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#!/usr/bin/env bash
# Image viewer for terminals that support true colors.
# Copyright (C) 2014 Egmont Koblinger
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
sep1=':'
sep2='::'
if [ "$1" = "-colon4" -o "$1" = "-official" -o "$1" = "-dejure" ]; then
shift
elif [ "$1" = "-colon3" -o "$1" = "-wrong" ]; then
sep2=':'
shift
elif [ "$1" = "-semicolon" -o "$1" = "-common" -o "$1" = "-defacto" ]; then
sep1=';'
sep2=';'
shift
fi
if [ $# != 1 -o "${1:0:1}" = "-" ]; then
echo 'Usage: img.sh [-format] imagefile' >&2
echo >&2
echo ' -colon4|-official|-dejure: Official format (default) \e[38:2::R:G:Bm' >&2
echo ' -colon3|-wrong: Misinterpreted format \e[38:2:R:G:Bm' >&2
echo ' -semicolon|-common|-defacto: Commonly used format \e[38;2;R;G;Bm' >&2
exit 1
elif [ -z $(type -p convert) ]; then
echo 'Please install ImageMagick to run this script.' >&2
exit 1
fi
# This is so that "upper" is still visible after exiting the while loop.
shopt -s lastpipe
COLUMNS=$(tput cols)
declare -a upper lower
upper=()
lower=()
convert -thumbnail ${COLUMNS}x -define txt:compliance=SVG "$1" txt:- |
while IFS=',:() ' read col row dummy red green blue rest; do
if [ "$col" = "#" ]; then
continue
fi
if [ $((row%2)) = 0 ]; then
upper[$col]="$red$sep1$green$sep1$blue"
else
lower[$col]="$red$sep1$green$sep1$blue"
fi
# After reading every second image row, print them out.
if [ $((row%2)) = 1 -a $col = $((COLUMNS-1)) ]; then
i=0
while [ $i -lt $COLUMNS ]; do
echo -ne "\\e[38${sep1}2${sep2}${upper[$i]};48${sep1}2${sep2}${lower[$i]}m▀"
i=$((i+1))
done
# \e[K is useful when you resize the terminal while this script is still running.
echo -e "\\e[0m\e[K"
upper=()
d=()
fi
done
# Print the last half line, if required.
if [ "${upper[0]}" != "" ]; then
i=0
while [ $i -lt $COLUMNS ]; do
echo -ne "\\e[38${sep1}2${sep2}${upper[$i]}m▀"
i=$((i+1))
done
echo -e "\\e[0m\e[K"
fi
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