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+;;; cider-format.el --- Code and EDN formatting functionality -*- lexical-binding: t -*-
+
+;; Copyright © 2013-2018 Bozhidar Batsov, Artur Malabarba and CIDER contributors
+;;
+;; Author: Bozhidar Batsov <bozhidar@batsov.com>
+;;         Artur Malabarba <bruce.connor.am@gmail.com>
+
+;; This program is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program 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
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;; This file is not part of GNU Emacs.
+
+;;; Commentary:
+
+;; Middleware-powered code and EDN formatting functionality.
+
+;;; Code:
+
+(require 'subr-x)
+
+(require 'cider-client)
+(require 'cider-util)
+
+
+;; Format
+
+(defun cider--format-reindent (formatted start)
+  "Reindent FORMATTED to align with buffer position START."
+  (let* ((start-column (save-excursion (goto-char start) (current-column)))
+         (indent-line (concat "\n" (make-string start-column ? ))))
+    (replace-regexp-in-string "\n" indent-line formatted)))
+
+
+;;; Format region
+
+(defun cider--format-region (start end formatter)
+  "Format the contents of the given region.
+
+START and END represent the region's boundaries.
+
+FORMATTER is a function of one argument which is used to convert
+the string contents of the region into a formatted string.
+
+Uses the following heuristic to try to maintain point position:
+
+- Take a snippet of text starting at current position, up to 64 chars.
+- Search for the snippet, with lax whitespace, in the formatted text.
+  - If snippet is less than 64 chars (point was near end of buffer), search
+    from end instead of beginning.
+- Place point at match beginning, or `point-min' if no match."
+  (let* ((original (buffer-substring-no-properties start end))
+         (formatted (funcall formatter original))
+         (indented (cider--format-reindent formatted start)))
+    (unless (equal original indented)
+      (let* ((pos (point))
+             (pos-max (1+ (buffer-size)))
+             (l 64)
+             (endp (> (+ pos l) pos-max))
+             (snippet (thread-last (buffer-substring-no-properties
+                                    pos (min (+ pos l) pos-max))
+                        (replace-regexp-in-string "[[:space:]\t\n\r]+" "[[:space:]\t\n\r]*"))))
+        (delete-region start end)
+        (insert indented)
+        (goto-char (if endp (point-max) (point-min)))
+        (funcall (if endp #'re-search-backward #'re-search-forward) snippet nil t)
+        (goto-char (or (match-beginning 0) start))
+        (when (looking-at-p "\n") (forward-char))))))
+
+;;;###autoload
+(defun cider-format-region (start end)
+  "Format the Clojure code in the current region.
+START and END represent the region's boundaries."
+  (interactive "r")
+  (cider-ensure-connected)
+  (cider--format-region start end #'cider-sync-request:format-code))
+
+
+;;; Format defun
+
+;;;###autoload
+(defun cider-format-defun ()
+  "Format the code in the current defun."
+  (interactive)
+  (cider-ensure-connected)
+  (save-excursion
+    (mark-defun)
+    (cider-format-region (region-beginning) (region-end))))
+
+
+;;; Format buffer
+
+(defun cider--format-buffer (formatter)
+  "Format the contents of the current buffer.
+
+Uses FORMATTER, a function of one argument, to convert the string contents
+of the buffer into a formatted string."
+  (cider--format-region 1 (1+ (buffer-size)) formatter))
+
+;;;###autoload
+(defun cider-format-buffer ()
+  "Format the Clojure code in the current buffer."
+  (interactive)
+  (check-parens)
+  (cider-ensure-connected)
+  (cider--format-buffer #'cider-sync-request:format-code))
+
+
+;;; Format EDN
+
+(declare-function cider--pretty-print-width "cider-repl")
+
+;;;###autoload
+(defun cider-format-edn-buffer ()
+  "Format the EDN data in the current buffer."
+  (interactive)
+  (check-parens)
+  (cider-ensure-connected)
+  (cider--format-buffer (lambda (edn)
+                          (cider-sync-request:format-edn edn (cider--pretty-print-width)))))
+
+;;;###autoload
+(defun cider-format-edn-region (start end)
+  "Format the EDN data in the current region.
+START and END represent the region's boundaries."
+  (interactive "r")
+  (cider-ensure-connected)
+  (let* ((start-column (save-excursion (goto-char start) (current-column)))
+         (right-margin (- (cider--pretty-print-width) start-column)))
+    (cider--format-region start end
+                          (lambda (edn)
+                            (cider-sync-request:format-edn edn right-margin)))))
+
+;;;###autoload
+(defun cider-format-edn-last-sexp ()
+  "Format the EDN data of the last sexp."
+  (interactive)
+  (apply 'cider-format-edn-region (cider-sexp-at-point 'bounds)))
+
+(provide 'cider-format)
+;;; cider-format.el ends here