45 insertions(+), 31 deletions(-)

(limited to 'code/fun/pipes')

diff --git a/code/fun/pipes b/code/fun/pipes
index 5cc366e..43e7046 100755
--- a/code/fun/pipes
+++ b/code/fun/pipes
@@ -1,29 +1,19 @@
-#!/bin/bash
-# The author of the original script is unknown to me. The first entry I can
-# find was posted at 2010-03-21 09:50:09 on Arch Linux Forums (doesn't mean the
-# poster is the author at all):
+#!/usr/bin/env bash
+# pipes.sh: Animated pipes terminal screensaver.
 #
-#   https://bbs.archlinux.org/viewtopic.php?pid=728932#p728932
+# This modified version is maintained at:
 #
-# I, Yu-Jie Lin, made a few changes and additions:
-#
-#   -p, -t, -R, and -C
-#
-#   Screenshot: http://flic.kr/p/dRnLVj
-#   Screencast: http://youtu.be/5XnGSFg_gTk
-#
-# And push the commits to Gist:
-#
-#   https://gist.github.com/4689307
-#
-# I, Devin Samarin, made a few changes and additions:
-#
-#   -r can be 0 to mean "no limit".
-#   Reset cursor visibility after done.
-#   Cleanup for those people who want to quit with ^C
-#
-#   Pushed the changes to https://gist.github.com/4725048
+#   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)
@@ -36,16 +26,18 @@ sets=(
     "│╭ ╮╯─╮  ╰│╯╰ ╭─"
     "│┌ ┐┘─┐  └│┘└ ┌─"
     "║╔ ╗╝═╗  ╚║╝╚ ╔═"
+    "|+ ++-+  +|++ +-"
+    "|/ \/-\  \|/\ /-"
 )
-v="${sets[0]}"
+v=()
 RNDSTART=0
 NOCOLOR=0
 
 OPTIND=1
-while getopts "p:t:f:s:r:RCh" arg; do
+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="${sets[OPTARG]}";;
+    t) ((OPTARG>=0 && OPTARG<${#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));;
@@ -54,20 +46,39 @@ case $arg in
     h) echo -e "Usage: $(basename $0) [OPTION]..."
         echo -e "Animated pipes terminal screensaver.\n"
         echo -e " -p [1-]\tnumber of pipes (D=1)."
-        echo -e " -t [0-$((${#sets[@]} - 1))]\ttype of pipes (D=0)."
+        echo -e " -t [0-$((${#sets[@]} - 1))]\ttype of pipes, can be used more than once (D=0)."
         echo -e " -f [20-100]\tframerate (D=75)."
         echo -e " -s [5-15]\tprobability of a straight fitting (D=13)."
         echo -e " -r LIMIT\treset after x characters, 0 if no limit (D=2000)."
         echo -e " -R \t\trandom starting point."
         echo -e " -C \t\tno color."
-        echo -e " -h\t\thelp (this screen).\n"
+        echo -e " -h\t\thelp (this screen)."
+        echo -e " -v\t\tprint version number.\n"
         exit 0;;
+    v) echo "$(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$((1000/f))"
+fi
+
 cleanup() {
+    # clear up standard input
+    read -t 0 && cat </dev/stdin>/dev/null
+
     tput rmcup
     tput cnorm
+    stty echo
     exit 0
 }
 trap cleanup SIGHUP SIGINT SIGTERM
@@ -76,18 +87,21 @@ for (( i=1; i<=p; i++ )); do
     c[i]=$((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
-while ! read -t0.0$((1000/f)) -n1; do
+# 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))
+        ((${x[i]}>w||${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))
 
@@ -99,7 +113,7 @@ while ! read -t0.0$((1000/f)) -n1; do
         # Print:
         tput cup ${y[i]} ${x[i]}
         [[ $NOCOLOR == 0 ]] && echo -ne "\033[1;3${c[i]}m"
-        echo -n "${v:l[i]*4+n[i]:1}"
+        echo -n "${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++))
-- 
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