Gist::Manpage

# File lib/gist/manpage.rb, line 6
def display(name)
  puts manpage(name)
end

# File lib/gist/manpage.rb, line 42
def groff?
  system("which groff > /dev/null")
end

# File lib/gist/manpage.rb, line 49
def groff_command
  "groff -Wall -mtty-char -mandoc -Tascii"
end

# File lib/gist/manpage.rb, line 12
def manpage(name)
  return "** Can't find groff(1)" unless groff?

  require 'open3'
  out = nil
  Open3.popen3(groff_command) do |stdin, stdout, _|
    stdin.puts raw_manpage(name)
    stdin.close
    out = stdout.read.strip
  end
  out
end

# File lib/gist/manpage.rb, line 60
def page_stdout
  return unless $stdout.tty?

  read, write = IO.pipe

  if Kernel.fork
    # Parent process, become pager
    $stdin.reopen(read)
    read.close
    write.close

    # Don't page if the input is short enough
    ENV['LESS'] = 'FSRX'

    # Wait until we have input before we start the pager
    Kernel.select [STDIN]

    pager = ENV['PAGER'] || 'less -isr'
    pager = 'cat' if pager.empty?

    exec pager rescue exec "/bin/sh", "-c", pager
  else
    # Child process
    $stdout.reopen(write)
    $stderr.reopen(write) if $stderr.tty?
    read.close
    write.close
  end
end

# File lib/gist/manpage.rb, line 54
def puts(*args)
  page_stdout
  super
end

# File lib/gist/manpage.rb, line 32
def raw_manpage(name)
  if File.exists? file = File.dirname(__FILE__) + "/../../man/#{name}.1"
    File.read(file)
  else
    DATA.read.split("__CACERT__").first
  end
end