Add tentative cabal support

Author: brendanhay

.gitignore

@@ -7,12 +7,13 @@
 *.imports
 
 # Dirs
+.direnv
+.stack-work
 bin
 dist
-vendor
-.stack-work
-.direnv
+dist-newstyle
 result
+vendor
 
 # CTAGS
 TAGS

cabal.project

@@ -0,0 +1,16 @@
+-- Writing environment files prevents reproducible builds.
+write-ghc-environment-files: never
+
+-- O1 by default. You can override this locally via:
+--   cabal configure --disable-optimization
+optimization: 1
+
+-- Local packages.
+packages:
+   examples/
+   lib/gogol/
+   lib/gogol-core/
+
+optional-packages:
+   gen/
+   lib/services/*/

flake.nix

@@ -104,6 +104,7 @@
           nativeBuildInputs = [
             # Tools specific to the GHC version.
             ghc
+            haskellPackages.cabal-install
             haskellPackages.haskell-language-server
 
             # The stack wrapper that uses the shell's GHC version.