refactoring sidebar highlighting and allowing collapsed subsections

[choldgraf]

This moves the logic for sidebar highlighting outside of the HTML template, and into a bit of javascript. The main goal is to make it more maintainable and understandable, and also to make it possible for sub-sections to be collapsed if wished

@drbeane do you wanna give this branch a shot and see if that gets your sub-section collapsing properly?

closes #407

[drbeane]

Sorry for the slow reply on this. I finally got a chance to test it out today, and it seems to be working splendidly. Thank you very much @choldgraf!!

[choldgraf]

Sounds good - the failing test is for the CircleCI build because Ruby is having a hard time installing one of the dependencies. I'm not sure why that is, but all the other tests are passing, so I'm gonna merge this one

[Jace-Yang]

Is it a way to turn collapsable sidebar off for some file?
I am working on a python JB. For some chapter, like regex cheatsheet, showing everything in the sidebar TOC allows reader quickly navigating into the sub-chapter. But I couldn't find the parameter to set this after searching a while...😭

[choldgraf]

What is it you wish to do exactly? You want to make the button to close the sidebar be invisible on some pages? Why do you not want readers to be able to close the sidebar?

[Jace-Yang]

What is it you wish to do exactly? You want to make the button to close the sidebar be invisible on some pages? Why do you not want readers to be able to close the sidebar?

It doesn't necessary has to be a button for reader. I wish the writer can set whether a page will collapse the sub-sections within a non-active section in the sidebar (not the entire sidebar).

• For some pages, my readers would prefer to only see the sections until they click on a specific section
• For some pages, in fact most parts of my book, readers would prefer to see the entire sidebar TOC no matter what specific section they are in.

BTW, I opened a new issue for this: #1792

[Jace-Yang]

What is it you wish to do exactly? You want to make the button to close the sidebar be invisible on some pages? Why do you not want readers to be able to close the sidebar?

It doesn't necessary has to be a button for reader. I wish the writer can set whether a page will collapse the sub-sections within a non-active section in the sidebar (not the entire sidebar).

• For some pages, my readers would prefer to only see the sections until they click on a specific section
• For some pages, in fact most parts of my book, readers would prefer to see the entire sidebar TOC no matter what specific section they are in.

BTW, I opened a new issue for this: #1792

Any updates? Much appreciate it.