Created
November 16, 2023 00:54
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matrix-style-cascading-screensaver-in-bash
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| #!/bin/bash | |
| # free time plus a need to build a screensaver in bash, enjoy the cascade. | |
| # ps. the key to this is the "eval" function. | |
| # - gary | |
| # clear the screen and hide the cursor | |
| echo -e "\033[2J\033[?25l" | |
| # get the number of lines and columns of the terminal | |
| R=$(tput lines) | |
| C=$(tput cols) | |
| R=$((R - 1)) # decrease R by 1 for zero-based indexing | |
| # dame to display | |
| name="Gary" | |
| name_length=${#name} | |
| while true; do | |
| ( | |
| # shorthand for echo and sleep | |
| e='echo -e' | |
| s='sleep' | |
| j=$((RANDOM % C)) | |
| d=$((RANDOM % R)) | |
| # display characters | |
| for i in $(eval echo {1..$R}); do | |
| if ((RANDOM % 10 == 0)); then | |
| #c=${name:$((RANDOM % name_length)):1} | |
| c=$name | |
| else | |
| c=$(printf '\\\\0%o' $((RANDOM % 57 + 33))) | |
| fi | |
| # print the character in green then in white at each position(matrix style) | |
| eval $e "\"\033[$((i-1));${j}H\033[32m$c\033[$i;${j}H\033[37m$c\"" | |
| eval $s 0.1 | |
| if [ $i -ge $d ]; then | |
| eval $e "\"\033[$((i-d));${j}H \"" | |
| fi | |
| done | |
| for i in $(eval echo {$((i-d))..$R}); do | |
| eval $e "\"\033[$i;${j}f \"" | |
| eval $s 0.1 | |
| done | |
| ) & | |
| sleep 0.05 | |
| done | |
| # does this even work? | |
| trap 'echo -e "\033[?25h"; clear; exit' SIGINT |
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