Write ruby code to change ruby code

Transcript

1. Write ruby code to change ruby code Richard Huang Xinmin Labs
2. About Me Founder at Xinmin Labs Full Stack Developer Open Source Enthusiast @flyerhzm
3. Problem
4. Hey, let’s use rspec new syntax for project A Yes, sure, I love the rspec new syntax
5. Hey, let’s use rspec new syntax for project B Hmmm…ok
6. Hey, let’s use rspec new syntax for project C Oh, no, I don’t want to repeat it again
7. Developers love upgrading and refactoring code
8. Developers hate changing code again and again
9. Automation
10. Metric Tools
11. Metric Tools • cane - fails your build if code quality thresholds are not met • reek - is a tool that examines Ruby classes, modules and methods and reports any code smells it finds. • rails_best_practices - is a tool to check the quality of rails code. • ……
12. Tell you what to do, but can’t do for you
13. IDE
14. IDE • can rename class / method / variable name • can extract methods • can ……
15. IDE • can’t customize
16. Based on text
17. Based on text Replace FactoryGirl.create with create ! $ sed -i '' 's/FactoryGirl.create/create/g' spec/**/*.rb
18. Based on text Replace FactoryGirl.create with create ! !
19. Based on text Hard to be accurate ! ! ! !
20. Based on text Hard to convert complicated cases ! ! ! !
21. Based on AST
22. What’s AST AST is short for Abstract Syntax Tree
23. What’s AST
24. Why AST It is much more accurate to parse ruby code.
27. How to use AST • ripper • ParseTree - https://github.com/seattlerb/parsetree • ruby_parser - https://github.com/seattlerb/ruby_parser • parser - https://github.com/whitequark/parser
28. How to use AST
29. Example transpec - https://github.com/yujinakayama/ transpec
31. Based on AST Accurate, but hard to write and read
32. Synvert https://github.com/xinminlabs/synvert
33. Demo http://xinminlabs.github.io/synvert/
35. Synvert • Add useful attributes to AST nodes ! • Provide DSL to parse and rewrite code
36. Attributes for AST node
37. Attributes for AST node
38. Attributes for AST node
39. Attributes for AST node Check out more attributes http://xinminlabs.github.io/synvert/rules/
40. DSL • within_file / within_files • with_node / within_node • if_exist_node / unless_exist_node • append / insert / insert_after / replace_with / remove • ……
41. DSL Check out more DSL http://xinminlabs.github.io/synvert/dsl/
43. Playground http://synvert-tools.herokuapp.com/
44. Snippets https://github.com/xinminlabs/synvert-snippets
45. Want more? • Fork and send pull request • Open issues on github • Hire us to refactor your project
46. Q&A ! Thank you