You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: conf.rs
    path of file: ./repos/rust-clippy/clippy_config/src
    
    the code of the file until where you have to start completion: use crate::msrvs::Msrv;
use crate::types::{DisallowedPath, MacroMatcher, MatchLintBehaviour, PubUnderscoreFieldsBehaviour, Rename};
use crate::ClippyConfiguration;
use rustc_data_structures::fx::FxHashSet;
use rustc_errors::Applicability;
use rustc_session::Session;
use rustc_span::edit_distance::edit_distance;
use rustc_span::{BytePos, Pos, SourceFile, Span, SyntaxContext};
use serde::de::{IgnoredAny, IntoDeserializer, MapAccess, Visitor};
use serde::{Deserialize, Deserializer, Serialize};
use std::fmt::{Debug, Display, Formatter};
use std::ops::Range;
use std::path::PathBuf;
use std::str::FromStr;
use std::sync::OnceLock;
use std::{cmp, env, fmt, fs, io};

#[rustfmt::skip]
const DEFAULT_DOC_VALID_IDENTS: &[&str] = &[
    "KiB", "MiB", "GiB", "TiB", "PiB", "EiB",
    "DirectX",
    "ECMAScript",
    "GPLv2", "GPLv3",
    "GitHub", "GitLab",

    
fn calculate_dimensions(fields: &[&str]) -> (usize, Vec<usize>) {
    let columns = env::var("CLIPPY_TERMINAL_WIDTH")
        .ok()
        .and_then(|s| <usize as FromStr>::from_str(&s).ok())
        .map_or(1, |terminal_width| {
            let max_field_width = fields.iter().map(|field| field.len()).max().unwrap();
            cmp::max(1, terminal_width / (SEPARATOR_WIDTH + max_field_width))
        });

    let rows = (fields.len() + (columns - 1)) / columns;

    let column_widths = (0..columns)
        .map(|column| {
            if column < columns - 1 {
                (0..rows)
                    .map(|row| {
                        let index = column * rows + row;
                        let field = fields.get(index).copied().unwrap_or_default();
                        field.len()
                    })
                    .max()
                    .unwrap()
            } else {
                // Avoid adding extra space to the last column.
                0
            }
        })
        .collect::<Vec<_>>();

    (rows, column_widths)
}