# usage: skip N [files...]
# skip n elements from input
function skip
    set -l n $argv[1]
    set argv $argv[2..-1]
    # tail -n +N+1 means start printing from line n+1
    tail -n + (math $n + 1) $argv
end

# usage: get N
# get specified line number from stdin
function get
    sed -n "$argv[1]p"
end

# usage: data_url FILE
# turn file into a data url
function data_url
    if test (count $argv) -eq 1
        set file_path $argv[1]
        if test -f $file_path
            # base64 output (base64 reads from stdin in fish with <)
            set base64_data (base64 < $file_path)
            set mime_type (file --mime-type -b $file_path)
            echo "data:$mime_type;base64,$base64_data"
        else
            echo "File not found: $file_path"
        end
    else
        echo "\$ data_url [FILE_PATH]"
        echo "Turn data into a data URL"
    end
end