#!/bin/bash
#
# NAME
#     ijupdate - Checks for new available ImageJ and instructs update.
#
# SYNOPSIS
#     ijupdate option1 [option2] [option3]
#
# DESCRIPTION
#     This script expects at least one switch, or does nothing.
#     --ignore (-i) --help (-h) --version (-V) are allowed.

declare -r SCRIPT=${0##*/}
declare -r VER="0.2"
declare -r TMP="/tmp"
ignore=0

# ! FIXME: Check to see if eix package exists, since this script 
#          depends on it to query the ImageJ version
#
# + FIXME: Add pretty colors to output

function help {
    printf "%s\n\n%s\n%s\n%s\n%s\n" "usage: $SCRIPT <options>" \
        "options: -[i:hV]" "-i, --ignore (sync)" "-h, --help" "-V, --version"
}
declare -r help

function sync {
    # Create index.html of available source tarballs
    rm $TMP/index.html
    wget -P $TMP \
        http://rsb.info.nih.gov/ij/download/src/
}
declare -r sync

# Process the parameters
#
while [ $# -gt 0 ] ; do
    case "$1" in
    -h | --help)
        help
        exit 0
        ;;
    -V | --version)
        printf "%s\n" "$SCRIPT $VER"
        exit 0
        ;;
    -i | --ignore)
        printf "%s\n%s\n\n" "! Not fetching list of ImageJ versions from:" \
            "http://rsb.info.nih.gov/ij/download/src/"
        ignore=1
        ;;
    -*) printf "$SCRIPT:$LINENO: %s\n\n" "switch $1 not supported" >&2
        help
        exit 192
        ;;
    * ) printf "$SCRIPT:$LINENO: %s\n\n" "extra argument or missing switch" >&2
        help
        exit 192
        ;;
    esac
    shift
done

if [ $ignore == 0 ]; then
    # Fetch available ImageJ versions
    sync
fi

# Detect installed version of ImageJ
i=`eix -*c imagej | cut -b26-30 | sed 's/\@//'`

# List versions of tarballs
list=`grep -o \>ij.*-src.zip $TMP/index.html | \
    sed -e 's/>ij//' -e 's/-src.zip//' -e 's/\([0-9]\)\(.*\)/\1.\2/'`

# Show installed        
printf "%s\n" "ImageJ tarballs available:"
if [ -z $i ]; then
    printf "%s\n" $list
    printf "\n%s\n%s\n%s\n" "No imagej ebuild found using 'eix'" \
        "Please get it from:" "http://bugs.gentoo.org/112275" \
        "Or maybe you need to run update-eix"
else
    echo $list | grep --color $i
    latest=`printf "%s\n" $list | tail --bytes=6 | sed s/' '//`
    if [ "$latest" == "$i" ]; then
        printf "\n%s\n" "Already up to date"
    else
        printf "\n%s\n\n%s\n%s\n%s\n\n%s\n" \
            "You can create the $latest ebuild by running:" \
            "  cd /usr/local/portage/sci-misc/imagej/" \
            "  cp imagej-$i.ebuild imagej-$latest.ebuild" \
            "  ebuild imagej-$latest.ebuild manifest" \
            "Then use your favorite command to install"
    fi
fi

exit 0