Allow "jsonify" to pretty print JSON

[seanprashad]

Fixes #5040: Allow "jsonify" to pretty print JSON

This PR replaces json.Marshal with json.MarshalIndent, to return pretty-printed output instead of compact. A sensible spacing of two spaces has chosen for the indentation.

[CLAassistant]

All committers have signed the CLA.

[seanprashad]

Getting some very weird behaviour here - when I switched to json.MarshalIndent and updated the respective table test, there was a panic occurring. I was looking into the docs for template.HTML but everything looked ok at first glance.

[seanprashad]

Respective logs from Travis: https://travis-ci.org/gohugoio/hugo/jobs/444259677#L759

[seanprashad]

Currently running on go version go1.11.1 darwin/amd64 if that helps

[seanprashad]

Update: template.HTML("[\n \"a\",\n \"b\"\n]") was the answer - I had to escape quotes

[seanprashad]

Small snippet for how json.MarshalIndent works:

package main

import (
	"encoding/json"
	"fmt"
	"log"
)

func main() {

	data := []string{"A", "B", "C"}

	json, err := json.MarshalIndent(data, "", "  ")
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(string(json))
}

prints:

[
  "A",
  "B",
  "C"
]

[bep]

Thanks for this, and a special thanks for keeping the commit message in line ... so I could just click the button

[github-actions]

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