Helm modify a multiline string line by line

Question

I have a function which returns a multiline string. This function is called at severale places - so I don't want to modify it.However at one place I need to prefix each line with a character.

{{- define "myfunc" -}}
aaa
bbb
ccc
ddd
{{- end -}}

At one place in my templates I need to bind these to a list as elements with prefix "-"

expected result:

args:
  - aaa
  - bbb
  - ccc
  - ddd

My attempt 1:

   args:
     - {{- include "myfunc" . | nindent 8 }} 

result:

 args:
  - 
  aaa
  bbb
  ccc
  ddd

My attempt 2:

  iterating over it, something like
   args:
     {{- range include "myfunc" . }}
     - {{ . }}
     {{- end }}  

result:

Error: template : .... range can't iterate over aaa
   bbb
   ccc
   ddd

My actual solution:
Just copy the existing function with a bit of modification

{{- define "myfunc2" -}}
- aaa
- bbb
- ccc
- ddd
{{- end -}}

The question is how to bind the original function's result to args? How to apply a modification to each line?

Answer 1

You may be able to treat it as a set of string data, and then process it in the same way as a string

_helper.yaml

{{- define "myfunc" -}}
aaa
bbb
ccc
ddd
{{- end -}}

template/xxx.yaml

args: 
{{- $data := include "myfunc" . }}
{{- range ( split "\n" $data) }}
  - {{ . }}
{{- end }}

output:

args: 
  - aaa
  - bbb
  - ccc
  - ddd