Use a 'stderr' feature to target log output to stderr

borntyping · Aug 7, 2021 · 9957dc5 · 9957dc5
1 parent 3dd34b0
commit 9957dc5
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diff --git a/Cargo.toml b/Cargo.toml
@@ -11,6 +11,7 @@ edition = "2018"
 default = ["colored", "chrono"]
 colors = ["colored"]
 timestamps = ["chrono"]
+stderr = []
 
 [dependencies]
 log = { version = "^0.4.5", features = ["std"] }

diff --git a/src/lib.rs b/src/lib.rs
@@ -305,17 +305,29 @@ impl Log for SimpleLogger {
 
             #[cfg(feature = "chrono")]
             if self.timestamps {
+                #[cfg(not(feature = "stderr"))]
                 println!(
                     "{} {:<5} [{}] {}",
                     Local::now().format("%Y-%m-%d %H:%M:%S,%3f"),
                     level_string,
                     target,
                     record.args()
                 );
+                #[cfg(feature = "stderr")]
+                eprintln!(
+                    "{} {:<5} [{}] {}",
+                    Local::now().format("%Y-%m-%d %H:%M:%S,%3f"),
+                    level_string,
+                    target,
+                    record.args()
+                );
                 return;
             }
 
+            #[cfg(not(feature = "stderr"))]
             println!("{:<5} [{}] {}", level_string, target, record.args());
+            #[cfg(feature = "stderr")]
+            eprintln!("{:<5} [{}] {}", level_string, target, record.args());
         }
     }