Class: Nanoc::CLI::ErrorHandler Private

Inherits:
Object
  • Object
show all
Defined in:
lib/nanoc/cli/error_handler.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Catches errors and prints nice diagnostic messages, then exits.

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.disable ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Disables error handling. This is used by the test cases to prevent error from being handled by the CLI while tests are running.



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# File 'lib/nanoc/cli/error_handler.rb', line 21

def self.disable
  @disabled = true
end

.enable ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Re-enables error handling after it was disabled. This is used by the test cases to prevent error from being handled by the CLI while tests are running.



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# File 'lib/nanoc/cli/error_handler.rb', line 28

def self.enable
  @disabled = false
end

.handle_while(exit_on_error: true) ⇒ void

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.

Enables error handling in the given block.



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# File 'lib/nanoc/cli/error_handler.rb', line 11

def self.handle_while(exit_on_error: true)
  if @disabled
    yield
  else
    new.handle_while(exit_on_error: exit_on_error) { yield }
  end
end

.print_error(error) ⇒ void

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.

Prints the given error to stderr. Includes message, possible resolution (see #resolution_for), compilation stack, backtrace, etc.

Parameters:

  • error (Error) —

    The error that should be described



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# File 'lib/nanoc/cli/error_handler.rb', line 85

def self.print_error(error)
  new.print_error(error)
end

Instance Method Details

#handle_error(error, exit_on_error:) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/nanoc/cli/error_handler.rb', line 64

def handle_error(error, exit_on_error:)
  if trivial?(error)
    $stderr.puts
    $stderr.puts "Error: #{error.message}"
    resolution = resolution_for(error)
    if resolution
      $stderr.puts
      $stderr.puts resolution
    end
  else
    print_error(error)
  end
  exit(1) if exit_on_error
end

#handle_while(exit_on_error:) ⇒ void

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.

Enables error handling in the given block. This method should not be called directly; use handle_while instead.



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# File 'lib/nanoc/cli/error_handler.rb', line 36

def handle_while(exit_on_error:)
  # Set exit handler
  %w[INT TERM].each do |signal|
    Signal.trap(signal) do
      puts
      exit!(0)
    end
  end

  # Set stack trace dump handler
  if !defined?(RUBY_ENGINE) || RUBY_ENGINE != 'jruby'
    begin
      Signal.trap('USR1') do
        puts 'Caught USR1; dumping a stack trace'
        puts caller.map { |i| "  #{i}" }.join("\n")
      end
    rescue ArgumentError
    end
  end

  # Run
  yield
rescue Interrupt
  exit(1)
rescue StandardError, ScriptError => e
  handle_error(e, exit_on_error: exit_on_error)
end

#print_error(error) ⇒ void

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.

Prints the given error to stderr. Includes message, possible resolution (see #resolution_for), compilation stack, backtrace, etc.

Parameters:

  • error (Error) —

    The error that should be described



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# File 'lib/nanoc/cli/error_handler.rb', line 95

def print_error(error)
  write_compact_error(error, $stderr)

  File.open('crash.log', 'w') do |io|
    cio = Nanoc::CLI.wrap_in_cleaning_stream(io)
    cio.add_stream_cleaner(::Nanoc::CLI::StreamCleaners::ANSIColors)
    write_verbose_error(error, cio)
  end
end

#trivial?(error) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Boolean) 


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# File 'lib/nanoc/cli/error_handler.rb', line 146

def trivial?(error)
  case error
  when Nanoc::Core::TrivialError, Errno::EADDRINUSE
    true
  when LoadError
    GEM_NAMES.key?(gem_name_from_load_error(error))
  else
    false
  end
end

#write_compact_error(error, stream) ⇒ void

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.

Writes a compact representation of the error, suitable for a terminal, on the given stream (probably stderr).

Parameters:

  • error (Error) —

    The error that should be described

  • stream (IO) —

    The stream to write the description too



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# File 'lib/nanoc/cli/error_handler.rb', line 113

def write_compact_error(error, stream)
  stream.puts
  stream.puts 'Captain! We’ve been hit!'

  write_error_message(stream, error)
  write_item_rep(stream, error)
  write_stack_trace(stream, error)

  stream.puts
  stream.puts 'A detailed crash log has been written to ./crash.log.'
end

#write_verbose_error(error, stream) ⇒ void

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.

Writes a verbose representation of the error on the given stream.

Parameters:

  • error (Error) —

    The error that should be described

  • stream (IO) —

    The stream to write the description too



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# File 'lib/nanoc/cli/error_handler.rb', line 132

def write_verbose_error(error, stream)
  stream.puts "Crashlog created at #{Time.now}"

  write_error_message(stream, error, verbose: true)
  write_item_rep(stream, error, verbose: true)
  write_stack_trace(stream, error, verbose: true)
  write_version_information(stream, verbose: true)
  write_system_information(stream, verbose: true)
  write_installed_gems(stream, verbose: true)
  write_gemfile_lock(stream, verbose: true)
  write_load_paths(stream, verbose: true)
end