These functions write a URL (or file name) to another buffer.
If writing to a buffer in another session, the functions write the URL after the current line.

The functions behave differently.
If the current buffer is a web page and the current line contains one or more links,
the `u` function writes the URL of the current page and the `url` function writes the URLs of the links.
If the current buffer is a directory,
the `u` function writes the path of the current file in that directory and the `url` function writes the path of the directory.

    # Write the file name to a buffer.
    # usage: <u [<session>]
    function+u {
    db0
    H-
    ebvar+
    lsX
    if(*) {
    ![ -z "~0" ]
    if(*) {
    ebvar-
    enew
    r !echo '_/'.
    bw
    } else {
    ebvar-
    e~0
    r !echo '_/'.
    eret
    }
    } else {
    ![ -z "~0" ]
    if(*) {
    ebvar-
    enew
    r !echo "$EB_BASE"
    bw
    } else {
    ebvar-
    e~0
    r !echo "$EB_BASE"
    eret
    }
    }
    }

    # Write the current URL.
    # usage <url [session or file]
    function:url {
    db0
    A
    if(?) {
    h
    } else {
    # Remove surrounding HTML code.
    g/^<br><a href='.*'>$/f +,+2d
    ,s/^<br><a href='\(.*\)'>$/$1/f
    # Replace character entity references.
    ,s/&apos;/'/gf
    ,s/&amp;/\&/gf
    bw
    w~0@.
    if(*) {
    ^
    } else {
    w~0
    if(*) {
    ^
    } else {
    w+ ~0
    if(*) {
    ^
    }
    }
    }
    }
    }