Use GLI to create command line apps. Use Pry and ruby-debug to debug 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”