How to vary jekyll's `site.title` on different pages? - jekyll

Question

I want to present a different site title in different parts of my site (identified by a path prefix). The ideal setup would look like:
_includes/header.html contains:
<a class="site-title" href="{{ site.baseurl }}/">{{ site.title }}</a>
with the header being included in page and post templates, and
_config.yml contains:
defaults:
-
scope:
path: ""
values:
title: logophile
-
scope:
path: "blog"
values:
title: (b)logophile
This however writes an empty string into the generated html.
Alternatives I've tried:
In _config.yml use site.title: logophile / site.title: (b)logophile
In _config.yml define my_site_title: logophile etc and use {{ my_site_title }} in _includes/header.html

Answer 1

Your default title will only change page.title if it's not already set. So, this will not work.
You can set default like this :
defaults:
-
scope:
path: ""
values:
alternative_site_title: logophile
-
scope:
path: "blog"
values:
alternative_site_title: (b)logophile
And call this variable like this :
<a class="site-title" href="{{ site.baseurl }}/">
{{ page.alternative_site_title }}
</a>