refactor: opt out colored

Cargo.toml

@@ -26,12 +26,16 @@ repository = "https://github.com/tisonkun/logforth"
 readme = "README.md"
 
 [features]
-#colored = ["dep:colored"]
+colored = ["dep:colored"]
 
 [dependencies]
 anyhow = { version = "1.0" }
-#colored = { version = "2.1", optional = true }
-colored = { version = "2.1" }
+colored = { version = "2.1", optional = true }
 humantime = { version = "2.1" }
 log = { version = "0.4", features = ["std", "kv_unstable"] }
 paste = { version = "1.0" }
+
+[[example]]
+name = "simple_stdio"
+path = "examples/simple_stdio.rs"
+required-features = ["colored"]

src/layout/mod.rs

@@ -12,10 +12,12 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#[cfg(feature = "colored")]
 pub use colored_simple_text::ColoredSimpleTextLayout;
 use log::Record;
 pub use simple_text::SimpleTextLayout;
 
+#[cfg(feature = "colored")]
 mod colored_simple_text;
 mod kv_display;
 mod simple_text;
@@ -27,18 +29,23 @@ pub trait Layout {
 #[derive(Debug)]
 pub enum LayoutImpl {
     SimpleText(SimpleTextLayout),
+    #[cfg(feature = "colored")]
     ColoredSimpleText(ColoredSimpleTextLayout),
 }
 
 macro_rules! enum_dispatch_layout {
     ($($name:ident),+) => {
         impl Layout for LayoutImpl {
             fn format_bytes(&self, record: &Record) -> anyhow::Result<Vec<u8>> {
-                match self { $( LayoutImpl::$name(layout) => layout.format_bytes(record), )+ }
+                match self { $(
+                    // opt #[cfg(feature = "colored")]
+                   LayoutImpl::$name(layout) => layout.format_bytes(record),
+                )+ }
             }
         }
 
         $(paste::paste! {
+            // opt #[cfg(feature = "colored")]
             impl From<[<$name Layout>]> for LayoutImpl {
                 fn from(layout: [<$name Layout>]) -> Self { LayoutImpl::$name(layout) }
             }