Module: ChefAPI::Util

Extended by:
Util
Included in:
Util
Defined in:
lib/chef-api/util.rb

Instance Method Summary collapse

Instance Method Details

#camelize(string) ⇒ String

Convert an underscored string to it’s camelcase equivalent constant.



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# File 'lib/chef-api/util.rb', line 32

def camelize(string)
  string
    .to_s
    .split("_")
    .map(&:capitalize)
    .join
end

#fast_collect(collection, &block) ⇒ Array

Quickly iterate over a collection using native Ruby threads, preserving the original order of elements and being all thread-safe and stuff.

Examples:

Parse a collection of JSON files


fast_collect(Dir['**/*.json']) do |item|
  JSON.parse(File.read(item))
end



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# File 'lib/chef-api/util.rb', line 108

def fast_collect(collection, &block)
  collection.map do |item|
    Thread.new do
      Thread.current[:result] = block.call(item)
    end
  end.collect do |thread|
    thread.join
    thread[:result]
  end
end

#safe_read(path) ⇒ Array<String>

“Safely” read the contents of a file on disk, catching any permission errors or not found errors and raising a nicer exception.

Examples:

Reading a file that does not exist

safe_read('/non-existent/file') #=> Error::FileNotFound

Reading a file with improper permissions

safe_read('/bad-permissions') #=> Error::InsufficientFilePermissions

Reading a regular file

safe_read('my-file.txt') #=> ["my-file", "..."]



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# File 'lib/chef-api/util.rb', line 78

def safe_read(path)
  path     = File.expand_path(path)
  name     = File.basename(path, ".*")
  contents = File.read(path)

  [name, contents]
rescue Errno::EACCES
  raise Error::InsufficientFilePermissions.new(path: path)
rescue Errno::ENOENT
  raise Error::FileNotFound.new(path: path)
end

#truncate(string, options = {}) ⇒ Object

Truncate the given string to a certain number of characters.



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# File 'lib/chef-api/util.rb', line 48

def truncate(string, options = {})
  length = options[:length] || 30

  if string.length > length
    string[0..length - 3] + "..."
  else
    string
  end
end

#underscore(string) ⇒ String

Covert the given CaMelCaSeD string to under_score. Graciously borrowed from stackoverflow.com/questions/1509915.



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# File 'lib/chef-api/util.rb', line 14

def underscore(string)
  string
    .to_s
    .gsub(/::/, "/")
    .gsub(/([A-Z]+)([A-Z][a-z])/, '\1_\2')
    .gsub(/([a-z\d])([A-Z])/, '\1_\2')
    .tr("-", "_")
    .downcase
end