こんにちは

• Ruby で作った自作コマンドの紹介です
• Perl の話ありません！すいません！！

自己紹介

• @yuya_takeyama
• KENT WEB というサイトで配布されていた Perl 製 CGI スクリプトの改造がプログラミングとの出会いでした
• Bulknews に憧れて ReadMe! Japan の RSS を配信するサイトとかやってました
• 赤坂で PHP 書いてます
• 9 月から京橋で Ruby とか書いてると思います

jq: commandline JSON processor

• sed/awk/grep for JSON
• Written in C

jq: commandline JSON processor

jr: jq alternative tool for Rubyists

• sed/awk/grep for JSON
• Inspired by jq
• Written in Ruby

jr: jq alternative tool for Rubyists

Why I created jr?

• jq is great, and I'm lovin' it!
• But it's bit paiful to performe complex aggregation.
• Because it requires to understand jq specific syntax.
• It's like JavaScript, but it's not JavaScript.
• I want to write in Ruby!!!

Writing jr filters

• Receive stream of JSONs
• Transform it using method-chaining
• Methods of Enumerable are very helpful

Pros

• Great power of Ruby!
• Huge assets of further Rubygems!
• No additional knowledge required (for Rubyists)
• Hackable (Just a 116 lines of Ruby code at Ver. 0.2.0)

Cons

• Bit redundant for easy task.
• Installation of Ruby is required.

At the end

• Mr. Wall, Miyagawa-san, thank you for a wonderful encounter with programming (And KENT-san of KENT Web too)
• Matsumoto-san, thank you for great power of Ruby
• @stedolan, the creator of jq, thank you for the inspiration
• Staffs of YAPC, thank you for great conference!

Thank you for watching :)