hugo/content/en/content-management/diagrams.md
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title description categories keywords menu toc weight
Diagrams Use fenced code blocks and markdown render hooks to display diagrams.
content management
diagrams
drawing
docs
parent weight
content-management 50
true 50

{{< new-in "0.93.0" >}}

GoAT diagrams (Ascii)

Hugo supports GoAT natively. This means that this code block:

```goat
      .               .                .               .--- 1          .-- 1     / 1
     / \              |                |           .---+            .-+         +
    /   \         .---+---.         .--+--.        |   '--- 2      |   '-- 2   / \ 2
   +     +        |       |        |       |    ---+            ---+          +
  / \   / \     .-+-.   .-+-.     .+.     .+.      |   .--- 3      |   .-- 3   \ / 3
 /   \ /   \    |   |   |   |    |   |   |   |     '---+            '-+         +
 1   2 3   4    1   2   3   4    1   2   3   4         '--- 4          '-- 4     \ 4

```

Will be rendered as:


          .               .                .               .--- 1          .-- 1     / 1
         / \              |                |           .---+            .-+         +
        /   \         .---+---.         .--+--.        |   '--- 2      |   '-- 2   / \ 2
       +     +        |       |        |       |    ---+            ---+          +
      / \   / \     .-+-.   .-+-.     .+.     .+.      |   .--- 3      |   .-- 3   \ / 3
     /   \ /   \    |   |   |   |    |   |   |   |     '---+            '-+         +
     1   2 3   4    1   2   3   4    1   2   3   4         '--- 4          '-- 4     \ 4

Mermaid diagrams

Hugo currently does not provide default templates for Mermaid diagrams. But you can easily add your own. One way to do it would be to create layouts/_default/_markup/render-codeblock-mermaid.html:

<pre class="mermaid">
  {{- .Inner | safeHTML }}
</pre>
{{ .Page.Store.Set "hasMermaid" true }}

And then include this snippet at the bottom of the content template (Note: below .Content as the render hook is not processed until .Content is executed):

{{ if .Page.Store.Get "hasMermaid" }}
  <script type="module">
    import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid/dist/mermaid.esm.min.mjs';
    mermaid.initialize({ startOnLoad: true });
  </script>
{{ end }}

With that you can use the mermaid language in Markdown code blocks:

```mermaid
sequenceDiagram
    participant Alice
    participant Bob
    Alice->>John: Hello John, how are you?
    loop Healthcheck
        John->>John: Fight against hypochondria
    end
    Note right of John: Rational thoughts <br/>prevail!
    John-->>Alice: Great!
    John->>Bob: How about you?
    Bob-->>John: Jolly good!
```

Goat ASCII diagram examples

Graphics

                                                                             .
    0       3                          P *              Eye /         ^     /
     *-------*      +y                    \                +)          \   /  Reflection
  1 /|    2 /|       ^                     \                \           \ v
   *-------* |       |                v0    \       v3           --------*--------
   | |4    | |7      |                  *----\-----*
   | *-----|-*       +-----> +x        /      v X   \          .-.<--------        o
   |/      |/       /                 /        o     \        | / | Refraction    / \
   *-------*       v                 /                \        +-'               /   \
  5       6      +z              v1 *------------------* v2    |                o-----o
                                                               v

Complex

+-------------------+                           ^                      .---.
|    A Box          |__.--.__    __.-->         |      .-.             |   |
|                   |        '--'               v     | * |<---        |   |
+-------------------+                                  '-'             |   |
                       Round                                       *---(-. |
  .-----------------.  .-------.    .----------.         .-------.     | | |
 |   Mixed Rounded  | |         |  / Diagonals  \        |   |   |     | | |
 | & Square Corners |  '--. .--'  /              \       |---+---|     '-)-'       .--------.
 '--+------------+-'  .--. |     '-------+--------'      |   |   |       |        / Search /
    |            |   |    | '---.        |               '-------'       |       '-+------'
    |<---------->|   |    |      |       v                Interior                 |     ^
    '           <---'      '----'   .-----------.              ---.     .---       v     |
 .------------------.  Diag line    | .-------. +---.              \   /           .     |
 |   if (a > b)     +---.      .--->| |       | |    | Curved line  \ /           / \    |
 |   obj->fcn()     |    \    /     | '-------' |<--'                +           /   \   |
 '------------------'     '--'      '--+--------'      .--. .--.     |  .-.     +Done?+-'
    .---+-----.                        |   ^           |\ | | /|  .--+ |   |     \   /
    |   |     | Join        \|/        |   | Curved    | \| |/ | |    \    |      \ /
    |   |     +---->  o    --o--        '-'  Vertical  '--' '--'  '--  '--'        +  .---.
 <--+---+-----'       |     /|\                                                    |  | 3 |
                      v                             not:line    'quotes'        .-'   '---'
  .-.             .---+--------.            /            A || B   *bold*       |        ^
 |   |           |   Not a dot  |      <---+---<--    A dash--is not a line    v        |
  '-'             '---------+--'          /           Nor/is this.            ---

Process

                                      .
   .---------.                       / \
  |   START   |                     /   \        .-+-------+-.      ___________
   '----+----'    .-------.    A   /     \   B   | |COMPLEX| |     /           \      .-.
        |        |   END   |<-----+CHOICE +----->| |       | +--->+ PREPARATION +--->| X |
        v         '-------'        \     /       | |PROCESS| |     \___________/      '-'
    .---------.                     \   /        '-+---+---+-'
   /  INPUT  /                       \ /
  '-----+---'                         '
        |                             ^
        v                             |
  .-----------.                 .-----+-----.        .-.
  |  PROCESS  +---------------->|  PROCESS  |<------+ X |
  '-----------'                 '-----------'        '-'

File tree

Created from https://arthursonzogni.com/Diagon/#Tree

───Linux─┬─Android
         ├─Debian─┬─Ubuntu─┬─Lubuntu
         │        │        ├─Kubuntu
         │        │        ├─Xubuntu
         │        │        └─Xubuntu
         │        └─Mint
         ├─Centos
         └─Fedora

Sequence diagram

https://arthursonzogni.com/Diagon/#Sequence

┌─────┐       ┌───┐
│Alice│       │Bob│
└──┬──┘       └─┬─┘
   │            │  
   │ Hello Bob! │  
   │───────────>│  
   │            │  
   │Hello Alice!│  
   │<───────────│  
┌──┴──┐       ┌─┴─┐
│Alice│       │Bob│
└─────┘       └───┘

Flowchart

https://arthursonzogni.com/Diagon/#Flowchart

   _________________                                                              
                   ╲                                                     ┌─────┐ 
  DO YOU UNDERSTAND ╲____________________________________________________│GOOD!│ 
 ╲ FLOW CHARTS?      yes                                                 └──┬──┘ 
  ╲_________________                                                        │    
           │no                                                               │    
  _________▽_________                    ______________________              │    
                       ╲    ┌────┐   │    
 OKAY, YOU SEE THE   ╲________________ ... AND YOU CAN SEE    ╲___│GOOD│   │    
╲ LINE LABELED 'YES'? yes             ╲ THE ONES LABELED 'NO'? yes└──┬─┘   │    
 ╲___________________                  ╲______________________       │     │    
           │no                                     │no                 │     │    
   ________▽_________                     _________▽__________         │     │    
                    ╲    ┌───────────┐                      ╲        │     │    
  BUT YOU SEE THE    ╲___│WAIT, WHAT?│  BUT YOU JUST         ╲___    │     │    
 ╲ ONES LABELED 'NO'? yes└───────────┘ ╲ FOLLOWED THEM TWICE? yes│   │     │    
  ╲__________________                   ╲____________________    │   │     │    
           │no                                     │no             │   │     │    
       ┌───▽───┐                                   │               │   │     │    
       │LISTEN.│                                   └───────┬───────┘   │     │    
       └───┬───┘                                    ┌──────▽─────┐     │     │    
     ┌─────▽────┐                                   │(THAT WASN'T│     │     │    
     │I HATE YOU│                                   │A QUESTION) │     │     │    
     └──────────┘                                   └──────┬─────┘     │     │    
                                                      ┌────▽───┐       │     │    
                                                      │SCREW IT│       │     │    
                                                      └────┬───┘       │     │    
                                                           └─────┬─────┘     │    
                                                                 │           │    
                                                                 └─────┬─────┘    
                                                               ┌───────▽──────┐   
                                                               │LET'S GO DRING│   
                                                               └───────┬──────┘   
                                                             ┌─────────▽─────────┐
                                                             │HEY, I SHOULD TRY  │
                                                             │INSTALLING FREEBSD!│
                                                             └───────────────────┘

Table

https://arthursonzogni.com/Diagon/#Table

┌────────────────────────────────────────────────┐
│                                                │
├────────────────────────────────────────────────┤
│SYNTAX     = { PRODUCTION } .                   │
├────────────────────────────────────────────────┤
│PRODUCTION = IDENTIFIER "=" EXPRESSION "." .    │
├────────────────────────────────────────────────┤
│EXPRESSION = TERM { "|" TERM } .                │
├────────────────────────────────────────────────┤
│TERM       = FACTOR { FACTOR } .                │
├────────────────────────────────────────────────┤
│FACTOR     = IDENTIFIER                         │
├────────────────────────────────────────────────┤
│          | LITERAL                             │
├────────────────────────────────────────────────┤
│          | "[" EXPRESSION "]"                  │
├────────────────────────────────────────────────┤
│          | "(" EXPRESSION ")"                  │
├────────────────────────────────────────────────┤
│          | "{" EXPRESSION "}" .                │
├────────────────────────────────────────────────┤
│IDENTIFIER = letter { letter } .                │
├────────────────────────────────────────────────┤
│LITERAL    = """" character { character } """" .│
└────────────────────────────────────────────────┘