Add defaults stanza

Author: alexfmpe

skeleton/backend/backend.cabal

@@ -1,9 +1,21 @@
+cabal-version: 2.2
 name: backend
 version: 0.1
-cabal-version: >= 1.8
 build-type: Simple
 
+common defaults
+  default-language: Haskell2010
+  ghc-options: -Wall -O -fno-show-valid-hole-fits
+               -- unsafe code
+               -Wincomplete-record-updates -Wincomplete-uni-patterns -Wpartial-fields
+               -- unneeded code
+               -Widentities -Wredundant-constraints
+  if impl(ghc >= 8.8)
+    ghc-options:
+               -Wmissing-deriving-strategies
+
 library
+  import: defaults
   hs-source-dirs: src
   if impl(ghcjs)
     buildable: False
@@ -14,26 +26,11 @@ library
                , obelisk-route
   exposed-modules:
     Backend
-  ghc-options: -Wall -O -fno-show-valid-hole-fits
-               -- unsafe code
-               -Wincomplete-record-updates -Wincomplete-uni-patterns -Wpartial-fields
-               -- unneeded code
-               -Widentities -Wredundant-constraints
-  if impl(ghc >= 8.8)
-    ghc-options:
-               -Wmissing-deriving-strategies
 
 executable backend
+  import: defaults
   main-is: main.hs
   hs-source-dirs: src-bin
-  ghc-options: -Wall -O -fno-show-valid-hole-fits -threaded
-               -- unsafe code
-               -Wincomplete-record-updates -Wincomplete-uni-patterns -Wpartial-fields
-               -- unneeded code
-               -Widentities -Wredundant-constraints
-  if impl(ghc >= 8.8)
-    ghc-options:
-               -Wmissing-deriving-strategies
   if impl(ghcjs)
     buildable: False
   build-depends: base

skeleton/common/common.cabal

@@ -1,16 +1,10 @@
+cabal-version: 2.2
 name: common
 version: 0.1
-cabal-version: >= 1.2
 build-type: Simple
 
-library
-  hs-source-dirs: src
-  build-depends: base
-               , obelisk-route
-               , text
-  exposed-modules:
-    Common.Api
-    Common.Route
+common defaults
+  default-language: Haskell2010
   ghc-options: -Wall -O -fno-show-valid-hole-fits
                -- unsafe code
                -Wincomplete-record-updates -Wincomplete-uni-patterns -Wpartial-fields
@@ -19,3 +13,13 @@ library
   if impl(ghc >= 8.8)
     ghc-options:
                -Wmissing-deriving-strategies
+
+library
+  import: defaults
+  hs-source-dirs: src
+  build-depends: base
+               , obelisk-route
+               , text
+  exposed-modules:
+    Common.Api
+    Common.Route

skeleton/frontend/frontend.cabal

@@ -1,9 +1,21 @@
+cabal-version: 2.2
 name: frontend
 version: 0.1
-cabal-version: >= 1.8
 build-type: Simple
 
+common defaults
+  default-language: Haskell2010
+  ghc-options: -Wall -O -fno-show-valid-hole-fits
+               -- unsafe code
+               -Wincomplete-record-updates -Wincomplete-uni-patterns -Wpartial-fields
+               -- unneeded code
+               -Widentities -Wredundant-constraints
+  if impl(ghc >= 8.8)
+    ghc-options:
+               -Wmissing-deriving-strategies
+
 library
+  import: defaults
   hs-source-dirs: src
   build-depends: base
                , common
@@ -17,16 +29,9 @@ library
                , text
   exposed-modules:
     Frontend
-  ghc-options: -Wall -O -fno-show-valid-hole-fits
-               -- unsafe code
-               -Wincomplete-record-updates -Wincomplete-uni-patterns -Wpartial-fields
-               -- unneeded code
-               -Widentities -Wredundant-constraints
-  if impl(ghc >= 8.8)
-    ghc-options:
-               -Wmissing-deriving-strategies
 
 executable frontend
+  import: defaults
   main-is: main.hs
   hs-source-dirs: src-bin
   build-depends: base
@@ -35,14 +40,6 @@ executable frontend
                , obelisk-frontend
                , obelisk-route
                , reflex-dom
-  ghc-options: -Wall -O -fno-show-valid-hole-fits -threaded
-               -- unsafe code
-               -Wincomplete-record-updates -Wincomplete-uni-patterns -Wpartial-fields
-               -- unneeded code
-               -Widentities -Wredundant-constraints
-  if impl(ghc >= 8.8)
-    ghc-options:
-               -Wmissing-deriving-strategies
   if impl(ghcjs)
     ghc-options: -dedupe
     cpp-options: -DGHCJS_BROWSER