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Versions: 16
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Contents
class Pry::Pager
# @param [String] text
# A piece of text to run through a pager.
# @param [Symbol?] pager
# `:simple` -- Use the pure ruby pager.
# `:system` -- Use the system pager (less) or the environment variable
# $PAGER if set.
# `nil` -- Infer what pager to use from the environment. What this
# really means is that JRuby and systems that do not have
# access to 'less' will run through the pure ruby pager.
def self.page(text, pager = nil)
case pager
when nil
no_pager = !SystemPager.available?
is_jruby = defined?(RUBY_ENGINE) && RUBY_ENGINE == "jruby"
(is_jruby || no_pager) ? SimplePager.new(text).page : SystemPager.new(text).page
when :simple
SimplePager.new(text).page
when :system
SystemPager.new(text).page
else
raise "'#{pager}' is not a recognized pager."
end
end
def self.page_size
27
end
def initialize(text)
@text = text
end
class SimplePager < Pry::Pager
def page
text_array = @text.lines.to_a
text_array.each_slice(Pry::Pager.page_size) do |chunk|
puts chunk.join
break if chunk.size < Pry::Pager.page_size
if text_array.size > Pry::Pager.page_size
puts "\n<page break> --- Press enter to continue ( q<enter> to break ) --- <page break>"
break if $stdin.gets.chomp == "q"
end
end
end
end
class SystemPager < Pry::Pager
def self.default_pager
ENV["PAGER"] || "less -R -S -F -X"
end
def self.available?
pager_executable = default_pager.split(' ').first
`which #{ pager_executable }`
rescue
end
def initialize(*)
super
@pager = SystemPager.default_pager
end
def page
IO.popen(@pager, 'w') do |io|
io.write @text
end
end
end
end
Version data entries
16 entries across 16 versions & 1 rubygems