Module: Thor::Util

Defined in:
lib/thor/util.rb

Overview

This module holds several utilities:

1) Methods to convert thor namespaces to constants and vice-versa.

Thor::Utils.namespace_from_thor_class(Foo::Bar::Baz) #=> "foo:bar:baz"

2) Loading thor files and sandboxing:

Thor::Utils.load_thorfile("~/.thor/foo")

Class Method Summary collapse

Class Method Details

.camel_case(str) ⇒ Object

Receives a string and convert it to camel case. camel_case returns CamelCase.

Parameters

String

Returns

String


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# File 'lib/thor/util.rb', line 104

def self.camel_case(str)
  return str if str !~ /_/ && str =~ /[A-Z]+.*/
  str.split('_').map { |i| i.capitalize }.join
end

.find_by_namespace(namespace) ⇒ Object

Receives a namespace and search for it in the Thor::Base subclasses.

Parameters

namespace<String>

The namespace to search for.


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# File 'lib/thor/util.rb', line 24

def self.find_by_namespace(namespace)
  namespace = "default#{namespace}" if namespace.empty? || namespace =~ /^:/
  Thor::Base.subclasses.find { |klass| klass.namespace == namespace }
end

.find_class_and_task_by_namespace(namespace, fallback = true) ⇒ Object

Receives a namespace and tries to retrieve a Thor or Thor::Group class from it. It first searches for a class using the all the given namespace, if it's not found, removes the highest entry and searches for the class again. If found, returns the highest entry as the class name.

Examples

class Foo::Bar < Thor
  def baz
  end
end

class Baz::Foo < Thor::Group
end

Thor::Util.namespace_to_thor_class("foo:bar")     #=> Foo::Bar, nil # will invoke default task
Thor::Util.namespace_to_thor_class("baz:foo")     #=> Baz::Foo, nil
Thor::Util.namespace_to_thor_class("foo:bar:baz") #=> Foo::Bar, "baz"

Parameters

namespace<String>


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# File 'lib/thor/util.rb', line 131

def self.find_class_and_task_by_namespace(namespace, fallback = true)
  if namespace.include?(?:) # look for a namespaced task
    pieces = namespace.split(":")
    task   = pieces.pop
    klass  = Thor::Util.find_by_namespace(pieces.join(":"))
  end
  unless klass # look for a Thor::Group with the right name
    klass, task = Thor::Util.find_by_namespace(namespace), nil
  end
  if !klass && fallback # try a task in the default namespace
    task = namespace
    klass = Thor::Util.find_by_namespace('')
  end
  return klass, task
end

.globs_for(path) ⇒ Object

Where to look for Thor files.


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# File 'lib/thor/util.rb', line 210

def self.globs_for(path)
  ["#{path}/Thorfile", "#{path}/*.thor", "#{path}/tasks/*.thor", "#{path}/lib/tasks/*.thor"]
end

.load_thorfile(path, content = nil, debug = false) ⇒ Object

Receives a path and load the thor file in the path. The file is evaluated inside the sandbox to avoid namespacing conflicts.


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# File 'lib/thor/util.rb', line 150

def self.load_thorfile(path, content=nil, debug=false)
  content ||= File.binread(path)

  begin
    Thor::Sandbox.class_eval(content, path)
  rescue Exception => e
    $stderr.puts "WARNING: unable to load thorfile #{path.inspect}: #{e.message}"
    if debug
      $stderr.puts *e.backtrace
    else
      $stderr.puts e.backtrace.first
    end
  end
end

.namespace_from_thor_class(constant) ⇒ Object

Receives a constant and converts it to a Thor namespace. Since Thor tasks can be added to a sandbox, this method is also responsable for removing the sandbox namespace.

This method should not be used in general because it's used to deal with older versions of Thor. On current versions, if you need to get the namespace from a class, just call namespace on it.

Parameters

constant<Object>

The constant to be converted to the thor path.

Returns

String

If we receive Foo::Bar::Baz it returns “foo:bar:baz”


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# File 'lib/thor/util.rb', line 43

def self.namespace_from_thor_class(constant)
  constant = constant.to_s.gsub(/^Thor::Sandbox::/, "")
  constant = snake_case(constant).squeeze(":")
  constant
end

.namespaces_in_content(contents, file = __FILE__) ⇒ Object

Given the contents, evaluate it inside the sandbox and returns the namespaces defined in the sandbox.

Parameters

contents<String>

Returns

Array


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# File 'lib/thor/util.rb', line 58

def self.namespaces_in_content(contents, file=__FILE__)
  old_constants = Thor::Base.subclasses.dup
  Thor::Base.subclasses.clear

  load_thorfile(file, contents)

  new_constants = Thor::Base.subclasses.dup
  Thor::Base.subclasses.replace(old_constants)

  new_constants.map!{ |c| c.namespace }
  new_constants.compact!
  new_constants
end

.ruby_commandObject

Return the path to the ruby interpreter taking into account multiple installations and windows extensions.


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# File 'lib/thor/util.rb', line 217

def self.ruby_command
  @ruby_command ||= begin
    ruby = File.join(RbConfig::CONFIG['bindir'], RbConfig::CONFIG['ruby_install_name'])
    ruby << RbConfig::CONFIG['EXEEXT']

    # escape string in case path to ruby executable contain spaces.
    ruby.sub!(/.*\s.*/m, '"\&"')
    ruby
  end
end

.snake_case(str) ⇒ Object

Receives a string and convert it to snake case. SnakeCase returns snake_case.

Parameters

String

Returns

String


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# File 'lib/thor/util.rb', line 90

def self.snake_case(str)
  return str.downcase if str =~ /^[A-Z_]+$/
  str.gsub(/\B[A-Z]/, '_\&').squeeze('_') =~ /_*(.*)/
  return $+.downcase
end

.thor_classes_in(klass) ⇒ Object

Returns the thor classes declared inside the given class.


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# File 'lib/thor/util.rb', line 74

def self.thor_classes_in(klass)
  stringfied_constants = klass.constants.map { |c| c.to_s }
  Thor::Base.subclasses.select do |subclass|
    next unless subclass.name
    stringfied_constants.include?(subclass.name.gsub("#{klass.name}::", ''))
  end
end

.thor_rootObject

Returns the root where thor files are located, dependending on the OS.


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# File 'lib/thor/util.rb', line 189

def self.thor_root
  File.join(user_home, ".thor").gsub(/\\/, '/')
end

.thor_root_globObject

Returns the files in the thor root. On Windows thor_root will be something like this:

C:\Documents and Settings\james\.thor

If we don't #gsub the \ character, Dir.glob will fail.


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# File 'lib/thor/util.rb', line 200

def self.thor_root_glob
  files = Dir["#{thor_root}/*"]

  files.map! do |file|
    File.directory?(file) ? File.join(file, "main.thor") : file
  end
end

.user_homeObject


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# File 'lib/thor/util.rb', line 165

def self.user_home
  @@user_home ||= if ENV["HOME"]
    ENV["HOME"]
  elsif ENV["USERPROFILE"]
    ENV["USERPROFILE"]
  elsif ENV["HOMEDRIVE"] && ENV["HOMEPATH"]
    File.join(ENV["HOMEDRIVE"], ENV["HOMEPATH"])
  elsif ENV["APPDATA"]
    ENV["APPDATA"]
  else
    begin
      File.expand_path("~")
    rescue
      if File::ALT_SEPARATOR
        "C:/"
      else
        "/"
      end
    end
  end
end