1 files changed, 42 insertions, 0 deletions
diff --git a/vendor/supports-unicode/src/lib.rs b/vendor/supports-unicode/src/lib.rs
new file mode 100644
index 0000000..b47b39b
--- /dev/null
+++ b/vendor/supports-unicode/src/lib.rs
@@ -0,0 +1,42 @@
+#![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")
+    }
+}