Update README (#127)

* Remove features from test_files

* Modify description

* {% toc %} tag / toc_only filter

* Move "Default Configuration" to the customization section

* Add  _config.yml

* Refine English

* Add " Alternative Tools"

* Update TOC

* Update README.md

* Update TOC again

* Add "Enable TOC by default"

closes #116

Author: toshimaru

README.md

@@ -9,17 +9,19 @@
 
 - [Installation](#installation)
 - [Usage](#usage)
-  - [1. Basic Usage](#1-basic-usage)
-  - [2. Advanced Usage](#2-advanced-usage)
+  - [Basic Usage](#basic-usage)
+  - [Advanced Usage](#advanced-usage)
 - [Generated HTML](#generated-html)
-- [Default Configuration](#default-configuration)
 - [Customization](#customization)
+  - [Default Configuration](#default-configuration)
   - [TOC levels](#toc-levels)
+  - [Enable TOC by default](#enable-toc-by-default)
   - [Skip TOC](#skip-toc)
-  - [Skip TOC Section](#skip-toc-section)
+  - [Skip TOC Sectionally](#skip-toc-sectionally)
   - [CSS Styling](#css-styling)
   - [Custom CSS Class](#custom-css-class)
   - [Using Unordered/Ordered lists](#using-unorderedordered-lists)
+- [Alternative Tools](#alternative-tools)
 
 ## Installation
 
@@ -51,7 +53,7 @@ toc: true
 There are three Liquid filters, which can be applied to HTML content,
 e.g. the Liquid variable `content` available in Jekyll's templates.
 
-### 1. Basic Usage
+### Basic Usage
 
 #### `toc` filter
 
@@ -63,11 +65,11 @@ Add the `toc` filter to your site's `{{ content }}` (e.g. `_layouts/post.html`).
 
 This filter places the TOC directly above the content.
 
-### 2. Advanced Usage
+### Advanced Usage
 
 If you'd like separated TOC and content, you can use `{% toc %}` tag (or `toc_only` filter) and `inject_anchors` filter.
 
-#### `{% toc %}` tag
+#### `{% toc %}` tag / `toc_only` filter
 
 Generates the TOC itself as described [below](#generated-html).
 Mostly useful in cases where the TOC should _not_ be placed immediately
@@ -86,7 +88,8 @@ above the content but at some other place of the page, i.e. an aside.
 
 :warning: **`{% toc %}` Tag Limitation**
 
-`{% toc %}` can be available only in [Jekyll Posts](https://jekyllrb.com/docs/step-by-step/08-blogging/) and [Jekyll Collections](https://jekyllrb.com/docs/collections/). If you'd like to use `{% toc %}` except posts or collections, please use `toc_only` filter as described below.
+`{% toc %}` works only for [Jekyll Posts](https://jekyllrb.com/docs/step-by-step/08-blogging/) and [Jekyll Collections](https://jekyllrb.com/docs/collections/).
+If you'd like to use `{% toc %}` except posts or collections, please use `toc_only` filter as described below.
 
 ```html
 <div>
@@ -115,7 +118,7 @@ location with the `toc_only` filter.
 
 ## Generated HTML
 
-jekyll-toc generates an unordered list. The HTML output is as follows.
+jekyll-toc generates an unordered list by default. The HTML output is as follows.
 
 ```html
 <ul class="section-nav">
@@ -141,9 +144,14 @@ jekyll-toc generates an unordered list. The HTML output is as follows.
 
 ![screenshot](https://user-images.githubusercontent.com/803398/28401295-0dcfb7ca-6d54-11e7-892b-2f2e6ca755a7.png)
 
-## Default Configuration 
+## Customization
+
+jekyll-toc is customizable on `_config.yml`.
+
+### Default Configuration
 
 ```yml
+# _config.yml
 toc:
   min_level: 1
   max_level: 6
@@ -155,39 +163,49 @@ toc:
   item_prefix: toc-
 ```
 
-## Customization
-
 ### TOC levels
 
-The toc levels can be configured on `_config.yml`:
-
 ```yml
+# _config.yml
 toc:
   min_level: 2 # default: 1
   max_level: 5 # default: 6
 ```
 
-The default level range is `<h1>` to `<h6>`.
+The default heading range is from `<h1>` to `<h6>`.
+
+### Enable TOC by default
+
+You can enable TOC by default with [Front Matter Defaults](https://jekyllrb.com/docs/configuration/front-matter-defaults/):
+
+```yml
+# _config.yml
+defaults:
+  - scope:
+      path: ""
+    values:
+      toc: true
+```
 
 ### Skip TOC
 
-The heading is ignored in the toc when you add `no_toc` to the class.
+The heading is ignored in the toc by adding `no_toc` class.
 
 ```html
 <h1>h1</h1>
-<h1 class="no_toc">This heading is ignored in the toc</h1>
+<h1 class="no_toc">This heading is ignored in the TOC</h1>
 <h2>h2</h2>
 ```
 
-### Skip TOC Section
+### Skip TOC Sectionally
 
 The headings are ignored inside the element which has `no_toc_section` class.
 
 ```html
 <h1>h1</h1>
 <div class="no_toc_section">
-  <h2>This heading is ignored in the toc</h2>
-  <h3>This heading is ignored in the toc</h3>
+  <h2>This heading is ignored in the TOC</h2>
+  <h3>This heading is ignored in the TOC</h3>
 </div>
 <h4>h4</h4>
 ```
@@ -197,13 +215,15 @@ Which would result in only the `<h1>` & `<h4>` within the example being included
 The class can be configured on `_config.yml`:
 
 ```yml
+# _config.yml
 toc:
   no_toc_section_class: exclude # default: no_toc_section
 ```
 
-Configuring multiple classes for `no_toc_section_class` is allowed:
+Configuring multiple classes are allowed:
 
 ```yml
+# _config.yml
 toc:
   no_toc_section_class:
     - no_toc_section
@@ -229,14 +249,15 @@ The toc can be modified with CSS. The sample CSS is the following.
 
 Each TOC `li` entry has two CSS classes for further styling. The general `toc-entry` is applied to all `li` elements in the `ul.section-nav`.
 
-Depending on the heading level each specific entry refers to, it has a second CSS class `toc-XX`, where `XX` is the HTML heading tag name. For example, the TOC entry linking to a heading `<h1>...</h1>` (a single
-`#` in Markdown) will get the CSS class `toc-h1`.
+Depending on the heading level each specific entry refers to, it has a second CSS class `toc-XX`, where `XX` is the HTML heading tag name.
+For example, the TOC entry linking to a heading `<h1>...</h1>` (a single `#` in Markdown) will get the CSS class `toc-h1`.
 
 ### Custom CSS Class
 
 You can apply custom CSS classes to the generated `<ul>` and `<li>` tags.
 
 ```yml
+# _config.yml
 toc:
   # Default is "section-nav":
   list_class: my-list-class
@@ -254,6 +275,7 @@ By default the table of contents will be generated as an unordered list via `<ul
 This can be configured in `_config.yml`:
 
 ```yml
+# _config.yml
 toc:
   ordered_list: true # default is false
 ```
@@ -264,6 +286,7 @@ Add a class to the `sublist_class` configuration to append it to the `ol` tags s
 Example
 
 ```yml
+# _config.yml
 toc:
   ordered_list: true
   list_class: my-list-class
@@ -283,3 +306,10 @@ toc:
 This will produce:
 
 ![screenshot](https://user-images.githubusercontent.com/7675276/85813980-a0ea5a80-b719-11ea-9458-ccf9b86a778b.png)
+
+## Alternative Tools
+
+- Adding anchor to headings
+  - [AnchorJS](https://www.bryanbraun.com/anchorjs/)
+- Generating TOC for kramdown content
+  - [Automatic “Table of Contents” Generation](https://kramdown.gettalong.org/converter/html.html#toc) (See also. [Create Table of Contents in kramdown](https://blog.toshima.ru/2020/05/22/kramdown-toc))

jekyll-toc.gemspec

@@ -8,13 +8,13 @@ Gem::Specification.new do |spec|
   spec.name          = 'jekyll-toc'
   spec.version       = Jekyll::TableOfContents::VERSION
   spec.summary       = 'Jekyll Table of Contents plugin'
-  spec.description   = 'Jekyll (Ruby static website generator) plugin which generates a table of contents.'
+  spec.description   = 'Jekyll (Ruby static website generator) plugin which generates a Table of Contents for the page.'
   spec.authors       = %w(toshimaru torbjoernk)
   spec.email         = 'me@toshimaru.net'
   spec.files         = `git ls-files -z`.split("\x0")
   spec.homepage      = 'https://github.com/toshimaru/jekyll-toc'
   spec.license       = 'MIT'
-  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
+  spec.test_files    = spec.files.grep(%r{^(test|spec)/})
   spec.require_paths = ['lib']
 
   spec.required_ruby_version = '>= 2.4'