Format logger output

Cargo.lock

@@ -1097,6 +1097,7 @@ dependencies = [
  "num-derive",
  "num-traits",
  "ostd-macros",
+ "owo-colors",
  "pod",
  "rsdp",
  "spin 0.9.8",

ostd/Cargo.toml

@@ -36,8 +36,15 @@ tdx-guest = { version = "0.1.0", optional = true }
 trapframe = { git = "https://github.com/asterinas/trapframe-rs", rev = "4739428" }
 # This version is in the upstream trunk branch which fixes a `r#try` usage.
 # We could switch back to "crates.io" when they publish a new version.
-unwinding = { git = "https://github.com/nbdd0121/unwinding.git", rev = "d7cd46e", default-features = false, features = ["fde-gnu-eh-frame-hdr", "hide-trace", "panic", "personality", "unwinder"] }
+unwinding = { git = "https://github.com/nbdd0121/unwinding.git", rev = "d7cd46e", default-features = false, features = [
+    "fde-gnu-eh-frame-hdr",
+    "hide-trace",
+    "panic",
+    "personality",
+    "unwinder",
+] }
 volatile = { version = "0.4.5", features = ["unstable"] }
+owo-colors = { version = "3", optional = true }
 
 [target.x86_64-unknown-none.dependencies]
 x86_64 = "0.14.2"
@@ -46,7 +53,13 @@ acpi = "4.1.1"
 aml = "0.16.3"
 multiboot2 = "0.20.2"
 rsdp = "2.0.0"
-iced-x86 = { version = "1.21.0", default-features = false, features = [ "no_std", "decoder", "gas" ], optional = true }
+iced-x86 = { version = "1.21.0", default-features = false, features = [
+    "no_std",
+    "decoder",
+    "gas",
+], optional = true }
 
 [features]
+default = ["log_color"]
+log_color = ["dep:owo-colors"]
 intel_tdx = ["dep:tdx-guest", "dep:iced-x86"]

ostd/src/logger.rs

@@ -2,9 +2,12 @@
 
 //! Logging support.
 
+use alloc::format;
+
 use log::{LevelFilter, Metadata, Record};
 
 use crate::{
+    arch::timer::Jiffies,
     boot::{kcmdline::ModuleArg, kernel_cmdline},
     early_println,
 };
@@ -19,9 +22,33 @@ impl log::Log for Logger {
     }
 
     fn log(&self, record: &Record) {
-        if self.enabled(record.metadata()) {
+        if !self.enabled(record.metadata()) {
-            early_println!("[{}]: {}", record.level(), record.args());
+            return;
         }
+
+        let timestamp = format!("[{:>10?}]", Jiffies::elapsed().as_duration().as_secs_f64());
+        let level = format!("{:<5}", record.level());
+        let record_str = format!("{}", record.args());
+
+        #[cfg(feature = "log_color")]
+        let (timestamp, level, record_str) = {
+            use alloc::string::ToString;
+
+            use owo_colors::OwoColorize;
+
+            let timestamp = timestamp.green();
+            let level = match record.level() {
+                log::Level::Error => level.red().to_string(),
+                log::Level::Warn => level.bright_yellow().to_string(),
+                log::Level::Info => level.blue().to_string(),
+                log::Level::Debug => level.bright_green().to_string(),
+                log::Level::Trace => level.bright_black().to_string(),
+            };
+            let record_str = record_str.default_color();
+            (timestamp, level, record_str)
+        };
+
+        early_println!("{} {}: {}", timestamp, level, record_str);
     }
 
     fn flush(&self) {}