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# coding: utf-8
class Pry::Terminal
class << self
# Return a pair of [rows, columns] which gives the size of the window.
#
# If the window size cannot be determined, return nil.
def screen_size
rows, cols = actual_screen_size
if rows.to_i != 0 && cols.to_i != 0
[rows.to_i, cols.to_i]
else
nil
end
end
# Return a screen size or a default if that fails.
def size! default = [27, 80]
screen_size || default
end
# Return a screen width or the default if that fails.
def width!
size![1]
end
# Return a screen height or the default if that fails.
def height!
size![0]
end
def actual_screen_size
# The best way, if possible (requires non-jruby ≥1.9 or io-console gem)
screen_size_according_to_io_console ||
# Fall back to the old standby, though it might be stale:
screen_size_according_to_env ||
# Fall further back, though this one is also out of date without something
# calling Readline.set_screen_size
screen_size_according_to_readline ||
# Windows users can otherwise run ansicon and get a decent answer:
screen_size_according_to_ansicon_env
end
def screen_size_according_to_io_console
return if Pry::Helpers::Platform.jruby?
begin
require 'io/console'
begin
if $stdout.respond_to?(:tty?) && $stdout.tty? && $stdout.respond_to?(:winsize)
$stdout.winsize
end
rescue Errno::EOPNOTSUPP
# $stdout is probably a socket, which doesn't support #winsize.
end
rescue LoadError
# They probably don't have the io/console stdlib or the io-console gem.
# We'll keep trying.
end
end
def screen_size_according_to_env
size = [ENV['LINES'] || ENV['ROWS'], ENV['COLUMNS']]
size if nonzero_column?(size)
end
def screen_size_according_to_readline
if defined?(Readline) && Readline.respond_to?(:get_screen_size)
size = Readline.get_screen_size
size if nonzero_column?(size)
end
rescue Java::JavaLang::NullPointerException
# This rescue won't happen on jrubies later than:
# https://github.com/jruby/jruby/pull/436
nil
end
def screen_size_according_to_ansicon_env
return unless ENV['ANSICON'] =~ /\((.*)x(.*)\)/
size = [$2, $1]
size if nonzero_column?(size)
end
private
def nonzero_column?(size)
size[1].to_i > 0
end
end
end
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