🚀 go-pugleaf

What am I doing wrong here?  I'm a novice elisp programmer, I've
studied the manual, and I'm stuck.

I don't like how generate-new-buffer adds <1>, <2>, etc. to buffers
with duplicate filenames.  The number doesn't tell me what file I'm
editing!  It's overkill to use

(setq-default mode-line-buffer-identification '("Emacs: %17f"))

which puts the buffer-file-name (i.e. the full path name) in the mode
line, because it takes a lot of room in the mode line and isn't
necessary for most buffers.  So I tried to get fancy and put this in
my .emacs file:

(setq find-file-hooks '(lambda ()
         (if (string-match "<[0-9]*>" (buffer-name))
             (setq mode-line-buffer-identification
                   '("Emacs: %17f"))
             (setq mode-line-buffer-identification
                   '("Emacs: %17b")))))

This (I thought) would change the mode line to have the full path if
the buffer name had the <2> in its name.  Unfortunately, when I try to
run find-file it beeps with the following error message in the
minibuffer:

Symbol's function definition is void: lambda

Anyone have any ideas?  Grep couldn't find the defun for
generate-new-buffer in the lisp/*.el files, so I suspect it's in the
C-code.  Otherwise I would try to change that.  Thanks for any advice.

David
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