Add nvd scripts

nix-conf/home/includes/common.nix

@@ -1,4 +1,8 @@
 { config, pkgs, ... }:
+let
+  hcr = pkgs.callPackage ./scripts/hm-changes-report.nix { inherit config pkgs; };
+  scr = pkgs.callPackage ./scripts/system-changes-report.nix { inherit config pkgs; };
+in
 {
 
   imports = [
@@ -6,6 +10,9 @@
   ];
 
   home.packages = with pkgs; [
+    hcr
+    scr
+
     aspell
     aspellDicts.en
     aspellDicts.en-computers

nix-conf/home/includes/scripts/hm-changes-report.nix

@@ -0,0 +1,16 @@
+{ config, pkgs, ... }:
+
+# https://github.com/gvolpe/nix-config/blob/e28a220d0087064e6bad6b992b4914a65eb545e5/home/scripts/changes-report.nix
+let
+  #hm-profiles = "/nix/var/nix/profiles/per-user/${config.home.username}/home-manager-*-link";
+  hm-profiles = "/nix/var/nix/profiles/per-user/djm/home-manager-*-link";
+in
+pkgs.writeShellScriptBin "hm-changes-report" ''
+  # Disable nvd if there are less than 2 hm profiles.
+  if [ $(ls -d1v ${hm-profiles} 2>/dev/null | wc -l) -lt 2 ]; then
+    echo "Skipping changes report..."
+  else
+    ${pkgs.nvd}/bin/nvd diff $(ls -d1v ${hm-profiles} | tail -2)
+  fi
+''
+

nix-conf/home/includes/scripts/system-changes-report.nix

@@ -0,0 +1,15 @@
+{ config, pkgs, ... }:
+
+# https://github.com/gvolpe/nix-config/blob/e28a220d0087064e6bad6b992b4914a65eb545e5/home/scripts/changes-report.nix
+let
+  system-profiles = "/nix/var/nix/profiles/system-*-link";
+in
+pkgs.writeShellScriptBin "system-changes-report" ''
+  # Disable nvd if there are less than 2 hm profiles.
+  if [ $(ls -d1v ${system-profiles} 2>/dev/null | wc -l) -lt 2 ]; then
+    echo "Skipping changes report..."
+  else
+    ${pkgs.nvd}/bin/nvd diff $(ls -d1v ${system-profiles} | tail -2)
+  fi
+''
+