#!/bin/bash

scriptname=$(basename $0)
identify="identify"

usage() {
	echo "Usage: $0 fontname"
	echo "fontname: The name of the font. Must correspond to existing texture/font_<fontname>_????.png files"
}

if [ $# -ne 1 ]
then
	usage
	exit 1
fi

font_name=$1

for f in textures/font_${font_name}_????.png
do
    if [[ $f =~ textures/font_${font_name}_([0-9a-fA-F]{4}).png ]]
    then
        code=$((16#${BASH_REMATCH[1]}))
        size=$(identify $f | cut -d " " -f 3)
        w=$(echo $size | cut -d "x" -f 1)
        h=$(echo $size | cut -d "x" -f 2)  

        if [ -z "$font_height" ]
        then
        	font_height=$h
        else
        	if [ $font_height -ne $h ]
        	then
        		echo "Error : $f as height of $h pixels, previous textures have a height of $font_height pixels. All textures should have the same height."
        	fi
        fi

        if [ -z "$font_widths" ]
        then
      	    font_widths="[$code]=$w"
      	else
      	    font_widths="$font_widths, [$code]=$w"
      	fi
    fi
done

echo "--[[

$luafile generated by $scriptname $(LANG=en_US date)

--]]

font_api.register_font(
	'$font_name',
	{
		height = $font_height,
		widths = {
			$font_widths
		},
	}
);
" > font_$font_name.lua

if grep -q font_api depends.txt &>/dev/null
then
	echo "font_api already in depends.txt."
else
	echo "adding font_api to depends.txt."
	echo "font_api" >> depends.txt
fi