Local override for configuration...

Look for a local .yml file and apply it if present.

.gitignore

@@ -0,0 +1 @@
+local-override.yml

lib/MyApp.pm

@@ -75,6 +75,10 @@ sub startup ($self) {
    # Set a "secret" for signing cookies, preventing "Your secret
    # passphrase needs to be changed" in the log, using my_app.yml.
    my $config = $self->plugin('NotYAMLConfig');
+   # Apply local overrides, if any.
+   if (-e $self->home->child('local-override.yml')) {
+      $config = $self->plugin('NotYAMLConfig', { file => 'local-override.yml' });
+   }
    $self->secrets([ $config->{secrets} ]);
 
    # Add home-made helper(s).

my_app.yml

@@ -3,3 +3,9 @@ secrets:
   - 197b9b0060f3285c0909d83598e54f9ec0602151
 default-rows-per-page: 12
 maximum-rows-per-page: 100
+
+# Copy these to local-override.yml, uncomment and set to your liking,
+# then the about page will invite email.
+#email-address: webmaster@example.com?Subject=Awesome site!
+#email-name: webmaster@example.com
+

templates/book/about.html.ep

@@ -43,9 +43,11 @@ or "Name like" on the authors page).  Other non-authors are
 "Anonymous" and "Unknown".
 </p>
 
+% if (config->{'email-address'}) {
 <p>
-Comments and questions welcome
-at <a href="mailto:barnold@tilde.club?Subject=Awesome%20project!">barnold@tilde.club</a>.
+Comments and questions are welcome at
+<a href="mailto:<%= config->{'email-address'} %>"><%= config->{'email-name'} %></a>.
 </p>
+% }
 
 </div>