Emacs: Hippie Expand

hippie-expand is for expanding current word to any matching string that occurs in existing buffers.

You need to give it a key. e.g.

(global-set-key (kbd "C-t") 'hippie-expand)

[see Emacs: How to Define Keys]

Press once to expand. Press again to switch to next choice. Can be used anywhere, including in minibuffer.

Here's sample setup.

Put this in your emacs init file:

(setq hippie-expand-try-functions-list
      '(
        try-expand-dabbrev
        try-expand-dabbrev-all-buffers
        ;; try-expand-dabbrev-from-kill
        try-complete-lisp-symbol-partially
        try-complete-lisp-symbol
        try-complete-file-name-partially
        try-complete-file-name
        ;; try-expand-all-abbrevs
        ;; try-expand-list
        ;; try-expand-line
        ))