Chapter links are compiled incorrectly if the course has a subdirectory above the module directories

[markkuriekkinen]

Course directory structure:

mycourse/
|-- _content
   |-- module01
   |-- module02

Usually, the module directories are directly in the root of the course repository.

Links from chapter to another chapter are broken in the above course structure.

• This regular expression does not match the chapter file path:

  a-plus-rst-tools/lib/html_tools.py

  Line 128 in 5354ba6

  if q2 and q2.search(val_path_from_root):

• The regex is defined here:

  a-plus-rst-tools/lib/html_tools.py

  Line 72 in 5354ba6

  q2 = re.compile(r'^(' + '|'.join(chapter_dirs) + r')(/|\\)') # Starts with a module directory name.

• The regex requires that the module directory is right under the course root (note the ^).
• In addition, the regex uses incorrect module directory names. The names contain the parent directory too in the form _content_module01. That does not match real file paths.