ansi_term: library for controlling colours and formatting
atty: are you or are you not a tty?
base64: Base64 encode/decode
cc: A library to compile C/C++/assembly into a Rust library/application.
clap: Command Line Argument Parser
dirs: Abstraction of platform-specific standard directories
humantime: Humanized time parsing/formatting
regex: library for parsing, compiling, and executing regular expressions
unicode-width: Calculate displayed width of char/str types according to Unicode Standard.
xattr: unix extended filesystem attributes