Gecko [ beriskala.com ]

Name	Size	Permission	Date
cmd	[ DIR ]	drwxr-xr-x	2026-05-05 23:08
command	[ DIR ]	drwxr-xr-x	2026-05-05 23:08
debug	[ DIR ]	drwxr-xr-x	2026-05-05 23:08
ext	[ DIR ]	drwxr-xr-x	2026-05-05 23:08
helper_method	[ DIR ]	drwxr-xr-x	2026-05-05 23:08
lc	[ DIR ]	drwxr-xr-x	2026-05-05 23:08
color.rb	9.18 KB	-rw-r--r--	2026-04-07 16:51
color_printer.rb	1.29 KB	-rw-r--r--	2026-04-07 16:51
command.rb	484 B	-rw-r--r--	2026-04-07 16:51
completion.rb	14.6 KB	-rw-r--r--	2026-04-07 16:51
context.rb	21.61 KB	-rw-r--r--	2026-04-07 16:51
debug.rb	4.47 KB	-rw-r--r--	2026-04-07 16:51
default_commands.rb	7.98 KB	-rw-r--r--	2026-04-07 16:51
easter-egg.rb	4.19 KB	-rw-r--r--	2026-04-07 16:51
frame.rb	1.92 KB	-rw-r--r--	2026-04-07 16:51
help.rb	612 B	-rw-r--r--	2026-04-07 16:51
helper_method.rb	657 B	-rw-r--r--	2026-04-07 16:51
history.rb	3.15 KB	-rw-r--r--	2026-04-07 16:51
init.rb	14.64 KB	-rw-r--r--	2026-04-07 16:51
input-method.rb	14.04 KB	-rw-r--r--	2026-04-07 16:51
inspector.rb	3.99 KB	-rw-r--r--	2026-04-07 16:51
locale.rb	3.96 KB	-rw-r--r--	2026-04-07 16:51
nesting_parser.rb	8.69 KB	-rw-r--r--	2026-04-07 16:51
notifier.rb	7.18 KB	-rw-r--r--	2026-04-07 16:51
output-method.rb	2.24 KB	-rw-r--r--	2026-04-07 16:51
pager.rb	2.82 KB	-rw-r--r--	2026-04-07 16:51
ruby-lex.rb	15.94 KB	-rw-r--r--	2026-04-07 16:51
ruby_logo.aa	9.39 KB	-rw-r--r--	2026-04-07 16:51
source_finder.rb	4.22 KB	-rw-r--r--	2026-04-07 16:51
statement.rb	1.4 KB	-rw-r--r--	2026-04-07 16:51
version.rb	239 B	-rw-r--r--	2026-04-07 16:51
workspace.rb	5.37 KB	-rw-r--r--	2026-04-07 16:51
ws-for-case-2.rb	160 B	-rw-r--r--	2026-04-07 16:51
xmp.rb	3.99 KB	-rw-r--r--	2026-04-07 16:51

Rename

# frozen_string_literal: true

module IRB
  # The implementation of this class is borrowed from RDoc's lib/rdoc/ri/driver.rb.
  # Please do NOT use this class directly outside of IRB.
  class Pager
    PAGE_COMMANDS = [ENV['RI_PAGER'], ENV['PAGER'], 'less', 'more'].compact.uniq

class << self
      def page_content(content, **options)
        if content_exceeds_screen_height?(content)
          page(**options) do |io|
            io.puts content
          end
        else
          $stdout.puts content
        end
      end

def page(retain_content: false)
        if should_page? && pager = setup_pager(retain_content: retain_content)
          begin
            pid = pager.pid
            yield pager
          ensure
            pager.close
          end
        else
          yield $stdout
        end
      # When user presses Ctrl-C, IRB would raise `IRB::Abort`
      # But since Pager is implemented by running paging commands like `less` in another process with `IO.popen`,
      # the `IRB::Abort` exception only interrupts IRB's execution but doesn't affect the pager
      # So to properly terminate the pager with Ctrl-C, we need to catch `IRB::Abort` and kill the pager process
      rescue IRB::Abort
        begin
          begin
            Process.kill("TERM", pid) if pid
          rescue Errno::EINVAL
            # SIGTERM not supported (windows)
            Process.kill("KILL", pid)
          end
        rescue Errno::ESRCH
          # Pager process already terminated
        end
        nil
      rescue Errno::EPIPE
      end

private

def should_page?
        IRB.conf[:USE_PAGER] && STDIN.tty? && (ENV.key?("TERM") && ENV["TERM"] != "dumb")
      end

def content_exceeds_screen_height?(content)
        screen_height, screen_width = begin
          Reline.get_screen_size
        rescue Errno::EINVAL
          [24, 80]
        end

pageable_height = screen_height - 3 # leave some space for previous and the current prompt

# If the content has more lines than the pageable height
        content.lines.count > pageable_height ||
          # Or if the content is a few long lines
          pageable_height * screen_width < Reline::Unicode.calculate_width(content, true)
      end

def setup_pager(retain_content:)
        require 'shellwords'

PAGE_COMMANDS.each do |pager_cmd|
          cmd = Shellwords.split(pager_cmd)
          next if cmd.empty?

if cmd.first == 'less'
            cmd << '-R' unless cmd.include?('-R')
            cmd << '-X' if retain_content && !cmd.include?('-X')
          end

begin
            io = IO.popen(cmd, 'w')
          rescue
            next
          end

if $? && $?.pid == io.pid && $?.exited? # pager didn't work
            next
          end

return io
        end

nil
      end
    end
  end
end