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/usr/share/emacs/site-lisp/ocp-indent.el is in ocp-indent 1.5.3-1+b1.

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The actual contents of the file can be viewed below.

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;;; ocp-indent.el --- automatic indentation with ocp-indent
;;
;; Copyright 2012-2013 OCamlPro

;; Keywords: ocaml languages
;; URL: http://www.typerex.org/ocp-indent.html

;; All rights reserved.This file is distributed under the terms of the
;; GNU Lesser General Public License version 3.0 with linking
;; exception.

;; TypeRex is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; Lesser GNU General Public License for more details.
;;

;;; Commentary:

;; Description:
;; ocp-indent is a simple tool and library to indent OCaml code.

;; Installation:
;; You need ocp-indent installed on you system to work.

;; Usage:
;; Eval this file to automatically use ocp-indent on caml/tuareg buffers.

;;; Code:

(require 'cl)

(defgroup ocp-indent nil
  "ocp-indent OCaml indenter binding configuration"
  :group 'languages)

(defcustom ocp-indent-path "ocp-indent"
  "*Path to access the ocp-indent command"
  :group 'ocp-indent :type '(file))

(defcustom ocp-indent-config nil
  "*Ocp-indent config string, as for its --config option.
WARNING: DEPRECATED, this will override any user or project
ocp-indent configuration files"
  :group 'ocp-indent
  :type '(choice (const nil) (string)))

(defcustom ocp-indent-syntax nil
  "*Enabled syntax extensions for ocp-indent (see option --syntax)"
  :group 'ocp-indent
  :type '(repeat string))

(defcustom ocp-indent-allow-tabs nil
  "*Allow indent-tabs-mode in ocaml buffers. Not recommended, won't work well."
  :group 'ocp-indent
  :type '(bool))

(defun ocp-in-indentation-p ()
  "Tests whether all characters between beginning of line and point
are blanks."
  (save-excursion
    (skip-chars-backward " \t")
    (bolp)))

(defun ocp-indent-args (start-line end-line)
  (append
   (list "--numeric"
         "--lines" (format "%d-%d" start-line end-line))
   (if ocp-indent-config (list "--config" ocp-indent-config) nil)
   (reduce (lambda (acc syn) (list* "--syntax" syn acc))
           ocp-indent-syntax :initial-value nil)))

(defun ocp-indent-file-to-string (file)
  (replace-regexp-in-string
   "\n$" ""
   (with-temp-buffer (insert-file-contents file)
                     (buffer-string))))

(defun ocp-indent-region (start end)
  (interactive "r")
  (let*
      ((start-line (line-number-at-pos start))
       (end-line (line-number-at-pos end))
       (errfile (expand-file-name (make-temp-name "ocp-indent-error")
                                  temporary-file-directory))
       (indents-str
        (with-output-to-string
          (if (/= 0
                  (apply 'call-process-region
                         (point-min) (point-max) ocp-indent-path nil
                         (list standard-output errfile) nil
                         (ocp-indent-args start-line end-line)))
              (error "Can't indent: %s returned failure" ocp-indent-path))))
       (indents (mapcar 'string-to-number (split-string indents-str))))
    (when (file-exists-p errfile)
      (message (ocp-indent-file-to-string errfile))
      (delete-file errfile))
    (save-excursion
      (goto-char start)
      (mapcar
       #'(lambda (indent) (indent-line-to indent) (forward-line))
       indents))
    (when (ocp-in-indentation-p) (back-to-indentation))))

(defun ocp-indent-line ()
  (interactive nil)
  (ocp-indent-region (point) (point)))

(defun ocp-indent-buffer ()
  (interactive nil)
  (ocp-indent-region 0 (buffer-size)))

;;;###autoload
(defun ocp-setup-indent ()
  (interactive nil)
  (unless (and (buffer-file-name)
               (string= (file-name-extension (buffer-file-name)) "mly"))
    (unless ocp-indent-allow-tabs (set 'indent-tabs-mode nil))
    (when (string= (file-name-extension (buffer-file-name)) "mll")
      (set (make-local-variable 'ocp-indent-syntax)
           (cons "mll" ocp-indent-syntax)))
    (set (make-local-variable 'indent-line-function) #'ocp-indent-line)
    (set (make-local-variable 'indent-region-function) #'ocp-indent-region)))

;;;###autoload
(defun ocp-indent-caml-mode-setup ()
  (ocp-setup-indent)
  (local-unset-key "\t"))  ;; caml-mode rebinds TAB !

(add-hook 'tuareg-mode-hook 'ocp-setup-indent t)

(add-hook 'caml-mode-hook 'ocp-indent-caml-mode-setup  t)

(provide 'ocp-indent)

;;; ocp-indent.el ends here