fish-shell/share/functions/__fish_urlencode.fish

function __fish_urlencode --description "URL-encode stdin"
    set -l join ''
    set -l chars
    # Set locale to C and IFS to "" in order to split a line into bytes.
    while begin
            set -lx LC_ALL C
            set -lx IFS ''
            read -az chars
        end
        printf '%s' $join
        # chomp off a trailing newline
        if test "$chars[-1]" = \n
            set -e chars[-1]
            set join '%0A%00'
        else
            set join '%00'
        end
        for c in $chars
            if string match -q -r '[/._~A-Za-z0-9-]' $c
                printf '%s' $c
            else
                printf '%%%02X' "'$c"
            end
        end
    end
end