Metaprogramming 2.0

on YouTube ↗48m

" summary

Scala.meta reaches a 1.0 milestone after 3K commits and exposes a platform‑independent AST plus high‑fidelity parsing that preserves comments via a first‑class tokens API. It powers a new macro model using inline + meta blocks that removes most boilerplate and enables a prototype IntelliJ expansion plugin (live expansion without recompilation). Tool successes include Codacy patterns (80+ rules) and Scala fmt, a working formatter built on tokens and layout search; early Dotty Linker rewrite‑rule experiments also integrate.

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" chapters (8)

1. 0:00Start
2. 4:52Supported functionality
3. 7:26Tokens remember all syntactic details
4. 8:35Parsing support for dialects
5. 12:08Example: the main macro
6. 13:56Don't work with tools well
7. 18:04Example: the new main macro
8. 31:50How Codacy's Scala engine works

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