Method: ReactNativeUtil::Util#validate_commands!

Defined in:
lib/react_native_util/util.rb

#validate_commands!(commands) ⇒ Object

Validate one or more commands. If the specified command is not available in the PATH (via which), a ConversionError is raised noting the package to be installed (from Homebrew, e.g.).

When package names to be installed differ from command names, a Hash may be used. For example:

validate_commands! [:yarn, 'react-native' => 'react-native-cli']

Parameters:

  • commands (Array, Hash, #to_s) —

    one or more commands to be validated.

Raises:

  • ConversionError if any command not found



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# File 'lib/react_native_util/util.rb', line 120

def validate_commands!(commands)
  errors = []

  case commands
  when Array
    # Validate each command in the array, accumulating error messages
    # if necessary.
    commands.each do |c|
      begin
        validate_commands! c
      rescue ConversionError => e
        errors += e.message.split("\n")
      end
    end
  when Hash
    # Each key represents a command to check. The value is the package to
    # install if missing.
    commands.each do |key, value|
      next if have_command?(key)

      errors << "#{key} command not found. Please install #{value} to continue."
    end
  else
    # commands is a single command to be validated. The package name is the
    # same. Usually a symbol or a string, but only has to respond to #to_s.
    errors << "#{commands} command not found. Please install #{commands} to continue." unless have_command? commands
  end

  return if errors.empty?

  raise ConversionError, errors.join("\n")
end