Class: Gloo::App::Platform

Inherits:
Object
  • Object
show all
Defined in:
lib/gloo/app/platform.rb

Constant Summary collapse

DEFAULT_TMP_FILE = 
'tmp.txt'.freeze
RETURN = 
"\n".freeze
DEFAULT_LINES = 
24
DEFAULT_COLS = 
80
PAGER_CMD = 
'less -R -F -X'.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Platform

Set up Platform.



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# File 'lib/gloo/app/platform.rb', line 25

def initialize
  @prompt = Gloo::App::Prompt.new( self )
  @table = Gloo::App::Table.new( self )
end

Instance Attribute Details

#prompt ⇒ Object (readonly)

Returns the value of attribute prompt.



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# File 'lib/gloo/app/platform.rb', line 20

def prompt
  @prompt
end

#table ⇒ Object (readonly)

Returns the value of attribute table.



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# File 'lib/gloo/app/platform.rb', line 20

def table
  @table
end

Instance Method Details

#clear_screen ⇒ Object

Clear the screen.



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# File 'lib/gloo/app/platform.rb', line 56

def clear_screen
  puts "\e[H\e[2J"
end

#cols ⇒ Object

Get the number of horizontal columns on screen. Falls back to a default when stdout has no real screen behind it (piped/captured output, no controlling TTY, etc).



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# File 'lib/gloo/app/platform.rb', line 101

def cols
  _rows, columns = $stdout.winsize
  return columns
rescue StandardError
  return DEFAULT_COLS
end

#get_colorized_string(str, color) ⇒ Object

Get colorized string.



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# File 'lib/gloo/app/platform.rb', line 75

def get_colorized_string( str, color )
  colorized = ColorizedString[ str.to_s ].colorize( color )
  return colorized.to_s
end

#get_file_mech(engine) ⇒ Object

Get the file mechanism for this platform.



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# File 'lib/gloo/app/platform.rb', line 63

def get_file_mech( engine )
  return Gloo::Persist::DiscMech.new( engine )
end

#lines ⇒ Object

Sceen helpers

Get the number of vertical lines on screen. Falls back to a default when stdout has no real screen behind it (piped/captured output, no controlling TTY, etc).



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# File 'lib/gloo/app/platform.rb', line 89

def lines
  rows, _columns = $stdout.winsize
  return rows
rescue StandardError
  return DEFAULT_LINES
end

#page(msg) ⇒ Object

Show a message in a pager (less), for long content. Falls back to a plain puts when there is no real terminal to page in (piped output, captured test output, etc) or when less isn't available on the system.



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# File 'lib/gloo/app/platform.rb', line 43

def page( msg )
  return show( msg ) unless $stdout.tty?

  IO.popen( PAGER_CMD, 'w' ) { |less| less.puts msg }
rescue Errno::ENOENT
  show( msg )
rescue Errno::EPIPE
  # The user quit the pager early. Nothing more to do.
end

#show(msg) ⇒ Object

Show a message.



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# File 'lib/gloo/app/platform.rb', line 33

def show( msg )
  puts msg
end