Class: Warg::Console

Inherits:
Object
  • Object
show all
Defined in:
lib/warg.rb

Defined Under Namespace

Classes: Content, CursorPosition, History, HostStatus, IOProxy, SelectGraphicRendition

Class Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Console

Returns a new instance of Console.



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# File 'lib/warg.rb', line 75

def initialize
  @io = $stderr
  @history = History.new
  @cursor_position = CursorPosition.new
  @io_mutex = Mutex.new
  @history_mutex = Mutex.new
end

Class Attribute Details

.hostname_width ⇒ Object

Returns the value of attribute hostname_width.



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# File 'lib/warg.rb', line 68

def hostname_width
  @hostname_width
end

Class Method Details

.SGR(text) ⇒ Object 



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# File 'lib/warg.rb', line 71

def self.SGR(text)
  SelectGraphicRendition::Renderer.new(text)
end

Instance Method Details

#append_to_history(content) ⇒ Object 



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# File 'lib/warg.rb', line 124

def append_to_history(content)
  @history_mutex.synchronize do
    @history.append(content, at: @cursor_position)
    @cursor_position.adjust_to(content)
  end
end

#print(text_or_content = nil) ⇒ Object 



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# File 'lib/warg.rb', line 103

def print(text_or_content = nil)
  print_content(text_or_content)
end

#print_content(text_or_content) ⇒ Object 



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# File 'lib/warg.rb', line 107

def print_content(text_or_content)
  content = case text_or_content
            when Content, HostStatus
              text_or_content
            else
              Content.new(text_or_content, self)
            end

  @io_mutex.synchronize do
    @io.print content.to_s

    append_to_history(content)

    content
  end
end

#puts(text_or_content = nil) ⇒ Object 



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# File 'lib/warg.rb', line 93

def puts(text_or_content = nil)
  content = print_content text_or_content

  unless text_or_content.to_s.end_with?("\n")
    print_content "\n"
  end

  content
end

#redirecting_stdout_and_stderr ⇒ Object 



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# File 'lib/warg.rb', line 83

def redirecting_stdout_and_stderr
  $stdout = IOProxy.new($stdout, self)
  $stderr = IOProxy.new($stderr, self)

  yield
ensure
  $stdout = $stdout.__getobj__
  $stderr = $stderr.__getobj__
end

#reprint_content(content) ⇒ Object

For CSI sequences, see: en.wikipedia.org/wiki/ANSI_escape_code#Terminal_output_sequences



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# File 'lib/warg.rb', line 133

def reprint_content(content)
  @io_mutex.lock

  history_entry = @history.find_entry_for(content)

  rows_from_cursor_row_to_content_start = @cursor_position.row - history_entry.row_number

  # starting from the current line, clear the line and move up a line
  #
  # this will bring us to the line the content we're reprinting, clearing all lines beneath
  # it
  rows_from_cursor_row_to_content_start.times do
    # clear the current line
    @io.print "\e[2K"

    # move up a line
    @io.print "\e[1A"
  end

  # go to the column of the content
  @io.print "\e[#{history_entry.column_number}G"

  # clear from the starting column of the content to the end of the line
  @io.print "\e[0K"

  # re-print the content from its original location
  @io.print content.to_s

  # initialize how much we'll be adjusting the column number by
  column_adjustment = history_entry.end_column

  current_entry = history_entry

  until current_entry.next_entry.nil?
    next_entry = current_entry.next_entry

    # we only update the column of subsequent entries if they were on the same line as the
    # entry being reprinted.
    if next_entry.row_number == history_entry.end_row
      next_entry.column_number = column_adjustment
      column_adjustment += next_entry.last_line_length
    end

    # update the next entry's row number by how many rows the updated entry grew or shrank
    next_entry.row_number += history_entry.newline_count_diff

    # print the content
    @io.print next_entry.to_s

    # get the next entry to repeat
    current_entry = next_entry
  end

  # Update the cursor position by how many row's the new content has changed and the new
  # end column of the last entry in the history
  @cursor_position.column = current_entry.end_column
  @cursor_position.row += history_entry.newline_count_diff

  # reset `newline_count` and `last_line_length` to what they now are in `@content`
  history_entry.sync!

  @io_mutex.unlock
end