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nix-playgraound/29-haskell-foldmap-summary/README.md

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29-haskell-foldmap-summary

This example shows intermediate Haskell aggregation with foldMap and monoids.

It includes:

  • a structured deployment event type,
  • a summary type built from monoidal fields,
  • one foldMap pass that aggregates several useful metrics, and
  • a test suite run by nix flake check.

Useful commands:

nix develop
cabal run
cabal run -- api:production:succeeded:3:platform,security worker:staging:failed-db-lock:1:ops ui:production:cancelled:2:frontend
cabal test

nix build
./result/bin/mini-summary api:production:succeeded:3:platform,security worker:staging:failed-db-lock:1:ops ui:production:cancelled:2:frontend

nix run . -- api:production:succeeded:3:platform,security worker:staging:failed-db-lock:1:ops ui:production:cancelled:2:frontend
nix flake check