How to merge multiple YAML templates

[MarV1908]

Hello,

First, thanks for the great work on Gomplate!

I'm trying to merge a rendered YAML template with one or multiple overrides dynamically. This is similar to how Helm library charts allow merging YAML values.

Goal

1. Take a base YAML template.
2. Merge it with one or multiple override templates.
3. Output the merged result.

This is the Helm "function" i'm trying to mimic :

{{- define "mylibchart.util.merge" -}}
{{- $top := first . -}}
{{- $overrides := fromYaml (include (index . 1) $top) | default (dict) -}}
{{- $tpl := fromYaml (include (index . 2) $top) | default (dict) -}}
{{- toYaml (merge $overrides $tpl) -}}
{{- end -}}

https://helm.sh/docs/topics/library_charts/#create-a-simple-library-chart

Issues Encountered

• Dynamic Includes: In Helm, include cannot be used inside parentheses, making it tricky to process multiple templates dynamically.
• Merging Multiple Overrides: I need a way to recursively merge multiple YAML templates while preserving structure.

How would this be done in Gomplate? Is there a recommended approach for merging multiple YAML templates dynamically?

Thanks!