Class: TTY::Command::Truncator Private

Inherits:
Object
  • Object
show all
Defined in:
lib/tty/command/truncator.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Retains the first N bytes and the last N bytes from written content

Constant Summary collapse

DEFAULT_SIZE =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

Default maximum byte size for prefix & suffix

32 << 10

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Truncator

Create a Truncator

Parameters:

  • options (Hash) (defaults to: {})

Options Hash (options):

  • max_size (Number) 


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# File 'lib/tty/command/truncator.rb', line 18

def initialize(options = {})
  @max_size = options.fetch(:max_size) { DEFAULT_SIZE }
  @prefix   = ""
  @suffix   = ""
  @skipped  = 0
end

Instance Method Details

#read ⇒ String Also known as: to_s

Truncated representation of the content

Returns:

  • (String) 


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# File 'lib/tty/command/truncator.rb', line 57

def read
  return @prefix if @suffix.empty?

  if @skipped.zero?
    return @prefix << @suffix
  end

  @prefix + "\n... omitting #{@skipped} bytes ...\n" + @suffix
end

#write(content) ⇒ nil Also known as: <<

Write content

Parameters:

  • content (String) —

    the content to write

Returns:

  • (nil) 


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# File 'lib/tty/command/truncator.rb', line 33

def write(content)
  content = content.to_s.dup

  content, @prefix = append(content, @prefix)

  if (over = (content.bytesize - @max_size)) > 0
    content = content.byteslice(over..-1)
    @skipped += over
  end

  content, @suffix = append(content, @suffix)

  # suffix is full but we still have content to write
  while content.bytesize > 0
    content = copy(content, @suffix)
  end
end