#! /bin/sh

# Convert svg file to png with a target width and height
# width and height are derived from the directory name
# of the target. Width and height must be equal

# Arg1: Source svg file
# Arg2: Filename for copyright notice
# Arg3: Target png file

# Extract the icon width from the target path e.g.
# src/ui/gui/icons/48x48/actions/file-save.png
# should result in a width of 48
stripprefix=${3#src*icons\/}
width=${stripprefix%%x*}

if (gimp --version) >/dev/null 2>&1; then
    echo "Converting $1 to $3 size $widthx$width with GIMP"
    comment=`cat $2`
    # If no width can be extracted from the destination path
    # then take the natural width by setting width to 0
    case "$width" in
	[0-9][0-9] | [0-9][0-9][0-9])  ;;
	*)                 width="0";;
    esac
    gimp -i -d -b "\
(let* ((image (car (file-svg-load 1 \"$1\" \"$1\" 90 $width $width 0 ))))
      (gimp-image-attach-parasite image '(\"gimp-comment\" 0 \"$comment\"))
      (gimp-file-save 1 image (car (gimp-image-get-active-drawable image))
		      \"$3\" \"$3\"))
    (gimp-quit 1)"
elif (rsvg-convert --version) >/dev/null 2>&1; then
    echo "Converting $1 to $3 size $widthx$width with rsvg-convert"
    case $width in
	[0-9][0-9] | [0-9][0-9][0-9]) widthoption="--width=$width --height=$width" ;;
	*) widthoption= ;;
    esac
    rsvg-convert $widthoption "$1" > "$3"
else
    echo "$0: can't find gimp or rsvg-convert" >&2
    exit 1
fi