class Dir

Overview

Objects of class Dir are directory streams representing directories in the underlying file system. They provide a variety of ways to list directories and their contents.

The directory used in these examples contains the two regular files (config.h and main.rb), the parent directory (..), and the directory itself (.).

See also: File.

Included Modules

Defined in:

dir.cr
dir/glob.cr

Constructors

Class Method Summary

Instance Method Summary

Instance methods inherited from module Iterable(String)

chunk(reuse = false, &block : T -> U) forall U chunk, cycle(n)
cycle
cycle
, each each, each_cons(count : Int, reuse = false) each_cons, each_slice(count : Int, reuse = false) each_slice, each_with_index(offset = 0) each_with_index, each_with_object(obj) each_with_object

Instance methods inherited from module Enumerable(String)

all?(&block)
all?
all?
, any?(&block)
any?
any?
, chunks(&block : T -> U) forall U chunks, compact_map(&block) compact_map, count(&block)
count(item)
count
, cycle(n, &block)
cycle(&block)
cycle
, each(&block : T -> _) each, each_cons(count : Int, reuse = false, &block) each_cons, each_slice(count : Int, reuse = false, &block) each_slice, each_with_index(offset = 0, &block) each_with_index, each_with_object(obj, &block) each_with_object, find(if_none = nil, &block) find, first(count : Int)
first
first
, first? first?, flat_map(&block : T -> Array(U) | Iterator(U) | U) forall U flat_map, grep(pattern) grep, group_by(&block : T -> U) forall U group_by, in_groups_of(size : Int, filled_up_with : U = nil) forall U
in_groups_of(size : Int, filled_up_with : U = nil, reuse = false, &block) forall U
in_groups_of
, includes?(obj) includes?, index(&block)
index(obj)
index
, index_by(&block : T -> U) forall U index_by, join(separator, io)
join(separator = "")
join(separator, io, &block)
join(separator = "", &block)
join
, map(&block : T -> U) forall U map, map_with_index(&block : T, Int32 -> U) forall U map_with_index, max max, max? max?, max_by(&block : T -> U) forall U max_by, max_by?(&block : T -> U) forall U max_by?, max_of(&block : T -> U) forall U max_of, max_of?(&block : T -> U) forall U max_of?, min min, min? min?, min_by(&block : T -> U) forall U min_by, min_by?(&block : T -> U) forall U min_by?, min_of(&block : T -> U) forall U min_of, min_of?(&block : T -> U) forall U min_of?, minmax minmax, minmax? minmax?, minmax_by(&block : T -> U) forall U minmax_by, minmax_by?(&block : T -> U) forall U minmax_by?, minmax_of(&block : T -> U) forall U minmax_of, minmax_of?(&block : T -> U) forall U minmax_of?, none?(&block)
none?
none?
, one?(&block) one?, partition(&block) partition, product(&block)
product(initial : Number, &block)
product
product(initial : Number)
product
, reduce(&block)
reduce(memo, &block)
reduce
, reject(&block : T -> ) reject, select(&block : T -> ) select, size size, skip(count : Int) skip, skip_while(&block) skip_while, sum(initial)
sum
sum(initial, &block)
sum(&block)
sum
, take_while(&block) take_while, to_a to_a, to_h to_h, to_set to_set

Instance methods inherited from class Reference

==(other : self)
==(other)
==
, dup dup, hash hash, inspect(io : IO) : Nil inspect, object_id : UInt64 object_id, pretty_print(pp) : Nil pretty_print, same?(other : Reference)
same?(other : Nil)
same?
, to_s(io : IO) : Nil to_s

Constructor methods inherited from class Reference

new new

Instance methods inherited from class Object

!=(other) !=, !~(other) !~, ==(other) ==, ===(other : JSON::Any)
===(other : YAML::Any)
===(other)
===
, =~(other) =~, class class, dup dup, hash hash, inspect(io : IO)
inspect
inspect
, itself itself, not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, tap(&block) tap, to_json(io : IO)
to_json
to_json
, to_pretty_json(indent : String = " ")
to_pretty_json(io : IO, indent : String = " ")
to_pretty_json
, to_s
to_s(io : IO)
to_s
, to_yaml(io : IO)
to_yaml
to_yaml
, try(&block) try, unsafe_as(type : T.class) forall T unsafe_as

Constructor methods inherited from class Object

from_json(string_or_io, root : String) : self
from_json(string_or_io) : self
from_json
, from_yaml(string_or_io) : self from_yaml

Constructor Detail

def self.new(path) #

Returns a new directory object for the named directory.


[View source]
def self.open(path) : self #

Alias for new(path)


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Class Method Detail

def self.[](*patterns) : Array(String) #

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def self.[](patterns : Enumerable(String)) : Array(String) #

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def self.cd(path) #

Changes the current working directory of the process to the given string.


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def self.cd(path, &block) #

Changes the current working directory of the process to the given string and invokes the block, restoring the original working directory when the block exits.


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def self.children(dirname) : Array(String) #

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def self.current : String #

Returns the current working directory.


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def self.each_child(dirname, &block) #

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def self.each_entry(dirname, &block) #

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def self.empty?(path) : Bool #

Returns true if the directory at path is empty, otherwise returns false. Raises Errno if the directory at path does not exist.

Dir.mkdir("bar")
Dir.empty?("bar") # => true
File.write("bar/a_file", "The content")
Dir.empty?("bar") # => false

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def self.entries(dirname) : Array(String) #

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def self.exists?(path) : Bool #

Returns true if the given path exists and is a directory


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def self.glob(patterns : Enumerable(String), &block) #

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def self.glob(*patterns) : Array(String) #

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def self.glob(patterns : Enumerable(String)) : Array(String) #

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def self.glob(*patterns, &block) #

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def self.mkdir(path, mode = 511) #

Creates a new directory at the given path. The linux-style permission mode can be specified, with a default of 777 (0o777).


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def self.mkdir_p(path, mode = 511) #

Creates a new directory at the given path, including any non-existing intermediate directories. The linux-style permission mode can be specified, with a default of 777 (0o777).


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def self.open(path, &block) #

Opens a directory and yields it, closing it at the end of the block. Returns the value of the block.


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def self.rmdir(path) #

Removes the directory at the given path.


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Instance Method Detail

def children : Array(String) #

Returns an array containing all of the filenames except for . and .. in the given directory.


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def close #

Closes the directory stream.


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def each_child(&block) : Nil #

Calls the block once for each entry except for . and .. in this directory, passing the filename of each entry as a parameter to the block.

Dir.mkdir("testdir")
File.write("testdir/config.h", "")

d = Dir.new("testdir")
d.each_entry { |x| puts "Got #{x}" }

produces:

Got config.h

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def each_child #

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def each_entry(&block) : Nil #

Calls the block once for each entry in this directory, passing the filename of each entry as a parameter to the block.

Dir.mkdir("testdir")
File.write("testdir/config.h", "")

d = Dir.new("testdir")
d.each_entry { |x| puts "Got #{x}" }

produces:

Got .
Got ..
Got config.h

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def each_entry #

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def entries : Array(String) #

Returns an array containing all of the filenames in the given directory.


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def inspect(io) #

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def path : String #

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def pretty_print(pp) #

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def read #

Reads the next entry from dir and returns it as a string. Returns nil at the end of the stream.

d = Dir.new("testdir")
array = [] of String
while file = d.read
  array << file
end
array.sort # => [".", "..", "config.h"]

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def rewind #

Repositions this directory to the first entry.


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def to_s(io) #

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