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;;; Clang-format emacs integration for use with C/Objective-C/C++.
;; This defines a function clang-format-region that you can bind to a key.
;; A minimal .emacs would contain:
;; (load "<path-to-clang>/tools/clang-format/clang-format.el")
;; (global-set-key [C-M-tab] 'clang-format-region)
;; Depending on your configuration and coding style, you might need to modify
;; 'style' in clang-format, below.
(require 'json)
;; *Location of the clang-format binary. If it is on your PATH, a full path name
;; need not be specified.
(defvar clang-format-binary "clang-format")
(defun clang-format-region ()
"Use clang-format to format the currently active region."
(let ((beg (if mark-active
(min (line-beginning-position) (1- (point-max)))))
(end (if mark-active
(clang-format beg end)))
(defun clang-format-buffer ()
"Use clang-format to format the current buffer."
(clang-format (point-min) (point-max)))
(defun clang-format (begin end)
"Use clang-format to format the code between BEGIN and END."
(let* ((orig-windows (get-buffer-window-list (current-buffer)))
(orig-window-starts (mapcar #'window-start orig-windows))
(orig-point (point))
(style "file"))
(call-process-region (point-min) (point-max) clang-format-binary
t (list t nil) nil
"-offset" (number-to-string (1- begin))
"-length" (number-to-string (- end begin))
"-cursor" (number-to-string (1- (point)))
"-assume-filename" (buffer-file-name)
"-style" style)
(goto-char (point-min))
(let ((json-output (json-read-from-string
(point-min) (line-beginning-position 2)))))
(delete-region (point-min) (line-beginning-position 2))
(goto-char (1+ (cdr (assoc 'Cursor json-output))))
(dotimes (index (length orig-windows))
(set-window-start (nth index orig-windows)
(nth index orig-window-starts)))))))