Create research project page template

* People may be assigned to multiple research projects.
* Plugin for advanced filter expressions (see also
  https://github.com/jekyll/jekyll/pull/4478)

_includes/person-card.html

+<div class="col-sm-4 col-md-4 card card-block text-xs-center people">
+  <a href="{{ person.url }}">
+    <img class="img-circle" style="width: 75%" src="{{ person.image | prepend: site.baseurl }}" alt="Photo of {{ person.firstname }} {{ person.lastname }}" />
+    <h4 class="card-title">{{ person.firstname }} {{ person.lastname }}</h4>
+  </a>
+  <h6 class="card-subtitle text-muted">{{ person.position }}</h6>
+</div>

_layouts/research.html

+---
+layout: page
+---
+{{ content }}
+
+{% assign people = site.people | where_exp: "person", "person.projects contains page.project_id" %}
+{% if people.size > 0 %}
+<h3>People</h3>
+<div class="row">
+{% for person in people %}{% include person-card.html %}{% endfor %}
+</div>
+{% endif %}
+
+<h3>Recent Publications</h3>
+
+{% bibliography -q @*[project ~= {{page.project_id}}] --max 10 %}

_people/da-rocha-pinto.md

@@ -6,6 +6,8 @@ position: PhD Student
 webpage: http://www.doc.ic.ac.uk/~pmd09/
 email: pmd09@doc.ic.ac.uk
 github: pedromdrp
+projects:
+  - concurrency
 ---
 Pedro da Rocha Pinto is a PhD student at the [Department of Computing](http://www.doc.ic.ac.uk) at
 Imperial. His research focusses on developing logics for verification of fine-grained concurrent programs.

_people/gardner.md

@@ -5,6 +5,8 @@ image: /images/gardner.jpg
 position: Professor, Group Leader
 webpage: http://www.doc.ic.ac.uk/~pg/
 email: pg@doc.ic.ac.uk
+projects:
+  - concurrency
 ---
 Philippa Gardner is a professor in the [Department of Computing](http://www.doc.ic.ac.uk) at
 Imperial. Her current research focusses on program verification: in

_people/ntzik.md

@@ -6,5 +6,7 @@ position: PhD Student
 webpage: http://www.doc.ic.ac.uk/~gn408/
 email: gian.ntzik08@imperial.ac.uk
 github: anirothan
+projects:
+  - concurrency
 ---
 

_people/raad.md

@@ -5,5 +5,7 @@ image: /images/azalea.jpg
 position: PhD Student
 webpage: http://www.doc.ic.ac.uk/~azalea/
 email: azalea@imperial.ac.uk
+projects:
+  - concurrency
 ---
 

_people/sutherland.md

@@ -5,5 +5,7 @@ image: /images/julian.jpg
 position: PhD Student
 webpage: http://www.doc.ic.ac.uk/~jhs110/
 email: jhs110@doc.ic.ac.uk
+projects:
+  - concurrency
 ---
 

_people/xiong.md

@@ -5,5 +5,7 @@ image: /images/shale.jpg
 position: PhD Student
 webpage: http://www.doc.ic.ac.uk/~sx14/
 email: shale.xiong14@imperial.ac.uk
+projects:
+  - concurrency
 ---
 

_plugins/extra-liquid-filters.rb

+module Jekyll
+  module ExtraFilters
+ 
+    # Filters input against an arbitrary expression, where each item is assigned to variable
+    def where_exp(input, variable, expression)
+      c = parse_comparison(expression)
+      @context.stack do
+        input.select do |object|
+          @context[variable] = object
+          c.evaluate(@context)
+        end
+      end
+    end
+
+    private
+
+    def parse_comparison(exp)
+      p = Liquid::Parser.new(exp)
+      a = p.expression
+      if op = p.consume?(:comparison)
+        b = p.expression
+        c = Liquid::Condition.new(a, op, b)
+      else
+        c = Liquid::Condition.new(a)
+      end
+      p.consume(:end_of_string)
+
+      c
+    end
+  end
+end
+
+Liquid::Template.register_filter(Jekyll::ExtraFilters)

advert.md

@@ -32,6 +32,6 @@ underlying reasoning about concurrent systems, to extend the reasoning
 to distributed systems, and to test the reasoning on key applications
 such as databases, file systems, and data centres.
 
-Please take a look at our Project web page for more details, and do not
+Please take a look at our [Project web page](/research/concurrency.html) for more details, and do not
 hesitate to contact us if you are interested in one of these postdoc
 positions.

people.html

@@ -5,13 +5,5 @@ menu_order: 2
 permalink: /people/
 ---
 <div class="row">
-  {% for person in site.people %}
-    <div class="col-sm-4 col-md-4 card card-block text-xs-center people">
-      <a href="{{ person.url }}">
-        <img class="img-circle" style="width: 75%" src="{{ person.image | prepend: site.baseurl }}" alt="Photo of {{ person.firstname }} {{ person.lastname }}" />
-        <h4 class="card-title">{{ person.firstname }} {{ person.lastname }}</h4>
-      </a>
-      <h6 class="card-subtitle text-muted">{{ person.position }}</h6>
-    </div>
-  {% endfor %}
+  {% for person in site.people %}{% include person-card.html %}{% endfor %}
 </div>

research/concurrency.md

 ---
 title: Concurrency
-menu:
-menu_order: 1
+project_id: concurrency
+layout: research
 ---
 
 Concurrent programs and libraries are ubiquitous in today's world of multi-core processor architectures, 
@@ -18,7 +18,3 @@ We have applied these logics to the verification of large problems, such as data
 
 Our mission is to continually challenge and improve the state-of-the-art, targeting progress properties, specification of concurrency in POSIX filesystems, refinement of our logics so that we can deal with more advanced algorithms, and the development of automated reasoning tools based on these logics.
 
-Recent Publications
-===================
-
-{% bibliography -q @*[project ~= concurrency] --max 5 %}