So there is ido-completing-read that seems perfect to assign to completing-read-function. There is no customization interface though.

How is the user supposed to enable ido-completing-read for all completing reads?

  • Have a look at the Emacswiki page for Ido for details. – Dan Aug 24 '15 at 20:05
  • Emacswiki page does not mention completing-read-function so I guess wiki is older than the function (it uses defadvice). Does not really answer my question.... – Gracjan Polak Aug 24 '15 at 20:32
  • Did you try turning on ido? – Dan Aug 24 '15 at 20:33
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    Hmm... you could either try the package ido-ubiquitous, or else just set the variable by hand: (setq completing-read-function #'completing-read-ido). – Dan Aug 24 '15 at 20:43
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    (setq completing-read-function #'completing-read-ido) won't work because completing-read-ido doesn't handle all the different collection types that completing-read-function might receive (bug#15430). – npostavs Aug 24 '15 at 22:41

Seems that convetions is to provide a customization per each package separatelly:

  • Org Mode: (setq org-completion-use-ido t)
  • Magit: (setq magit-completing-read-function 'magit-ido-completing-read)
  • Gnus: (setq gnus-completing-read-function 'gnus-ido-completing-read)

Or use https://github.com/DarwinAwardWinner/ido-ubiquitous that tries to do the correct thing always.

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    This is not a convention it's rather that some packages support it while ido-ubiquitous is just a hack to use ido wherever possible. – Mark Karpov Aug 24 '15 at 21:04

Basic setup is just:

 ido-create-new-buffer    'always
 ido-enable-flex-matching t
 ido-everywhere           t)

(ido-mode 1) ; ido for switch-buffer and find-file

Next, to use it everywhere install ido-ubiquitous and activate it:

(ido-ubiquitous-mode 1) ; use IDO everywhere

ido-vertical is highly recommended:

(setq ido-vertical-define-keys 'C-n-and-C-p-only)

(ido-vertical-mode 1) ; display IDO vertically

Don't forget about Smex.

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