Module completion 

Tab completion: context parsing (command vs path), command and path candidates. Rustyline Helper (Completer, Hinter, Highlighter, Validator) for command and path completion.

Structs

CompletionContext

从 (line, pos) 解析出的补全上下文：当前词的前缀，以及是命令还是路径

DevShellHelper

Helper for rustyline: command and path tab-completion using shared Vfs.

NoHint

Dummy hint type for Hinter; we never return a hint (hint() returns None).

Enums

CompletionKind

当前输入位置是命令名、路径，或不需要补全（用于选择补全源）

Functions

complete_commands

Command completion: case-insensitive prefix match. Returns matching command names.

complete_path

Path completion: prefix may contain slashes; only the basename segment is matched.

completion_context

Parse completion context at (line, pos). Returns None if line empty or pos out of bounds.