Useful additions to ~/.cabal/config

cabal.config

-- Prevent working in non-sandboxed envs:
require-sandbox: True
-- Always enable test suite installation/building
tests: True
-- Always build documentation
documentation: True
-- Run (# of CPUs) build/fetch jobs in parallel
jobs: $ncpus
-- A few more options you might want to consider:
-- library-coverage: True
-- library-profiling: True


-- Haddock (i.e. doc) settings
haddock
  -- Create a hoogle index of installed packages
  hoogle: True

  -- Hyperlink generated doc sections to source-file
  -- parts (!)  
  hyperlink-source: True

  -- You can also try to enable building docs for
  -- executables, but it is known to interact badly
  -- with `--hyperlink-source':
  --   https://github.com/haskell/cabal/issues/1919
  -- executables: True