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use atty::Stream;
use std::fmt;
#[cfg(not(target_os = "macos"))]
lazy_static::lazy_static! {
static ref IS_LANG_UTF8: bool = {
match std::env::var("LANG") {
Ok(lang) => lang.to_uppercase().ends_with("UTF-8"),
_ => false,
}
};
}
pub struct Emoji<'a, 'b>(pub &'a str, pub &'b str);
impl<'a, 'b> Emoji<'a, 'b> {
pub const fn new(emoji: &'a str, fallback: &'b str) -> Self {
Self(emoji, fallback)
}
}
impl fmt::Display for Emoji<'_, '_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
if should_display_emoji() {
write!(f, "{}", self.0)
} else {
write!(f, "{}", self.1)
}
}
}
fn should_display_emoji() -> bool {
atty::is(Stream::Stdout) && is_emoji_supported()
}
#[cfg(windows)]
fn is_emoji_supported() -> bool {
std::env::var("WT_SESSION").is_some()
}
#[cfg(target_os = "macos")]
fn is_emoji_supported() -> bool {
true
}
#[cfg(not(target_os = "macos"))]
fn is_emoji_supported() -> bool {
*IS_LANG_UTF8
}