Add prompt option for ed

Ed has the ability to have a prompt, which is nice to see when you are
in command mode. This commit lets you set one via chimera options

Change-Id: I537d686bb866bc6e996446c0251fad8bb09d3c5b
Reviewed-on: https://git.clicks.codes/c/Chimera/NixFiles/+/393
Reviewed-by: Samuel Shuert <coded@clicks.codes>
Tested-by: Skyler Grey <minion@clicks.codes>
diff --git a/modules/home/editor/ed/default.nix b/modules/home/editor/ed/default.nix
index 80e4ac6..e7b2b3c 100644
--- a/modules/home/editor/ed/default.nix
+++ b/modules/home/editor/ed/default.nix
@@ -12,13 +12,19 @@
       description = "Use Ed as the default editor";
       default = true;
     };
+    prompt = lib.mkOption {
+      type = lib.types.nullOr lib.types.str;
+      description = "What prompt should show up in command mode?";
+      default = null;
+      example = ":";
+    };
   };
 
   config = lib.mkIf config.chimera.editor.ed.enable {
     home.packages = [ pkgs.ed ];
 
     home.sessionVariables = lib.mkIf config.chimera.editor.ed.defaultEditor {
-      EDITOR = "${pkgs.ed}/bin/ed";
+      EDITOR = "${pkgs.ed}/bin/ed${if config.chimera.editor.ed.prompt != null then " -p '${config.chimera.editor.ed.prompt}'" else ""}";
     };
   };
 }