@return [Array] array of sub-dependencies to avoid when choosing a

new possibility for the state we've unwound to. Only relevant for
non-primary unwinds

returns the socket type as an integer.

Addrinfo.tcp("localhost", 80).protocol == Socket::IPPROTO_TCP #=> true

Add a new protocol to the DRbProtocol module.

Add a new protocol to the DRbProtocol module.

Convert self to locale encoding

Returns true if the underlying file descriptor of ios will be closed automatically at its finalization, otherwise false.

Sets auto-close flag.

f = open("/dev/null")
IO.for_fd(f.fileno)
# ...
f.gets # may cause Errno::EBADF

f = open("/dev/null")
IO.for_fd(f.fileno).autoclose = false
# ...
f.gets # won't cause Errno::EBADF

Convert self to locale encoding

Convert self to locale encoding

Processes the topmost available {RequirementState} on the stack @return [void]

Returns the ALPN protocol string that was finally selected by the server during the handshake.

Returns the protocol string that was finally selected by the client during the handshake.

Cleans up uninstalled files and invalid gem specifications

Creates a single-row matrix where the values of that row are as given in row.

Matrix.row_vector([4,5,6])
#  => 4 5 6

Returns an array of the row vectors of the matrix. See Vector.

Sets the default proc for self to proc: (see Default Values):

h = {}
h.default_proc # => nil
h.default_proc = proc { |hash, key| "Default value for #{key}" }
h.default_proc.class # => Proc
h.default_proc = nil
h.default_proc # => nil

Specifies a Proc object proc to determine completion behavior. It should take input string and return an array of completion candidates.

The default completion is used if proc is nil.

The String that is passed to the Proc depends on the Readline.completer_word_break_characters property. By default the word under the cursor is passed to the Proc. For example, if the input is “foo bar” then only “bar” would be passed to the completion Proc.

Upon successful completion the Readline.completion_append_character will be appended to the input so the user can start working on their next argument.

Examples

Completion for a Static List

require 'readline'

LIST = [
  'search', 'download', 'open',
  'help', 'history', 'quit',
  'url', 'next', 'clear',
  'prev', 'past'
].sort

comp = proc { |s| LIST.grep(/^#{Regexp.escape(s)}/) }

Readline.completion_append_character = " "
Readline.completion_proc = comp

while line = Readline.readline('> ', true)
  p line
end

Completion For Directory Contents

require 'readline'

Readline.completion_append_character = " "
Readline.completion_proc = Proc.new do |str|
  Dir[str+'*'].grep(/^#{Regexp.escape(str)}/)
end

while line = Readline.readline('> ', true)
  p line
end

Autocomplete strategies

When working with auto-complete there are some strategies that work well. To get some ideas you can take a look at the completion.rb file for irb.

The common strategy is to take a list of possible completions and filter it down to those completions that start with the user input. In the above examples Enumerator.grep is used. The input is escaped to prevent Regexp special characters from interfering with the matching.

It may also be helpful to use the Abbrev library to generate completions.

Raises ArgumentError if proc does not respond to the call method.

Specifies a Proc object proc to determine if a character in the user’s input is escaped. It should take the user’s input and the index of the character in question as input, and return a boolean (true if the specified character is escaped).

Readline will only call this proc with characters specified in completer_quote_characters, to discover if they indicate the end of a quoted argument, or characters specified in completer_word_break_characters, to discover if they indicate a break between arguments.

If completer_quote_characters is not set, or if the user input doesn’t contain one of the completer_quote_characters or a ++ character, Readline will not attempt to use this proc at all.

Raises ArgumentError if proc does not respond to the call method.