Gollum with authentication and NiceTOC, as well as a collapsed sidebar

config.rb

# To register this macro into your Gollum wiki, I recommend adding it to your
# existing `--config` file. If you don't have a configuration, you can create a
# new one at the root of your wiki and then start Gollum with:
#
#     --config your-config-file.rb
#
# This macro provides a list of links to all of the pages in your wiki (except
# for the current page). It can handle any amount of nested subdirectories.
module Gollum
   class Macro
      class NiceTOC < Gollum::Macro
         def render
            return if @wiki.pages.size.zero?
            @nest_dir=[]
            @current_page_dir = ''
            if is_sidebar
               @current_page_dir = Pathname(@page.parent_page.path).dirname.to_s
               @current_page_dir += '/'
            end

            content_tag("ul") {
               wiki.map { |name, page|
                  @nest_dir.clear
                  list_item(name, page)
               }.compact.join
            }
         end

         private

         def is_sidebar()
            @page.path.start_with?('_Sidebar')
         end

         def add(subtree, filename_parts, gollum_page)
            head, *tail = filename_parts
            subtree[head] ||= {}

            if tail.empty?
               subtree[head] = gollum_page
            else
               add(subtree[head], tail, gollum_page)
            end

            subtree
         end

         def content_tag(html_tag_name, options = {}, &block)
            tag = [html_tag_name]

            [:class, :href].each do |option|
               tag << "#{option.to_s}=\"#{options[option]}\"" if options[option]
            end

            content = ""
            content += "<#{tag.compact.join(" ")}>"
            content += (yield block).to_s.gsub(/\n/, "")
            content += "</#{html_tag_name}>"
            content
         end

         def list_item(name, gollum_page)
            if gollum_page.is_a?(::Gollum::Page)
               return if @page.url_path == gollum_page.url_path

               _current_page_class = is_sidebar && @page.parent_page.url_path == gollum_page.url_path ? "current-page" : ""

               content_tag("li", class: _current_page_class ) {
                  content_tag("a", href:"/"+ gollum_page.url_path) {
                     gollum_page.metadata_title || gollum_page.name
                  }
               }
            else
               _dir_class = ''
               _side_bar_dir_title = ""
               if is_sidebar
                  @nest_dir << name
                  _nest_dir_str = @nest_dir.join('/') + "/"
                  _dir_class = "sidebar-dir "

                  _side_bar_dir_title = "sidebar-dir-title"
                  if !@current_page_dir.start_with?(_nest_dir_str)
                     _dir_class += " collapsed "
                  end
               end
			   
               content_tag("li", class: _dir_class) {
                  content_tag("span", class: _side_bar_dir_title) {
                     content_tag("span") { name }
                  } +
                  content_tag("ul") {
                     _temp = gollum_page.map { |nom, page| list_item(nom, page) }.join
		     if is_sidebar
		       @nest_dir.pop
		     end
		     _temp
                  }
               }
            end
         end

         def wiki
            @wiki.pages.reduce({}) { |tree, gollum_page|
               add(
               tree,
               Pathname(gollum_page.path).each_filename.to_a,
               gollum_page
               )
            }
         end
      end
   end
end

wiki_options = {
   #  universal_toc: true,
   #  index_page: "Index",
   mathjax: true,
   css: true,
   js: true,
   sidebar: :left
#  local_time: true,
   show_local_time: true,
#  static: true
}

Precious::App.set(:environment, :production)
#Precious::App.set(:default_markup, :markdown) # set your favorite markup language
Precious::App.set(:wiki_options, wiki_options)

config.ru

#!/usr/bin/env ruby
require 'rubygems'
require 'gollum/auth' # Don't forget to load the gem!
require 'gollum/app'

module Gollum
   class Macro
      class NiceTOC < Gollum::Macro
         def render
            return if @wiki.pages.size.zero?
            @nest_dir=[]
            @current_page_dir = ''
            if is_sidebar
               @current_page_dir = Pathname(@page.parent_page.path).dirname.to_s
               @current_page_dir += '/'
            end

            content_tag("ul") {
               wiki.map { |name, page|
                  @nest_dir.clear
                  list_item(name, page)
               }.compact.join
            }
         end

         private

         def is_sidebar()
            @page.path.start_with?('_Sidebar')
         end

         def add(subtree, filename_parts, gollum_page)
            head, *tail = filename_parts
            subtree[head] ||= {}

            if tail.empty?
               subtree[head] = gollum_page
            else
               add(subtree[head], tail, gollum_page)
            end

            subtree
         end

         def content_tag(html_tag_name, options = {}, &block)
            tag = [html_tag_name]

            [:class, :href].each do |option|
               tag << "#{option.to_s}=\"#{options[option]}\"" if options[option]
            end

            content = ""
            content += "<#{tag.compact.join(" ")}>"
            content += (yield block).to_s.gsub(/\n/, "")
            content += "</#{html_tag_name}>"
            content
         end

         def list_item(name, gollum_page)
            if gollum_page.is_a?(::Gollum::Page)
               return if @page.url_path == gollum_page.url_path

               _current_page_class = is_sidebar && @page.parent_page.url_path == gollum_page.url_path ? "current-page" : ""

               content_tag("li", class: _current_page_class ) {
                  content_tag("a", href:"/"+ gollum_page.url_path) {
                     gollum_page.metadata_title || gollum_page.name
                  }
               }
            else
               _dir_class = ''
               _side_bar_dir_title = ""
               if is_sidebar
                  @nest_dir << name
                  _nest_dir_str = @nest_dir.join('/') + "/"
                  _dir_class = "sidebar-dir "

                  _side_bar_dir_title = "sidebar-dir-title"
                  if !@current_page_dir.start_with?(_nest_dir_str)
                     _dir_class += " collapsed "
                  end
               end
			   
               content_tag("li", class: _dir_class) {
                  content_tag("span", class: _side_bar_dir_title) {
                     content_tag("span") { name }
                  } +
                  content_tag("ul") {
                     _temp = gollum_page.map { |nom, page| list_item(nom, page) }.join
		     if is_sidebar
		       @nest_dir.pop
		     end
		     _temp
                  }
               }
            end
         end

         def wiki
            @wiki.pages.reduce({}) { |tree, gollum_page|
               add(
               tree,
               Pathname(gollum_page.path).each_filename.to_a,
               gollum_page
               )
            }
         end
      end
   end
end

users = YAML.load %q{
---
- username: rick
  password: asdf754&1129-@lUZw
  name: Rick Sanchez
  email: [email protected]
- username: morty
  password_digest: 5994471abb01112afcc18159f6cc74b4f511b99806da59b3caf5a9c173cacfc5
  name: Morty Smith
  email: [email protected]
}

# Allow unauthenticated users to read the wiki (disabled by default).
options = { allow_unauthenticated_readonly: true }

# Allow only authenticated users to change the wiki.
# (NOTE: This must be loaded *before* Precious::App!)
use Gollum::Auth, users, options

wiki_options = {
   #  universal_toc: true,
   #  index_page: "Index",
   mathjax: true,
   css: true,
   js: true,
   sidebar: :left
#  local_time: true,
   show_local_time: true,
#  static: true
}

# gollum_path = File.expand_path(File.join(File.dirname(__FILE__), 'wiki.git')) # CHANGE THIS TO POINT TO YOUR OWN WIKI REPO
Precious::App.set(:gollum_path, '/home/pi/wiki/.git')

Precious::App.set(:environment, :production)
#Precious::App.set(:environment, ENV.fetch('RACK_ENV', :production).to_sym)

#Precious::App.set(:default_markup, :markdown) # set your favorite markup language

Precious::App.set(:wiki_options, wiki_options)
run Precious::App

custom.css

.main-content > .markdown-body {
 padding-top: 0;
 padding-left: 10px;
}

.main-content > .markdown-body > p[dir='auto']:first-child:empty {
    margin-bottom: 0 !important;
}

#sidebar-content ul {
  list-style: none;
}

#sidebar-content ul ul {
  padding-left: 15px;
}

#sidebar-content .current-page a {
  text-decoration: underline;
  color: #0366d6;
}

#sidebar-content li.sidebar-dir.collapsed ul {
  display:none;
}

#sidebar-content li.sidebar-dir .sidebar-dir-title {
  cursor: pointer;
  position: relative;
}

#sidebar-content li.sidebar-dir .sidebar-dir-title:before {
  content: '\25BC'; /*Black Down-pointing Triangle ▼*/
  position: absolute;
  display: inline-block;
  left: -16px;
  font-size: 14px;
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif,"Apple Color Emoji"
}

#sidebar-content li.sidebar-dir.collapsed .sidebar-dir-title:before {
  content: '\25B6'; /*Black Right-pointing Triangle ▶*/
}

.task-list-item-checkbox {
  margin-right: 3px;
  vertical-align: middle;
}

a.reversefootnote[role='doc-backlink'] {
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif,"Apple Color Emoji"
}

custom.js

$(document).ready(function () {
  $("#sidebar-content li.sidebar-dir > span.sidebar-dir-title").click(function(){
    $(this).parent().toggleClass("collapsed")
  })
})

nice_toc.rb

# To register this macro into your Gollum wiki, I recommend adding it to your
# existing `--config` file. If you don't have a configuration, you can create a
# new one at the root of your wiki and then start Gollum with:
#
#     --config your-config-file.rb
#
# This macro provides a list of links to all of the pages in your wiki (except
# for the current page). It can handle any amount of nested subdirectories.
module Gollum
   class Macro
      class NiceTOC < Gollum::Macro
         def render
            return if @wiki.pages.size.zero?

            content_tag("ul") {
               wiki.map { |name, page| list_item(name, page) }.compact.join
            }
         end

         private

         def add(subtree, filename_parts, gollum_page)
            head, *tail = filename_parts
            subtree[head] ||= {}

            if tail.empty?
               subtree[head] = gollum_page
            else
               add(subtree[head], tail, gollum_page)
            end

            subtree
         end

         def content_tag(html_tag_name, options = {}, &block)
            tag = [html_tag_name]

            [:class, :href].each do |option|
               tag << "#{option.to_s}=\"#{options[option]}\"" if options[option]
            end

            content = ""
            content += "<#{tag.compact.join(" ")}>"
            content += (yield block).to_s.gsub(/\n/, "")
            content += "</#{html_tag_name}>"
            content
         end

         def list_item(name, gollum_page)
            if gollum_page.is_a?(::Gollum::Page)
               return if @page.url_path == gollum_page.url_path

               content_tag("li") {
                  content_tag("a", href: gollum_page.url_path) {
                     gollum_page.metadata_title || gollum_page.name
                  }
               }
            else
               content_tag("li") {
                  content_tag("span") { name } +
                  content_tag("ul") {
                     gollum_page.map { |nom, page| list_item(nom, page) }.join
                  }
               }
            end
         end

         def wiki
            @wiki.pages.reduce({}) { |tree, gollum_page|
               add(
               tree,
               Pathname(gollum_page.path).each_filename.to_a,
               gollum_page
               )
            }
         end
      end
   end
end

• Option 1, without Auth:
  gollum --config config.rb

• Option 2, with Auth:
  rackup config.ru --host 0.0.0.0 --port 4567, it can with -d to run in background

remember to put custom.js & custom.css in the git and commit.

refers to the github repo