#!/bin/sh

# Copyleft (C) 2008 by VooDooMan
# Version: 8.2009-05-13T2041-UTC+0100
# License: Public domain

# BEGIN: config
HASH_ALGOS="${HASH_ALGOS} md5 sha1 sha256 sha224 sha256 sha384 sha512"
OUT_PREFIX="DIGESTS"
EXCLUDE_PATTERNS="DIGESTS* .* mkdigests.sh check_digests.sh"
# END  : config

HASH_ALGOS="${HASH_ALGOS} $1"
HASH_ALGOS=`echo -n "${HASH_ALGOS}" | sed -r 's, +, ,g' | sed 's, ,\n,g' | \
    sort | uniq | tr '\n' ' '`

unset ha
unset bad
my_path="`echo -n \"${PATH}\" | tr ':' '\n' | sort | uniq`"
for i in ${HASH_ALGOS}; do
    got=0;
    for i2 in $my_path; do
        if [ -x "${i2}/${i}sum" ]; then
            ha="${ha} ${i} "
            got=1
            break
        fi
    done
    if [ $got -eq 0 ]; then
        bad="${bad} ${i}sum "
    fi
done
bad="`echo -n \"${bad}\" | sed -r 's, +, ,g' | tr ' ' '\n' | sort | uniq`"

if ! test -z "${bad}"; then
    echo -n "WARNING: following binaries: ${bad}" >&2
    echo '' >&2
    echo "does not exist in \$PATH, or you don't have +x permisssion!" >&2
fi

HASH_ALGOS=`echo -n "${ha}" | sed -r 's, +, ,g' | sed 's, ,\n,g' | \
    sort | uniq | tr '\n' ' '`

echo "Using algorithms:${HASH_ALGOS}"

this=`basename $0`

find . -type d | while read dn; do
    save_cwd="`pwd`"
    cd "$dn"
    for i1 in ${HASH_ALGOS}; do
        OUT="${OUT_PREFIX}.$i1"
        rm -f ${OUT} || exit 1
    done

    find . -maxdepth 1 -type f -o -type l | while read fn; do
        i2=`basename "$fn"`
        ok="yes"
        for i3 in ${EXCLUDE_PATTERNS}; do
            if [ $i2 == $i3 ]; then ok="no"; fi
        done
        if [ $ok = "yes" ]; then
           echo -n "hashing: $fn ... "
           for i1 in ${HASH_ALGOS}; do
                echo -n "${i1} "
                OUT="${OUT_PREFIX}.$i1"
                touch ${OUT} || exit 1
                ${i1}sum -b "$fn" >>${OUT} || exit 1
            done
            echo "DONE"
        fi
    done
    cd "${save_cwd}"
done

exit 0

#EOF