# lib_add_head_tail_html.rb
# add header and tail to body (html)
def add_head_tail_html html_file
sample_md = <<'EOS'
---
title: 'Gtk4 tutorial for beginners'
---
# sample header
Main contents begin here.
~~~{.C .numberLines}
int main(int argc, char **argv) {
}
~~~
|English|Japanese|
|:-----:|:------:|
|potato|jagaimo|
|carrot|ninjin|
|onion|tamanegi|
EOS
File.write "sample.md", sample_md
if (! system("pandoc", "-s", "-o", "sample.html", "sample.md"))
raise ("add_head_tail_html: pandoc retuns error status #{$?}.\n")
end
sample_html = File.read("sample.html")
sample_html.gsub!(//,'')
head = []
sample_html.each_line do |l|
if l =~ /<\/head>/
break
elsif l != "\n"
head << l
end
end
i = head.find_index { |line| line =~ /<\/style>/}
raise "No tag in sample.html which is generated by pandoc." unless i.instance_of?(Integer)
head.insert(i, " body {width: 1080px; margin: 0 auto; font-size: large;}\n")
head.insert(i, " h2 {padding: 10px; background-color: #d0f0d0; }\n")
head.insert(i, " div.sourceCode { margin: 10px; padding: 16px 10px 8px 10px; border: 2px solid silver; background-color: ghostwhite; overflow-x:scroll}\n")
head.insert(i, " pre:not(.sourceCode) { margin: 10px; padding: 16px 10px 8px 10px; border: 2px solid silver; background-color: ghostwhite; overflow-x:scroll}\n")
head.insert(i, " table {margin-left: auto; margin-right: auto; border-collapse: collapse; border: 1px solid;}\n")
head.insert(i, " th {padding: 2px 6px; border: 1px solid; background-color: ghostwhite;}\n")
head.insert(i, " td {padding: 2px 6px; border: 1px solid;}\n")
head.insert(i, " img {display: block; margin-left: auto; margin-right: auto;}\n")
head.insert(i, " figcaption {text-align: center;}\n")
head << "\n"
head << "\n"
head = head.join
tail=<<'EOS'
EOS
File.delete("sample.md")
File.delete("sample.html")
body = File.read(html_file)
File.write(html_file, head+body+tail)
end