Transcript of editing session using ex

README.adoc

What is this?

A transcript of an editing session using ex.

ex?

If you’ve used Vim or vi, any time you type a command starting with “:”, you’re writing an ex command. ex is the command-line only editor, and vi was originally written to provide better editing on non-dumb terminals.

Why use ex?

This is an exercise in what editing used to be like before the advent of vi. Basically, a retro computing exercise. ex is also easily scriptable from the command line; I’ve used it in git hooks.

What program did you write?

This is a Ruby implementation of sha256sum (generation only). It appears to work correctly.

transcript

vauxhall ok % ex -s hash.rb
i
#!/usr/bin/ruby

require 'digest'

def main(args)
.	
:echo &ts
echo &ts
set   
  helplang=es  modified  fileencodings=ucs-bom,utf-8,default,latin1
a
  fp = args.map { |f| File.new(f, 'r') }
  fp = [$stdin] if fp.empty?
.   
%p
#!/usr/bin/ruby
 
require 'digest'
 
def main(args)
  fp = args.map { |f| File.new(f, 'r') }
  fp = [$stdin] if fp.empty?
a
.               
p
  fp = [$stdin] if fp.empty?
-1
p
  fp = args.map { |f| File.new(f, 'r') }
.,.+1c
  fp = args.map { |f| [f, File.new(f, 'r')] }
  fp = [['-', $stdin]] if fp.empty?
.
%p
#!/usr/bin/ruby
 
require 'digest'
 
def main(args)
  fp = args.map { |f| [f, File.new(f, 'r')] }
  fp = [['-', $stdin]] if fp.empty?
a
  fp.each do |(name, io)|
    d = Digest::SHA256.new
    io.each { |l| d << l }
    puts d.hexdigest + "  " + name
  end
end
.
%p
#!/usr/bin/ruby
 
require 'digest'
 
def main(args)
  fp = args.map { |f| [f, File.new(f, 'r')] }
  fp = [['-', $stdin]] if fp.empty?
  fp.each do |(name, io)|
    d = Digest::SHA256.new
    io.each { |l| d << l }
    puts d.hexdigest + "  " + name
  end
end
a

main(ARGV) if __FILE__ == $PROGRAM_NAME
.
%p
#!/usr/bin/ruby
 
require 'digest'
 
def main(args)
  fp = args.map { |f| [f, File.new(f, 'r')] }
  fp = [['-', $stdin]] if fp.empty?
  fp.each do |(name, io)|
    d = Digest::SHA256.new
    io.each { |l| d << l }
    puts d.hexdigest + "  " + name
  end
end
 
main(ARGV) if __FILE__ == $PROGRAM_NAME
w
q