* Restructures the `cabal init` command to fix historical
  issues. All flags are preserved.
  * Codebases for interactive and non-interactive flags
    are disentangled.
  * Data structures now exploit relevant stanza structure
    and formatters only care about stanza data
  * Heuristics and prompts have a pure and impure implementation.

* Sets default behavior to be `--interactive` as opposed to
  `--non-interactive`.

* Rewrites tests to achieve 98% coverage
  * Golden files now test every stanza individually
  * Every flag is covered by a unit test
  * Interactive, simple, and non-interactive workflows are
    covered.

* Add Setup.hs for `cabal-install-solver`
* Update `cabal.project` pkg path for `cabal-install-solver`

The are various motivation points:
- I'm not aware anyone third party running Cabal tests (maybe nixpkgs?)
- No need to do gen-extra-source-files, as Cabal-tests is not distributed
- No multiple rebuilds of Cabal-QuickCheck, Cabal-tree-diff
- Slightly smaller Cabal sdist (which is quite big still)

Move Described functionality there, out of Cabal the library.
Similarly cabal-install doesn't contain Described instances,
they are only in tests.

Move Cabal instances from cabal-install TreeDiffInstances into it.
Remove defaultToExprViaShow to get better diffs and dumps

Also rename Cabal-QuickCheck (proper case), and add GenericArbitrary
module there.

... which may become a package we upload

Oleg Grenrus authored 6 years ago and Mikhail Glushenkov committed 6 years ago

Remove unix constraint from cabal.project

(cherry picked from commit 6797a9e5)

- Disable cabal-install's haddock on CI
- Temporarily disable cabal check (`-main-is` in tests)
- Remove this is not a lib note
- Tell to run git update-index --assume-unchanged

    ... when changing to -dev or -monolithic configuration.

    Run --no-assume-unchanged unconditionally, when
    changing to the production build.
- Improve auto-gen note in cabal-install.cabal
- Try to build haddock (with GHC-8.4.3 only)

Oleg Grenrus authored 7 years ago and Mikhail Glushenkov committed 7 years ago

(cherry picked from commit 9dde6816)

This script contains similar commands to appveyor.yml, except it relies
on cabal new-build, so should be safe to run locally.

Using this script can ease Travis stress.

ATM I see following tests failing:

- PackageTests/Backpack/Includes3/setup-external-ok.test.hs
    - https://github.com/haskell/cabal/issues/5039
- PackageTests/CustomPlain/setup.test.hs
    - `<command line>: cannot satisfy -package-id Cabal-2.1.0.0-inplace`
- PackageTests/CustomDep/sandbox.test.hs
    - `.../dist-sandbox-3402c05b/setup/setup: createProcess: runInteractiveProcess: exec: permission denied (Permission denied)`

Also undo a change committed by mistake.

[ci skip]

The issue is fixed now.

Should unbork the test suite.

This benchmark is based off of a script written by @kosmikus.  It adds
functionality for running multiple trials for each package, but it is currently
missing other features.

Committed by accident as part of
45fb7929.

[ci skip]

See #4462 for the gory details.

Main things about this commit:

- New 'monolithic' flag on cabal-install, which combines
  all of the tests into a single binary.  It's not very
  much code, and you don't pay for any of it on a release
  build.  I quite like it.  The one downside is that
  we can't also pull in Cabal test suites this way.

- Env vars got moved into travis-common.sh

- travis-script.sh now runs the cabal-tests tests, because
  we aren't sending enough build product over to do them
  on the second Travis run

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>