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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
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