Build a Cross-Platform Web API CLI in 15 minutes with Mruby-CLI

Thanks to web APIs, we can extend any web apps with simple Ruby CLI: listing open pull requests, or tweeting directly from the terminal.

Unfortunately, distributing Ruby CLIs is complicated. So many runtimes to support, so hard to guarantee compatibility of gems on every platforms.

With mruby-cli, you can easily build an API CLI in mruby, a Ruby sibbling, and distribute it for every major platforms.

In this talk, we'll show how quickly you can build and distribute a such CLI with mruby-cli.

GitHub Repository:
- mruby-cli https://github.com/hone/mruby-cli
- mruby-web_api https://travis-ci.org/toch/mruby-web_api
- github_status https://github.com/toch/github_status

Screencasts of the live coding made during the talk https://gfycat.com/tochgif/rubyconf_ph_2016

Transcript

1. Building a cross-platform API CLI in 15 minutes
2. toch _toch Magandang araw! Ako si Christophe.
5. Google Trend of the keywords Web API
8. GitHub -> Hub Heroku -> Heroku Toolbelt AWS -> aws-cli Trello -> trello_cli Slack -> slack-cli ...
10. Cross Toolchain?
11. Cross Toolchain? ¯\_(ツ)_/¯
13. (╯°□°）╯︵ ┻━┻ ┬──┬
21. $ gem install heroku
25. $ GOOS=linux GOARCH=amd64 go build $ GOOS=windows GOARCH=amd64 go build $ GOOS=darwin GOARCH=amd64 go build
28. We shouldn't stop there!
29. + = https://github.com/hone/mruby-cli mruby-cli
30. → Ruby → Performance → No Require → Binary for each platform/arch → Simple to compile & release → CLI apps framework Mruby-cli talk at RubyKaigi 2015 Goals
31. Team
33. → ISO/IEC 30170:2012 standard → Compatible with Ruby 2.1 core API → No Built-in File/Socket/IO → not threadsafe, no Thread → procs/blocks → metaprogramming → monkey patching → literals → easy to bind to C-ABI compatible lib
34. Gotchas: → no stdlib → native ext have to support cross- compilation → no Rubygems, but mrbgems-list
38. Safe Live Coding: Hello RubyConf Ph
39. Safe Live Coding: Advanced Scaffold
40. A real example: ~/my_repo/ $ github_status Success
41. GitHub Repository: $ git config --get remote.origin.url git@github.com:toch/my_repo.git
42. Current Branch Name: $ git symbolic-ref HEAD refs/heads/current_branch
43. Corresponding Pull Request: GET /repos/toch/my_repo/pulls ?head=toch:current_branch
44. GitHub Status GET /repos/toch/my_repo /commits/<sha_head>/status
45. Safe Live Coding: GitHub Status
46. Let's build CLI in Ruby <3! toch _toch hone/mruby-cli toch/mruby-web_api toch/github_status