Upon further investigation, it appears simple to just use the piece of
shell-command.el that displays the current directory in the prompt:
(require 'shell-command)
(defadvice read-shell-command (before
shell-command-add-directory-to-prompt
(prompt &rest r)
activate)
"adds the current path to the shell-command minibuffer prompt"
(let ((footer (shell-command-make-prompt-string " [%w]%$ "
default-directory)))
(and (string-match ": $" prompt)
(setq prompt (replace-match footer t t prompt)))))
However, the tab-completion functionality of that file is broken in emacs24 and
unnecessary in both emacs23 and emacs24. At the very least, its documentation
should be changed to reflect this fact.
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