Equivalent to File::chmod, but does not follow symbolic links (so it will change the permissions associated with the link, not the file referenced by the link). Often not available.
Changes permission bits on file to the bit pattern represented by mode_int. Actual effects are platform dependent; on Unix systems, see chmod(2) for details. Follows symbolic links. Also see File#lchmod.
f = File.new("out", "w"); f.chmod(0644) #=> 0
Creates an infinite enumerator from any block, just called over and over. The result of the previous iteration is passed to the next one. If initial is provided, it is passed to the first iteration, and becomes the first element of the enumerator; if it is not provided, the first iteration receives nil, and its result becomes the first element of the iterator.
Raising StopIteration from the block stops an iteration.
Enumerator.produce(1, &:succ) # => enumerator of 1, 2, 3, 4, .... Enumerator.produce { rand(10) } # => infinite random number sequence ancestors = Enumerator.produce(node) { |prev| node = prev.parent or raise StopIteration } enclosing_section = ancestors.find { |n| n.type == :section }
Using ::produce together with Enumerable methods like Enumerable#detect, Enumerable#slice_after, Enumerable#take_while can provide Enumerator-based alternatives for while and until cycles:
# Find next Tuesday require "date" Enumerator.produce(Date.today, &:succ).detect(&:tuesday?) # Simple lexer: require "strscan" scanner = StringScanner.new("7+38/6") PATTERN = %r{\d+|[-/+*]} Enumerator.produce { scanner.scan(PATTERN) }.slice_after { scanner.eos? }.first # => ["7", "+", "38", "/", "6"]
Sets the stream’s data mode as binary (see Data Mode).
A stream’s data mode may not be changed from binary to text.
Returns true if the stream is on binary mode, false otherwise. See Data Mode.
Sets the data mode in self to binary mode; see Data Mode.
Puts ARGF into binary mode. Once a stream is in binary mode, it cannot be reset to non-binary mode. This option has the following effects:
Newline conversion is disabled.
Encoding conversion is disabled.
Content is treated as ASCII-8BIT.
Returns true if ARGF is being read in binary mode; false otherwise. To enable binary mode use ARGF.binmode.
For example:
ARGF.binmode? #=> false ARGF.binmode ARGF.binmode? #=> true
Returns a BubbleBabble encoded version of a given string.
Changes permissions on the entries at the paths given in list (a single path or an array of paths) to the permissions given by mode; returns list if it is an array, [list] otherwise:
Modifies each entry that is a regular file using File.chmod.
Modifies each entry that is a symbolic link using File.lchmod.
Argument list or its elements should be interpretable as paths.
Argument mode may be either an integer or a string:
Integer mode: represents the permission bits to be set:
FileUtils.chmod(0755, 'src0.txt') FileUtils.chmod(0644, ['src0.txt', 'src0.dat'])
String mode: represents the permissions to be set:
The string is of the form [targets][[operator][perms[,perms]], where:
targets may be any combination of these letters:
'u': permissions apply to the file’s owner.
'g': permissions apply to users in the file’s group.
'o': permissions apply to other users not in the file’s group.
'a' (the default): permissions apply to all users.
operator may be one of these letters:
'+': adds permissions.
'-': removes permissions.
'=': sets (replaces) permissions.
perms (may be repeated, with separating commas) may be any combination of these letters:
'r': Read.
'w': Write.
'x': Execute (search, for a directory).
'X': Search (for a directories only; must be used with '+')
's': Uid or gid.
't': Sticky bit.
Examples:
FileUtils.chmod('u=wrx,go=rx', 'src1.txt') FileUtils.chmod('u=wrx,go=rx', '/usr/bin/ruby')
Keyword arguments:
noop: true - does not change permissions; returns nil.
verbose: true - prints an equivalent command:
FileUtils.chmod(0755, 'src0.txt', noop: true, verbose: true) FileUtils.chmod(0644, ['src0.txt', 'src0.dat'], noop: true, verbose: true) FileUtils.chmod('u=wrx,go=rx', 'src1.txt', noop: true, verbose: true) FileUtils.chmod('u=wrx,go=rx', '/usr/bin/ruby', noop: true, verbose: true)
Output:
chmod 755 src0.txt chmod 644 src0.txt src0.dat chmod u=wrx,go=rx src1.txt chmod u=wrx,go=rx /usr/bin/ruby
Related: FileUtils.chmod_R.
Changes permissions on the entries at the paths given in list (a single path or an array of paths) to the permissions given by mode; returns list if it is an array, [list] otherwise:
Modifies each entry that is a regular file using File.chmod.
Modifies each entry that is a symbolic link using File.lchmod.
Argument list or its elements should be interpretable as paths.
Argument mode may be either an integer or a string:
Integer mode: represents the permission bits to be set:
FileUtils.chmod(0755, 'src0.txt') FileUtils.chmod(0644, ['src0.txt', 'src0.dat'])
String mode: represents the permissions to be set:
The string is of the form [targets][[operator][perms[,perms]], where:
targets may be any combination of these letters:
'u': permissions apply to the file’s owner.
'g': permissions apply to users in the file’s group.
'o': permissions apply to other users not in the file’s group.
'a' (the default): permissions apply to all users.
operator may be one of these letters:
'+': adds permissions.
'-': removes permissions.
'=': sets (replaces) permissions.
perms (may be repeated, with separating commas) may be any combination of these letters:
'r': Read.
'w': Write.
'x': Execute (search, for a directory).
'X': Search (for a directories only; must be used with '+')
's': Uid or gid.
't': Sticky bit.
Examples:
FileUtils.chmod('u=wrx,go=rx', 'src1.txt') FileUtils.chmod('u=wrx,go=rx', '/usr/bin/ruby')
Keyword arguments:
noop: true - does not change permissions; returns nil.
verbose: true - prints an equivalent command:
FileUtils.chmod(0755, 'src0.txt', noop: true, verbose: true) FileUtils.chmod(0644, ['src0.txt', 'src0.dat'], noop: true, verbose: true) FileUtils.chmod('u=wrx,go=rx', 'src1.txt', noop: true, verbose: true) FileUtils.chmod('u=wrx,go=rx', '/usr/bin/ruby', noop: true, verbose: true)
Output:
chmod 755 src0.txt chmod 644 src0.txt src0.dat chmod u=wrx,go=rx src1.txt chmod u=wrx,go=rx /usr/bin/ruby
Related: FileUtils.chmod_R.
Like FileUtils.chmod, but changes permissions recursively.
Like FileUtils.chmod, but changes permissions recursively.
Returns time stamp of the target file if it exists and is newer than or equal to all of times.
True if the gems in the system satisfy dependency.
Returns whether the HTTP session is to be kept alive.
Add the –version option to the option parser.
Starts tracing object allocations.
Stop tracing object allocations.
Note that if ::trace_object_allocations_start is called n-times, then tracing will stop after calling ::trace_object_allocations_stop n-times.
The iterator version of the strongly_connected_components method. obj.each_strongly_connected_component is similar to obj.strongly_connected_components.each, but modification of obj during the iteration may lead to unexpected results.
each_strongly_connected_component returns nil.
class G include TSort def initialize(g) @g = g end def tsort_each_child(n, &b) @g[n].each(&b) end def tsort_each_node(&b) @g.each_key(&b) end end graph = G.new({1=>[2, 3], 2=>[4], 3=>[2, 4], 4=>[]}) graph.each_strongly_connected_component {|scc| p scc } #=> [4] # [2] # [3] # [1] graph = G.new({1=>[2], 2=>[3, 4], 3=>[2], 4=>[]}) graph.each_strongly_connected_component {|scc| p scc } #=> [4] # [2, 3] # [1]
The iterator version of the TSort.strongly_connected_components method.
The graph is represented by each_node and each_child. each_node should have call method which yields for each node in the graph. each_child should have call method which takes a node argument and yields for each child node.
g = {1=>[2, 3], 2=>[4], 3=>[2, 4], 4=>[]} each_node = lambda {|&b| g.each_key(&b) } each_child = lambda {|n, &b| g[n].each(&b) } TSort.each_strongly_connected_component(each_node, each_child) {|scc| p scc } #=> [4] # [2] # [3] # [1] g = {1=>[2], 2=>[3, 4], 3=>[2], 4=>[]} each_node = lambda {|&b| g.each_key(&b) } each_child = lambda {|n, &b| g[n].each(&b) } TSort.each_strongly_connected_component(each_node, each_child) {|scc| p scc } #=> [4] # [2, 3] # [1]
Sets the preset dictionary and returns string. This method is available just only after Zlib::Deflate.new or Zlib::ZStream#reset method was called. See zlib.h for details.
Can raise errors of Z_STREAM_ERROR if a parameter is invalid (such as NULL dictionary) or the stream state is inconsistent, Z_DATA_ERROR if the given dictionary doesn’t match the expected one (incorrect adler32 value)