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-;;; my-hiedb.el -- Extensions for hiedb -*- lexical-binding: t -*-
-
-;; Copyright (C) 2023 Free Software Foundation.
-
-;; Author: Yuchen Pei <id@ypei.org>
-;; Package-Requires: ((emacs "28.2"))
-
-;; This file is part of dotfiles.
-
-;; dotfiles is free software: you can redistribute it and/or modify it under
-;; the terms of the GNU Affero General Public License as published by
-;; the Free Software Foundation, either version 3 of the License, or
-;; (at your option) any later version.
-
-;; dotfiles 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 Affero General
-;; Public License for more details.
-
-;; You should have received a copy of the GNU Affero General Public
-;; License along with dotfiles. If not, see <https://www.gnu.org/licenses/>.
-
-;;; Commentary:
-
-;; Extensions for hiedb.
-
-;;; Code:
-
-;;; to use, do for example:
-;; (add-hook 'haskell-mode-hook
-;; (lambda ()
-;; (add-hook 'xref-backend-functions
-;; #'hiedb--xref-backend nil t)))
-
-(defun hiedb--xref-backend () 'hiedb)
-
-(cl-defmethod xref-backend-definitions
- ((_backend (eql hiedb)) _identifiers)
- (my-hiedb-call-point-defs buffer-file-name
- (1+ (current-line)) (1+ (current-column)))
- (my-hiedb-parse-point-defs-output
- (file-name-directory buffer-file-name)
- (with-current-buffer "*hiedb*"
- (goto-char (point-min)) (kill-line) (kill-line)
- (buffer-string))
- ))
-
-(defun my-hiedb-call-point-defs (file line col)
- (let ((dir (file-name-directory file))
- (module-name (file-name-base file)))
- (with-current-buffer (get-buffer-create "*hiedb*")
- (erase-buffer))
- (call-process "hiedb" nil "*hiedb*" nil
- "-D"
- (format "%sdefault.hiedb" dir)
- "point-defs" module-name
- (number-to-string line)
- (number-to-string col))))
-
-(defun my-hiedb-parse-point-defs-output (dir output)
- "module-name:line-begin:col-begin-line-end:col-end"
- (pcase-let ((`(,module-name ,line-beg ,col-beg, line-end, col-end)
- (split-string output "[:-]" (print output))))
- (list
- (xref-make-match
- "" (xref-make-file-location
- (format "%s%s.hs" dir module-name)
- (string-to-number line-beg)
- (string-to-number col-beg))
- (- (string-to-number col-end) (string-to-number col-beg))))))
-
-(provide 'my-hiedb)
-;;; my-hiedb.el ends here