Looks nice, doesn’t it?
First you need to install bash-completion mode which will improve shell-mode completion by using bash’s completion support. Note that, at this moment bash-completion mode doesn’t work for me (bash –version = 4.3.11). This is probably the case for you as well. No worries, there is a fix that is not merged to master branch yet. You need to get complete_D branch and install that one.[Now it’s merged] Follow the setup instructions given in README file. And continue below.
Add below lines to your .emacs file:
(defun ac-bash-candidates ()
"This function is a modifed version of
bash-completion-dynamic-complete from bash-completion.el"
(when bash-completion-enabled
(let* ( (start (comint-line-beginning-position))
(pos (point))
(tokens (bash-completion-tokenize start pos))
(open-quote (bash-completion-tokenize-open-quote tokens))
(parsed (bash-completion-process-tokens tokens pos))
(line (cdr (assq 'line parsed)))
(point (cdr (assq 'point parsed)))
(cword (cdr (assq 'cword parsed)))
(words (cdr (assq 'words parsed)))
(stub (nth cword words))
(completions (bash-completion-comm line point words cword open-quote))
;; Override configuration for comint-dynamic-simple-complete.
;; Bash adds a space suffix automatically.
(comint-completion-addsuffix nil) )
(if completions
completions))))
(setq ac-source-bash
'((candidates . ac-bash-candidates)))
(add-hook 'shell-mode-hook
(lambda()
(setq ac-sources '(ac-source-bash))
(auto-complete-mode)))
If you noticed I have actually used bash-completion-dynamic-complete from bash-completion.el.