feat(examples): add simple example that renders markdown from a pipe

examples/stdin-stdout/main.go

@@ -0,0 +1,46 @@
+package main
+
+// A simple example that renders input through a pipe.
+//
+// Usage:
+//     echo "# Hello, world!" | go run main.go
+//
+//     cat README.md | go run main.go
+//
+//     go run main.go < README.md
+
+import (
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/charmbracelet/glamour"
+)
+
+const defaultWidth = 80
+
+func main() {
+	// Read from stdin.
+	in, err := io.ReadAll(os.Stdin)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error reading stdin: %s\n", err)
+	}
+
+	// Create a new renderer.
+	r, err := glamour.NewTermRenderer(
+		glamour.WithAutoStyle(),
+		glamour.WithWordWrap(defaultWidth),
+	)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error creating renderer: %s\n", err)
+	}
+
+	// Render markdown.
+	md, err := r.RenderBytes(in)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error rendering markdown: %s\n", err)
+	}
+
+	// Write markdown to stdout.
+	fmt.Fprintf(os.Stdout, "%s\n", md)
+}