模块 Gem::Util - rubygems: Ruby 标准库文档

correct_for_windows_path(path) 点击以切换源代码

修正 path（通常由 Windows 上的 'Gem::URI.parse().path' 返回），该路径带有前导斜杠。

# File rubygems/util.rb, line 111
def self.correct_for_windows_path(path)
  if path[0].chr == "/" && path[1].chr.match?(/[a-z]/i) && path[2].chr == ":"
    path[1..-1]
  else
    path
  end
end

glob_files_in_dir(glob, base_path) 点击以切换源代码

在 directory 内搜索匹配 pattern 的文件，返回匹配文件的绝对路径。

# File rubygems/util.rb, line 103
def self.glob_files_in_dir(glob, base_path)
  Dir.glob(glob, base: base_path).map! {|f| File.expand_path(f, base_path) }
end

gunzip(data) 点击以切换源代码

Zlib::GzipReader 包装器，用于解压缩 data。

# File rubygems/util.rb, line 12
def self.gunzip(data)
  require "zlib"
  require "stringio"
  data = StringIO.new(data, "r")

  gzip_reader = begin
                  Zlib::GzipReader.new(data)
                rescue Zlib::GzipFile::Error => e
                  raise e.class, e.inspect, e.backtrace
                end

  unzipped = gzip_reader.read
  unzipped.force_encoding Encoding::BINARY
  unzipped
end

gzip(data) 点击以切换源代码

Zlib::GzipWriter 包装器，用于压缩 data。

# File rubygems/util.rb, line 31
def self.gzip(data)
  require "zlib"
  require "stringio"
  zipped = StringIO.new(String.new, "w")
  zipped.set_encoding Encoding::BINARY

  Zlib::GzipWriter.wrap zipped do |io|
    io.write data
  end

  zipped.string
end

inflate(data) 点击以切换源代码

Zlib::Inflate#inflate 包装器

# File rubygems/util.rb, line 47
def self.inflate(data)
  require "zlib"
  Zlib::Inflate.inflate data
end

popen(*command) 点击以切换源代码

此方法调用 IO.popen 并读取结果

# File rubygems/util.rb, line 55
def self.popen(*command)
  IO.popen command, &:read
end

silent_system(*command) 点击以切换源代码

调用 system，但静默所有输出。

# File rubygems/util.rb, line 62
def self.silent_system(*command)
  opt = { out: IO::NULL, err: [:child, :out] }
  if Hash === command.last
    opt.update(command.last)
    cmds = command[0...-1]
  else
    cmds = command.dup
  end
  system(*(cmds << opt))
end

traverse_parents(directory, &block) 点击以切换源代码

枚举 directory 的父目录。

# File rubygems/util.rb, line 82
def self.traverse_parents(directory, &block)
  return enum_for __method__, directory unless block_given?

  here = File.expand_path directory
  loop do
    begin
      Dir.chdir here, &block
    rescue StandardError
      Errno::EACCES
    end

    new_here = File.expand_path("..", here)
    return if new_here == here # toplevel
    here = new_here
  end
end