From f3d10e74c2c37195dc5fac09af5ff02d13307bf3 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Paul=20H=C3=A4nsch?= <paul@plutz.net>
Date: Wed, 27 Feb 2019 23:20:59 +0100
Subject: [PATCH] image embedding (for inline style bg images)

---
 clickslide.css     |  3 +++
 clickslide.sh      | 37 +++++++++++++++++++++++++------------
 example/demo.short |  6 +++---
 3 files changed, 31 insertions(+), 15 deletions(-)

diff --git a/clickslide.css b/clickslide.css
index 56313c8..174384b 100644
--- a/clickslide.css
+++ b/clickslide.css
@@ -1,6 +1,9 @@
 * {
   box-sizing: border-box;
   margin: 0; padding: 0;
+  background-position: center;
+  background-repeat: no-repeat;
+  background-size: cover;
 }
 
 /*  min-height: 240px */     body { font-size:  9px; }
diff --git a/clickslide.sh b/clickslide.sh
index ddc94c3..dcb01db 100755
--- a/clickslide.sh
+++ b/clickslide.sh
@@ -22,16 +22,29 @@ depth=0 ucdepth=-1
       line="${line#*>}"
       tag="${tag}>"
     fi
-  
+
+    ### Image embedding for Inline styles
+    while expr "$tag" : '.*<[^>]*style="[^"]*url("\?[^)]\+\.\(png\|jpg\|jpeg\|gif\|svg\)"\?)'; do
+      pre="${tag%%url(*)*}"
+      post="${tag#*url(*)}"
+      file="${tag#${pre}url(}" file="${file%)$post}"
+      file="${file#"}" file="${file%"}"
+      echo Inlining Image "$file" >&2
+      if [ -r "$file" ]; then
+        tag="${pre}url('data:image/${file##*.};base64,$(base64 <"${file}" |tr -d \\n)')${post}"
+      fi
+    done >/dev/null
+
+    ### Tag Processing
     case $tag in
-      *\<head\>*|\*\<head\ *\>)
+      *\<head\>*|\*\<head\ *\>)  # Inline styles into head
         printf '%s<meta name="viewport" content="width=device-width">
                 <style type="text/css"><!--\n' "${tag%${tag#*<head*>}}"
         cat "${0%/*}/clickslide.css"
         printf '\n--></style>%s' "${tag#*<head*>}"
         tag='' depth=$((depth + 1))
         ;;
-      *\<slide\ *id=\"?*\"*\>*)
+      *\<slide\ *id=\"?*\"*\>*)  # Count slide id, insert "next" button
         prev="$next"
         next="${tag#*<slide }" next="${next#*id=\"}" next="${next%\"*}"
         next="autoslide${idoff}"
@@ -48,25 +61,25 @@ depth=0 ucdepth=-1
           "${tag%<slide*}" "$next" "$idoff" "$next" "${tag#*<slide}"
         tag='' depth=$((depth + 1))
         ;;
-      *\</slide\>*)
+      *\</slide\>*)  # Insert "previous" button
         printf '%s</div><a class="prevslide" href="#%s">previous</a>%s' \
           "${tag%</slide>*}" "$prev" "${tag#*</slide>}"
         tag='' depth=$((depth - 1))
         ;;
-      *\<*class=\"uncover\"*\>*)
-        #printf '%s<li></li>' "$tag"
-        printf '%s' "$tag"
-        tag='' depth=$((depth + 1))
-        ucdepth=$depth
-        ;;
-      *\<body*\>*)
+      *\<body*\>*)  # Insert toplevel link
         printf '%s<a href="#" class="toplevel">overview</a>' "$tag"
         tag='' depth=$((depth + 1))
         ;;
-      *\</body*\>*)
+      *\</body*\>*)  # Insert total slide count
         printf '<span class="count">%i</span>%s' "$idoff" "$tag"
         tag='' depth=$((depth - 1))
         ;;
+      *\<*class=\"uncover\"*\>*)  # Insert checkboxes in "uncover" lists
+        #printf '%s<li></li>' "$tag"
+        printf '%s' "$tag"
+        tag='' depth=$((depth + 1))
+        ucdepth=$depth
+        ;;
       *\</*\>*)
         printf %s "$tag"
         tag='' depth=$((depth - 1))
diff --git a/example/demo.short b/example/demo.short
index ae866d4..5df9a71 100644
--- a/example/demo.short
+++ b/example/demo.short
@@ -40,8 +40,8 @@
     ]
   ]
   [slide [h2 Simplifying HTML]
-    Maintain the flexibility of plain HTML. Decrease the verbosity of the code. [br]
-    [pre style="display: inline-block; width: 46%;"
+    Maintain the flexibility of plain HTML. Decrease verbosity of the code. [br]
+    [pre style="display: inline-block; width: 46%; background-image: url(exb0_light.jpg);"
 \<html\>
   \<head\>
     \<title\>Demo\</title\>
@@ -51,7 +51,7 @@
   \</body\>
 \</html\>
     ]
-    [pre style="display: inline-block; width: 46%;"
+    [pre style="display: inline-block; width: 46%; background-image: url(exb3_light.jpg);"
 \[html
   \[head
     \[title Demo\]
-- 
2.39.2