Added golines playground

cmds/golines/format.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/golangci/golines/shorten"
+)
+
+func formatSource(source string, maxLen int) (output []byte, err error) {
+	// Dependency panics must not escape the JS callback and terminate the WASM runtime.
+	defer func() {
+		if recovered := recover(); recovered != nil {
+			output = nil
+			err = fmt.Errorf("golines could not format this input (internal panic: %v). Ensure the input is a complete Go file, including a package declaration", recovered)
+		}
+	}()
+
+	tabLen := 4
+	if maxLen < 80 {
+		tabLen = 2
+	}
+	return shorten.NewShortener(&shorten.Config{
+		MaxLen:          maxLen,
+		TabLen:          tabLen,
+		ShortenComments: true,
+		ReformatTags:    true,
+		ChainSplitDots:  true,
+	}).Process([]byte(source))
+}