152 lines
4.4 KiB
Bash
Executable file
152 lines
4.4 KiB
Bash
Executable file
#!/usr/bin/env bash
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# set -vx
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printhelp() {
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cat <<EOM
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usage: dye [-x|-r] [color_code]
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options:
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-x hex to rgb
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-r rgb to hex
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examples:
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dye -x "#ffffff"
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dye -r 255 255 255
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dye -x "#43fF6480"
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dye -r 67 255 100 0.5
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EOM
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exit 1
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}
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error() {
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printf "error: %s\n" "$1" 1>&2
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${2:+exit $2}
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}
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dependencycheck() {
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local dep missingdependencies=0
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for dep in "$@"; do
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if ! command -v "$dep" &>/dev/null; then
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error "dependency not met: $dep"
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fi
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done
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if [[ $missingdependencies -gt 0 ]]; then
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exit 1
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fi
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}
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hex_to_rgb() {
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local a
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# null command ':' removes all leading hashtag characters
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: "${1/\#/}"
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# if hex value is 8 characters
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if ((${#_} == 8)); then
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# convert characters to hex (see credits at bottom)
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((r = 16#${_:0:2}, g = 16#${_:2:2}, b = 16#${_:4:2}, a = 16#${_:6:2}))
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# simple calc for alpha channel
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a=$(echo "scale=2; $a / 255" | bc)
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# else if hex value is 6 characters (no alpha channel)
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elif ((${#_} == 6)); then
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((r = 16#${_:0:2}, g = 16#${_:2:2}, b = 16#${_:4:2}))
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a=1.0
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# else if hex value is 3 characters (minimal hex value provided)
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elif ((${#_} == 3)); then
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# if the first character still has a hashtag in it...
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if [[ ${1:0:1} != "#" ]]; then
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color="#$1"
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else
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color="$1"
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fi
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# grab out each passed value
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r="$(echo "$color" | cut -c2)"
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g="$(echo "$color" | cut -c3)"
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b="$(echo "$color" | cut -c4)"
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# and convert them to hexadecimal
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r=$(printf "%d" 0x$r$r)
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g=$(printf "%d" 0x$g$g)
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b=$(printf "%d" 0x$b$b)
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# ((r = 16#${_:0:1}, g = 16#${_:1:1}, b = 16#${_:2:1}))
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a=1.0
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else
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error "$1 is not a recognized hex color code."
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fi
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printf "%s\n" "rgba($r, $g, $b, $a)"
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}
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# parse_rgb() takes rgb string to extract
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# numeric values from it and then pass that to rgb_to_hex()
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# parse_rgb() {
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#
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# }
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rgb_to_hex() {
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local a
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# if a fourth arg is provided (alpha channel)
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if [[ -n "$4" ]]; then
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# converts alpha channel to hex (see below)
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a=$(printf "%02x\n" "$(echo "scale=0; $4*255" | bc)" 2>/dev/null)
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printf "#%02x%02x%02x%s\n" "$1" "$2" "$3" "$a"
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else
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printf "#%02x%02x%02x\n" "$1" "$2" "$3"
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fi
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}
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main() {
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[[ "$#" -lt 1 ]] && printhelp
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while getopts ":x:r:?" arg; do
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case $arg in
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x)
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if [[ "$#" -gt 2 ]]; then
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error "-x only parses one following argument"
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exit 2
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fi
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local rgbval clipit
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rgbval=$(hex_to_rgb "${2:-''}")
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printf "%s\n" "$rgbval"
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read -e -r -p "save code to clipboard?(y/n): " clipit
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if [[ "$clipit" == "yes" || "$clipit" == "y" ]]; then
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dependencycheck xclip
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printf "%s" "$rgbval" | xclip -sel clip
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fi
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;;
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r)
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# parse an 'rgb()' or 'rgba' string here
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# regex compare to string
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if [[ "$#" -gt 5 ]]; then
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error "-r parses up to four following argument"
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exit 2
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elif [[ "$#" -lt 4 ]]; then
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error "-r parses no less than three arguments"
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exit 2
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fi
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local hexval clipit
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hexval=$(rgb_to_hex "${@:2}")
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printf "%s\n" "$hexval"
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read -e -r -p "save code to clipboard?(y/n): " clipit
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if [[ "$clipit" == "yes" || "$clipit" == "y" ]]; then
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dependencycheck xclip
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printf "%s" "$hexval" | xclip -sel clip
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fi
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;;
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?)
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printhelp
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;;
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esac
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done
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}
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main "$@"
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# Credits:
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# Thanks go out to those who helped:
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# Akash Mittal, whose article provided the original versions of hex_to_rgb() and rgb_to_hex() taken from
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# https://akashmittal.com/code-example-convert-hex-color-to-rgb-rgb-to-hex-using-bash-script/
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# redditor zeekar who broke down what those functions did line by line:
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# https://reddit.com/r/bash/comments/zqmvz8/rgbhex_converter_syntax_how_does_this_work/
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# redditor DyslexicHobo, who suggested ChatGPT, which I used to finalize the
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# rgb_to_hex() function. Thank you AI overlords!
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# https://openai.com/blog/chatgpt/
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