Make go templating left and right delimiter customizable.

[lalyos]

Lately i tried to generate packer.io files. But packer itself uses go templating.

So you have to replace all {{ with {{"{{"}} and the same goes: }} to {{"}}"}}. It makes the template really hard tpo read. With the propose env variables sigil could use, let's say triple braces to generate files which use go templating:

I'm able to switch on a section with a variable:

SIGIL_LEFT_DELIM={{{ SIGIL_RIGHT_DELIM=}}} sigil -f packer.tmpl atlas=true

or switch off:

SIGIL_LEFT_DELIM={{{ SIGIL_RIGHT_DELIM=}}} sigil -f packer.tmpl atlas=true

content of packer.tmpl:

{
  "variables": {
    "mock": "{{ env `MOCK` }}",

    "aws_access_key": "{{ env `AWS_ACCESS_KEY` }}",
    "aws_secret_key": "{{ env `AWS_SECRET_ACCESS_KEY` }}"
  },

  {{{ with $atlas }}}
  "post-processors": [
    {
      "type": "atlas",
      "artifact": "sequenceiq/{{ user `atlas_artifact` }}",
      "artifact_type": "{{ build_name }}.image"
    }
  ]
  {{{ end }}}
}

[progrium]

Cool. Can we make it a single variable since it's one thing. You'd never just change one of them. Maybe call it SIGIL_DELIMS with a value like {{{,}}}.

[lalyos]

Good point. Just changed it, and added a section to README explaining the reason.

Maybe we can define configuration for separating left and right delims in SIGIL_DELIMS like SIGIL_DELIM_SEPARATOR=,
;)

[progrium]

lol

[Dominik-K]

@progrium Unfortunately, the two env variants made it into the 0.4.0 release. Took me some time to figure this out.
With the upcoming 0.4.1 release, the SIGIL_DELIMS will be used.