Add cabal-fmt

horizon.dhall

@@ -91,6 +91,7 @@ let packages =
       , bytestring-tree-builder =
           H.callHackage "bytestring-tree-builder" "0.2.7.11"
       , c2hs = H.callHackage "c2hs" "0.28.8"
+      , cabal-fmt = H.callHackage "cabal-fmt" "0.1.9"
       , cache = H.callHackage "cache" "0.1.3.0"
       , canonical-json = H.callHackage "canonical-json" "0.6.0.1"
       , casing = H.callHackage "casing" "0.1.4.1"

horizon.lock

@@ -278,6 +278,10 @@
   , mapValue =
       "6d6262823310cf14a23c4fb5e0374a16a29b0ca6f667e9d0510f17383c3951b0"
   }
+, { mapKey = "cabal-fmt"
+  , mapValue =
+      "7da8d5b11fb001d85323ae05a3b1b090b35e55f93d2ed5bba5aef3c18d711623"
+  }
 , { mapKey = "cache"
   , mapValue =
       "a49e00288043640d75f03ee1ef20218116f36561ef2573ac7321fcf6b3881105"

overlay.nix

@@ -141,6 +141,8 @@ final: prev: with pkgs.haskell.lib; {
 
   c2hs = final.callPackage (./pkgs/c2hs.nix) { };
 
+  cabal-fmt = final.callPackage (./pkgs/cabal-fmt.nix) { };
+
   cache = final.callPackage (./pkgs/cache.nix) { };
 
   canonical-json = final.callPackage (./pkgs/canonical-json.nix) { };

pkgs/cabal-fmt.nix

+{ mkDerivation, Cabal-syntax, QuickCheck, base, bytestring
+, containers, directory, filepath, integer-logarithms, lib, mtl
+, optparse-applicative, parsec, pretty, process, tasty
+, tasty-golden, tasty-hunit, tasty-quickcheck, temporary
+}:
+mkDerivation {
+  pname = "cabal-fmt";
+  version = "0.1.9";
+  sha256 = "963c57afe24e450733feb536fde3478412a3b423f748a4858504c0134ff76c01";
+  isLibrary = false;
+  isExecutable = true;
+  enableSeparateDataOutput = false;
+  libraryHaskellDepends = [
+    base bytestring Cabal-syntax containers directory filepath mtl
+    parsec pretty
+  ];
+  executableHaskellDepends = [
+    base bytestring directory filepath optparse-applicative
+  ];
+  testHaskellDepends = [
+    base bytestring Cabal-syntax containers filepath integer-logarithms
+    process QuickCheck tasty tasty-golden tasty-hunit tasty-quickcheck
+    temporary
+  ];
+  enableLibraryProfiling = true;
+  enableExecutableProfiling = true;
+  doHaddock = false;
+  jailbreak = true;
+  doCheck = false;
+  doBenchmark = false;
+  hyperlinkSource = false;
+  description = "Format .cabal files";
+  license = "GPL-3.0-or-later AND BSD-3-Clause";
+  broken = false;
+}
\ No newline at end of file