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;;; racket-imenu.el -*- lexical-binding: t; -*-
;; Copyright (c) 2013-2021 by Greg Hendershott.
;; Portions Copyright (C) 1985-1986, 1999-2013 Free Software Foundation, Inc.
;; Author: Greg Hendershott
;; URL: https://github.com/greghendershott/racket-mode
;; License:
;; This 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 2, or (at your option)
;; any later version. This 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. See
;; http://www.gnu.org/licenses/ for details.
(require 'cl-lib)
(require 'imenu)
(defun racket-imenu-create-index-function ()
"A function for the variable `imenu-create-index-function'."
(save-excursion
(goto-char (point-min))
(racket--imenu-goto-start-of-current-sexp)
(racket--imenu-walk)))
(defun racket--imenu-walk ()
"With point at the start of a sexp, walk all the sepxs.
Note that `racket--imenu-item' will walk into Racket module forms
and call us recursively."
(cl-loop append (racket--imenu-item) into xs
while (racket--imenu-goto-start-of-following-sexp)
finally return xs))
(defun racket--imenu-item ()
"Return the identifier for the sexp at point if any, else nil.
If sexp at point is a Racket module form create a submenu."
(cond ((looking-at (rx "(define" (* (or (syntax word)
(syntax symbol)
(syntax punctuation)))
(+ (syntax whitespace))
(* ?\()
(group (+ (or (syntax word)
(syntax symbol)
(syntax punctuation))))))
(list (cons (match-string-no-properties 1)
(if imenu-use-markers
(copy-marker (match-beginning 1))
(match-beginning 1)))))
((looking-at (rx "(module" (? (any ?+ ?*))
(+ (syntax whitespace))
(group (+ (or (syntax word)
(syntax symbol)
(syntax punctuation))))))
(save-excursion
(goto-char (match-end 1))
(racket--imenu-goto-start-of-current-sexp)
(list (cons (concat "Module: " (match-string-no-properties 1))
(racket--imenu-walk )))))
(t nil)))
(defun racket--imenu-goto-start-of-current-sexp ()
(ignore-errors
(forward-sexp 1)
(forward-sexp -1)))
(defun racket--imenu-goto-start-of-following-sexp ()
(condition-case nil
(progn
(forward-sexp 1)
(let ((orig (point)))
(forward-sexp 1)
(if (or (eobp) (equal orig (point)))
nil
(forward-sexp -1)
t)))
(scan-error nil)))
(provide 'racket-imenu)
;;; racket-imenu.el ends here
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