`-o` option for `buildIndex` is not respected

[binhonglee]

No matter what I put in the -o option when running buildIndex, it will always output the file as theindex.html in the folder buildIndex is trying to index.

Example

nim buildIndex -o:docs/index.html docs

Current Output

Creates the file docs/theindex.html

Expected Output

Creates the file docs/index.html

Possible Solution

Respects the -o option and create the appropriate output file instead.

Additional Information

$ nim -v
Nim Compiler Version 1.0.0 [Linux: amd64]
Compiled at 2019-09-23
Copyright (c) 2006-2019 by Andreas Rumpf

git hash: f7a8fc46c0012033917582eb740dc0343c093e35
active boot switches: -d:release

I'm running this on WSL Ubuntu.

[binhonglee]

This has been fixed with #13037.