Revert of Revert of Add clang-format binaries and scripts for all platforms

third_party/clang_format/scripts/clang-format.el

+;;; 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."
+  (interactive)
+  (let ((beg (if mark-active
+                 (region-beginning)
+               (min (line-beginning-position) (1- (point-max)))))
+        (end (if mark-active
+                 (region-end)
+               (line-end-position))))
+    (clang-format beg end)))
+
+(defun clang-format-buffer ()
+  "Use clang-format to format the current buffer."
+  (interactive)
+  (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"))
+    (unwind-protect
+        (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
+                           (buffer-substring-no-properties
+                             (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)))))))