From 0fc47a1856fe8e4868149f654157d86d6c3794e8 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Paul=20H=C3=A4nsch?= <paul@plutz.net>
Date: Tue, 12 Feb 2019 10:14:36 +0100
Subject: [PATCH] auto elements

---
 autoslide.css | 149 +++++++++++++++++++++++++++++++++++++++++++++-----
 autoslide.sh  |  30 +++++++---
 example.short |  16 +++++-
 3 files changed, 168 insertions(+), 27 deletions(-)

diff --git a/autoslide.css b/autoslide.css
index f07cb7e..5a1b7d7 100644
--- a/autoslide.css
+++ b/autoslide.css
@@ -1,27 +1,146 @@
-div {
+* {
+  box-sizing: border-box;
+  margin: 0; padding: 0;
+}
+
+body {
+  padding: 2em 1em 4em 1em;
+  background-color: #555;
+  text-align: center;
+  overflow-x: hidden;
+}
+body * { text-align: left; }
+
+a.previous, a.next ,a.toplevel {
+  text-decoration: none;
+}
+
+footer {
+  position: fixed;
+  bottom: 0; left: 0;
+  width: 100%;
+  font-size: 14pt;
+  padding: .5em 4em .5em 5em;
+  text-align: center;
+  background-color: #EEE;
+  color: #888;
+  z-index: 3;
+}
+
+a.toplevel {
+  position: fixed;
+  bottom: 0; left: 3em;
+  width: 1ex; overflow: hidden;
+  font-size: 18pt;
+  padding-bottom: .25em;
+  color: #888;
+  z-index: 4;
+}
+a.toplevel:before {
+  content: '\2191'
+}
+
+/* ==== Overview Screen ==== */
+
+div.slide {
+  position: relative;
   display: inline-block;
   overflow: hidden;
-  width: 40em; height: 30em;
+  width: 20em; height: 15em;
   border: 1px solid black;
-  font-size: 2pt;
+  font-size: 6pt;
 }
-div:target {
-  display: fixed;
-  top: 0; bottom: 0;
-  left:0; right: 0;
+
+div.slide + a { display: none; }
+a.nextslide {
+  display: inline-block;
+  position: relative;
+  vertical-align: top;
+  margin-left: 2em;
+  margin-right: -20em;
+  font-size: 6pt;
+  width: 20em; line-height: 15em;
+  color: rgba(0, 0, 0, 0);
+  z-index: 1;
+}
+a.nextslide:nth-of-type(2) { margin-left: 0; }
+div.slide:nth-of-type(1) { margin-right: .5em; }
+div.slide:last-of-type { margin-right: 2.5em; }
+
+/* ==== Slide Appearance ==== */
+
+div.slide {
+  padding: 0 1em;
+  background-color: #FFF;
+}
+
+div.slide:after {
+  position: absolute;
+  bottom: 0; width: 100%;
+  height: 1.25em;
+  background-color: #EEE;
+  content: '';
+  margin-left: -1em;
+  margin-right: -1em;
+}
+
+h1 {
+  left: 0; right: 0;
+  display: block;
+  text-align: center;
+  font-size: 1.5em;
+  background-color: #EEE;
+  padding: .25em 1em;
+  margin-left: -1em;
+  margin-right: -1em;
+}
+
+div.slide ul li, div.slide ol {
+  indent: 20em;
+}
+
+/* ==== Slide Display ==== */
+
+div.slide:target {
+  position: fixed;
+  z-index: 2;
+  top: 0; left: 0;
+  width: 100%; height: 100%;
   font-size: 24pt;
+  background-color: white;
+}
+div.slide:target + a,
+div.slide:target + a + a {
+  position: static;
+  display: block;
+  font-size: 18pt;
+  line-height: 1em;
+  color: #888;
+}
+:target + a:before, :target + a + a:before {
+  display: block;
+  position: fixed;
+  bottom: 0;
+  font-size: 18pt;
+  color: #888;
+  padding: 0 1em .25em 1em;
+  z-index: 3;
 }
+:target + a:before { left:  0; }
+:target + a:before { content: '<<'; }
+:target + a + a:before { right: 0; }
+:target + a + a:before { content: '>>'; }
 
-ul { color: #CCC; }
-ul:hover { color: #000; }
-ul li:first-child { height: 0; }
-ul li:first-child:before,
-ul li:hover:before,
-ul li:active + li:before {
+:target .uncover { color: #DDD; }
+:target .uncover:hover { color: #000; }
+:target .uncover *:first-child { height: 0; }
+:target .uncover *:first-child:before,
+:target .uncover *:hover:before,
+:target .uncover *:active + *:before {
   content: ' ';
   position: fixed;
   top: 0; bottom: 0;
   left: 0; right: 0;
 }
-ul li:hover ~ li { color: #CCC; }
-ul li:active:before { display: none; }
+:target .uncover *:hover ~ * { color: #DDD; }
+:target .uncover *:active:before { display: none; }
diff --git a/autoslide.sh b/autoslide.sh
index e2c40a8..8c9ca1e 100755
--- a/autoslide.sh
+++ b/autoslide.sh
@@ -1,7 +1,6 @@
 #!/bin/sh
 
-last='' curr='' next=''
-idoff=1
+prev='' next='' idoff=1
 
 "${0%/*}"/cgilite/html-sh.sed | {
   line="$(line)"
@@ -24,20 +23,33 @@ idoff=1
   
     case $tag in
       *\<slide\ *id=\"?*\"*\>*)
-        prev="$curr" curr="$next"
+        prev="$next"
         next="${tag#*<slide }"
         next="${next#*id=\"}"
         next="${next%\"*}"
-        printf '%s<a href="#%s">previous</a><a href="#%s">next</a><slide %s' \
-          "${tag%<slide *}" "$prev" "$next" "${tag#*<slide }"
+        printf '%s<a class="nextslide" href="#%s">next</a><div class="slide" id="%s" %s' \
+          "${tag%<slide *}" "$next" "$next" "${tag#*<slide }"
         tag=''
         ;;
-      *\<slide\ *\>*)
-        prev="$curr" curr="$next"
+      *\<slide\ *\>*|*\<slide\>*)
+        prev="$next"
         next="autoslide${idoff}"
         idoff="$((idoff + 1))"
-        printf '%s<a href="#%s">previous</a><a href="#%s">next</a><slide %s' \
-          "${tag%<slide *}" "$prev" "$next" "${tag#*<slide }"
+        printf '%s<a class="nextslide" href="#%s">next</a><div class="slide" id="%s" %s' \
+          "${tag%<slide*}" "$next" "$next" "${tag#*<slide}"
+        tag=''
+        ;;
+      *\</slide\>*)
+        printf '%s</div><a class="prevslide" href="#%s">previous</a>%s' \
+          "${tag%</slide>*}" "$prev" "${tag#*</slide>}"
+        tag=''
+        ;;
+      *\<*class=\"uncover\"*\>*)
+        printf '%s<span></span>' "$tag"
+        tag=''
+        ;;
+      *\<body*\>*)
+        printf '%s<a href="#" class="toplevel">overview</a>' "$tag"
         tag=''
         ;;
       *\<*\>*)
diff --git a/example.short b/example.short
index fa9c524..fb21c0d 100644
--- a/example.short
+++ b/example.short
@@ -4,16 +4,26 @@
   [title Demo]
   [link rel="stylesheet" type="text/css" href="autoslide.css"]
 ][body
-  [div #1
+  [footer Paul Hänsch | VHS Chemnitz
+]
+  [slide
     [h1 Folie A]
-    [ul [li]
+    [ul .uncover
       [li Eins]
       [li Zwei]
       [li Drei]
       [li Vier]
       [li Fünf]
     ]
-  ][div #2
+  ][slide
     [h1 Folie B]
+    [ol .uncover [li x] [li y] [li z]]
   ]
+  [slide [h1 Slide]] [slide [h1 Slide]] [slide [h1 Slide]] [slide [h1 Slide]]
+  [slide [h1 Slide]] [slide [h1 Slide]] [slide [h1 Slide]] [slide [h1 Slide]]
+  [slide [h1 Slide]] [slide [h1 Slide]] [slide [h1 Slide]] [slide [h1 Slide]]
+  [slide [h1 Slide]] [slide [h1 Slide]] [slide [h1 Slide]] [slide [h1 Slide]]
+  [slide [h1 Slide]] [slide [h1 Slide]] [slide [h1 Slide]] [slide [h1 Slide]]
+  [slide [h1 Slide]] [slide [h1 Slide]] [slide [h1 Slide]] [slide [h1 Slide]]
+  [slide [h1 Slide]] [slide [h1 Slide]] [slide [h1 Slide]] [slide [h1 Slide]]
 ]]
-- 
2.39.2