Feature Request: Function to quote filenames

[raman]

Feature Request:

Motivated by the  increasing number of filenames that show up with spc,
"'"  and other punctuation characters in their name.

The only helper function Emacs provides today is shell-quote-argument --
which often doesn't do the trick.

As an example: Given the filename:

Alice's Adventures in Wonderland

(setq f (shell-quote-argument "Alice's Adventures in Wonderland"))
returns 
"Alice\\'s\\ Adventures\\ in\\ Wonderland"

 But invocations like 
(shell-command (format "ls %s" f))

 throw an error 

it's never obvious what quoting magic to  use to get all the cases
right.

Would be nice if we had a shell-quote-filename elisp function that did
all of the magic quoting.


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