hugo/docs/content/en/content-management/diagrams.md
Bjørn Erik Pedersen 08fdca9d93 Add Markdown diagrams and render hooks for code blocks
You can now create custom hook templates for code blocks, either one for all (`render-codeblock.html`) or for a given code language (e.g. `render-codeblock-go.html`).

We also used this new hook to add support for diagrams in Hugo:

* Goat (Go ASCII Tool) is built-in and enabled by default; just create a fenced code block with the language `goat` and start draw your Ascii diagrams.
* Another popular alternative for diagrams in Markdown, Mermaid (supported by GitHub), can also be implemented with a simple template. See the Hugo documentation for more information.

Updates #7765
Closes #9538
Fixes #9553
Fixes #8520
Fixes #6702
Fixes #9558
2022-02-24 18:59:50 +01:00

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---
title: Diagrams
date: 2022-02-20
categories: [content management]
keywords: [diagrams,drawing]
menu:
docs:
parent: "content-management"
weight: 22
weight: 22
toc: true
---
## Mermaid Diagrams
```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
```goat
.
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
```goat
+-------------------+ ^ .---.
| 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
```goat
.
.---------. / \
| START | / \ .-+-------+-. ___________
'----+----' .-------. A / \ B | |COMPLEX| | / \ .-.
| | END |<-----+CHOICE +----->| | | +--->+ PREPARATION +--->| X |
v '-------' \ / | |PROCESS| | \___________/ '-'
.---------. \ / '-+---+---+-'
/ INPUT / \ /
'-----+---' '
| ^
v |
.-----------. .-----+-----. .-.
| PROCESS +---------------->| PROCESS |<------+ X |
'-----------' '-----------' '-'
```
### File tree
Created from https://arthursonzogni.com/Diagon/#Tree
```goat { width=300 color="orange" }
───Linux─┬─Android
├─Debian─┬─Ubuntu─┬─Lubuntu
│ │ ├─Kubuntu
│ │ ├─Xubuntu
│ │ └─Xubuntu
│ └─Mint
├─Centos
└─Fedora
```
### Sequence Diagram
https://arthursonzogni.com/Diagon/#Sequence
```goat { class="w-40" }
┌─────┐ ┌───┐
│Alice│ │Bob│
└──┬──┘ └─┬─┘
│ │
│ Hello Bob! │
│───────────>│
│ │
│Hello Alice!│
│<───────────│
┌──┴──┐ ┌─┴─┐
│Alice│ │Bob│
└─────┘ └───┘
```
### Flowchart
https://arthursonzogni.com/Diagon/#Flowchart
```goat
_________________
╲ ┌─────┐
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
```goat { class="w-80 dark-blue" }
┌────────────────────────────────────────────────┐
│ │
├────────────────────────────────────────────────┤
│SYNTAX = { PRODUCTION } . │
├────────────────────────────────────────────────┤
│PRODUCTION = IDENTIFIER "=" EXPRESSION "." . │
├────────────────────────────────────────────────┤
│EXPRESSION = TERM { "|" TERM } . │
├────────────────────────────────────────────────┤
│TERM = FACTOR { FACTOR } . │
├────────────────────────────────────────────────┤
│FACTOR = IDENTIFIER │
├────────────────────────────────────────────────┤
│ | LITERAL │
├────────────────────────────────────────────────┤
│ | "[" EXPRESSION "]" │
├────────────────────────────────────────────────┤
│ | "(" EXPRESSION ")" │
├────────────────────────────────────────────────┤
│ | "{" EXPRESSION "}" . │
├────────────────────────────────────────────────┤
│IDENTIFIER = letter { letter } . │
├────────────────────────────────────────────────┤
│LITERAL = """" character { character } """" .│
└────────────────────────────────────────────────┘
```