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65 lines
1.6 KiB
Bash
Executable File
65 lines
1.6 KiB
Bash
Executable File
#!/usr/bin/env bash
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# dimmer is a script that changes hex color codes to reduce brightness
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# Copyright (C) 2016 Anton Karmanov <starcom24@gmail.com>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or any
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# later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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brightness=50
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if [ -n "$1" ] ; then
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brightness=$1
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fi
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shopt -s nocasematch
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while read -r line
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do
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if
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! [[ $brightness =~ ^[0-9]+$ ]] || \
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[ "$brightness" -lt 0 ] || \
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[ "$brightness" -gt 100 ]
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then
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>&2 echo "dimmer: Invalid brightness value"
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exit 1
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fi
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if [ ${#line} -eq 7 ] && [ "${line:0:1}" = "#" ] &&\
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[[ ${line:1:6} =~ ^[0-9A-F]{6}$ ]]
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then
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if [ "${brightness}" -eq 0 ]
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then
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# shellcheck disable=SC2016
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line='$000000'
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else
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colors=("0x${line:1:2}" "0x${line:3:2}" "0x${line:5:2}")
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line='#'
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for color in "${colors[@]}"; do
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value=$(((color + (100 / brightness - 1)) * brightness / 100))
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color=$(echo "obase=16; ${value}" | bc)
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# If <= 9 supplement with 0.
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if [ ${#color} -lt 2 ] ; then
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color="0${color}"
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fi
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line="$line$color"
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done
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fi
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fi
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echo "$line"
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done
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