42 lines
1.3 KiB
Bash
Executable file
42 lines
1.3 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -e -o pipefail
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# Prompt user for HSLA values
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echo -n "Enter HSLA values: "
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read h s l a
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# Convert HSL to RGB
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if [[ ${s} -eq 0 ]]; then
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r=$((l*255))
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g=$((l*255))
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b=$((l*255))
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else
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if [[ $(echo "${l} < 0.5" | bc -l) -eq 1 ]]; then q=$((l*(1+s))); else q=$((l+s-(l*s))); fi
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p=$((2*l-q))
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r=$(printf "%.0f" $(echo "(${p}+(${q}-${p})*${hue_to_rgb(p,q,$(((h+120)%360)))})" | bc -l))
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g=$(printf "%.0f" $(echo "(${p}+(${q}-${p})*${hue_to_rgb(p,q,${h})})" | bc -l))
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b=$(printf "%.0f" $(echo "(${p}+(${q}-${p})*${hue_to_rgb(p,q,$(((h-120+360)%360)))})" | bc -l))
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fi
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# Convert RGB to hex
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r=$((r/16))
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g=$((g/16))
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b=$((b/16))
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hex="#$(printf "%x" ${r})$(printf "%x" ${g})$(printf "%x" ${b})"
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# Output hex color code
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echo ${hex}
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# Helper function to convert hue to RGB
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hue_to_rgb() {
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p=${1}
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q=${2}
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t=${3}
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if [[ $(echo "${t} < 0" | bc -l) -eq 1 ]]; then t=$((t+360)); fi
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if [[ $(echo "${t} > 360" | bc -l) -eq 1 ]]; then t=$((t-360)); fi
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if [[ $(echo "${t} < 60" | bc -l) -eq 1 ]]; then return $(echo "(${p}+(${q}-${p})*${t}/60)" | bc -l); fi
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if [[ $(echo "${t} < 180" | bc -l) -eq 1 ]]; then return $(echo "${q}" | bc -l); fi
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if [[ $(echo "${t} < 240" | bc -l) -eq 1 ]]; then return $(echo "(${p}+(${q}-${p})*(240-${t})/60)" | bc -l); fi
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return $(echo "${p}" | bc -l)
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}
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