Extend pkg/expr functions

pkg/expr/func_str.go

@@ -1,8 +1,10 @@
 package expr
 
 import (
-	"github.com/PaesslerAG/gval"
+	"fmt"
 	"strings"
+
+	"github.com/PaesslerAG/gval"
 )
 
 func StringFunctions() []gval.Language {
@@ -15,6 +17,7 @@ func StringFunctions() []gval.Language {
 		gval.Function("toUpper", strings.ToUpper),
 		gval.Function("shortest", shortest),
 		gval.Function("longest", longest),
+		gval.Function("format", fmt.Sprintf),
 	}
 }
 

pkg/expr/func_time.go

@@ -1,9 +1,10 @@
 package expr
 
 import (
+	"time"
+
 	"github.com/PaesslerAG/gval"
 	"github.com/lestrrat-go/strftime"
-	"time"
 )
 
 func TimeFunctions() []gval.Language {
@@ -64,6 +65,6 @@ func modTime(t time.Time, mod interface{}) (time.Time, error) {
 // More details here:
 // https://github.com/lestrrat-go/strftime#supported-conversion-specifications
 func strfTime(t time.Time, f string) string {
-	o, _ := strftime.Format(f, t)
+	o, _ := strftime.Format(f, t, strftime.WithMilliseconds('b'))
 	return o
 }