Function show_session 

pub fn show_session(
    session: &Session,
    grep: Option<&str>,
    json: bool,
    output: &Output,
) -> Result<()>

Display session details with optional grep filtering and JSON output.

Normal mode

Prints session header info (name, ID, date, shell, OS, hostname, etc.) followed by a numbered command list. If grep is provided, only commands matching the regex pattern are shown.

JSON mode

Serializes the entire session to pretty-printed JSON.

Errors

Returns an error if the grep pattern is an invalid regex.