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;;; breadcrumb.el --- imenu-based breadcrumb paths -*- lexical-binding: t; -*-
;; Copyright (C) 2023 João Távora
;; Author: João Távora <joaotavora@gmail.com>
;; Keywords:
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program 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 General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;;; Code:
(require 'cl-lib)
(require 'imenu)
(defun bc-path (index-alist pos)
"Get breadcrumb for position POS given INDEX-ALIST."
(cl-labels ((containsp (node pos)
(let ((reg (get-text-property 0 'breadcrumb-region (car node)))
bare-start)
(cond (reg (<= (car reg) pos (cdr reg)))
((number-or-marker-p (setq bare-start (cdr node)))
(save-excursion
(goto-char bare-start)
(end-of-defun)
(<= bare-start pos (point)))))))
(dfs (node &optional path)
(or (and (consp (cdr node))
(cl-loop with path = (cons (car node) path)
for c in (cdr node)
thereis (dfs c path)))
(and (containsp node pos)
(cons (car node) path)))))
(nreverse
(cl-loop for c in index-alist thereis (dfs c)))))
(defvar bc--last-update-tick 0)
(defvar bc--header-line-key [header-line mouse-1])
(defun bc--format-node (p)
(let ((reg (get-text-property 0 'breadcrumb-region p)))
(if reg
(propertize p
'mouse-face 'header-line-highlight
'help-echo "Go here"
'keymap (let ((m (make-sparse-keymap)))
(define-key m bc--header-line-key
(lambda (&rest _e)
(interactive)
(push-mark)
(goto-char (car reg))))
m))
p)))
(defun bc-path-for-header-line ()
(cl-loop with alist =
(if (and imenu--index-alist
(= (buffer-chars-modified-tick) bc--last-update-tick))
imenu--index-alist
(setq bc--last-update-tick (buffer-chars-modified-tick))
(imenu--make-index-alist))
for (p . more) on (bc-path alist (point))
collect (bc--format-node p) when more collect " > "))
(defvar bc-header-line-format
'(:eval (bc-path-for-header-line)))
(define-minor-mode bc-mode
"Header lines with breadcrumbs."
:init-value nil
(if bc-mode (add-to-list 'header-line-format bc-header-line-format)
(setq header-line-format (delq bc-header-line-format header-line-format))))
(provide 'breadcrumb)
;;; breadcrumb.el ends here
;; Local Variables:
;; read-symbol-shorthands: (("bc-" . "breadcrumb-"))
;; End:
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