front-matter corresponding author support

merges #470
closes #469

Co-authored-by: Daniel Himmelstein <[email protected]>

USAGE.md

@@ -260,6 +260,7 @@ initials: DSH  # optional
 orcid: 0000-0002-3012-7446  # mandatory
 twitter: dhimmel  # optional
 email: [email protected]  # suggested
+corresponding: true  # optional, if set to true displays author's email for correspondence
 affiliations:  # as a list, strongly suggested
   - Department of Systems Pharmacology and Translational Therapeutics, University of Pennsylvania
   - Department of Biological & Medical Informatics, University of California, San Francisco

content/00.front-matter.md

@@ -27,7 +27,9 @@ on {{manubot.date}}.
 
 {## Template for listing authors ##}
 {% for author in manubot.authors %}
-+ **{{author.name}}**<br>
++ **{{author.name}}**
+  {% if author.corresponding is defined and author.corresponding == true -%}^[✉](#correspondence)^{%- endif -%}
+  <br>
   {%- if author.orcid is defined and author.orcid is not none %}
     ![ORCID icon](images/orcid.svg){.inline_icon width=16 height=16}
     [{{author.orcid}}](https://orcid.org/{{author.orcid}})
@@ -49,3 +51,13 @@ on {{manubot.date}}.
   {%- endif %}
   </small>
 {% endfor %}
+
+::: {#correspondence}
+✉ — Correspondence possible via {% if manubot.ci_source is defined -%}[GitHub Issues](https://github.com/{{manubot.ci_source.repo_slug}}/issues){% else %}GitHub Issues{% endif %}
+{% if manubot.authors|map(attribute='corresponding')|select|max -%}
+or email to
+{% for author in manubot.authors|selectattr("corresponding") -%}
+{{ author.name }} \<{{ author.email }}\>{{ ", " if not loop.last else "." }}
+{% endfor %}
+{% endif %}
+:::

content/metadata.yaml

@@ -24,3 +24,4 @@ authors:
     affiliations:
       - Department of Something, University of Whatever
       - Department of Whatever, University of Something
+    corresponding: true