docsearch not searching for foo:idx: entries

[timotheecour]

when a doc comment for a symbol (eg ospaths.lastPathPart) refers to a idx entry, eg baseName:idx:

proc lastPathPart*(path: string): string =
  ## like ``extractFilename``, but ignores trailing dir separator; aka: `baseName`:idx: in some other languages.

it (correctly) ends up in an entry in https://nim-lang.github.io/Nim/theindex.html
however, docsearch can't find these idx entries. /cc @rayman22201

Possible Solution

• docsearch should work when searching for an idx entry (eg baseName should retrieve ospaths.lastPathPart)
• theindex.html should show the symbol in which the idx entry was mentioned, eg:

baseName:
Module ospaths

should be like other entries:

baseName:
ospaths: lastPathPart(path: string): string
# or alternatively:
referenced in: ospaths: lastPathPart(path: string): string

• the idx entry baseName should be a link instead of plain text in rendered html

Additional Information

• this was discussed in https://forum.nim-lang.org/t/4331 does RST foo:idx: actually work?
• also 37986d0#commitcomment-30927593

[rayman22201]

I think this is another issue that theindex.json will fix.
A lot of data has to be left out because the search code can't differentiate the data in html format.