fish functions that wrap cp/mv for backup/restore of files/directories

bak.fish

function _bak_help
    echo "Usage: bak|unbak <file/dir> [suffix]"
    echo "  bak:    Copy <file/dir> to <file/dir><suffix> (default: .bak)"
    echo "  unbak:  Copy <file/dir><suffix> to <file/dir> (default: .bak)"
end

function bak
    if test "$argv[1]" = "-h"
        _bak_help
        return
    end

    set -l file $argv[1]
    set -lq suffix $argv[2]
    or set -l suffix '.bak'
    set -l bakfile $file$suffix

    cp -ri $file $bakfile
end

function unbak
    if test "$argv[1]" = "-h"
        _bak_help
        return
    end

    set -l file $argv[1]
    set -lq suffix $argv[2]
    or set -l suffix '.bak'
    set -l bakfile $file$suffix

    if test -e $bakfile
        mv $bakfile $file
    else
       echo "Backup file does not exist: $bakfile"
    end
end