Remove unmaintained dependency atty in favor of stdlib

Cargo.toml

@@ -12,7 +12,6 @@ documentation = "https://rustwasm.github.io/wasm-pack/"
 
 [dependencies]
 anyhow = "1.0.68"
-atty = "0.2.14"
 binary-install = "0.4.1"
 cargo_metadata = "0.15.2"
 chrono = "0.4.23"

src/installer.rs

@@ -19,11 +19,11 @@
 use std::env;
 use std::fs;
 use std::io;
+use std::io::IsTerminal;
 use std::path::Path;
 use std::process;
 
 use anyhow::{anyhow, bail, Context, Result};
-use atty;
 use which;
 
 pub fn install() -> ! {
@@ -91,9 +91,11 @@ fn confirm_can_overwrite(dst: &Path) -> Result<()> {
         return Ok(());
     }
 
+    let stdin = io::stdin();
+
     // If we're not attached to a TTY then we can't get user input, so there's
     // nothing to do except inform the user about the `-f` flag.
-    if !atty::is(atty::Stream::Stdin) {
+    if !stdin.is_terminal() {
         bail!(
             "existing wasm-pack installation found at `{}`, pass `-f` to \
              force installation over this file, otherwise aborting \
@@ -110,7 +112,7 @@ fn confirm_can_overwrite(dst: &Path) -> Result<()> {
     );
     eprint!("info: would you like to overwrite this file? [y/N]: ");
     let mut line = String::new();
-    io::stdin()
+    stdin
         .read_line(&mut line)
         .context("failed to read stdin")?;