#!/bin/bash -
#===============================================================================
#
#          FILE: vifm-imagepreview.sh
#
#         USAGE: ./vifm-imagepreview.sh
#
#   DESCRIPTION: Image previewer for vifm.
#                Based on script by z3bra -- 2014-01-21
#                This is called by vifm by adding the following line to vimfrc file:
#
#                fileviewer *.bmp,*.jpg,*.jpeg,*.png,*.gif,*.xpm vifm-imagepreviewer.sh %px %py %pw %ph %c
#
#       OPTIONS: ---
#  REQUIREMENTS: ---
#          BUGS: ---
#         NOTES: ---
#        AUTHOR: Vito G. Graffagnino (), v.graffagnino@btinternet.com
#  ORGANIZATION: 
#       CREATED: 04/05/17 11:19:39
#      REVISION:  ---
#===============================================================================
set -o nounset                              # Treat unset variables as an error
W3MIMGDISPLAY="/usr/lib64/w3m/w3mimgdisplay"
FONTH=15 # Size of one terminal row
FONTW=7 # Size of one terminal column
X=$1
Y=$2
COLUMNS=$3
LINES=$4
FILENAME=$5
read width height <<< `echo "5;$FILENAME" | $W3MIMGDISPLAY`
if [ -z "$width" -o -z "$height" ]; then
       echo 'Error: Failed to obtain image size.'
       exit 1
fi
x=$((FONTW * X))
y=$((FONTH * Y))
max_width=$((FONTW * COLUMNS))
max_height=$((FONTH * LINES))
if [ "$width" -gt "$max_width" ]; then
     height=$((height * max_width / width))
     width=$max_width
fi
if [ "$height" -gt "$max_height" ]; then
     width=$((width * max_height / height))
     height=$max_height
fi
w3m_command="0;1;$x;$y;$width;$height;;;;;$FILENAME\n4;\n3;"
echo -e "$w3m_command" | $W3MIMGDISPLAY