Module: Hirb::Util

Extended by:
Util
Included in:
Util
Defined in:
lib/hirb/util.rb

Overview

Group of handy utility functions used throughout Hirb.

Instance Method Summary collapse

Instance Method Details

#any_const_get(name) ⇒ Object

Returns a constant like Module#const_get no matter what namespace it’s nested in. Returns nil if the constant is not found.



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# File 'lib/hirb/util.rb', line 7

def any_const_get(name)
  return name if name.is_a?(Module)
  begin
    klass = Object
    name.split('::').each {|e|
      klass = klass.const_get(e)
    }
    klass
  rescue
     nil
  end
end

#camelize(string) ⇒ Object

From Rails ActiveSupport, converting undescored lowercase to camel uppercase.



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# File 'lib/hirb/util.rb', line 26

def camelize(string)
  string.to_s.gsub(/\/(.?)/) { "::#{$1.upcase}" }.gsub(/(?:^|_)(.)/) { $1.upcase }
end

#capture_stdout(&block) ⇒ Object

Captures STDOUT of anything run in its block and returns it as string.



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# File 'lib/hirb/util.rb', line 76

def capture_stdout(&block)
  original_stdout = $stdout
  $stdout = fake = StringIO.new
  begin
    yield
  ensure
    $stdout = original_stdout
  end
  fake.string
end

#choose_from_array(array, input, options = {}) ⇒ Object

Used by Hirb::Menu to select items from an array. Array counting starts at 1. Ranges of numbers are specified with a ‘-’ or ‘..’. Multiple ranges can be comma delimited. Anything that isn’t a valid number is ignored. All elements can be returned with a ‘*’. Examples:

1-3,5-6 -> [1,2,3,5,6]
*   -> all elements in array
''  -> []



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# File 'lib/hirb/util.rb', line 36

def choose_from_array(array, input, options={})
  options = {:splitter=>","}.merge(options)
  return array if input.strip == '*'
  result = []
  input.split(options[:splitter]).each do |e|
    if e =~ /-|\.\./
      min,max = e.split(/-|\.\./)
      slice_min = min.to_i - 1
      result.push(*array.slice(slice_min, max.to_i - min.to_i + 1))
    elsif e =~ /\s*(\d+)\s*/
      index = $1.to_i - 1
      next if index < 0
      result.push(array[index]) if array[index]
    end
  end
  result
end

#command_exists?(command) ⇒ Boolean

Determines if a shell command exists by searching for it in ENV.

Returns:

  • (Boolean) 


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# File 'lib/hirb/util.rb', line 55

def command_exists?(command)
  ENV['PATH'].split(File::PATH_SEPARATOR).any? {|d| File.exists? File.join(d, command) }
end

#detect_terminal_size ⇒ Object

Returns [width, height] of terminal when detected, nil if not detected. Think of this as a simpler version of Highline’s Highline::SystemExtensions.terminal_size()



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# File 'lib/hirb/util.rb', line 61

def detect_terminal_size
  if (ENV['COLUMNS'] =~ /^\d+$/) && (ENV['LINES'] =~ /^\d+$/)
    [ENV['COLUMNS'].to_i, ENV['LINES'].to_i]
  elsif (RUBY_PLATFORM =~ /java/ || (!STDIN.tty? && ENV['TERM'])) && command_exists?('tput')
    [`tput cols`.to_i, `tput lines`.to_i]
  elsif STDIN.tty? && command_exists?('stty')
    `stty size`.scan(/\d+/).map { |s| s.to_i }.reverse
  else
    nil
  end
rescue
  nil
end

#find_home ⇒ Object

From Rubygems, determine a user’s home.



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# File 'lib/hirb/util.rb', line 88

def find_home
  ['HOME', 'USERPROFILE'].each {|e| return ENV[e] if ENV[e] }
  return "#{ENV['HOMEDRIVE']}#{ENV['HOMEPATH']}" if ENV['HOMEDRIVE'] && ENV['HOMEPATH']
  File.expand_path("~")
rescue
  File::ALT_SEPARATOR ? "C:/" : "/"
end

#recursive_hash_merge(hash1, hash2) ⇒ Object

Recursively merge hash1 with hash2.



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# File 'lib/hirb/util.rb', line 21

def recursive_hash_merge(hash1, hash2)
  hash1.merge(hash2) {|k,o,n| (o.is_a?(Hash)) ? recursive_hash_merge(o,n) : n}
end