common: Add hugo.GoVersion

Closes #9849. This enables `hugo.GoVersion` in templates to access the
version of Go that the Hugo binary was built with.

common/hugo/hugo.go

@@ -53,6 +53,9 @@ type Info struct {
 	// It can be any string, but it will be all lower case.
 	Environment string
 
+	// version of go that the Hugo binary was built with
+	GoVersion string
+
 	deps []*Dependency
 }
 
@@ -87,12 +90,14 @@ func NewInfo(environment string, deps []*Dependency) Info {
 	var (
 		commitHash string
 		buildDate  string
+		goVersion  string
 	)
 
 	bi := getBuildInfo()
 	if bi != nil {
 		commitHash = bi.Revision
 		buildDate = bi.RevisionTime
+		goVersion = bi.GoVersion
 	}
 
 	return Info{
@@ -100,6 +105,7 @@ func NewInfo(environment string, deps []*Dependency) Info {
 		BuildDate:   buildDate,
 		Environment: environment,
 		deps:        deps,
+		GoVersion:   goVersion,
 	}
 }
 

common/hugo/hugo_test.go

@@ -32,6 +32,7 @@ func TestHugoInfo(t *testing.T) {
 	if bi != nil {
 		c.Assert(hugoInfo.CommitHash, qt.Equals, bi.Revision)
 		c.Assert(hugoInfo.BuildDate, qt.Equals, bi.RevisionTime)
+		c.Assert(hugoInfo.GoVersion, qt.Equals, bi.GoVersion)
 	}
 	c.Assert(hugoInfo.Environment, qt.Equals, "production")
 	c.Assert(string(hugoInfo.Generator()), qt.Contains, fmt.Sprintf("Hugo %s", hugoInfo.Version()))