replace atty crate with std's isTerminal

Author: klensy

Cargo.lock

@@ -3732,7 +3732,6 @@ dependencies = [
 name = "rustc_interface"
 version = "0.0.0"
 dependencies = [
- "atty",
  "libloading",
  "rustc-rayon",
  "rustc-rayon-core",
@@ -4196,7 +4195,6 @@ dependencies = [
 name = "rustc_session"
 version = "0.0.0"
 dependencies = [
- "atty",
  "bitflags 1.3.2",
  "getopts",
  "libc",

compiler/rustc_interface/Cargo.toml

@@ -6,7 +6,6 @@ edition = "2021"
 [lib]
 
 [dependencies]
-atty = "0.2.13"
 libloading = "0.7.1"
 tracing = "0.1"
 rustc-rayon-core = { version = "0.5.0", optional = true }

compiler/rustc_interface/src/util.rs

@@ -519,7 +519,8 @@ fn multiple_output_types_to_stdout(
     output_types: &OutputTypes,
     single_output_file_is_stdout: bool,
 ) -> bool {
-    if atty::is(atty::Stream::Stdout) {
+    use std::io::IsTerminal;
+    if std::io::stdout().is_terminal() {
         // If stdout is a tty, check if multiple text output types are
         // specified by `--emit foo=- --emit bar=-` or `-o - --emit foo,bar`
         let named_text_types = output_types

compiler/rustc_session/Cargo.toml

@@ -4,7 +4,6 @@ version = "0.0.0"
 edition = "2021"
 
 [dependencies]
-atty = "0.2.13"
 bitflags = "1.2.1"
 getopts = "0.2"
 rustc_macros = { path = "../rustc_macros" }

compiler/rustc_session/src/config.rs

@@ -834,9 +834,10 @@ impl OutFileName {
     }
 
     pub fn is_tty(&self) -> bool {
+        use std::io::IsTerminal;
         match *self {
             OutFileName::Real(_) => false,
-            OutFileName::Stdout => atty::is(atty::Stream::Stdout),
+            OutFileName::Stdout => std::io::stdout().is_terminal(),
         }
     }