[ansible] Add markdown mimetype support automatically

This is needed for
https://addons.mozilla.org/en-US/firefox/addon/markdown-viewer-webext/
to work properly with local markdown files.

Also see Cimbali/markdown-viewer#2

ansible/playbooks/additional_packages.yml

@@ -49,3 +49,24 @@
     shell: update-alternatives --install /usr/bin/vim vim /usr/bin/nvim 60
   - name: Set nvim as editor alternative
     shell: update-alternatives --install /usr/bin/editor editor /usr/bin/nvim 60
+  - set_fact:
+      file_content: >
+        <?xml version="1.0"?>
+        <mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
+          <mime-type type="text/plain">
+            <glob pattern="*.md"/>
+            <glob pattern="*.mkd"/>
+            <glob pattern="*.markdown"/>
+          </mime-type>
+        </mime-info>
+  - name: Create new markdown mimetype file
+    become: no
+    file: path=~/.local/share/mime/packages/text-markdown.xml state=touch
+  - name: Insert content into mimetype file
+    become: no
+    copy: content={{ file_content }} dest=~/.local/share/mime/packages/text-markdown.xml
+  - name: Update mime database
+    become: no
+    shell: update-mime-database ~/.local/share/mime
+
+