Fish script to convert RAR to ZIP

rar2zip.fish

#!/bin/fish

# rar2zip.fish

function usage
        printf "
Usage: rar2zip.fish [Only one RAR file]

Transforms a single RAR file, passed under cmdline, to an equivalent ZIP file,
storing it in the current directory"
end

# TODO: test for only one directory
function cleanup
    echo "Cleaning $argv.."
    rm -rfv $argv
end

trap 'cleanup $TMPDIR' 2 15

if math (count $argv) != 1 > /dev/null
        usage
        exit 1
end

set CWD (pwd)
set TMPDIR (mktemp -d -p /tmp/ rar2zip.XXXXXX)
if test "$TMPDIR" = ""
        echo "Error creating temporary dir!"
        exit 1
end

set rarfile (realpath $argv)
set BASENAME (basename $rarfile)
set DIRNAME (dirname $rarfile)

set FILENAME "$DIRNAME/$BASENAME"
set ZIPNAME ""(echo $BASENAME|sed -e's/\.[a-zA-Z0-9]\{1,\}$/\.zip/g')""
        
if [ (file $FILENAME | grep -c -e'RAR') != 1 ]
        echo "$FILENAME doesn't appear to be a RAR archive!"
        cleanup $TMPDIR
        exit 1
end

cd $TMPDIR
rm -fr "$BASENAME"-dir
mkdir -p "$BASENAME"-dir
cd "$BASENAME"-dir
unar "$FILENAME"
zip -0 -r ../"$ZIPNAME" .
cd ..
mv $ZIPNAME $CWD
cleanup $TMPDIR