Tanaka Akira's PrettyPrint usage? Are there any examples?

[Ed Baker]

I'm interested in using the prettyprint module available from RAA.

But, as a relatively new Rubyist, I can't seem to make sense of the included RDOCS.

Has anyone got some simple examples they could share?

 

[why the lucky stiff]

I have a brief explanation on WS&NiR (towards the bottom of the page):

http://whytheluckystiff.net/articles/2003/08/04/rubyOneEightOh

Anything in particular you want to know?

_why

 

[Ed Baker]

Without sounding incredibly stupid, I want to know how to feed it ruby code and
get back formatted output.

I sort of expected a unix like sytax. i.e. a command line like:
ruby pp.rb myfile.rb > mynewfile.rb

 

[Ed Baker]

Also, did I make a mistake in downloading the pp application from RAA?
Since it's supposed to be a builtin to v1.8. Should I have left well enough
alone?

It's like what carburetor means in French: "If it works, don't touch it"

 

[Jason Creighton]

On 4 Sep 2003 04:10:32 -0700

I'm interested in using the prettyprint module available from RAA.

But, as a relatively new Rubyist, I can't seem to make sense of the
included RDOCS.

Has anyone got some simple examples they could share?

prettyprint is now included in Ruby, at least as of 1.8. Just from
reading the commands in prettyprint.rb, it appears prettyprint is a
module for building, well, pretty printers.

I can't share any examples for prettyprint, but I can share some for
'pp', a library which builds upon prettyprint to provide nice output for
Ruby objects. For example:

require 'pp' => true
ary = Array.new(5) { |i| Array.new(5) { |j| i*j } } => [[0, 0, 0, 0, 0], [0, 1, 2, 3, 4], [0, 2, 4, 6, 8], [0, 3, 6, 9, 12], [0, 4, 8, 12, 16]]
pp ary

[[0, 0, 0, 0, 0],
[0, 1, 2, 3, 4],
[0, 2, 4, 6, 8],
[0, 3, 6, 9, 12],
[0, 4, 8, 12, 16]]
=> nil[["PWD", "/usr/lib/ruby/1.8"],
["PS1", "\\w\\$ "],
["PS2", "> "],
["XWM", "ion"]]
=> nil

....and so on. YAML can help pretty-print as well:

h = {}; 5.times { |i| h = i**4 }; puts h.to_yaml

---
0: 0
1: 1
2: 16
3: 81
4: 256
=> nil

YAML defines a 'y' method that's shorthand for puts obj.to_yaml, ie:
---
goober: lala
3.1415: PI
123: 456
=> nil

Fun stuff.

Jason Creighton

 

[why the lucky stiff]

I sort of expected a unix like sytax. i.e. a command line like:
ruby pp.rb myfile.rb > mynewfile.rb

If you run pp.rb from the commandline, the library will perform some
basic tests to ensure it is working. Oh, wait a sec. I see what you're
thinking. You're looking for something like lint, for beautifying Ruby
code.

PP is for displaying data structures in Ruby, so it won't do the trick.
Not sure what will.

_why