Simplify example

fragments.py

@@ -0,0 +1,29 @@
+import os
+import re
+import string
+
+from lxml import etree
+
+FRAGMENT_PREFIX = "in"
+FRAGMENT_TAG = "^%s" % FRAGMENT_PREFIX
+FRAGMENT_CLASS = "fragment"
+
+# Search and delete the FRAGMENT_TAG anywhere in the given HTML
+# while adding the FRAGMENT_CLASS as an attribute
+# @returns the HTML with all FRAGMENT_TAG instances shifted to an attribute
+def defragmentize(html):
+  dom = etree.fromstring(html)
+  fragments = dom.xpath("//*[contains(text(), '%s')]" % FRAGMENT_TAG)
+
+  for fragment in fragments:
+    class_list = fragment.get('class')
+    if class_list == None:
+      class_list = FRAGMENT_CLASS
+    else:
+      class_list += " %s" % FRAGMENT_CLASS
+
+    fragment.set('class',  class_list)
+    fragment.text = re.sub(r"\W*\^%s\W*" % FRAGMENT_PREFIX, '', fragment.text).strip()
+
+  return etree.tostring(dom, method='html', encoding='utf-8',
+    pretty_print=True).decode('utf-8')

main.py

@@ -6,6 +6,7 @@ import pypandoc
 import re
 import sys
 import yaml
+import fragments
 
 root = ""
 lang = "de"
@@ -20,6 +21,7 @@ def compile(directory, language='en'):
     wrapper = open(os.path.join(root, 'layouts/root.html'), 'r').read()
     wrapper = wrapper.replace('@slides', compile_chapters())
     wrapper = insert_metadata(wrapper, lang=lang)
+    wrapper = fragments.defragmentize(wrapper)
     with open(os.path.join(root, 'slides.' + lang + '.html'), 'w+') as output:
         output.write(wrapper)
     print('done')
@@ -31,7 +33,7 @@ def insert_metadata(content, lang=None):
     for key, value in metadata.items():
         placeholder = '@' + key
         filler = value[lang]
-        print('replace', placeholder, 'with', filler)
+        # print('replace', placeholder, 'with', filler)
         if '@' + key in content:
             content = content.replace(placeholder, filler)
     return content
@@ -72,7 +74,7 @@ def compile_slide(slide):
     for key, value in slide_data.items():
         placeholder = '@' + key
         filler = convert_slide_content(value)
-        print('replace', placeholder, 'with', filler)
+        # print('replace', placeholder, 'with', filler)
         if '@' + key in slide:
             slide = slide.replace(placeholder, filler)
     # very unelegant attempt at inline elements
@@ -112,7 +114,16 @@ def get_slide_layout(layout_name):
 # Calls the pandoc converter to convert a given Markdown string to HTML.
 # Returns an HTML string.
 def convert_slide_content(content):
-    return pypandoc.convert_text(content, 'html', format='md')
+    filters = []
+    pdoc_args = [
+        '--mathjax', # Preparing formulas
+        '--smart'    # Smart typography (dashes, ellipses, …)
+    ]
+    return pypandoc.convert_text(
+        content, 'html',
+        format='md',
+        extra_args=pdoc_args,
+        filters=filters)
 
 # Calls a YAML parser for the given relative path inside the presentation root
 # directory. Returns a dictionary with the YAML content.
@@ -124,9 +135,9 @@ def read_yaml(path):
         except yaml.YAMLError as exc:
             print(exc)
 
-#
-def get_available_languages():
-    return read_yaml('./meta.yml')['language']
+# Retrieve the available languages as stated in the meta.yml (key: language).
+def get_available_languages(root):
+    return read_yaml(os.path.join(root, 'meta.yml'))['language']
 
 if __name__ == '__main__':
     parser = argparse.ArgumentParser()
@@ -136,7 +147,7 @@ if __name__ == '__main__':
     args = parser.parse_args()
 
     if args.language == "all":
-        for language in get_available_languages():
+        for language in get_available_languages(args.rootdirectory):
             compile(args.rootdirectory, language=language)
     else:
         compile(args.rootdirectory, language=args.language)

requirements.txt

@@ -1 +1,2 @@
 pypandoc==1.4
+lxml==4.5.0

slidify.js

@@ -8,10 +8,19 @@ function init() {
 	for (let i = 0; i < slides.length; i++) {
 		slides[i].id = `slide${i}`;
 	}
-	goToSlide(0);
+	resumeOrGoToStart();
 	document.addEventListener('keydown', onKeyPressed);
 }
 
+function resumeOrGoToStart() {
+	let urlParts = window.location.href.split('#');
+	if (urlParts.length > 1) {
+		goToSlide(parseInt(urlParts[1].replace('slide', '')))
+	} else {
+		goToSlide(0)
+	}
+}
+
 function goToSlide(index) {
 	if (index >= 0 && index < slides.length) {
 		currentSlide = index;
@@ -20,11 +29,15 @@ function goToSlide(index) {
 }
 
 function goToPreviousSlide() {
-	goToSlide(currentSlide - 1);
+	if (!showPreviousFragment()) {
+		goToSlide(currentSlide - 1);
+	}
 }
 
 function goToNextSlide() {
-	goToSlide(currentSlide + 1);
+	if (!showNextFragment()) {
+		goToSlide(currentSlide + 1);
+	}
 }
 
 function goToFirstSlide() {
@@ -39,23 +52,42 @@ function onKeyPressed(event) {
 	switch (event.keyCode) {
 		case 34: // page down
 		case 40: // arrow down
-		case 39:
-			// arrow right
+		case 39: // arrow right
 			goToNextSlide();
 			break;
 		case 33: // page up
 		case 38: // arrow up
-		case 37:
-			// arrow left
+		case 37: // arrow left
 			goToPreviousSlide();
 			break;
-		case 36:
-			// pos1
+		case 36: // pos1
 			goToFirstSlide();
 			break;
-		case 35:
-			// end
+		case 35: // end
 			goToLastSlide();
 			break;
 	}
+}
+
+function showNextFragment() {
+	let fragments = [... slides[currentSlide].querySelectorAll('.fragment')]
+	let visible = [... slides[currentSlide].querySelectorAll('.fragment.visible')]
+
+	if (fragments.length == visible.length) {
+		return false;
+	} else {
+		fragments[visible.length].classList.add('visible')
+		return true;
+	}
+}
+
+function showPreviousFragment() {
+	let visible = [...slides[currentSlide].querySelectorAll('.fragment.visible')]
+
+	if (visible.length == 0) {
+		return false;
+	} else {
+		visible[visible.length - 1].classList.remove('visible')
+		return true;
+	}
 }

test/layouts/root.html

@@ -1,14 +1,14 @@
 <!DOCTYPE html>
 <html lang="@language">
 <head>
-  <meta charset="UTF-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  <meta http-equiv="X-UA-Compatible" content="ie=edge">
-  <link rel="stylesheet" href="styles/style.scss">
+  <meta charset="UTF-8"/>
+  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
+  <meta http-equiv="X-UA-Compatible" content="ie=edge"/>
+  <link rel="stylesheet" href="styles/style.css"/>
   <title>@title</title>
 </head>
 <body>
 @slides <!-- reserved keyword -->
-<script src="scripts/slidify.js"></script>
+<script src="../slidify.js"></script>
 </body>
 </html>

test/scripts/slidify.js

@@ -1,57 +0,0 @@
-window.addEventListener('load', init)
-
-let slides
-let currentSlide
-
-function init() {
-	slides = Array.from(document.querySelectorAll('article'))
-	for (let i=0; i<slides.length; i++) {
-		slides[i].id = `slide${i}`
-	}
-	goToSlide(0)
-	document.addEventListener('keydown', onKeyPressed)
-}
-
-function goToSlide(index) {
-	if (index >= 0 && index < slides.length) {
-		currentSlide = index
-		window.location.href = window.location.href.split('#')[0] + `#slide${index}`
-	}
-}
-
-function goToPreviousSlide() {
-	goToSlide(currentSlide - 1)
-}
-
-function goToNextSlide() {
-	goToSlide(currentSlide + 1)
-}
-
-function goToFirstSlide() {
-	goToSlide(0)
-}
-
-function goToLastSlide() {
-	goToSlide(slides.length - 1)
-}
-
-function onKeyPressed(event) {
-	switch (event.keyCode) {
-		case 34: // page down
-		case 40: // arrow down
-		case 39: // arrow right
-			goToNextSlide()
-			break
-		case 33: // page up
-		case 38: // arrow up
-		case 37: // arrow left
-			goToPreviousSlide()
-			break
-		case 36: // pos1
-			goToFirstSlide()
-			break
-		case 35: // end
-			goToLastSlide()
-			break
-	}
-}

test/slides/chapter1.de.md

@@ -6,11 +6,11 @@ Wirklich auf den Punkt!
 @slide
 
 @title
-Wirklich auf den Punkt!
+^in Wirklich auf den Punkt!
 
 @content
-* Stichpunkt 1
-* Stichpunkt 2
-* Stichpunkt 3
-* Stichpunkt 4
+* ^in Stichpunkt 1
+* ^in Stichpunkt 2
+* ^in Stichpunkt 3
+* ^in Stichpunkt 4
 

test/slides/chapter2.de.md

@@ -1,10 +1,4 @@
 @slide(layout=titlepage)
 
 @title
-Wirklich auf den Punkt!
-
-@content
-* Stichpunkt 1
-* Stichpunkt 2
-* Stichpunkt 3
-* Stichpunkt 4
+Ende

test/styles/style.css

@@ -0,0 +1,50 @@
+* {
+  box-sizing: border-box;
+}
+
+html {
+  margin: 0;
+  padding: 0;
+  overflow: hidden;
+  font-size: 16pt;
+}
+
+h1 {
+  font-size: 2.4rem;
+}
+
+.fragment {
+  opacity: 0;
+  transition: .3s opacity ease-in-out;
+}
+
+.fragment.visible {
+  opacity: 1;
+}
+
+@media screen {
+  body {
+    background: black;
+    margin: 0;
+    padding: 0;
+  }
+
+  section {
+    display: contents;
+  }
+
+  article {
+    display: none;
+    align-items: center;
+    justify-content: center;
+    flex-direction: column;
+    background: white;
+    position: absolute;
+    width: 100vw;
+    height: 100vh;
+  }
+
+  article:target {
+    display: flex;
+  }
+}

test/styles/style.scss

@@ -1,33 +0,0 @@
-* {
-  box-sizing: border-box;
-}
-
-html {
-  margin: 0;
-  padding: 0;
-  overflow: hidden;
-}
-
-@media screen {
-
-  body {
-    background: black;
-    margin: 0;
-    padding: 0;
-  }
-
-  section {
-    display: contents;
-  }
-
-  article {
-	display: none;
-    background: white;
-    position: absolute;
-    border: 1px solid red;
-  }
-
-  article:target {
-    display: block;
-  }
-}