256 lines
6.6 KiB
Markdown
256 lines
6.6 KiB
Markdown
---
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title: Writing a New Post
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author: Cotes Chung
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date: 2019-08-08 14:10:00 +0800
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categories: [Blogging, Tutorial]
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tags: [writing]
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render_with_liquid: false
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---
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## Naming and Path
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Create a new file named `YYYY-MM-DD-TITLE.EXTENSION` and put it in the `_posts/` of the root directory. Please note that the `EXTENSION` must be one of `md` and `markdown`.
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## Front Matter
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Basically, you need to fill the [Front Matter](https://jekyllrb.com/docs/front-matter/) as below at the top of the post:
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```yaml
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---
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title: TITLE
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date: YYYY-MM-DD HH:MM:SS +/-TTTT
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categories: [TOP_CATEGORIE, SUB_CATEGORIE]
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tags: [TAG] # TAG names should always be lowercase
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---
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```
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> **Note**: The posts' ***layout*** has been set to `post` by default, so there is no need to add the variable ***layout*** in Front Matter block.
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### Timezone of date
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In order to accurately record the release date of a post, you should not only setup the `timezone` of `_config.yml` but also provide the the post's timezone in field `date` of its Front Matter block. Format: `+/-TTTT`, e.g. `+0800`.
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### Categories and Tags
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The `categories` of each post is designed to contain up to two elements, and the number of elements in `tags` can be zero to infinity. For instance:
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```yaml
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categories: [Animal, Insect]
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tags: [bee]
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```
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## Table of Contents
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By default, the **T**able **o**f **C**ontents (TOC) is displayed on the right panel of the post. If you want to turn it off globally, go to `_config.yml` and set the value of variable `toc` to `false`. If you want to turn off TOC for specific post, add the following to post's [Front Matter](https://jekyllrb.com/docs/front-matter/):
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```yaml
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---
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toc: false
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---
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```
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## Comments
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Similar to TOC, the [Disqus](https://disqus.com/) comments is loaded by default in each post, and the global switch is defined by variable `comments` in file `_config.yml` . If you want to close the comment for specific post, add the following to the **Front Matter** of the post:
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```yaml
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---
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comments: false
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---
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```
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## Mathematics
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For website performance reasons, the mathematical feature won't be loaded by default. But it can be enabled by:
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```yaml
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---
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math: true
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---
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```
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## Mermaid
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[**Mermaid**](https://github.com/mermaid-js/mermaid) is a great diagrams generation tool. To enable it on your post, add the following to the YAML block:
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```yaml
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---
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mermaid: true
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---
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```
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Then you can use it like other markdown language: surround the graph code with ```` ```mermaid ```` and ```` ``` ````.
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## Images
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### Preview image
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If you want to add an image to the top of the post contents, specify the attribute `src`, `width`, `height` and `alt` for the image:
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```yaml
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---
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image:
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src: /path/to/image/file
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width: 1000 # in pixels
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height: 400 # in pixels
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alt: image alternative text
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---
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```
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Except for `alt`, all other options are necessary, especially the `width` and `height`, which are related to user experience and web page loading performance. Later section ["Image size"](#image-size) will also mention this.
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### Image caption
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Add italics to the next line of an image，then it will become the caption and appear at the bottom of the image:
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```markdown
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_Image Caption_
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```
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{: .nolineno}
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### Image size
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In order to prevent the page content layout from shifting when the image is loaded, we should set the width and height for each image:
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```markdown
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{: width="700" height="400" }
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```
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{: .nolineno}
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### Image position
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By default, the image is centered, but you can specify the position by using one of class `normal` , `left` and `right`. For example:
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- **Normal position**
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Image will be left aligned in below sample:
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```markdown
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{: .normal }
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```
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{: .nolineno}
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- **Float to the left**
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```markdown
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{: .left }
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```
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{: .nolineno}
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- **Float to the right**
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```markdown
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{: .right }
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```
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{: .nolineno}
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> **Limitation**: Once the position of the image is specified, the image caption should not be added.
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### Image shadow
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The screenshots of the program window can be considered to show the shadow effect, and the shadow will be visible in the `light` mode:
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```markdown
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{: .shadow }
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```
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{: .nolineno}
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### CDN URL
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If you host the images on the CDN, you can save the time of repeatedly writing the CDN url by assigning the variable `img_cdn` of `_config.yml` file:
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```yaml
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img_cdn: https://cdn.com
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```
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{: file='_config.yml' .nolineno}
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Once `img_cdn` is assigned, the CDN url will be added to the path of all images (images of site avatar and posts) starting with `/`.
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For instance, when using images:
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```markdown
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```
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{: .nolineno}
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The parsing result will automatically add the CDN prefix `https://cdn.com` before the image path:
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```html
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<img src="https://cdn.com/path/to/flower.png" alt="The flower">
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```
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{: .nolineno}
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## Pinned Posts
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You can pin one or more posts to the top of the home page, and the fixed posts are sorted in reverse order according to their release date. Enable by:
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```yaml
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---
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pin: true
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---
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```
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## Code Block
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Markdown symbols ```` ``` ```` can easily create a code block as follows:
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```
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This is a plaintext code snippet.
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```
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### Specifying Language
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Using ```` ```{language} ```` you will get a code block with syntax highlight:
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````markdown
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```yaml
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key: value
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```
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````
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> **Limination**: The Jekyll style `highlight` tag ais not compatible with this theme.
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### Line Number
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By default, all languages except `plaintext`, `console` and `terminal` will display line numbers. When you want to hide the line number of the code block, you can append `{: .nolineno}` at the next line:
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````markdown
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```shell
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echo 'No more line numbers!'
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```
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{: .nolineno}
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````
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### Specifying the Filename
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You may have noticed that the code language will be displayed on the left side of the header of the code block. If you want to replace it with the file name, you can add the attribute `file` to achieve this:
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````markdown
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```shell
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# content
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```
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{: file="path/to/file" }
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````
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### Liquid Codes
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If you want to display the **Liquid** snippet, surround the liquid code with `{% raw %}` and `{% endraw %}`:
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````markdown
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{% raw %}
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```liquid
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{% if product.title contains 'Pack' %}
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This product's title contains the word Pack.
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{% endif %}
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```
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{% endraw %}
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````
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Or adding `render_with_liquid: false` (Requires Jekyll 4.0 or higher) to the post's YAML block.
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## Learn More
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For more knowledge about Jekyll posts, visit the [Jekyll Docs: Posts](https://jekyllrb.com/docs/posts/).
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