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June 20, 2023 03:30
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flatten lists in helm and go templating
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{{- define "flatten_list" -}} | |
{{- $output := list -}} | |
{{- range . -}} | |
{{- if (kindIs "slice" . ) -}} | |
{{- $output = (concat $output ( get (fromYaml (include "flatten_list" . ) ) "list" ) ) -}} | |
{{- else -}} | |
{{- $output = (append $output . ) -}} | |
{{- end -}} | |
{{- end -}} | |
{{- toYaml (dict "list" $output) -}} | |
{{- end -}} | |
{{- define "flatten" -}} | |
{{- get ( fromYaml (include "flatten_list" . ) ) "list" | toYaml }} | |
{{- end -}} | |
{{- $nested := (list "a" "b" "c" (list 1 2 3)) -}} | |
flattend_list: | |
{{- include "flatten" $nested | nindent 4 }} |
I think it also would be possible to create a flatten
function with tail-recursion so we don't have to do fromYaml
and toYaml
, but it would be preferable to have something like this in sprig
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currently you need to jump through some hoops to make flattened list in helm