This package provides a command to restrict minibuffer completion to the current completion candidates. This is something several completion frameworks provide: Icicles, Ido, Ivy, Helm, Selectrum all have it. It enables fast out-of-order matching. This package is completion framework agnostic and can be used, for example, with the default minibuffer tab completion, or with Icomplete, which don’t have such a feature.
To use, simply bind restricto-narrow in
minibuffer-local-completion-map. If you want to be able undo
restriction, enable restricto-mode and also bind restricto-widen.
The restricto-mode global minor mode will also detect if you use
minibuffer-electric-default-mode and in that case ensure the default
prompt does not reappear upon restricting.
Sample configuration (put restricto.el somewhere in your load-path):
(require 'restricto)
(restricto-mode)
(define-key minibuffer-local-completion-map (kbd "C-SPC") #'restricto-narrow)
(define-key minibuffer-local-completion-map (kbd "M-SPC") #'restricto-widen)