Indent JSON when stdout is terminal

[roberth]

Is your feature request related to a problem?

Single-line JSON is hard to read, because the nesting structure is not visible.

Proposed solution

Format the JSON output by indenting it when the stdout is a terminal.

Considerations:

• Indentation can be O(n²) behavior
  • Usually not
  • User can interrupt
• JSON is for machines
  • Not when the output is a terminal

Alternative solutions

--json --indent

Defeats the utility of not having to specify that in the terminal.

Additional context

Checklist

• checked latest Nix manual (source)
• checked open feature issues and pull requests for possible duplicates

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