devShells: +vim-tw

nix/devShells/vim-tw.nix

@@ -0,0 +1,13 @@
+let
+  sources = import ../sources.nix;
+in
+  {pkgs ? import sources.pin-vim-tw {}}:
+    pkgs.mkShell {
+      name = "vim-tw";
+      packages = with pkgs; [
+        haskellPackages.cabal-fmt
+        haskellPackages.cabal-install
+        haskellPackages.ghc
+        haskellPackages.haskell-language-server
+      ];
+    }

nix/sources.json

@@ -187,6 +187,18 @@
         "url": "https://github.com/nixos/nixpkgs/archive/c58ed2fc0f592ebc280bfba077ea418ce10213d1.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
+    "pin-vim-tw": {
+        "branch": "master",
+        "description": "Nix Packages collection & NixOS",
+        "homepage": "",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "c93c1b3413bd7e235fc22b469bc0d2feec332cf5",
+        "sha256": "115sdkhyp0pm5rmag4gq0myg2rs20irisgnpf26zjfm92pw8isq4",
+        "type": "tarball",
+        "url": "https://github.com/nixos/nixpkgs/archive/c93c1b3413bd7e235fc22b469bc0d2feec332cf5.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
     "pin-wireshark": {
         "branch": "master",
         "description": "Nix Packages collection & NixOS",