null-ls: add beautysh and shellcheck

flake.nix

@@ -6,6 +6,9 @@
   inputs.nmdSrc.url = "gitlab:rycee/nmd";
   inputs.nmdSrc.flake = false;
 
+  inputs.beautysh.url = "github:lovesegfault/beautysh";
+  inputs.beautysh.inputs.nixpkgs.follows = "nixpkgs";
+
   outputs = { self, nixpkgs, nmdSrc, flake-utils, ... }@inputs:
     with nixpkgs.lib;
     with builtins;
@@ -22,6 +25,7 @@
               pkgs = mkForce pkgs;
               inherit (pkgs) lib;
               helpers = import ./plugins/helpers.nix { inherit (pkgs) lib; };
+              inputs = inputs;
             };
           };
         })

plugins/null-ls/servers.nix

@@ -1,4 +1,4 @@
-{ pkgs, config, lib, ... }@args:
+{ pkgs, config, lib, inputs, ... }@args:
 let
   helpers = import ./helpers.nix args;
   serverData = {
@@ -8,6 +8,9 @@ let
       flake8 = {
         packages = [ pkgs.python3Packages.flake8 ];
       };
+      shellcheck = {
+        packages = [ pkgs.shellcheck ];
+      };
     };
     formatting = {
       phpcbf = {
@@ -25,6 +28,9 @@ let
       black = {
         packages = [ pkgs.python3Packages.black ];
       };
+      beautysh = {
+        packages = [ inputs.beautysh.packages.${pkgs.system}.beautysh-python38 ];
+      };
     };
   };
   # Format the servers to be an array of attrs like the following example

tests/flake.nix

@@ -70,6 +70,13 @@
               plugins.trouble.enable = true;
             };
 
+            beautysh = build {
+              plugins.null-ls = {
+                enable = true;
+                sources.formatting.beautysh.enable = true;
+              };
+            };
+
             issue-40 = build-stable {
               plugins = {
                 nix.enable = true;