Implement email sending wf functions

pkg/codegen/assets/afunc.gen.go.tpl

@@ -75,7 +75,8 @@ type (
 {{ range .Params }}
 {{- if gt (len .Types) 1 }}
 {{ $name := .Name }}
-func (a {{ $ARGS }}) {{ export "get" $name }}() (bool, {{ range .Types }}{{ .GoType }},{{ end }}) {
+{{ $isArray := .IsArray }}
+func (a {{ $ARGS }}) {{ export "get" $name }}() (bool, {{ range .Types }}{{ if $isArray }}[]{{ end }}{{ .GoType }},{{ end }}) {
 	return a.has{{ export $name }}{{ range .Types }}, a.{{ $name }}{{ export .Suffix }}{{ end }}
 }
 {{- end }}
@@ -250,6 +251,7 @@ func (h {{ $.Name }}Handler) {{ export .Name }}() *atypes.Function {
 
 	{{ range . }}
 		{{ $name := .Name }}
+		{{ $isArray := .IsArray }}
 		{{ if gt (len .Types) 1 }}
 		// Converting {{ export .Name }} argument
 		if args.has{{ export .Name }} {
@@ -257,7 +259,7 @@ func (h {{ $.Name }}Handler) {{ export .Name }}() *atypes.Function {
 			switch aux.Type() {
 		{{- range .Types }}
 			case h.reg.Type({{ printf "%q" .WorkflowType }}).Type():
-				args.{{ $name }}{{ export .Suffix }} = aux.Get().({{ .GoType }})
+				args.{{ $name }}{{ export .Suffix }} = aux.Get().({{ if $isArray }}[]{{ end }}{{ .GoType }})
 		{{- end -}}
 			}
 		}

pkg/codegen/assets/expr_types.gen.go.tpl

@@ -8,7 +8,6 @@ package {{ .Package }}
 // Definitions file that controls how this file is generated:
 // {{ .Source }}
 
-{{ if .Imports }}
 import (
 	"context"
 	"fmt"
@@ -19,13 +18,10 @@ import (
 	. "github.com/cortezaproject/corteza-server/pkg/expr"
 {{- end }}
 )
-{{ end }}
-
 
 var _ = context.Background
 var _ = fmt.Errorf
 
-
 {{ range $exprType, $def := .Types }}
 // {{ $exprType }} is an expression type, wrapper for {{ $def.As }} type
 type {{ $exprType }} struct{ value {{ $def.As }} }