prettify json files in git project before comparing

home-bin-prettify

#!/bin/zsh

# Staged files
{ git diff --name-only --diff-filter=d --relative & 
# Staged files
git diff --cached --name-only --relative &
# Unstaged new files
git ls-files --others --exclude-standard } |
# Remove duplicates
sort -u |
# Filter to the files we're interested in.
egrep '(dg5|df5|json)$' |
# Replace newlines with null terminators
tr "\n" "\0" |
# Call the script for each entry terminated by a null terminator (rather than space or newline, which breaks for filenames with space).
xargs -0 -n1 ~/.bin/prettify.rb

home-bin-prettify.rb

#!/usr/bin/env ruby

require "json"

class PrettifyFile
  def initialize(filename)
    @filename = filename
  end

  attr_reader :filename

  def run
    contents = File.open(filename).read
    new_contents = JSON.pretty_generate(JSON.parse(contents))
    if new_contents != contents
      puts colorize("#{filename} was prettified.", :yellow)
      File.open(filename, "w").write(new_contents)
    else
      puts colorize("#{filename} stayed the same.", :green)
    end
  rescue JSON::ParserError => e
    puts colorize("Error: #{filename} could not be parsed: #{e}", :red)
  rescue Errno::ENOENT
    puts colorize("Warning: #{filename} could not be prettified because it's been deleted.", :yellow)
  end

  private

  def colorize(text, color = "default", bgColor = "default")
    colors = {
      default: "38",
      black: "30",
      red: "31",
      green: "32",
      brown: "33",
      blue: "34",
      purple: "35",
      cyan: "36",
      gray: "37",
      dark_gray: "1;30",
      light_red: "1;31",
      light_green: "1;32",
      yellow: "1;33",
      light_blue: "1;34",
      light_purple: "1;35",
      light_cyan: "1;36",
      white: "1;37",
    }
    bgColors = {
      default: "0",
      black: "40",
      red: "41",
      green: "42",
      brown: "43",
      blue: "44",
      purple: "45",
      cyan: "46",
      gray: "47",
      dark_gray: "100",
      light_red: "101",
      light_green: "102",
      yellow: "103",
      light_blue: "104",
      light_purple: "105",
      light_cyan: "106",
      white: "107",
    }
    color_code = colors[color]
    bgColor_code = bgColors[bgColor]
    return "\033[#{bgColor_code};#{color_code}m#{text}\033[0m"
  end
end

PrettifyFile.new(ARGV[0]).run