Function load 

pub fn load(dir: &Path) -> Result<IgnoreList, IgnoreError>

Load and merge .gitignore then .mkitignore from dir. Returns an empty list if neither file is present.

.gitignore patterns come first so a repo’s own .mkitignore wins under last-match-wins.

Errors

• IgnoreError::FileTooLarge if either file exceeds 1 MiB.
• IgnoreError::Io for other filesystem failures.