Wrong type argument: consp, nil

[rotdrop]

Hello,

Please, provide the following information and remove the useless parts.
Thanks in advance.

bug -> yes, I suppose

M-x markdown-toc-bug-report

markdown-toc - Please:
- Describe your problem with clarity and conciceness (cf. https://www.gnu.org/software/emacs/manual/html_node/emacs/Understanding-Bug-Reporting.html)
- Explicit your installation choice (melpa, marmalade, el-get, tarball, git clone...).
- Report the following message trace inside your issue.

System information:
- system-type: gnu/linux
- locale-coding-system: utf-8-unix
- emacs-version: GNU Emacs 28.0.60 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.29, cairo version 1.16.0)
 of 2021-11-30
- markdown-mode path: /home/claus/.emacs.d/elpa/markdown-mode-20211022.55/markdown-mode.el
- markdown-toc version: 0.1.5
- markdown-toc path: /home/claus/.emacs.d/elpa/markdown-toc-20210905.738/markdown-toc.el

Expected behavior

What command did you use and what were you expecting?

markdown-toc-generate-toc, markdown-toc-refresh-toc, markdown-toc-generate-or-refresh-toc

Actual behavior

When running the command markdown-toc-generate-toc I get the error Wrong type argument: consp, nil with the following test-file:

PROJECT
========

# Heading #

## Sub-Heading ##

Blah blah.

# Another Heading #

Blah blah.

When I remove the second-level heading the toc is generated successfully.

PROJECT
========

# Heading #

Blah blah.

# Another Heading #

Blah blah.

Steps to reproduce the behavior

How can we try and reproduce?

See above, simple example mark-down code.

Thanks for sharing!

Cheers,

[rafauke]

@rotdrop I had the same issue. Please try playing with markdown-nested-imenu-heading-index variable. In my case, explicitly setting it to t has fixed the issue for me

[rafauke]

Looks like I have a regression and the issue is back. If you need my help for debugging @sochotnicky, I would be happy to help :)

[louisdecharson]

Hello @rafauke, @rotdrop
I have the same issue, have you found a solution ?

[psibi]

The PR here fixes it for me: jrblevin/markdown-mode#721

Can you give it a try to see if it fixes for you too ?

[rotdrop]

The PR here fixes it for me: jrblevin/markdown-mode#721

Can you give it a try to see if it fixes for you too ?

Difficult to tell. The bug was still there as of today. Then I manually applied your changes and the bug went away. But I had also removed the eln-cache in between. Now I have removed the eln-cache again and restored the original markdown-mode.el and the bug is -- still not there. So I do not known whether this is a crazy interaction with the native compilation mode.

[webdevelopers-eu]

I get the same bug with latest GIT and ELPA version as well.

# Test
## Features
### Javascript
## Syntax

If I have a simple file like this it fails to generate TOC.

toggle-debug-on-error shows this:

Debugger entered--Lisp error: (wrong-type-argument consp nil)
  markdown-imenu-create-nested-index()
  funcall(markdown-imenu-create-nested-index)
  (markdown-toc--compute-toc-structure (funcall imenu-create-index-function))
  (funcall markdown-toc-user-toc-structure-manipulation-fn (markdown-toc--compute-toc-structure (funcall imenu-create-index-function)))
  (markdown-toc--generate-toc (funcall markdown-toc-user-toc-structure-manipulation-fn (markdown-toc--compute-toc-structure (funcall imenu-create-index-function))))
  (insert (markdown-toc--generate-toc (funcall markdown-toc-user-toc-structure-manipulation-fn (markdown-toc--compute-toc-structure (funcall imenu-create-index-function)))))
  (save-excursion (if (markdown-toc--toc-already-present-p) (progn (markdown-toc--delete-toc t))) (insert (markdown-toc--generate-toc (funcall markdown-toc-user-toc-structure-manipulation-fn (markdown-toc--compute-toc-structure (funcall imenu-create-index-function))))))
  markdown-toc-generate-toc(t)
  markdown-toc-generate-or-refresh-toc()
  funcall-interactively(markdown-toc-generate-or-refresh-toc)
  command-execute(markdown-toc-generate-or-refresh-toc record)
  execute-extended-command(nil "markdown-toc-generate-or-refresh-toc" nil)
  funcall-interactively(execute-extended-command nil "markdown-toc-generate-or-refresh-toc" nil)
  command-execute(execute-extended-command)

GNU Emacs 28.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.24, cairo version 1.16.0) of 2023-01-30, modified by Debian

This fixed it for me: jrblevin/markdown-mode#578 (comment)

Not sure if my post is any helpful since I don't know lisp. If it is something already known, ignore it.