Results for: "OptionParser"

Creates a new handler that opens library, and returns an instance of Fiddle::Handle.

If nil is given for the library, Fiddle::Handle::DEFAULT is used, which is the equivalent to RTLD_DEFAULT. See man 3 dlopen for more.

lib = Fiddle.dlopen(nil)

The default is dependent on OS, and provide a handle for all libraries already loaded. For example, in most cases you can use this to access libc functions, or ruby functions like rb_str_new.

See Fiddle::Handle.new for more.

Generate a JSON document from the Ruby data structure obj and return it. state is * a JSON::State object,

• or a Hash like object (responding to to_hash),

• an object convertible into a hash by a to_h method,

that is used as or to configure a State object.

It defaults to a state object, that creates the shortest possible JSON text in one line, checks for circular data structures and doesn’t allow NaN, Infinity, and -Infinity.

A state hash can have the following keys:

• indent: a string used to indent levels (default: ”),

• space: a string that is put after, a : or , delimiter (default: ”),

• space_before: a string that is put before a : pair delimiter (default: ”),

• object_nl: a string that is put at the end of a JSON object (default: ”),

• array_nl: a string that is put at the end of a JSON array (default: ”),

• allow_nan: true if NaN, Infinity, and -Infinity should be generated, otherwise an exception is thrown if these values are encountered. This options defaults to false.

• max_nesting: The maximum depth of nesting allowed in the data structures from which JSON is to be generated. Disable depth checking with :max_nesting => false, it defaults to 100.

See also the fast_generate for the fastest creation method with the least amount of sanity checks, and the pretty_generate method for some defaults for pretty output.

Encodes string using Ruby’s String.encode

Convert str to to_enc. to_enc and from_enc are given as constants of Kconv or Encoding objects.

Convert str to to_enc. to_enc and from_enc are given as constants of Kconv or Encoding objects.

Returns whether input encoding is EUC-JP or not.

Note don’t expect this return value is MatchData.

Returns whether input encoding is EUC-JP or not.

Note don’t expect this return value is MatchData.

Spawns the specified command on a newly allocated pty. You can also use the alias ::getpty.

The command’s controlling tty is set to the slave device of the pty and its standard input/output/error is redirected to the slave device.

command and command_line are the full commands to run, given a String. Any additional arguments will be passed to the command.

Return values

In the non-block form this returns an array of size three, [r, w, pid].

In the block form these same values will be yielded to the block:

r

A readable IO that contains the command’s standard output and standard error

w

A writable IO that is the command’s standard input

pid

The process identifier for the command.

Spawns the specified command on a newly allocated pty. You can also use the alias ::getpty.

The command’s controlling tty is set to the slave device of the pty and its standard input/output/error is redirected to the slave device.

command and command_line are the full commands to run, given a String. Any additional arguments will be passed to the command.

Return values

In the non-block form this returns an array of size three, [r, w, pid].

In the block form these same values will be yielded to the block:

r

A readable IO that contains the command’s standard output and standard error

w

A writable IO that is the command’s standard input

pid

The process identifier for the command.

Allocates a pty (pseudo-terminal).

In the block form, yields two arguments master_io, slave_file and the value of the block is returned from open.

The IO and File are both closed after the block completes if they haven’t been already closed.

PTY.open {|master, slave|
  p master      #=> #<IO:masterpty:/dev/pts/1>
  p slave      #=> #<File:/dev/pts/1>
  p slave.path #=> "/dev/pts/1"
}

In the non-block form, returns a two element array, [master_io, slave_file].

master, slave = PTY.open
# do something with master for IO, or the slave file

The arguments in both forms are:

master_io

the master of the pty, as an IO.

slave_file

the slave of the pty, as a File. The path to the terminal device is available via slave_file.path

IO#raw! is usable to disable newline conversions:

require 'io/console'
PTY.open {|m, s|
  s.raw!
  ...
}

Specifies a File object input that is input stream for Readline.readline method.

Open the syslog facility. Raises a runtime exception if it is already open.

Can be called with or without a code block. If called with a block, the Syslog object created is passed to the block.

If the syslog is already open, raises a RuntimeError.

ident is a String which identifies the calling program.

options is the logical OR of any of the following:

LOG_CONS

If there is an error while sending to the system logger, write directly to the console instead.

LOG_NDELAY

Open the connection now, rather than waiting for the first message to be written.

LOG_NOWAIT

Don’t wait for any child processes created while logging messages. (Has no effect on Linux.)

LOG_ODELAY

Opposite of LOG_NDELAY; wait until a message is sent before opening the connection. (This is the default.)

LOG_PERROR

Print the message to stderr as well as sending it to syslog. (Not in POSIX.1-2001.)

LOG_PID

Include the current process ID with each message.

facility describes the type of program opening the syslog, and is the logical OR of any of the following which are defined for the host OS:

LOG_AUTH

Security or authorization. Deprecated, use LOG_AUTHPRIV instead.

LOG_AUTHPRIV

Security or authorization messages which should be kept private.

LOG_CONSOLE

System console message.

LOG_CRON

System task scheduler (cron or at).

LOG_DAEMON

A system daemon which has no facility value of its own.

LOG_FTP

An FTP server.

LOG_KERN

A kernel message (not sendable by user processes, so not of much use to Ruby, but listed here for completeness).

LOG_LPR

Line printer subsystem.

LOG_MAIL

Mail delivery or transport subsystem.

LOG_NEWS

Usenet news system.

LOG_NTP

Network Time Protocol server.

LOG_SECURITY

General security message.

LOG_SYSLOG

Messages generated internally by syslog.

LOG_USER

Generic user-level message.

LOG_UUCP

UUCP subsystem.

LOG_LOCAL0 to LOG_LOCAL7

Locally-defined facilities.

Example:

Syslog.open("webrick", Syslog::LOG_PID,
            Syslog::LOG_DAEMON | Syslog::LOG_LOCAL3)

Closes and then reopens the syslog.

Arguments are the same as for open().

Closes and then reopens the syslog.

Arguments are the same as for open().

Returns true if the syslog is open.

Closes the syslog facility. Raises a runtime exception if it is not open.

Calculates Adler-32 checksum for string, and returns updated value of adler. If string is omitted, it returns the Adler-32 initial value. If adler is omitted, it assumes that the initial value is given to adler.

Example usage:

require "zlib"

data = "foo"
puts "Adler32 checksum: #{Zlib.adler32(data).to_s(16)}"
#=> Adler32 checksum: 2820145

Returns true if the named file exists and has a zero size.

file_name can be an IO object.

Returns true if the named file exists and has a zero size.

file_name can be an IO object.

Returns true if the named file is a character device.

file_name can be an IO object.

Returns true if the named file has the setuid bit set.

file_name can be an IO object.

Returns true if the named file has the setgid bit set.

file_name can be an IO object.

Returns true if the named file has the sticky bit set.

file_name can be an IO object.

Returns true if the named files are identical.

file_1 and file_2 can be an IO object.

open("a", "w") {}
p File.identical?("a", "a")      #=> true
p File.identical?("a", "./a")    #=> true
File.link("a", "b")
p File.identical?("a", "b")      #=> true
File.symlink("a", "c")
p File.identical?("a", "c")      #=> true
open("d", "w") {}
p File.identical?("a", "d")      #=> false