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150 lines
5.0 KiB
150 lines
5.0 KiB
;;; cider-format.el --- Code and EDN formatting functionality -*- lexical-binding: t -*-
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;; Copyright © 2013-2019 Bozhidar Batsov, Artur Malabarba and CIDER contributors
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;;
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;; Author: Bozhidar Batsov <bozhidar@batsov.com>
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;; Artur Malabarba <bruce.connor.am@gmail.com>
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;; This program is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;; This file is not part of GNU Emacs.
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;;; Commentary:
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;; Middleware-powered code and EDN formatting functionality.
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;;; Code:
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(require 'map)
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(require 'seq)
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(require 'subr-x)
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(require 'cider-client)
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(require 'cider-util)
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;; Format
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(defun cider--format-reindent (formatted start)
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"Reindent FORMATTED to align with buffer position START."
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(let* ((start-column (save-excursion (goto-char start) (current-column)))
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(indent-line (concat "\n" (make-string start-column ? ))))
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(replace-regexp-in-string "\n" indent-line formatted)))
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;;; Format region
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(defun cider--format-region (start end formatter)
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"Format the contents of the given region.
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START and END represent the region's boundaries.
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FORMATTER is a function of one argument which is used to convert
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the string contents of the region into a formatted string.
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Uses the following heuristic to try to maintain point position:
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- Take a snippet of text starting at current position, up to 64 chars.
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- Search for the snippet, with lax whitespace, in the formatted text.
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- If snippet is less than 64 chars (point was near end of buffer), search
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from end instead of beginning.
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- Place point at match beginning, or `point-min' if no match."
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(let* ((original (buffer-substring-no-properties start end))
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(formatted (funcall formatter original))
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(indented (cider--format-reindent formatted start)))
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(unless (equal original indented)
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(let* ((pos (point))
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(pos-max (1+ (buffer-size)))
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(l 64)
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(endp (> (+ pos l) pos-max))
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(snippet (thread-last (buffer-substring-no-properties
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pos (min (+ pos l) pos-max))
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(regexp-quote)
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(replace-regexp-in-string "[[:space:]\t\n\r]+" "[[:space:]\t\n\r]*"))))
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(delete-region start end)
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(insert indented)
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(goto-char (if endp (point-max) (point-min)))
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(funcall (if endp #'re-search-backward #'re-search-forward) snippet nil t)
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(goto-char (or (match-beginning 0) start))
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(when (looking-at-p "\n") (forward-char))))))
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;;;###autoload
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(defun cider-format-region (start end)
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"Format the Clojure code in the current region.
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START and END represent the region's boundaries."
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(interactive "r")
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(cider-ensure-connected)
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(cider--format-region start end #'cider-sync-request:format-code))
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;;; Format defun
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;;;###autoload
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(defun cider-format-defun ()
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"Format the code in the current defun."
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(interactive)
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(cider-ensure-connected)
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(let ((defun-bounds (cider-defun-at-point 't)))
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(cider-format-region (car defun-bounds) (cadr defun-bounds))))
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;;; Format buffer
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(defun cider--format-buffer (formatter)
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"Format the contents of the current buffer.
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Uses FORMATTER, a function of one argument, to convert the string contents
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of the buffer into a formatted string."
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(cider--format-region 1 (1+ (buffer-size)) formatter))
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;;;###autoload
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(defun cider-format-buffer ()
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"Format the Clojure code in the current buffer."
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(interactive)
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(check-parens)
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(cider-ensure-connected)
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(cider--format-buffer #'cider-sync-request:format-code))
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;;; Format EDN
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;;;###autoload
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(defun cider-format-edn-buffer ()
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"Format the EDN data in the current buffer."
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(interactive)
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(check-parens)
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(cider-ensure-connected)
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(cider--format-buffer (lambda (edn)
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(cider-sync-request:format-edn edn fill-column))))
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;;;###autoload
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(defun cider-format-edn-region (start end)
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"Format the EDN data in the current region.
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START and END represent the region's boundaries."
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(interactive "r")
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(cider-ensure-connected)
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(let* ((start-column (save-excursion (goto-char start) (current-column)))
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(right-margin (- fill-column start-column)))
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(cider--format-region start end
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(lambda (edn)
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(cider-sync-request:format-edn edn right-margin)))))
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;;;###autoload
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(defun cider-format-edn-last-sexp ()
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"Format the EDN data of the last sexp."
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(interactive)
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(apply 'cider-format-edn-region (cider-sexp-at-point 'bounds)))
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(provide 'cider-format)
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;;; cider-format.el ends here
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