Real craftsmen (can) create their own tools, parts 1 & 2
summary
Covers concrete tooling: explains the abc metric implementation in flog, the structural-duplication algorithm in flay, and the use of ruby parser plus sexp_processor to build AST walkers. Shows a tiny lint built with seven tests and ~50 lines of code that flags single-letter and CamelCase variables, demonstrating how fast a useful analyzer gets usable. Mentions hooking flay for refactor hints and admits codeclimate-level polish takes hundreds of hours, and even includes a quick hot sauce recipe as an aside.
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