[travis] Build markdown sources using ox-hugo

.travis.yml

@@ -1,9 +1,21 @@
 dist: xenial
 
+addons:
+  apt:
+    sources:
+      - sourceline: 'ppa:kelleyk/emacs'
+    packages:
+      - emacs26
+      - graphviz
+
 install:
   - curl -LO https://github.com/gohugoio/hugo/releases/download/v0.55.6/hugo_0.55.6_Linux-64bit.deb
   - sudo dpkg -i hugo_0.55.6_Linux-64bit.deb
+  - curl -LO https://downloads.sourceforge.net/project/plantuml/plantuml.jar
+  - curl -LO https://downloads.sourceforge.net/project/ditaa/ditaa/0.9/ditaa0_9.zip
+  - unzip ditaa0_9.zip ditaa0_9.jar
 script:
+  - emacs --batch --eval "(load-file \"ci-setup.el\")" blog.org -f org-hugo-export-all-wim-to-md
   - hugo -v
 
 deploy:

ci-setup.el

@@ -0,0 +1,21 @@
+(require 'package)
+(package-initialize)
+
+(add-to-list 'package-archives '("org" . "https://orgmode.org/elpa/") t)
+(add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/") t)
+(package-refresh-contents)
+(package-install 'use-package)
+(require 'use-package)
+
+(use-package org
+  :ensure org-plus-contrib
+  :config
+  (setq org-confirm-babel-evaluate nil
+        org-plantuml-jar-path "plantuml.jar"
+        org-ditaa-jar-path "ditaa0_9.jar"))
+
+(use-package ox-hugo
+  :ensure t)
+
+(defun org-hugo-export-all-wim-to-md ()
+  (org-hugo-export-wim-to-md :all-subtrees nil nil :noerror))