38 lines
1.1 KiB
Bash
38 lines
1.1 KiB
Bash
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#!/usr/bin/env bash
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# Jon Millen's 1D Game of Life in pure Bash
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# Usage: echo 'state' | 1dlife [iterations]
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# Created by Luxferre in 2026, released into public domain
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ITERS="$1"
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[[ -z "$ITERS" ]] && ITERS=$(($(tput lines) - 1))
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[[ -z "$RENDER_CHAR" ]] && RENDER_CHAR='#'
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# read and process the state
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IFS= read -r state
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state="${state//[[:space:]]/0}"
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state="${state//[^0]/1}"
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slen=$((${#state} - 1)) # length + 4 (temporary padding) - 5
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# complete rule mapping
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declare -A values=(
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00000 0 00001 0 00010 0 00011 1
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00100 0 00101 0 00110 0 00111 1
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01000 0 01001 1 01010 1 01011 1
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01100 0 01101 1 01110 1 01111 0
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10000 0 10001 1 10010 1 10011 1
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10100 0 10101 1 10110 1 10111 0
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11000 1 11001 1 11010 1 11011 0
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11100 1 11101 0 11110 0 11111 1)
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for ((i=0; i<ITERS; ++i)); do
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state="00${state}00" # pad the current state from both sides
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newstate=''
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for ((k=0; k<slen; ++k)); do
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vidx="${state:k:5}"
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newstate="${newstate}${values[$vidx]}"
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done
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state="$newstate"
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newstate="${newstate//0/ }"
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printf '%s\n' "${newstate//1/$RENDER_CHAR}"
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done
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