Add a Version utility func

transpiler.go

@@ -5,6 +5,7 @@
 package godartsass
 
 import (
+	"bytes"
 	"encoding/binary"
 	"encoding/json"
 	"errors"
@@ -72,6 +73,24 @@ func Start(opts Options) (*Transpiler, error) {
 	return t, nil
 }
 
+// Version returns the version of the embedded Dart Sass frameworks as a JSON.
+func Version(dartSassEmbeddedFilename string) (string, error) {
+	bin, err := safeexec.LookPath(dartSassEmbeddedFilename)
+	if err != nil {
+		return "", err
+	}
+	cmd := exec.Command(bin, "--version")
+	cmd.Stderr = os.Stderr
+
+	var buf bytes.Buffer
+	cmd.Stdout = &buf
+
+	if err := cmd.Run(); err != nil {
+		return "", err
+	}
+	return buf.String(), nil
+}
+
 // Transpiler controls transpiling of SCSS into CSS.
 type Transpiler struct {
 	opts Options

transpiler_test.go

@@ -406,6 +406,16 @@ func TestHasScheme(t *testing.T) {
 	c.Assert(hasScheme("foo"), qt.Equals, false)
 }
 
+func TestVersion(t *testing.T) {
+	c := qt.New(t)
+
+	version, err := Version(getSassEmbeddedFilename())
+	c.Assert(err, qt.IsNil)
+	c.Assert(version, qt.Not(qt.Equals), "")
+	c.Assert(version, qt.Contains, "protocolVersion")
+
+}
+
 func newTestTranspiler(c *qt.C, opts Options) (*Transpiler, func()) {
 	opts.DartSassEmbeddedFilename = getSassEmbeddedFilename()
 	transpiler, err := Start(opts)