This document discusses command line applications and debugging techniques without puts statements. It recommends using helpful command line apps that avoid destructive behavior and provide full help. For command line parsing, GLI is recommended. PRY and debugger are debugging tools that allow inspecting and stepping through code without puts.

1. ZOMG: CLI and
no puts
Jesse Wolgamott
@jwo | houston.rb Meeting

2. Part 1
David
Copeland
awesome
command
line apps

3. Command Line Apps
• What makes a Command Line App?
• Follow the unix way

4. It’s not
a script

5. Kind to
Others

6. Be
Helpful

7. Two Kinds of
Command Lines

8. • Simple utility (think ls, or grep)
• Command suite (think github’s, with multiple
commands)

9. Helpful Apps
do not destroy

10. my_cmd -> nothing destructive
my_cmd -h -> full help statement
my_cmd help command -> full help for that
command

11. List of Gems

12. Gem why For?
GLI Command Suite Options
Choices or OptionParser Utility Options
Aruba Cuke Tests
Terminal-Table Format output in tables
Rainbow Color output

13. Note: Choice is probably only good for
1.8 apps
But I kinda like it
And didn’t have an OptionParser
Example

14. FREAL, look at
GLI

15. Sample Lorem
Ipsum created
using GLI
https://github.com/jwo/
Ipster/

16. Part 2
jim weirich
debugging
the safari

17. Debugging, no
puts

18. Does anyone
here debug?

19. PRY
ruby -rpry convert.rb 98.6
def index
@articles = Article.all
binding.pry
end

20. Also, there’s a
railscast!

21. PRY is good for
• Can use ls to list variables
• Can inspect variables
• Can cd into an @variable
• Inspects State.

22. How To Start
items.each do |item|
debugger #bam

23. What you can do
l #where am I
# to go to next:
n #next method
# to go into the next method
s #step into
# to evaluate ruby :
e item #evaluate item, so it'll inspect it
# display ruby expression with each step
displ # displ Item.count
•

24. Da Gems
Ruby 1.9
gem “ruby-debug19”
Ruby 1.8
gem “ruby-debug”