fix!: Replace atty with is_terminal

.clippy.toml

@@ -0,0 +1 @@
+msrv = "1.60.0"  # MSRV

.github/workflows/ci.yml

@@ -55,15 +55,15 @@ jobs:
     - name: Run crate example
       run: cargo run --example default
   msrv:
-    name: "Check MSRV: 1.41.0"
+    name: "Check MSRV: 1.60.0"
     runs-on: ubuntu-latest
     steps:
     - name: Checkout repository
       uses: actions/checkout@v3
     - name: Install Rust
       uses: actions-rs/toolchain@v1
       with:
-        toolchain: 1.41.0  # MSRV
+        toolchain: 1.60.0  # MSRV
         profile: minimal
         override: true
     - uses: Swatinem/rust-cache@v1
@@ -119,7 +119,7 @@ jobs:
     - name: Install Rust
       uses: actions-rs/toolchain@v1
       with:
-        toolchain: 1.41.0  # MSRV
+        toolchain: 1.60.0  # MSRV
         profile: minimal
         override: true
         components: clippy

Cargo.toml

@@ -14,8 +14,8 @@ license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-cli/env_logger/"
 categories = ["development-tools::debugging"]
 keywords = ["logging", "log", "logger"]
-edition = "2018"
-rust-version = "1.41.0"  # MSRV
+edition = "2021"
+rust-version = "1.60.0"  # MSRV
 include = [
   "build.rs",
   "src/**/*",
@@ -37,14 +37,18 @@ pre-release-replacements = [
 ]
 
 [features]
-default = ["termcolor", "atty", "humantime", "regex"]
+default = ["auto-color", "humantime", "regex"]
+color = ["dep:termcolor"]
+auto-color = ["dep:is-terminal", "color"]
+humantime = ["dep:humantime"]
+regex = ["dep:regex"]
 
 [dependencies]
 log = { version = "0.4.8", features = ["std"] }
 regex = { version = "1.0.3", optional = true, default-features=false, features=["std", "perf"] }
 termcolor = { version = "1.1.1", optional = true }
 humantime = { version = "2.0.0", optional = true }
-atty = { version = "0.2.5", optional = true }
+is-terminal = { version = "0.4.0", optional = true }
 
 [[test]]
 name = "regexp_filter"

ci/src/main.rs

@@ -2,7 +2,7 @@ mod permute;
 mod task;
 
 fn main() {
-    let features = ["termcolor", "humantime", "atty", "regex"];
+    let features = ["color", "humantime", "auto-color", "regex"];
 
     // Run a default build
     if !task::test(Default::default()) {

ci/src/task.rs

@@ -58,7 +58,7 @@ pub fn test(args: TestArgs) -> bool {
     }
 
     if let Some(features) = &features {
-        command.args(&["--features", features]);
+        command.args(["--features", features]);
     }
 
     println!("running {:?}", command);

examples/custom_format.rs

@@ -17,7 +17,7 @@ $ export MY_LOG_STYLE=never
 If you want to control the logging output completely, see the `custom_logger` example.
 */
 
-#[cfg(all(feature = "termcolor", feature = "humantime"))]
+#[cfg(all(feature = "color", feature = "humantime"))]
 fn main() {
     use env_logger::{fmt::Color, Builder, Env};
 
@@ -50,5 +50,5 @@ fn main() {
     log::info!("a log from `MyLogger`");
 }
 
-#[cfg(not(all(feature = "termcolor", feature = "humantime")))]
+#[cfg(not(all(feature = "color", feature = "humantime")))]
 fn main() {}

src/fmt/mod.rs

@@ -202,9 +202,9 @@ impl Builder {
     }
 }
 
-#[cfg(feature = "termcolor")]
+#[cfg(feature = "color")]
 type SubtleStyle = StyledValue<'static, &'static str>;
-#[cfg(not(feature = "termcolor"))]
+#[cfg(not(feature = "color"))]
 type SubtleStyle = &'static str;
 
 /// The default format.
@@ -233,7 +233,7 @@ impl<'a> DefaultFormat<'a> {
     }
 
     fn subtle_style(&self, text: &'static str) -> SubtleStyle {
-        #[cfg(feature = "termcolor")]
+        #[cfg(feature = "color")]
         {
             self.buf
                 .style()
@@ -242,7 +242,7 @@ impl<'a> DefaultFormat<'a> {
                 .clone()
                 .into_value(text)
         }
-        #[cfg(not(feature = "termcolor"))]
+        #[cfg(not(feature = "color"))]
         {
             text
         }
@@ -268,11 +268,11 @@ impl<'a> DefaultFormat<'a> {
         }
 
         let level = {
-            #[cfg(feature = "termcolor")]
+            #[cfg(feature = "color")]
             {
                 self.buf.default_styled_level(record.level())
             }
-            #[cfg(not(feature = "termcolor"))]
+            #[cfg(not(feature = "color"))]
             {
                 record.level()
             }

src/fmt/writer/atty.rs

@@ -1,24 +1,25 @@
 /*
 This internal module contains the terminal detection implementation.
 
-If the `atty` crate is available then we use it to detect whether we're
-attached to a particular TTY. If the `atty` crate is not available we
-assume we're not attached to anything. This effectively prevents styles
-from being printed.
+If the `auto-color` feature is enabled then we detect whether we're attached to a particular TTY.
+Otherwise, assume we're not attached to anything. This effectively prevents styles from being
+printed.
 */
 
-#[cfg(feature = "atty")]
+#[cfg(feature = "auto-color")]
 mod imp {
+    use is_terminal::IsTerminal;
+
     pub(in crate::fmt) fn is_stdout() -> bool {
-        atty::is(atty::Stream::Stdout)
+        std::io::stdout().is_terminal()
     }
 
     pub(in crate::fmt) fn is_stderr() -> bool {
-        atty::is(atty::Stream::Stderr)
+        std::io::stderr().is_terminal()
     }
 }
 
-#[cfg(not(feature = "atty"))]
+#[cfg(not(feature = "auto-color"))]
 mod imp {
     pub(in crate::fmt) fn is_stdout() -> bool {
         false

src/fmt/writer/mod.rs

@@ -165,6 +165,7 @@ impl Builder {
     }
 
     /// Whether or not to capture logs for `cargo test`.
+    #[allow(clippy::wrong_self_convention)]
     pub(crate) fn is_test(&mut self, is_test: bool) -> &mut Self {
         self.is_test = is_test;
         self

src/fmt/writer/termcolor/mod.rs

@@ -5,8 +5,8 @@ Its public API is available when the `termcolor` crate is available.
 The terminal printing is shimmed when the `termcolor` crate is not available.
 */
 
-#[cfg_attr(feature = "termcolor", path = "extern_impl.rs")]
-#[cfg_attr(not(feature = "termcolor"), path = "shim_impl.rs")]
+#[cfg_attr(feature = "color", path = "extern_impl.rs")]
+#[cfg_attr(not(feature = "color"), path = "shim_impl.rs")]
 mod imp;
 
 pub(in crate::fmt) use self::imp::*;

src/lib.rs

@@ -1168,7 +1168,7 @@ pub fn init() {
 /// ```
 /// use env_logger::{Builder, Env};
 ///
-/// # fn run() -> Result<(), Box<::std::error::Error>> {
+/// # fn run() -> Result<(), Box<dyn ::std::error::Error>> {
 /// let env = Env::new().filter("MY_LOG").write_style("MY_LOG_STYLE");
 ///
 /// env_logger::try_init_from_env(env)?;