retheme-vscode.rb

#!/usr/bin/env ruby

# 1. save this somewhere on your path as 'retheme'
# 2. chmod u+x retheme

require 'json'
require 'fileutils'

THEMES = {
  # shorthand-name => Actual theme name
  'default' => 'GitHub Light Default',
  'light' => 'GitHub Light Default',
  'dark' => 'GitHub Dark Default',
  'solarlight' => 'Solarized Light',
  'solardark' => 'Solarized Dark',
  'dracula' => 'Dracula',
  'dark1' => 'Default Dark+',
  'monokai' => 'Monokai',
  'nightowl' => 'Night Owl',
  'nord' => 'Nord',
  'atom1light' => 'Atom One Light',
  'tomnight' => 'Tomorrow Night',
  'tomnightbright' => 'Tomorrow Night Bright'
}.freeze

puts "Available themes: (pass short name as arg to choose it)"
THEMES.each do |short_name, full_name|
  puts "  #{short_name}: #{full_name}"
end
puts ""

def main
  new_theme_name = ARGV.shift || THEMES.keys.sample
  new_theme = THEMES.fetch(new_theme_name)

  cwd = Dir.pwd
  vscode_settings_dir_path = File.absolute_path(File.join(cwd, '.vscode'))
  vscode_settings_file = File.absolute_path(File.join(cwd, '.vscode/settings.json'))

  FileUtils.mkdir(vscode_settings_dir_path) unless Dir.exist?(vscode_settings_dir_path)

  settings = if File.exist?(vscode_settings_file)
               JSON.parse(File.read(vscode_settings_file))
             else
               {}
             end

  puts "Changing VS Code theme to: #{new_theme}"
  settings['workbench.colorTheme'] = new_theme

  File.write(vscode_settings_file, JSON.pretty_generate(settings))
end

main