fix(output): cache lipgloss renderers (#52)

* fix(output): cache lipgloss renderers

Cache and reuse lipgloss renderers to avoid concurrently querying the
terminal for background colors. Lipgloss HasDarkBackground function
queries the terminal for the background color. Creating multiple logger
instances with the same output will query the output multiple times
causing Log to hange and/or freeze.

To solve this, we store and retrieve the Lipgloss renderer in a global
sync.Map for each output along with caching the background/foreground
colors of the underlying Termenv Output.

Fixes: #50

* Update logger.go

Co-authored-by: Carlos Alexandro Becker <caarlos0@users.noreply.github.com>

---------

Co-authored-by: Carlos Alexandro Becker <caarlos0@users.noreply.github.com>

go.mod

@@ -5,6 +5,7 @@ go 1.17
 require (
 	github.com/charmbracelet/lipgloss v0.7.1
 	github.com/go-logfmt/logfmt v0.6.0
+	github.com/muesli/termenv v0.15.1
 	github.com/stretchr/testify v1.8.2
 )
 
@@ -15,7 +16,6 @@ require (
 	github.com/mattn/go-isatty v0.0.18 // indirect
 	github.com/mattn/go-runewidth v0.0.14 // indirect
 	github.com/muesli/reflow v0.3.0 // indirect
-	github.com/muesli/termenv v0.15.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/rivo/uniseg v0.2.0 // indirect
 	golang.org/x/sys v0.6.0 // indirect

logger.go

@@ -12,6 +12,7 @@ import (
 	"sync/atomic"
 
 	"github.com/charmbracelet/lipgloss"
+	"github.com/muesli/termenv"
 )
 
 var (
@@ -252,7 +253,13 @@ func (l *Logger) SetOutput(w io.Writer) {
 		isDiscard = 1
 	}
 	atomic.StoreUint32(&l.isDiscard, isDiscard)
-	l.re = lipgloss.NewRenderer(w)
+	// Reuse cached renderers
+	if v, ok := registry.Load(w); ok {
+		l.re = v.(*lipgloss.Renderer)
+	} else {
+		l.re = lipgloss.NewRenderer(w, termenv.WithColorCache(true))
+		registry.Store(w, l.re)
+	}
 }
 
 // SetFormatter sets the formatter.

pkg.go

@@ -10,7 +10,13 @@ import (
 	"time"
 )
 
-var defaultLogger = NewWithOptions(os.Stderr, Options{ReportTimestamp: true})
+var (
+	// registry is a map of all registered lipgloss renderers.
+	registry = sync.Map{}
+
+	// defaultLogger is the default global logger instance.
+	defaultLogger = NewWithOptions(os.Stderr, Options{ReportTimestamp: true})
+)
 
 // Default returns the default logger. The default logger comes with timestamp enabled.
 func Default() *Logger {