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;;; hcel-minor.el --- hcel-minor mode for definitions, references and eldoc. -*- lexical-binding: t; -*-
;; Copyright (C) 2022 Free Software Foundation, Inc.
;;
;; This file is part of hcel.
;;
;; hcel 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.
;;
;; hcel 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 hcel. If not, see <https://www.gnu.org/licenses/>.
(require 'hcel-source)
(require 'hcel-results)
(require 'hcel-outline)
(defvar hcel-minor-major-modes
'(hcel-outline-mode hcel-ids-mode)
"Major modes where hcel-minor mode can live in.")
(defvar hcel-minor-mode-map
(let ((kmap (make-sparse-keymap)))
(define-key kmap (kbd "M-?") #'hcel-minor-find-references-at-point)
kmap))
(define-minor-mode hcel-minor-mode
"A minor mode for exploring haskell codebases."
:lighter " hcel-minor"
(add-hook 'xref-backend-functions
#'hcel-minor--xref-backend nil t)
(cond
((null hcel-minor-mode)
(remove-hook 'eldoc-documentation-functions #'hcel-minor-eldoc-id-type t)
(remove-hook 'eldoc-documentation-functions #'hcel-minor-eldoc-docs t))
((not (or (apply 'derived-mode-p hcel-minor-major-modes)
(eq (current-buffer) eldoc--doc-buffer)))
(setq hcel-minor-mode nil)
(error "Not in one of the supported modes (%s) or the eldoc buffer."
(mapconcat #'prin1-to-string hcel-minor-major-modes
", ")))
(t
(add-hook
'eldoc-documentation-functions #'hcel-minor-eldoc-docs nil t)
(add-hook
'eldoc-documentation-functions #'hcel-minor-eldoc-id-type nil t)
(setq-local eldoc-documentation-strategy 'eldoc-documentation-compose))))
(defun hcel-minor-find-references-at-point ()
(interactive)
(cond ((or (derived-mode-p 'hcel-outline-mode)
(eq (current-buffer) eldoc--doc-buffer))
(hcel-find-references-internal
(hcel-text-property-near-point 'package-id)
(hcel-text-property-near-point 'module-path)
(hcel-text-property-near-point 'internal-id)))
((derived-mode-p 'hcel-ids-mode)
(hcel-find-references-internal
(alist-get 'packageId (hcel-text-property-near-point 'location-info))
(alist-get 'modulePath (hcel-text-property-near-point 'location-info))
(hcel-text-property-near-point 'internal-id)))
(t (error "%S not supported and not in eldoc doc buffer." major-mode))))
(defun hcel-minor-eldoc-id-type (cb)
(when-let* ((internal-id (hcel-text-property-near-point 'internal-id))
(symbol (save-excursion
(buffer-substring-no-properties
(progn
(text-property-search-backward
'internal-id internal-id 'equal)
(point))
(progn
(text-property-search-forward
'internal-id internal-id 'equal)
(point)))))
(docstring
(cond ((derived-mode-p 'hcel-outline-mode)
(hcel-render-type-internal
(hcel-text-property-near-point 'package-id)
(hcel-text-property-near-point 'module-path)
internal-id))
((derived-mode-p 'hcel-ids-mode)
(hcel-render-type-internal
(alist-get 'packageId (hcel-text-property-near-point 'location-info))
(alist-get 'modulePath (hcel-text-property-near-point 'location-info))
internal-id))
(t nil))))
(funcall cb docstring
:thing symbol
:face 'font-lock-variable-name-face)
(with-current-buffer eldoc--doc-buffer
(hcel-minor-mode 1))))
(defun hcel-minor-eldoc-docs (cb)
(when-let* ((docstring
(cond ((derived-mode-p 'hcel-outline-mode)
(hcel-id-docs-internal
(hcel-text-property-near-point 'package-id)
(hcel-text-property-near-point 'module-path)
(hcel-text-property-near-point 'internal-id)))
((derived-mode-p 'hcel-ids-mode)
(hcel-id-docs-internal
(alist-get 'packageId (hcel-text-property-near-point 'location-info))
(alist-get 'modulePath (hcel-text-property-near-point 'location-info))
(hcel-text-property-near-point 'internal-id)))
(t nil))))
(setq this-command nil)
(funcall cb docstring)
(with-current-buffer eldoc--doc-buffer
(hcel-minor-mode))))
(add-hook 'hcel-ids-mode-hook (lambda () (hcel-minor-mode 1)))
(add-hook 'hcel-outline-mode-hook (lambda () (hcel-minor-mode 1)))
(add-hook 'hcel-eldoc-hook (lambda ()
(with-current-buffer eldoc--doc-buffer
(hcel-minor-mode 1))))
(defun hcel-minor--xref-backend () 'hcel-minor-xref)
(cl-defmethod xref-backend-definitions ((_backend (eql hcel-minor-xref)) _identifiers)
(hcel-minor-find-definition-at-point))
(defun hcel-minor-find-definition-at-point ()
(interactive)
(cond ((or (derived-mode-p 'hcel-outline-mode)
(eq (current-buffer) eldoc--doc-buffer))
(hcel-find-definition-internal
(hcel-text-property-near-point 'package-id)
(hcel-text-property-near-point 'module-path)
(hcel-text-property-near-point 'internal-id)))
((derived-mode-p 'hcel-ids-mode)
(hcel-find-definition-internal
(alist-get 'packageId (hcel-text-property-near-point 'location-info))
(alist-get 'modulePath (hcel-text-property-near-point 'location-info))
(hcel-text-property-near-point 'internal-id)))
(t (error "%S not supported and not in eldoc doc buffer." major-mode))))
(provide 'hcel-minor)
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