Class: Spork::Diagnoser

Inherits:
Object
  • Object
show all
Defined in:
lib/spork/diagnoser.rb

Overview

The Diagnoser hooks into load and require and keeps track of when files are required / loaded, and who loaded them. It’s used when you run spork –diagnose

Example

Spork::Diagnoser.install_hook!('/path/env.rb', '/path')
require '/path/to/env.rb'
Spork::Diagnoser.output_results(STDOUT)

Class Method Summary collapse

Class Method Details

.add_included_file(filename, callstack) ⇒ Object 



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# File 'lib/spork/diagnoser.rb', line 43

def add_included_file(filename, callstack)
  filename = expand_filename(filename)
  return unless File.exist?(filename)
  loaded_files[filename] = filter_callstack(caller) if subdirectory?(filename)
end

.install_hook!(entry_file = nil, dir = Dir.pwd) ⇒ Object

Installs the diagnoser hook into Kernel#require and Kernel#load

Parameters

  • entry_file - The file that is used to load the project. Used to filter the backtrace so anything that happens after it is hidden.

  • dir - The project directory. Any file loaded outside of this directory will not be logged.



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# File 'lib/spork/diagnoser.rb', line 21

def install_hook!(entry_file = nil, dir = Dir.pwd)
  @dir = File.expand_path(Dir.pwd, dir)
  @entry_file = entry_file
  
  Kernel.class_eval do
    alias :require_without_diagnoser :require
    alias :load_without_diagnoser :load
    
    def require(string)
      ::Spork::Diagnoser.add_included_file(string, caller)
      require_without_diagnoser(string)
    end
    private :require
    
    def load(string, wrap = false)
      ::Spork::Diagnoser.add_included_file(string, caller)
      load_without_diagnoser(string)
    end
    private :load
  end
end

.loaded_files ⇒ Object 



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# File 'lib/spork/diagnoser.rb', line 11

def loaded_files
  @loaded_files ||= {}
end

.output_results(stdout) ⇒ Object

output the results of a diagnostic run.

Parameters

  • stdout - An IO stream to output the results to.



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# File 'lib/spork/diagnoser.rb', line 67

def output_results(stdout)
  project_prefix = Dir.pwd + "/"
  minimify = lambda { |f| f.gsub(project_prefix, '')}
  stdout.puts "- Spork Diagnosis -\n"
  stdout.puts "-- Summary --"
  stdout.puts loaded_files.keys.sort.map(&minimify)
  stdout.puts "\n\n\n"
  stdout.puts "-- Detail --"
  loaded_files.keys.sort.each do |file|
    stdout.puts "\n\n\n--- #{minimify.call(file)} ---\n"
    stdout.puts loaded_files[file].map(&minimify)
  end
end

.remove_hook! ⇒ Object

Uninstall the hook. Generally useful only for testing the Diagnoser.



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# File 'lib/spork/diagnoser.rb', line 50

def remove_hook!
  return unless Kernel.private_instance_methods.map(&:to_sym).include?(:require_without_diagnoser)
  Kernel.class_eval do
    alias :require :require_without_diagnoser
    alias :load :load_without_diagnoser
    
    undef_method(:require_without_diagnoser)
    undef_method(:load_without_diagnoser)
  end
  true
end