Add escoger, a terminal fuzzy selector.

default.nix was generated with cabal2nix, but modified to use GitHub as
the source since escoger isn't on Hackage.

Closes #4194

pkgs/tools/misc/escoger/default.nix

@@ -0,0 +1,33 @@
+{ cabal, dataDefault, fetchFromGitHub, HUnit, mtl, parallel
+, QuickCheck, testFramework, testFrameworkHunit
+, testFrameworkQuickcheck2, vector, vectorAlgorithms, vty
+}:
+
+let
+  rv = "b6b11c51846a9283ef4ee7c839b99ded9f6c3bc8";
+in
+cabal.mkDerivation (self: {
+  pname = "escoger";
+  version = "0.1.0.0-${rv}";
+  src = fetchFromGitHub {
+    owner = "tstat";
+    repo = "escoger";
+    rev = rv;
+    sha256 = "0n6mvg5cm50ym20bz74b7q1afkljp0fc9pxhqk0ai82a71xxbxy3";
+  };
+  isLibrary = false;
+  isExecutable = true;
+  buildDepends = [
+    dataDefault mtl parallel vector vectorAlgorithms vty
+  ];
+  testDepends = [
+    dataDefault HUnit mtl parallel QuickCheck testFramework
+    testFrameworkHunit testFrameworkQuickcheck2 vector vectorAlgorithms
+    vty
+  ];
+  meta = {
+    description = "A multithreaded terminal fuzzy selector";
+    license = self.stdenv.lib.licenses.mit;
+    platforms = self.ghc.meta.platforms;
+  };
+})

pkgs/top-level/haskell-packages.nix

@@ -3119,6 +3119,8 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
 
   commandQq = callPackage ../development/libraries/haskell/command-qq {};
 
+  escoger = callPackage ../tools/misc/escoger { };
+
   gitAnnex = callPackage ../applications/version-management/git-and-tools/git-annex {};
 
   githubBackup = callPackage ../applications/version-management/git-and-tools/github-backup {};