Why does my template break?

[jfmercer]

My goal is to have a script execute only if the OS is Darwin and installMacApps is set to true. But it breaks every time.

My .chezmoi.yaml.tmpl looks like this:

{{- $interactive := stdinIsATTY -}}
{{- $email := "[email protected]" -}}
{{- $installMacApps := true -}}

{{- if $interactive -}}
{{-   $email := promptString "email for .gitconfig" -}}
{{-   $installMacApps := eq (promptString "Install Mac applications (y/n)") "y" -}}
{{- end -}}

data:
  email: {{ $email | quote }}
  github_username: {{ $github_username | quote }}
  installMacApps: {{ $installMacApps }}

When I test the template, it looks good. chezmoi execute-template --init < .chezmoi.yaml.tmpl gives the following:

data:
  email: "[email protected]"
  installMacApps: true

Yet, chezmoi init && chezmoi apply errors out: chezmoi: template: .chezmoiscripts/darwin/run_onchange_after_configure_10_homebrew.sh.tmpl:1:37: executing ".chezmoiscripts/darwin/run_onchange_after_configure_10_homebrew.sh.tmpl" at <.installMacApps>: map has no entry for key "installMacApps".

That file begins with {{- if and (eq .chezmoi.os "darwin") (eq .installMacApps true) -}}. I also tried {{- if and (eq .chezmoi.os "darwin") .installMacApps -}}, but no luck.

What I am doing wrong?

[twpayne]

That file begins with {{- if and (eq .chezmoi.os "darwin") (eq .installMacApps true) -}}. I also tried {{- if and (eq .chezmoi.os "darwin") .installMacApps -}}, but no luck.

The problem here is that .installMacApps in the first line of the file is not defined when you run chezmoi init for the first time.

Note also this line:
{{- $installMacApps := eq (promptString "Install Mac applications (y/n)") "y" -}}
is incorrect. The := creates a new $installMacApps variable that is scoped within the if statement. You need:
{{- $installMacApps = eq (promptString "Install Mac applications (y/n)") "y" -}}
instead. Note the := is replaced with =: this modifies the existing $installMacApps variable.

[jfmercer]

@twpayne Thank you for your kind response. I had no idea that I was scoping those variables within the if statement. Perhaps I should study a little Go if I continue to use chezmoi extensively. In any case, you got me unstuck. I discovered that chezmoi init was not writing over config file, so no amount of reinitialization could get installMacApps defined. chezmoi purge fixed this for me. In any case, your comment got me unstuck & moving forward again. Many thanks!