Function open 

pub fn open<'a, I: Display>(
    prompt: &'a str,
    items: &'a [I],
) -> Result<Option<&'a I>>

Prompt the user to select an item from a numbered list.

Displays prompt followed by numbered items via the Vimscript inputlist() function and returns the chosen element (1-based user index translated to 0-based). Returns None if the user cancels.

Errors

• Invoking inputlist() fails.
• The returned index cannot be converted to usize (negative or overflow).