Function collect_input_from_reader 

pub fn collect_input_from_reader<R: Read>(
    stdin_flag: Option<&str>,
    cli_kwargs: HashMap<String, Value>,
    large_input: bool,
    reader: R,
) -> Result<HashMap<String, Value>, CliError>

Inner implementation: accepts any Read source for testability.

Arguments

• stdin_flag — Some("-") to read from reader, anything else skips STDIN
• cli_kwargs — map of flag name → value (Null values are dropped)
• large_input — if false, reject payloads exceeding STDIN_SIZE_LIMIT_BYTES
• reader — byte source to read from when stdin_flag == Some("-")

Errors

Returns CliError on oversized input, invalid JSON, or non-object JSON.