feat: upstream enterprise preview (#1841)

feat: upstream enterprise preview

---------

Signed-off-by: Oliver Baehler <oliver@sudo-i.net>
Co-authored-by: CorentinPtrl <pitrel.corentin@gmail.com>

pkg/template/unstructured.go

@@ -8,10 +8,13 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"strings"
 	"text/template"
 
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	kyaml "k8s.io/apimachinery/pkg/util/yaml"
+
+	"github.com/projectcapsule/capsule/pkg/template/functions"
 )
 
 // RenderUnstructuredItems attempts to render a given string template into a list of unstructured resources.
@@ -20,7 +23,7 @@ func RenderUnstructuredItems(
 	key MissingKeyOption,
 	tplString string,
 ) (items []*unstructured.Unstructured, err error) {
-	tmpl, err := template.New("tpl").Option("missingkey=" + key.String()).Funcs(ExtraFuncMap()).Parse(tplString)
+	tmpl, err := template.New("tpl").Option("missingkey=" + key.String()).Funcs(functions.ExtraFuncMap()).Parse(tplString)
 	if err != nil {
 		return
 	}
@@ -42,7 +45,7 @@ func RenderUnstructuredItems(
 			}
 
 			// Skip pure whitespace/--- separators that decode to nil/empty.
-			return nil, fmt.Errorf("decode yaml: %w", err)
+			return nil, fmt.Errorf("decode yaml: %w\nrendered template:\n%s", err, withLineNumbers(rendered.String()))
 		}
 
 		if len(obj) == 0 {
@@ -59,3 +62,17 @@ func RenderUnstructuredItems(
 
 	return out, nil
 }
+
+func withLineNumbers(s string) string {
+	lines := strings.Split(s, "\n")
+
+	width := len(fmt.Sprintf("%d", len(lines)))
+
+	var b strings.Builder
+
+	for i, line := range lines {
+		fmt.Fprintf(&b, "%*d | %s\n", width, i+1, line)
+	}
+
+	return b.String()
+}