use ansi_term::{Color, Style}; use std::env; use std::process::Command; use super::{Context, Module}; /// Creates a module with the current user's username /// /// Will display the username if any of the following criteria are met: /// - The current user isn't the same as the one that is logged in (`$LOGNAME` != `$USER`) /// - The current user is root (UID = 0) /// - The user is currently connected as an SSH session (`$SSH_CONNECTION`) pub fn module<'a>(context: &'a Context) -> Option> { let user = env::var("USER").ok(); let logname = env::var("LOGNAME").ok(); let ssh_connection = env::var("SSH_CONNECTION").ok(); let mut module_color = Color::Yellow.bold(); if user != logname || ssh_connection.is_some() || is_root(&mut module_color) { let mut module = context.new_module("username")?; module.set_style(module_color); module.new_segment("username", &user?); return Some(module); } None } fn get_uid() -> Option { match Command::new("id").arg("-u").output() { Ok(output) => String::from_utf8(output.stdout) .map(|uid| uid.trim().parse::().ok()) .ok()?, Err(_) => None, } } fn is_root(style: &mut Style) -> bool { match get_uid() { Some(uid) if uid == 0 => { style.clone_from(&Color::Red.bold()); true } _ => false, } }