Wrapper script for jp2a that will attempt to convert other image formats to JPEG. Requires ImageMagick's convert (or compatible).

xx2a

#!/bin/bash

JP2A=$(dirname "$0")/jp2a

declare -a jp2aopts
while [[ $# -gt 0 ]] ; do
  case "$1" in
    -) break ;;
    --) shift ; break ;;
    -*) jp2aopts+=( "$1" ) ; shift ;;
    *) break ;;
  esac
done

declare -a inputjpgs
for original in "$@" ; do
  if [[ "${original}" == - || $( file "${original}" ) =~ ^JPEG\ image\ data ]] ; then
    inputjpgs+=( "${original}" )
  else
    tmpjpg=$(mktemp --suffix=.jpg)
    convert "${original}" "${tmpjpg}"
    inputjpgs+=( "${tmpjpg}" )
  fi
done

"${JP2A}" "${jp2aopts[@]}" "${inputjpgs[@]}"