;;; smartparens-elixir.el --- Configuration for Elixir. -*- lexical-binding: t; -*-
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;; Copyright (C) 2017 Matúš Goljer
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;; Author: Matúš Goljer <matus.goljer@gmail.com>
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;; Maintainer: Matúš Goljer <matus.goljer@gmail.com>
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;; Version: 0.0.1
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;; Created: 15th January 2017
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;; Keywords: languages
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;; This program is free software; you can redistribute it and/or
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;; modify it under the terms of the GNU General Public License
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;; as published by the Free Software Foundation; either version 3
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;; of the License, or (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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;;; Commentary:
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;;; Code:
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(require 'smartparens)
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(--each '(elixir-mode)
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(add-to-list 'sp-sexp-suffix (list it 'regexp "")))
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(defun sp-elixir-def-p (id)
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"Return non-nil if the \"do\" keyword is part of definition.
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ID is the opening delimiter.
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Definitions are the constructions of the form defmodule-do-end,
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def-do-end and similar pairs."
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(save-excursion
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(when (equal "do" id)
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(back-to-indentation)
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(looking-at (regexp-opt '(
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"defmodule"
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"defmacro"
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"defmacrop"
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"quote"
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"def"
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"defp"
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"if"
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"unless"
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"case"
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"cond"
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"with"
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"for"
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"receive"
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"try"
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))))))
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(defun sp-elixir-skip-def-p (ms _mb _me)
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"Test if \"do\" is part of definition.
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MS, MB, ME."
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(sp-elixir-def-p ms))
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(defun sp-elixir-do-block-post-handler (_id action _context)
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"Insert \"do\" keyword and indent the new block.
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ID, ACTION, CONTEXT."
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(when (eq action 'insert)
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(let ((m (make-marker)))
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(save-excursion
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(forward-word) ;; over the "end"
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(move-marker m (point)))
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(save-excursion (newline))
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(save-excursion (insert " do"))
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(indent-region (line-beginning-position) m)
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(move-marker m nil nil))))
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(defun sp-elixir-empty-do-block-post-handler (_id action _context)
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"Insert empty \"do\" keyword and indent the new block.
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This is used for receive-do-end expression.
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ID, ACTION, CONTEXT."
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(when (eq action 'insert)
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(let ((m (make-marker)))
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(save-excursion
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(forward-word) ;; over the "end"
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(move-marker m (point)))
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(save-excursion
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(forward-line -1)
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(end-of-line)
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(insert " do"))
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(save-excursion (newline))
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(indent-region (line-beginning-position) m)
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(indent-according-to-mode)
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(move-marker m nil nil))))
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(sp-with-modes 'elixir-mode
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(sp-local-pair "do" "end"
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:when '(("SPC" "RET" "<evil-ret>"))
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:skip-match 'sp-elixir-skip-def-p
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:unless '(sp-in-comment-p sp-in-string-p))
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(sp-local-pair "def" "end"
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:when '(("SPC" "RET" "<evil-ret>"))
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:post-handlers '(sp-elixir-do-block-post-handler)
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:unless '(sp-in-comment-p sp-in-string-p))
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(sp-local-pair "defp" "end"
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:when '(("SPC" "RET" "<evil-ret>"))
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:post-handlers '(sp-elixir-do-block-post-handler)
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:unless '(sp-in-comment-p sp-in-string-p))
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(sp-local-pair "defmodule" "end"
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:when '(("SPC" "RET" "<evil-ret>"))
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:post-handlers '(sp-elixir-do-block-post-handler)
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:unless '(sp-in-comment-p sp-in-string-p))
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(sp-local-pair "fn" "end"
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:when '(("SPC" "RET" "<evil-ret>"))
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:post-handlers '("| "))
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(sp-local-pair "if" "end"
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:when '(("SPC" "RET" "<evil-ret>"))
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:post-handlers '(sp-elixir-do-block-post-handler)
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:unless '(sp-in-comment-p sp-in-string-p))
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(sp-local-pair "unless" "end"
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:when '(("SPC" "RET" "<evil-ret>"))
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:post-handlers '(sp-elixir-do-block-post-handler)
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:unless '(sp-in-comment-p sp-in-string-p))
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(sp-local-pair "case" "end"
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:when '(("SPC" "RET" "<evil-ret>"))
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:post-handlers '(sp-elixir-do-block-post-handler)
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:unless '(sp-in-comment-p sp-in-string-p))
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(sp-local-pair "receive" "end"
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:when '(("RET" "<evil-ret>"))
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:post-handlers '(sp-elixir-empty-do-block-post-handler))
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)
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(provide 'smartparens-elixir)
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;;; smartparens-elixir.el ends here
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