pip install extracttoc

usage: extracttoc [-h] [-s] [-c] [-i] [-l LIMIT] file

Extracts the table of contents from a markdown file.

positional arguments:
  file                  Provide a markdown file from which to extract the toc.

optional arguments:
  -h, --help            show this help message and exit
  -s, --save            Write the TOC to a md file. File name will be: {input-file-name}-toc.md
  -c, --copy            Copy the TOC to your clipboard
  -i, --insert          Insert the TOC directly into the file in front of the first line.
  -l LIMIT, --levels LIMIT
                        Set the number of levels which will be included in the TOC.