Links from c Modules to Lua Modules in documentation don't work

[HHHartmann]

See the link on https://nodemcu.readthedocs.io/en/dev/modules/node/#example_7

Expected behavior

point to https://nodemcu.readthedocs.io/en/dev/lua-modules/telnet/

Actual behavior

points to https://github.com/nodemcu/nodemcu-firmware/tree/dev/lua-modules/telnet/ which does not exist

Test code

The link is as follows: ../lua-modules/telnet.md

NOTE:
links like ../../app/modules/node.c work as desired and point to https://github.com/nodemcu/nodemcu-firmware/tree/dev/app/modules/node.c

NodeMCU startup banner

N/A

Hardware

irrelevant

Prior discussion starts here:
#3489 (comment)

@marcelstoer commented 2 days ago
Oh, just realized we have the same issue on the BME280 math page.

Caused by this https://github.com/nodemcu/nodemcu-firmware/blob/release/docs/js/extra.js#L46

@HHHartmann commented 2 days ago
Staring at the code not knowing much about js it might be that adding a "/" to the relativePath might do the job.
I assume that the dots are evaluated as wildcats matching any character. Thus effectively matching the intended start of "../../dev" but also "../lua-modules"

@marcelstoer commented 2 days ago
With the docs a lot of stuff isn't as it may seem - and much of it stems from the requirement of having links work both while browsing GitHub and inside the docs.

• In the original node.md with have See [the telnet lua module](../lua-modules/telnet.md) for... -> relative link 1 level up
• His works when browsing GitHub
• When this is built into the HTML structure by RTD/MkDocs this becomes <p>See <a href="../../lua-modules/telnet/">the telnet lua module</a> for a working -> relative link 2 levels up
  • This is basically fine (MkDocs ensures all relative links are consistent) as we want to go from
    https://nodemcu.readthedocs.io/en/dev/modules/node/index.html#nodeinput
    to
    https://nodemcu.readthedocs.io/en/dev/lua-modules/telnet/index.html
  • It clashes, however, with all links that already have ../../ in the original .md. This is used in links to .c source files for example: [node.c](../../app/modules/node.c). MkDocs realizes those links point beyond the docs structure and keeps them as-is (rather than adding another level).
• Our JavaScript code can't tell the two apart and applies the "fix" to both.

Side note: in JavaScript the pattern in String.prototype.replace() can be a string or a RegExp; we use it with a string.

[HHHartmann]

Actually I thought about the

$("div.section a[href^='" + relativePath + "']")

snippet.
It selects everything that has a "/" in the third position. But reading your explanations it seems to be different.

What about if we only adapt links to ../../dev.
Maybe check if there are other links to the sources or find a negative pattern that matches everything but "modules" and "lua-modules"
But then there are md files in other places too which might get linked.
Maybe apply the tweak only to urls that start with "../.." and do not end with "/", or better have nothing but an ancor (#) after the "/"

[marcelstoer]

I'll take a look later this week I hope.

What about if we only adapt links to ../../dev.

Well, the tweak cannot be branch-dependent.

I was thinking about checking whether the link points to any of the dirs in the /docs folder. Those are the ones that the tweak must not be applied to as anything inside this dir is (correctly) managed by MkDocs.

[HHHartmann]

Well done. Works as expected

[marcelstoer]

Thanks for testing Gregor