;;; smartparens-haskell.el --- Additional configuration for Haskell based modes. -*- lexical-binding: t; -*-
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;; Copyright (C) 2015 Michael Xavier
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;; Author: Michael Xavier <michael@michaelxavier.net>
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;; Maintainer: Michael Xavier <michael@michaelxavier.net>
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;; Created: 29 Apr 2016
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;; Keywords: abbrev convenience editing
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;; URL: https://github.com/Fuco1/smartparens
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;; This file is not part of GNU Emacs.
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;;; License:
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;; This file is part of Smartparens.
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;; Smartparens 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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;; Smartparens 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 Smartparens. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This file provides some additional configuration for Haskell based
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;; modes. To use it, simply add:
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;;
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;; (require 'smartparens-haskell)
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;;
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;; into your configuration. You can use this in conjunction with the
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;; default config or your own configuration.
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;; If you have good ideas about what should be added please file an
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;; issue on the github tracker.
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;; For more info, see github readme at
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;; https://github.com/Fuco1/smartparens
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;;; Code:
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(require 'smartparens)
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(defun sp-haskell-skip-apostrophe (_ms mb _me)
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(save-excursion
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;; We test the syntax class because haskell mode overrides
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;; the class for ' on the fly when it run the syntax pass of
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;; font-lock... so that if '' is a valid string (char) it
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;; gets an override via 'syntax-table property. In which
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;; case we just agree with haskell mode and let it be used as
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;; a pair.
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(not (eq (syntax-class (syntax-after mb)) 7))))
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(defun sp-haskell-strict-ignore-apostrophe-after-word (_id action _context)
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"Ignore trailing ' when navigating.
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Because ' in haskell is symbol class it gets picked up as part of
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a words such as myFunction', and then strict mode won't allow us
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to delete it. Also show-smartparens-mode incorrectly highlights
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it as missing an opener.
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So we ignore that pair when at the end of word."
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(when (eq action 'navigate)
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(sp--looking-back-p (concat "\\(\\sw\\|\\s_\\)'+"))))
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(sp-with-modes '(haskell-mode haskell-interactive-mode)
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(sp-local-pair "{-" "-}")
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(sp-local-pair "{-#" "#-}")
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(sp-local-pair "{-@" "@-}")
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(sp-local-pair "'" nil
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:unless '(sp-point-after-word-p
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sp-haskell-strict-ignore-apostrophe-after-word)
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:skip-match 'sp-haskell-skip-apostrophe)
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(sp-local-pair "\\(" nil :actions nil))
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(defun sp--inferior-haskell-mode-backward-bound-fn ()
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"Limit the backward search to the prompt if point is on prompt."
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(-when-let (limit (cond ((bound-and-true-p comint-last-prompt)
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(marker-position (cdr comint-last-prompt)))
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((bound-and-true-p comint-last-prompt-overlay)
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(overlay-end comint-last-prompt-overlay))
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(t nil)))
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(and (> (point) limit) limit)))
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(defun sp--inferior-haskell-mode-forward-bound-fn ()
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"Limit the forward search to exclude the prompt if point is before prompt."
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(-when-let (limit (cond ((bound-and-true-p comint-last-prompt)
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(marker-position (car comint-last-prompt)))
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((bound-and-true-p comint-last-prompt-overlay)
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(overlay-start comint-last-prompt-overlay))
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(t nil)))
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(and (< (point) limit) limit)))
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(defun sp--setup-inferior-haskell-mode-search-bounds ()
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"Setup the search bound.
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If the point is after the last prompt, limit the backward search
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only for the propmt.
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If the point is before the last prompt, limit the forward search up until the prompt start."
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(setq sp-forward-bound-fn 'sp--inferior-haskell-mode-forward-bound-fn)
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(setq sp-backward-bound-fn 'sp--inferior-haskell-mode-backward-bound-fn))
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(add-hook 'inferior-haskell-mode-hook 'sp--setup-inferior-haskell-mode-search-bounds)
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(provide 'smartparens-haskell)
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;;; smartparens-haskell.el ends here
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