@spec expand(JustBash.t(), String.t()) :: [String.t()]

Expand a glob pattern against the filesystem. Returns a list of matching filenames, or the original pattern if no matches.

Handles wildcards in any path segment, not just the filename. For example: /tmp//file.txt or /a//b/*.log

Trailing slashes are preserved: /tmp/*/ expands to /tmp/foo/, /tmp/bar/

@spec glob_pattern_to_regex(String.t()) :: String.t()

Convert a glob pattern to a regex pattern string.

@spec has_glob_chars?(String.t()) :: boolean()

Check if a string contains glob metacharacters.

@spec split_on_ifs(String.t(), String.t()) :: [String.t()]

Split a string on IFS characters.