fix: add missing imports and remove unused ones

src/main.rs

@@ -2,7 +2,6 @@ use nix::fcntl::FdFlag;
 use nix::unistd::{close, pipe};
 use nix::Error as NixError;
 use std::collections::HashMap;
-use std::io;
 use std::os::fd::FromRawFd;
 use std::path::PathBuf;
 use std::process::Stdio; // For Stdio::null, Stdio::piped
@@ -10,7 +9,6 @@ use std::process::Stdio; // For Stdio::null, Stdio::piped
 use anyhow::{anyhow, Context, Error, Result};
 use clap::error::ErrorKind;
 use clap::*;
-use gethostname::gethostname;
 use log::*;
 use rusqlite::Connection;
 mod modes;
@@ -27,6 +25,7 @@ use prettytable::format::{Alignment, TableFormat};
 use prettytable::row;
 use prettytable::{Attr, Cell, Row, Table};
 
+use std::str::FromStr;
 use chrono::prelude::*;
 
 #[macro_use]
@@ -215,6 +214,7 @@ pub enum ColumnType {
 }
 
 fn main() -> Result<(), Error> {
+    use std::fs;
     let proj_dirs = ProjectDirs::from("gt0.ca", "Andrew Phillips", "Keep");
 
     let mut cmd = Args::command();
@@ -444,6 +444,7 @@ fn mode_diff(
         std::thread::spawn(move || {
             // Original code used .expect/.unwrap, implying panics on error.
             // This matches that style. For more robust error handling, return Result from thread.
+            use std::io::BufWriter;
             let mut buffered_pipe_writer_a = BufWriter::new(pipe_writer_a_raw);
             let engine_a = compression::get_engine(compression_type_a_clone)
                 .expect("Unable to get compression engine for Item A");