pre and post HTML templates for all txt2tags conversions

Remaining: cleaning of t2t files (remove unnecessary options)

bin/clean_html

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+### This script finds all .t2t (txt2tags) files and deletes the corresponding html file
+
+find . -name '*.t2t' | while read t2t ; do
+  html="${t2t%.t2t}.html"
+  rm -f "$html"
+done

bin/update_html

@@ -3,9 +3,38 @@
 ### This script finds all .t2t (txt2tags) files and updates the corresponding
 ### .html file, if it is out-of-date.
 
+config=".txt2tagsrc"
+pre="_pre.html"
+post="_post.html"
+tmp="tmp.html"
+
 find . -name '*.t2t' | while read t2t ; do
   html="${t2t%.t2t}.html"
   if [ "$t2t" -nt "$html" ] ; then
-    txt2tags -thtml "$t2t"
+    txt2tags --config-file="$config" --target=html "$t2t"
+    cat $pre $html $post > $tmp
+    mv $tmp $html
+    head1=$(head -n 1 "$t2t")
+    head2=$(tail -n+2 "$t2t" | head -n 1)
+    head3=$(tail -n+3 "$t2t" | head -n 1)
+
+    # Replace "headers" from t2t in final HTML
+    # Documentation here: https://txt2tags.org/userguide/headerarea
+    if [ -n "$head1" ] ; then
+      sed -i.bak "s/{{HEAD1}}/$head1/" "$html" && rm "$html.bak"
+    else
+      sed -i.bak -E "s/<.+{{HEAD1}}.+>//" "$html" && rm "$html.bak"
+      continue # empty headers
+    fi
+    if [ -n "$head2" ] ; then
+      sed -i.bak "s/{{HEAD2}}/$head2/" "$html" && rm "$html.bak"
+    else
+      sed -i.bak -E "s/<.+{{HEAD2}}.+>//" "$html" && rm "$html.bak"
+    fi
+    if [ -n "$head3" ] ; then
+      sed -i.bak "s/{{HEAD3}}/$head3/" "$html" && rm "$html.bak"
+    else
+      sed -i.bak -E "s/<.+{{HEAD3}}.+>//" "$html" && rm "$html.bak"
+    fi
   fi
-done
+done