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#![doc = include_str!("../README.md")]
/// possible stream sources
#[derive(Clone, Copy, Debug)]
pub enum Stream {
Stdout,
Stderr,
}
fn is_a_tty(stream: Stream) -> bool {
use is_terminal::*;
match stream {
Stream::Stdout => std::io::stdout().is_terminal(),
Stream::Stderr => std::io::stderr().is_terminal(),
}
}
pub fn on(stream: Stream) -> bool {
if !is_a_tty(stream) {
// If we're just piping out, it's fine to spit out unicode! :)
true
} else if std::env::consts::OS == "windows" {
// Just a handful of things!
std::env::var("CI").is_ok()
|| std::env::var("WT_SESSION").is_ok() // Windows Terminal
|| std::env::var("ConEmuTask") == Ok("{cmd:Cmder}".into()) // ConEmu and cmder
|| std::env::var("TERM_PROGRAM") == Ok("vscode".into())
|| std::env::var("TERM") == Ok("xterm-256color".into())
|| std::env::var("TERM") == Ok("alacritty".into())
} else if std::env::var("TERM") == Ok("linux".into()) {
// Linux kernel console. Maybe redundant with the below?...
false
} else {
// From https://github.com/iarna/has-unicode/blob/master/index.js
let ctype = std::env::var("LC_ALL")
.or_else(|_| std::env::var("LC_CTYPE"))
.or_else(|_| std::env::var("LANG"))
.unwrap_or_else(|_| "".into())
.to_uppercase();
ctype.ends_with("UTF8") || ctype.ends_with("UTF-8")
}
}
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