my-tabs.el

;;; Tab management

;; Spaces instead of tabs
(setq-default indent-tabs-mode nil)

;; If there is a tab, make it the size of 2 spaces
(setq-default tab-width 2)

;; Mode specific indent sizes
;; TODO: Consider putting these in their own mode specific inits
(setq c-basic-offset 4)
(setq css-indent-offset 2)
(setq sh-basic-offset 2)
(set-default 'javascript-indent-level 2)

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;; Hippie expand.  Groovy vans with tie-dyes.

(setq hippie-expand-try-functions-list
      '(yas/hippie-try-expand
        try-expand-dabbrev
        try-expand-dabbrev-all-buffers
        try-expand-dabbrev-from-kill
        try-complete-file-name
        try-complete-lisp-symbol))

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;; Smart Tab

(defvar smart-tab-using-hippie-expand t
  "turn this on if you want to use hippie-expand completion.")

(defun smart-tab (prefix)
  "Needs `transient-mark-mode' to be on. This smart tab is
  minibuffer compliant: it acts as usual in the minibuffer.

  In all other buffers: if PREFIX is \\[universal-argument], calls
  `smart-indent'. Else if point is at the end of a symbol,
  expands it. Else calls `smart-indent'."
  (interactive "P")
  (labels ((smart-tab-must-expand (&optional prefix)
                                  (unless (or (consp prefix)
                                              mark-active)
                                    (looking-at "\\_>"))))
    (cond ((minibufferp)
           (minibuffer-complete))
          ((smart-tab-must-expand prefix)
           (if smart-tab-using-hippie-expand
               (hippie-expand prefix)
             (dabbrev-expand prefix)))
          ((smart-indent)))))

(defun smart-indent ()
  "Indents region if mark is active, or current line otherwise."
  (interactive)
  (if mark-active
    (indent-region (region-beginning)
                   (region-end))
    (indent-for-tab-command)))
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(global-set-key (kbd "TAB") 'smart-tab)