fix(ansi): register chroma themes in NewRenderContext

ansi/chroma.go

@@ -1,10 +1,18 @@
 package ansi
 
 import (
+	"sync"
+
 	"github.com/alecthomas/chroma/v2"
 	"github.com/alecthomas/chroma/v2/styles"
 )
 
+var (
+	// mutex for synchronizing access to the chroma style registry.
+	// Related https://github.com/alecthomas/chroma/pull/650
+	mutex = sync.Mutex{}
+)
+
 func chromaStyle(style StylePrimitive) string {
 	var s string
 
@@ -48,6 +56,7 @@ func ChromaRegister(cfg *StyleConfig) *chroma.Style {
 		return nil
 	}
 
+	mutex.Lock()
 	// Register the theme if it doesn't already exist.
 	_, ok := styles.Registry[theme]
 	if !ok && rules.Chroma != nil {
@@ -89,6 +98,7 @@ func ChromaRegister(cfg *StyleConfig) *chroma.Style {
 			),
 		)
 	}
+	mutex.Unlock()
 
 	return style
 }

ansi/context.go

@@ -19,6 +19,7 @@ type RenderContext struct {
 
 // NewRenderContext returns a new RenderContext.
 func NewRenderContext(options Options) RenderContext {
+	ChromaRegister(&options.Styles)
 	return RenderContext{
 		options:    options,
 		blockStack: &BlockStack{},