neomutt: add some options

Superficially, allow source primary account by default and show
default mailbox.

modules/programs/neomutt-accounts.nix

@@ -76,6 +76,12 @@ in {
       '';
     };
 
+    showDefaultMailbox = mkOption {
+      type = types.bool;
+      default = true;
+      description = "Show the default mailbox (INBOX)";
+    };
+
     mailboxName = mkOption {
       type = types.nullOr types.str;
       default = null;

modules/programs/neomutt.nix

@@ -235,7 +235,8 @@ let
         account.neomutt.extraMailboxes;
     in with account; ''
       # register account ${name}
-      ${mailboxes} "${mailroot}/${folders.inbox}"
+      ${optionalString account.neomutt.showDefaultMailbox
+      ''${mailboxes} "${mailroot}/${folders.inbox}"''}
       ${extraMailboxes}
       ${hookName} ${mailroot}/ " \
           source ${accountFilename account} "
@@ -402,6 +403,11 @@ in {
           default = true;
         };
 
+      sourcePrimaryAccount =
+        mkEnableOption "source the primary account by default" // {
+          default = true;
+        };
+
       unmailboxes = mkOption {
         type = types.bool;
         default = false;
@@ -467,8 +473,9 @@ in {
           ''
         }${concatMapStringsSep "\n" registerAccount neomuttAccounts}
 
-        # Source primary account
-        source ${accountFilename primary}
+        ${optionalString cfg.sourcePrimaryAccount ''
+          # Source primary account
+          source ${accountFilename primary}''}
 
         # Extra configuration
         ${optionsStr cfg.settings}