Implemented -o opt for complete/compgen builtins

Completion candidates now come with a space by default, unless it's a directory

src/libsh/error.rs

@@ -1,9 +1,7 @@
 use std::fmt::Display;
 
 use crate::{
-  libsh::term::{Style, Styled},
-  parse::lex::Span,
-  prelude::*,
+  getopt::Opt, libsh::term::{Style, Styled}, parse::lex::Span, prelude::*
 };
 
 pub type ShResult<T> = Result<T, ShErr>;
@@ -395,6 +393,7 @@ impl From<Errno> for ShErr {
 #[derive(Debug, Clone)]
 pub enum ShErrKind {
   IoErr(io::ErrorKind),
+	InvalidOpt,
   SyntaxErr,
   ParseErr,
   InternalErr,
@@ -421,6 +420,7 @@ impl Display for ShErrKind {
   fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
     let output = match self {
       Self::IoErr(e) => &format!("I/O Error: {e}"),
+			Self::InvalidOpt => &format!("Invalid option"),
       Self::SyntaxErr => "Syntax Error",
       Self::ParseErr => "Parse Error",
       Self::InternalErr => "Internal Error",