1 files changed, 51 insertions, 0 deletions
diff --git a/plugins/series.lua b/plugins/series.lua
new file mode 100644
index 0000000..b94f136
--- /dev/null
+++ b/plugins/series.lua
@@ -0,0 +1,51 @@
+function get_title_from_path (path)
+   if Sys.is_file(path) then
+      local content_raw = Sys.read_file(path)
+      local content_dom = HTML.parse(content_raw)
+      local title = HTML.select_one(content_dom, "h1")
+
+      if title then
+         return String.trim(HTML.inner_html(title))
+      else
+         Plugin.fail(path .. ' has no <h1> tag')
+      end
+   else
+      Log.warning('Missing file: ' .. path)
+   end
+end
+
+function generate_nav_item_from_title (title, url, template)
+    local env = {}
+    env["url"] = url
+    env["title"] = title
+    local new_content = String.render_template(template, env)
+    return HTML.parse(new_content)
+end
+
+function generate_nav_items (cwd, cls, template)
+  local elements = HTML.select(page, cls)
+
+  local i = 1
+  while elements[i] do
+    local element = elements[i]
+    local url = HTML.strip_tags(element)
+    local path = Sys.join_path(cwd, url)
+    local title_str = get_title_from_path(path)
+
+    HTML.replace_content(
+      element,
+      generate_nav_item_from_title(title_str, url, template)
+    )
+
+    i = i + 1
+  end
+end
+
+cwd = build_dir
+
+home_template = 'This page is part of the series “<a href="/{{ url }}">{{ title }}</a>.”'
+nav_template = '<a href="/{{ url }}">{{ title }}</a>'
+
+generate_nav_items(cwd, ".series", home_template)
+generate_nav_items(cwd, ".series-prev", nav_template)
+generate_nav_items(cwd, ".series-next", nav_template)