build: move from atty → is-terminal

Partially resolves this [RustSec
advisory](https://rustsec.org/advisories/RUSTSEC-2021-0145.html).

Author: ErichDonGubler

Cargo.lock

@@ -16,8 +16,8 @@ clap = { version = "3.0", features = ["derive"] }
 clap_complete = "3.0"
 
 [dependencies]
-atty = "~0.2.11"
 clap = { version = "3.0", features = ["derive"] }
+is-terminal = "0.4.9"
 num_cpus = "1"
 rayon = "~1.4.0"
 regex = "1"

Cargo.toml

@@ -1,10 +1,10 @@
-use atty;
 use clap::Parser;
 use rayon;
 use regex::Regex;
 use termcolor::StandardStream;
 
 use std::default::Default;
+use std::io::{stderr, stdout};
 use std::path::PathBuf;
 use std::process::{Command, Output};
 use std::sync::mpsc::channel;
@@ -88,8 +88,8 @@ fn main() {
     // manually drop tx so the receiver ends
     drop(tx);
 
-    let stdout = StandardStream::stdout(output::color_choice(&cli.color, &atty::Stream::Stdout));
-    let stderr = StandardStream::stderr(output::color_choice(&cli.color, &atty::Stream::Stderr));
+    let stdout = StandardStream::stdout(output::color_choice(&cli.color, &stdout()));
+    let stderr = StandardStream::stderr(output::color_choice(&cli.color, &stderr()));
     {
         let mut stdout_l = stdout.lock();
         let mut stderr_l = stderr.lock();

src/main.rs

@@ -1,13 +1,13 @@
-use atty;
+use is_terminal::IsTerminal;
 use termcolor::{Color, ColorChoice, ColorSpec, WriteColor};
 
 use std::io::{self, Write};
 
 use crate::cli::ColorMode;
 use crate::GitResult;
 
-pub fn color_choice(color_mode: &ColorMode, stream: &atty::Stream) -> ColorChoice {
-    match (color_mode, atty::is(*stream)) {
+pub fn color_choice(color_mode: &ColorMode, stream: &dyn IsTerminal) -> ColorChoice {
+    match (color_mode, stream.is_terminal()) {
         (ColorMode::Always, _) => ColorChoice::Always,
         (ColorMode::Auto, true) => ColorChoice::Auto,
         (ColorMode::Auto, false) => ColorChoice::Never,