LoadPackageIgnoreRules implements reasonable default behavior for finding ignore rules for a particular package root directory: if .terraformignore is present then use it, or otherwise just return DefaultRuleset.

ParseIgnoreFileContent takes a reader over the content of a .terraformignore file and returns the Ruleset described by that file, or an error if the file is invalid.

ExcludesResult is the result of matching a path against a Ruleset.

A Ruleset is the result of reading, parsing, and compiling a ".terraformignore" file.