batch json shell transforms with underscore cli

process.js

/*
data.label = "Slate: "+data.label;
data.handle = "slate-"+data.handle;
data.mysql.database = "slate-"+data.mysql.database;
data.mysql.username = "slate-"+data.mysql.username;
data.parent_hostname = data.parent_hostname.replace(/([a-z]a\.slate)/, 'wa-$1');
data.primary_hostname = data.primary_hostname.replace(/([a-z]a\.slate)/, 'wa-$1');
*/

/*
if (data.parent_hostname == 'v2.slate.is') {
  data.parent_hostname = 'v3.cbl.slate.is';
  data.parent_key = 'x3b96wjVy2TsJSQt';
}
*/

if (data.parent_hostname == 'v3.cbl.slate.is') {
  data.parent_hostname = 'sub-skeleton.slatepowered.net';
  data.parent_key = 'abcedef';
}

data;

process.sh

#!/bin/bash

if [ -z "$1" ]; then
  echo "Usage: process.js <diff|apply>"
  exit 1
fi


process_script="$(cat ~/process.js)"

for site in *; do
  json_path="${site}/site.json"
  tmp_path="${site}/site.json.tmp"
  bak_path="${site}/site.json.bak"

  echo "${json_path}"

  # diff or apply file
  if [ "$1" == "apply" ]; then
    echo "Patching to ${tmp_path}"
    cat "${json_path}" | underscore process "${process_script}" > "${tmp_path}"

    if [ $? -eq 0 ]; then
      colordiff "${json_path}" "${tmp_path}"

      echo "Moving ${json_path} to ${bak_path}"
      mv "${json_path}" "${bak_path}"

      echo "Moving ${tmp_path} to ${json_path}"
      mv "${tmp_path}" "${json_path}"
    fi
  else
    colordiff "${json_path}" <(cat "${json_path}" | underscore process "${process_script}")
  fi

  # Blank line
  echo
done