Migrate packages

pkgs/edit-config/default.nix

@@ -0,0 +1,34 @@
+{
+  writeShellApplication,
+  fd,
+  fzf,
+}:
+writeShellApplication {
+  name = "edit-config";
+
+  runtimeInputs = [
+    fd
+    fzf
+  ];
+
+  text = ''
+    if [[ $# == 0 ]]; then
+       QUERY=""
+    else
+       QUERY="$1"
+    fi
+
+    FILE=$(fd -H -t f . ~/.dotfiles | fzf --query "$QUERY")
+    if [[ "$FILE" != "" ]]; then
+      $EDITOR "$FILE"
+    else
+      exit 1
+    fi
+
+    read -rp 'Run "home-manager switch"? [Yn]: ' yn
+    case $yn in
+        Y | y | Yes | yes | "" ) home-manager switch;;
+        * ) echo "Not switching home-manager configuration";;
+    esac
+  '';
+}