Output formatting

[TomWright]

Add a new flag to dasel to allow users to format output using golang text templating.

This saves additional logic when trying to achieve something like this: #146

The template context will be given each output record as the root data object, allowing you to access it via ..

You'll also have access to a Select function that will take a single argument. This can be used to select items from the output record using dasel selector syntax vs templating record syntax.

Example usage:

[
  {
    "name": "Tom",
    "email": "tom@gmail.com",
    "active": true
  },
  {
    "name": "Jim",
    "email": "jim@gmail.com",
    "active": true
  },
  {
    "name": "Frank",
    "email": "frank@gmail.com",
    "active": false
  }
]

dasel -f users.json -m '.(.active=true)' --template "{{ Select(\".name\"}}, {{ Select(\".email\"}}"

"Tom", "tom@gmail.com"
"Frank", "frank@gmail.com"

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This idea is still a work in progress and I'm open to suggestions on how it could work.

Any thoughts?

[TomWright]

I'm adding this functionality in #151.

The syntax differs slightly from the above, please refer to the documentation.