#!/bin/sh
# Replace .IMG commands for proper 
# .PDFPIC and convert given image files.

FILE="$1"
OUTPUT="$(cat "$FILE")"

format() {
    LINE="$1"
    IMAGE="$(echo "$LINE" | cut -d '"' -f 2)"
    [ "$IMAGE" != "${IMAGE%%.*}.pdf" ] && ! [ -e "${IMAGE%%.*}.pdf" ] && convert -quiet "$IMAGE" "${IMAGE%%.*}.pdf"
    echo "$LINE" | sed 's|^.IMG|.PDFPIC|' | sed "s|$IMAGE|${IMAGE%%.*}.pdf|"
}

for i in $(seq $(grep '^.IMG\s' "$FILE" | wc -l)) ; do
    LINE="$(echo "$OUTPUT" | grep '^.IMG\s' | head -n 1)"
    [ -n "$LINE" ] && NEW_LINE="$(format "$LINE")" && OUTPUT=$(echo "$OUTPUT" | sed "s|$LINE|$NEW_LINE|") || break
done

echo "$OUTPUT"