Any "COALESCE" like templating function?

[Lockszmith-GH]

I currently have the following code in my .chezmoi.toml.tmpl

{{- $githubToken := (env "CHEZMOI_GITHUB_ACCESS_TOKEN") -}}
{{- if not ($githubToken) -}}
{{-   $githubToken = (env "GITHUB_ACCESS_TOKEN") -}}
{{- end -}}
{{- if not ($githubToken) -}}
{{-   $githubToken = (env "GITHUB_TOKEN") -}}
{{- end -}}
{{- if not ($githubToken) -}}
{{-   $githubToken = promptStringOnce . "githubToken" "Public GITHUB token (mostly for rate limits - !insecure!)" -}}
{{- end -}}

Is there a more efficient syntax for getting the first non-empty value?

[twpayne]

The builtin or function does this. From the docs:

or

Returns the boolean OR of its arguments by returning the first non-empty argument or the last argument, that is, "or x y" behaves as "if x then x else y". Evaluation proceeds through the arguments left to right and returns when the result is determined.

[Lockszmith-GH]

Thanks! https://pkg.go.dev/text/template#hdr-Functions works beautifully

> A=1 B=2 C=3 Chezmoi execute-template '{{ or (env "A") (env "B") (env "C") }}' && echo ''
1

> B=2 C=3 Chezmoi execute-template '{{ or (env "A") (env "B") (env "C") }}' && echo ''    
2

> C=3 Chezmoi execute-template '{{ or (env "A") (env "B") (env "C") }}' && echo ''    
3

Cleaned up my code, and it is now:

{{- $githubToken := or (env "CHEZMOI_GITHUB_ACCESS_TOKEN") (env "GITHUB_ACCESS_TOKEN") (env "GITHUB_TOKEN") }}
{{- if not ($githubToken) }}
{{-   $githubToken = promptStringOnce . "githubToken" "Public GITHUB token (mostly for rate limits - !insecure!)" }}
{{- end }}

Much cleaner.