Add pause images between chapters

slides/interstitials.txt

@@ -0,0 +1,10 @@
+https://static.pexels.com/photos/163726/belgium-antwerp-shipping-container-163726.jpeg
+https://cdn.pixabay.com/photo/2017/03/12/06/18/container-2136505_1280.jpg
+http://www.publicdomainpictures.net/pictures/100000/velka/blue-containers.jpg
+https://media.defense.gov/2013/Nov/12/2000897311/-1/-1/0/131108-F-PD986-087.JPG
+https://upload.wikimedia.org/wikipedia/commons/4/4d/Locomotive_4700_with_a_container_train_at_Concordancia_de_Poceirao.jpg
+https://upload.wikimedia.org/wikipedia/commons/7/7e/ShippingContainerSFBay.jpg
+https://upload.wikimedia.org/wikipedia/commons/c/c7/Copper_%26_Kings_Distillery_Shipping_Containers.jpg
+https://cdn.pixabay.com/photo/2017/08/01/21/54/container-2568197_1280.jpg
+http://s0.geograph.org.uk/geophotos/05/04/71/5047160_cc034d65.jpg
+https://c1.staticflickr.com/2/1513/25530579783_57d6dd3d9c_b.jpg

slides/markmaker.py

@@ -26,6 +26,14 @@ def anchor(title):
     return "toc-" + title
 
 
+def interstitials_generator():
+    images = [url.strip() for url in open("interstitials.txt") if url.strip()]
+    while True:
+        for image in images:
+            yield image
+interstitials = interstitials_generator()
+
+
 def insertslide(markdown, title):
     title_position = markdown.find("\n# {}\n".format(title))
     slide_position = markdown.rfind("\n---\n", 0, title_position+1)
@@ -38,10 +46,17 @@ def insertslide(markdown, title):
     currentindex = _titles_.index(title)
     previouslink = anchor(_titles_[currentindex-1])
     nextlink = anchor(_titles_[currentindex+1])
+    interstitial = interstitials.next()
 
     extra_slide = """
 ---
 
+class: pic
+
+.interstitial[![Image separating from the next chapter]({interstitial})]
+
+---
+
 name: {anchor}
 class: title
 
@@ -56,7 +71,7 @@ class: title
 ]
 
 .debug[(automatically generated title slide)]
-""".format(anchor=anchor(title), title=title, toclink=toclink, previouslink=previouslink, nextlink=nextlink)
+""".format(anchor=anchor(title), interstitial=interstitial, title=title, toclink=toclink, previouslink=previouslink, nextlink=nextlink)
     after = markdown[slide_position:]
     return before + extra_slide + after
 

slides/workshop.css

@@ -127,6 +127,12 @@ div.title > p:first-child {
   font-size: 300%;
 }
 
+div.pic span.interstitial img {
+  width: 100%;
+  max-height: unset;
+  max-width: unset;
+}
+
 /* "Normal" images (not on title or pic slides) shouldn't be too big */
 div img {
   max-width: 1210px;