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#!/usr/bin/env sh
# Description: Create and verify checksums
#
# For selection: it will generate one file containing the checksums with file names
# [and with paths if they are in another directory]
# the output checksum filename will be checksum_timestamp.checksum_type
# For file: if the file is a checksum, the plugin does the verification
# if the file is not a checksum, checksum will be generated for it
# the output checksum filename will be filename.checksum_type
# For directory: recursively calculates checksum for all the files in the directory
# the output checksum filename will be directory.checksum_type
#
# Shell: POSIX compliant
# Author: ath3, Arun Prakash Jana
selection=${XDG_CONFIG_HOME:-$HOME/.config}/nnn/.selection
resp=f
chsum=md5
checksum_type()
{
echo "possible checksums: md5, sha1, sha224, sha256, sha384, sha512"
printf "create md5 (m), sha256 (s), sha512 (S) (or type one of the above checksums) [default=m]: "
read -r chsum_resp
for chks in md5 sha1 sha224 sha256 sha384 sha512
do
if [ "$chsum_resp" = "$chks" ]; then
chsum=$chsum_resp
return
fi
done
if [ "$chsum_resp" = "s" ]; then
chsum=sha256
elif [ "$chsum_resp" = "S" ]; then
chsum=sha512
fi
}
if [ -s "$selection" ]; then
printf "work with selection (s) or current file (f) [default=f]: "
read -r resp
fi
if [ "$resp" = "s" ]; then
checksum_type
sed 's|'"$PWD/"'||g' < "$selection" | xargs -0 -I{} ${chsum}sum {} > "checksum_$(date '+%Y%m%d%H%M').$chsum"
elif [ -n "$1" ]; then
if [ -f "$1" ]; then
for chks in md5 sha1 sha224 sha256 sha384 sha512
do
if echo "$1" | grep -q \.${chks}$; then
${chks}sum -c < "$1"
read -r _
return
fi
done
checksum_type
file=$(basename "$1").$chsum
${chsum}sum "$1" > "$file"
elif [ -d "$1" ]; then
checksum_type
file=$(basename "$1").$chsum
find "$1" -type f -exec ${chsum}sum "{}" + > "$file"
fi
fi
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