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oam/knowledge base/markdown.md

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Markdown

# Markdown
ReadMe's Markdown engine.
## Table of contents <!-- omit in toc -->
1. [Syntax highlighting](#syntax-highlighting)
1. [TODO lists](#todo-lists)
1. [Folded content](#folded-content)
1. [Images](#images)
1. [Diagrams](#diagrams)
1. [Flow chart A.K.A. graph](#flow-chart-aka-graph)
1. [Sequence diagram](#sequence-diagram)
1. [Class diagram](#class-diagram)
1. [State diagram](#state-diagram)
1. [Gantt diagram](#gantt-diagram)
1. [Pie chart](#pie-chart)
1. [Math](#math)
1. [Troubleshooting](#troubleshooting)
1. [Escape the backtick character](#escape-the-backtick-character)
1. [VS Code and mermaid graph in Markdown preview](#vs-code-and-mermaid-graph-in-markdown-preview)
1. [Further readings](#further-readings)
1. [Sources](#sources)
## Syntax highlighting
Specify the language right after the code block's opening:
```ruby
def index
puts "hello world"
end
```
```csharp
private void index(){
MessageBox.Show("hello world");
}
```
## TODO lists
Use `[ ]` after the bullet point or numbered list character to switch them for an empty ballot box, and `[x]` for a checked one.
1. [ ] 1
1. [ ] 2
- [x] a
- [x] Point 3
## Folded content
Use a `<details>` HTML tag:
```md
<details>
<summary>Fold/Open</summary>
Folded content
</details>
```
## Images
Add an image:
```md
![description](path/to.image)
![description][reference name]
```
Control width and height:
```md
<img src="./cat.png" width=300px height=200px />
```
Align in the center:
```md
<div align="center">![sleep-cat](./cat.png)</div>
```
## Diagrams
See [mermaid.js], [The magical Markdown I bet you don't know] and [slaise/High-level-Markdown].
Code blocks for diagrams can either:
- start with ` ```mermaid ` and finish with ` ``` `, or
- start with `:::mermaid` and finish with `:::`.
### Flow chart A.K.A. graph
```md
:::mermaid
graph LR
A[Christmas] -->|Get money| B(Go shopping)
B --> C{Let me think}
subgraph work
C -->|One| D[Laptop]
C --x|Two| E[iPhone]
C -.->|Three| F[fa:fa-car Car]
C ==> G((Bike))
C --> J>TV]
end
:::
```
```mermaid
graph LR
A[Christmas] -->|Get money| B(Go shopping)
B --> C{Let me think}
subgraph work
C -->|One| D[Laptop]
C --x|Two| E[iPhone]
C -.->|Three| F[fa:fa-car Car]
C ==> G((Bike))
C --> J>TV]
end
```
### Sequence diagram
```md
:::mermaid
sequenceDiagram
Alice->>+John: Hello John, how are you?
Alice->>+John: John, can you hear me?
John-->>-Alice: Hi Alice, I can hear you!
John-->>-Alice: I feel great!
:::
```
```mermaid
sequenceDiagram
Alice->>+John: Hello John, how are you?
Alice->>+John: John, can you hear me?
John-->>-Alice: Hi Alice, I can hear you!
John-->>-Alice: I feel great!
```
### Class diagram
```md
:::mermaid
classDiagram
Animal <|-- Duck
Animal <|-- Fish
Animal <|-- Zebra
Animal : +int age
Animal : +String gender
Animal: +isMammal()
Animal: +mate()
class Duck{
+String beakColor
+swim()
+quack()
}
class Fish{
-int sizeInFeet
-canEat()
}
class Zebra{
+bool is_wild
+run()
}
:::
```
```mermaid
classDiagram
Animal <|-- Duck
Animal <|-- Fish
Animal <|-- Zebra
Animal : +int age
Animal : +String gender
Animal: +isMammal()
Animal: +mate()
class Duck{
+String beakColor
+swim()
+quack()
}
class Fish{
-int sizeInFeet
-canEat()
}
class Zebra{
+bool is_wild
+run()
}
```
### State diagram
```md
:::mermaid
stateDiagram-v2
[*] --> Still
Still --> [*]
Still --> Moving
Moving --> Still
Moving --> Crash
Crash --> [*]
:::
```
```mermaid
stateDiagram-v2
[*] --> Still
Still --> [*]
Still --> Moving
Moving --> Still
Moving --> Crash
Crash --> [*]
```
### Gantt diagram
```md
:::mermaid
gantt
title A Gantt Diagram
dateFormat YYYY-MM-DD
section Section
A task :a1, 2014-01-01, 30d
Another task :after a1 , 20d
section Another
Task in sec :2014-01-12 , 12d
another task : 24d
:::
```
```mermaid
gantt
title A Gantt Diagram
dateFormat YYYY-MM-DD
section Section
A task :a1, 2014-01-01, 30d
Another task :after a1 , 20d
section Another
Task in sec :2014-01-12 , 12d
another task : 24d
```
### Pie chart
```md
:::mermaid
pie title Pets adopted by volunteers
"Dogs" : 386
"Cats" : 85
"Rats" : 15
:::
```
```mermaid
pie title Pets adopted by volunteers
"Dogs" : 386
"Cats" : 85
"Rats" : 15
```
## Math
```md
$\sum_{n=1}^{10} n^2$
$$\sum_{n=1}^{10} n^2$$
```
$\sum_{n=1}^{10} n^2$
$$\sum_{n=1}^{10} n^2$$
## Troubleshooting
### Escape the backtick character
Include a non-code formatted backtick by escaping it normally (with a `\`).
Render it in an inline code block using double backticks instead of single backticks.
Alternatively, use a code block. This will wrap everything in a `<pre>` HTML tag.
To do this, either indent 4 spaces to start a code block, or use fenced code blocks if supported.
### VS Code and mermaid graph in Markdown preview
Install and enable [`bierner.markdown-mermaid`][bierner.markdown-mermaid]'s extension.
## Further readings
- Official [documentation]
- [Extended syntax]
- [Linguist supported language syntax list]
## Sources
All the references in the [further readings] section, plus the following:
- [Escaping backticks]
- [Escaping backtick in Markdown]
- [The magical Markdown I bet you don't know]
- [slaise/High-level-Markdown]
- [Syntax highlighting in Markdown]
<!-- project's references -->
[basic syntax]: https://www.markdownguide.org/basic-syntax
[code blocks]: https://docs.readme.com/rdmd/docs/code-blocks
[documentation]: https://docs.readme.com/rdmd/docs
[extended syntax]: https://www.markdownguide.org/extended-syntax/
<!-- internal references -->
[mermaid.js]: mermaid.js.md
<!-- external references -->
[bierner.markdown-mermaid]: https://marketplace.visualstudio.com/items?itemName=bierner.markdown-mermaid
[escaping backtick in markdown]: https://www.growingwiththeweb.com/2015/06/escaping-backtick-in-markdown.html
[escaping backticks]: https://www.markdownguide.org/basic-syntax/#escaping-backticks
[linguist supported language syntax list]: https://github.com/github/linguist/blob/master/lib/linguist/languages.yml
[slaise/high-level-markdown]: https://github.com/slaise/High-level-Markdown
[syntax highlighting in markdown]: https://support.codebasehq.com/articles/tips-tricks/syntax-highlighting-in-markdown
[the magical markdown i bet you don't know]: https://medium.com/codex/the-magical-markdown-i-bet-you-dont-know-b51f8c049773