Function process_file_includes 

pub fn process_file_includes(markdown: &str, base_dir: &Path) -> String

Process file includes in Nixpkgs/NixOS documentation.

This function processes file include syntax:

```{=include=}
path/to/file1.md
path/to/file2.md
```

Arguments

• markdown - The input markdown text
• base_dir - The base directory for resolving relative file paths

Returns

The processed markdown text with included files expanded

Safety

Only relative paths without “..” are allowed for security.