From bbf2319da607be71daf41c399690820b15b1b4d9 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Sun, 9 Jun 2019 22:15:00 -0400
Subject: [PATCH] user guide: generate section numbers

---
 rb/gen_user_guide.rb | 31 ++++++++++++++++++++++++++++---
 1 file changed, 28 insertions(+), 3 deletions(-)

diff --git a/rb/gen_user_guide.rb b/rb/gen_user_guide.rb
index 2e3aafb..87b21d2 100644
--- a/rb/gen_user_guide.rb
+++ b/rb/gen_user_guide.rb
@@ -18,9 +18,11 @@ end
 class Generator
   class Section
     attr_reader :name
+    attr_reader :new_page
     attr_reader :contents
-    def initialize(name)
+    def initialize(name, new_page)
       @name = name
+      @new_page = new_page
       @contents = ""
     end
     def append(contents)
@@ -29,12 +31,21 @@ class Generator
   end
 
   def initialize(input, output_file, multi_file)
-    @sections = [Section.new("index")]
+    @sections = [Section.new("index", false)]
+    @current_section_number = [0]
     @lines = input.lines
     while @lines.size > 0
       line = @lines.slice!(0)
       if line =~ /^```(.*)$/
         @sections.last.append(gather_code_section($1))
+      elsif line =~ /^(#+)(>)?\s*(.*)$/
+        level_text, new_page_text, title_text = $1, $2, $3
+        level = $1.size
+        new_page = !new_page_text.nil?
+        section_number = get_next_section_number(level)
+        section_title = "#{section_number} #{title_text}"
+        @sections << Section.new(section_title, new_page)
+        @sections.last.append("#{level_text} #{section_title}")
       else
         @sections.last.append(line)
       end
@@ -42,7 +53,9 @@ class Generator
 
     renderer = Redcarpet::Render::HTML.new
     markdown = Redcarpet::Markdown.new(renderer)
-    content = markdown.render(@sections.last.contents)
+    content = @sections.map do |section|
+      markdown.render(section.contents)
+    end.join("\n")
 
     template = File.read("rb/assets/user_guide.html.erb")
     erb = ERB.new(template, nil, "<>")
@@ -68,6 +81,18 @@ class Generator
       %[<div class="code">\n<pre>#{code}</pre>\n</div>\n]
     end
   end
+
+  def get_next_section_number(level)
+    if @current_section_number.size == level - 1
+      @current_section_number << 1
+    elsif @current_section_number.size >= level
+      @current_section_number[level - 1] += 1
+      @current_section_number.slice!(level, @current_section_number.size)
+    else
+      raise "Section level change from #{@current_section_number.size} to #{level}"
+    end
+    @current_section_number.join(".")
+  end
 end
 
 input = load_file("doc/user_guide.md")