Make emacsclient work like it should

em.rb

#!/usr/bin/env ruby

# Violet Baddley
# 2017
#
# Install in your favorite PATH directory as `em`
# chmod a+x
#
# usage: em [emacsclient options] [file...]
#        whatever | em [emacsclient options]
#
# Writes the piped command output (if given) to a temp file
# and then launches `emacsclient -t` with your arguments.

require 'tempfile'



def pipe_stdin_to tempf
  loop do
    file_segment = $stdin.readpartial(4096)
    tempf.write file_segment
    tempf.flush
  end
rescue EOFError => e
  # fucking finally.
end



if $stdin.tty?
  em_pid = spawn('/usr/local/bin/emacsclient', '-t', *ARGV)
  Process.wait em_pid

else
  tempfile = Tempfile.new 'emacs-stdin'
  tempfile.set_encoding 'ASCII-8BIT', 'ASCII-8BIT'
  $stdin.set_encoding 'ASCII-8BIT'

  begin
    pipe_stdin_to tempfile

    em_pid = spawn('/usr/local/bin/emacsclient', '-t', *ARGV, tempfile.path)
    Process.wait em_pid

  ensure
    tempfile.close
    tempfile.unlink
  end

end