This is opening talk of Ruby Tuesday Taiwan, November 25, 2008 in Taipei, Taiwan. Lukhnos talks about how Lithoglyph, his company, uses Ruby to replace shell scripts, Makefiles and Perl scripts in their build system. He also talks about the strength and weakness of Ruby the language.

1. Ruby Script at Work
Lukhnos D. Liu
Chief, Lithoglyph Inc.

2. We’re an ObjC/C++ house...

3. I love C++...

4. Templates don’t scare me

5. for (vector<pair<pair<string, size_t>, set<Node>::const_iterator> >::iterator i = lst.begin()
; i != lst.end()
; ++i)
{
// iterate the list...
if (matches((*i).first.first)) {
run((*i).second);
}
}
* modified actual code

6. C++ is fast

7. Speed
Improvement
(higher is better)
ObjC 1.0 1x
C++ gen1 5.0 5x
C++ gen2 20.0 20x
* tested on a 1 GHz PowerPC Mac

8. Can do everything

9. In OpenVanilla, We Have...
OVStringHelper::Split
OVStringHelper::Join
OVFileHelper::SlurpFile
OVUTF16::FromUTF8
OVStringHelper::StringByReplacingOccurancesOfString
WithString(src, occur, replacement)
... and more script-language perks!

10. </digress>

11. But...

12. (that’s why I’m here today!)

13. C++ needs lots of care

14. Turn-around speed is slow

15. Compliation is slooooooow

16. Bad for more than 1 tool

17. Choices: sh/Makefile/Ruby

18. Ruby is advanced

19. Clear structure

20. Easy to maintain

21. post-
processing
directives
aggregate
Data Set 1 tool
and rinse
Merged Processed
tool tool
Data Set Data Set
Data Set 4
cherry pick
Data Set 2
and rinse
Meged Separation
tool
Data Set Tool
Data Set 5
aggregate
Data Set 3
and rinse
Data Set 4 Data Set 5
Interm. merge tool
Data Set 6 conversion Data Set 7
Data Set
* actual process

22. Windows Build System
Source version- Versioned Validation and Dev Dev
Code upper Source Files Staging Packages
Mac OS X Build System
Data Set 7
* actual process

23. Ruby’s Drawbacks

24. Modules We Use
openssl
digest
uuidtools
Formosa::Mandarin (lukhnos)

25. Slow... Very slooooooow

26. String processing Performance
C++ 1 100%
Perl 0.75 75%
Ruby 0.20 20%
* estimation on daily use cases

27. Total time =
run time x frequency of run

28. Won’t deploy to users

29. Future Plans

30. My Question...

31. pair<T, T> equivalent?

32. Questions