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lejenome/matrix-term.sh

Created June 23, 2014 21:21
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  1. lejenome created this gist Jun 23, 2014.
    67 changes: 67 additions & 0 deletions matrix-term.sh
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,67 @@
    #!/bin/bash
    state=()
    data=()
    current=""
    # Min length of matrix line
    MIN=5
    W=$(tput cols)
    H=$(tput lines)
    DATA_SIZE=$((W*(H-1)))
    PER_COL=15
    PER_LINE=2
    SLEEP=0.2
    FG_COLOR=32
    #BG_COLOR=40

    quit() {
    echo -ne "\e[?25h"
    echo -ne "\e[0m"
    stty echo
    clear
    exit 0
    }
    # set SIGTERM handler
    trap quit HUP TERM
    # quit the loops on SIGINT
    trap 'break 2' INT

    # No echo stdin
    stty -echo
    # hide the cursor
    echo -ne "\e[?25l"
    # set the output color
    echo -ne "\e[1m"
    echo -ne "\e[${FG_COLOR}m"
    [ -n "$BG_COLOR" ] && echo -ne "\e[${BG_COLOR}m"
    clear
    # intialize the columns state counter to 0
    for ((i=0; i < $W; i++));
    do
    state[$i]=0
    done

    while true;
    do
    current=""
    for ((i=0; i < $W; i++));
    do
    # set the new state of the current column
    if (( state[$i] == 0 ))
    then
    (( state[$i] = (RANDOM % PER_COL == 0) ? 1 : 0 ))
    elif (( state[$i] < MIN ))
    then
    (( state[$i]++ ))
    else
    (( state[$i] = (RANDOM % PER_LINE == 0) ? (state[$i] + 1) : 0 ))
    fi
    # if state is 0 add a space otherwise add 0 or 1 (%2)
    (( state[$i] == 0 )) && current="${current} " \
    || current="${current}$((state[$i]%2))"
    done
    # add the new line to the data
    data="${current}${data:0:$DATA_SIZE}"
    sleep $SLEEP
    echo -ne "\e[1;1H${data}"
    done
    quit