use https://github.com/nunocoracao/blowfish.git

themes/blowfish/exampleSite/content/samples/diagrams-flowcharts/index.it.md

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+---
+title: "Diagrams and Flowcharts"
+date: 2019-03-06
+description: "Guide to Mermaid usage in Blowfish"
+summary: "It's easy to add diagrams and flowcharts to articles using Mermaid."
+tags: ["mermaid", "sample", "diagram", "shortcodes"]
+type: 'sample'
+---
+
+Mermaid diagrams are supported in Blowfish using the `mermaid` shortcode. Simply wrap the diagram markup within the shortcode. Blowfish automatically themes Mermaid diagrams to match the configured `colorScheme` parameter.
+
+Refer to the [mermaid shortcode]({{< ref "docs/shortcodes#mermaid" >}}) docs for more details.
+
+The examples below are a small selection taken from the [official Mermaid docs](https://mermaid-js.github.io/mermaid/). You can also [view the page source](https://raw.githubusercontent.com/nunocoracao/blowfish/main/exampleSite/content/samples/diagrams-flowcharts/index.md) on GitHub to see the markup.
+
+## Flowchart
+
+<div style="background-color:white; padding: 20px">
+{{< mermaid >}}
+graph TD
+A[Christmas] -->|Get money| B(Go shopping)
+B --> C{Let me think}
+B --> G[/Another/]
+C ==>|One| D[Laptop]
+C -->|Two| E[iPhone]
+C -->|Three| F[Car]
+subgraph Section
+C
+D
+E
+F
+G
+end
+{{< /mermaid >}}
+</div>
+
+## Sequence diagram
+
+<div style="background-color:white; padding: 20px">
+{{< mermaid >}}
+sequenceDiagram
+autonumber
+par Action 1
+Alice->>John: Hello John, how are you?
+and Action 2
+Alice->>Bob: Hello Bob, how are you?
+end
+Alice->>+John: Hello John, how are you?
+Alice->>+John: John, can you hear me?
+John-->>-Alice: Hi Alice, I can hear you!
+Note right of John: John is perceptive
+John-->>-Alice: I feel great!
+loop Every minute
+John-->Alice: Great!
+end
+{{< /mermaid >}}
+</div>
+
+## Class diagram
+
+<div style="background-color:white; padding: 20px">
+{{< mermaid >}}
+classDiagram
+Animal "1" <|-- Duck
+Animal <|-- Fish
+Animal <--o 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 >}}
+</div>
+
+## Entity relationship diagram
+
+<div style="background-color:white; padding: 20px">
+{{< mermaid >}}
+erDiagram
+CUSTOMER }|..|{ DELIVERY-ADDRESS : has
+CUSTOMER ||--o{ ORDER : places
+CUSTOMER ||--o{ INVOICE : "liable for"
+DELIVERY-ADDRESS ||--o{ ORDER : receives
+INVOICE ||--|{ ORDER : covers
+ORDER ||--|{ ORDER-ITEM : includes
+PRODUCT-CATEGORY ||--|{ PRODUCT : contains
+PRODUCT ||--o{ ORDER-ITEM : "ordered in"
+{{< /mermaid >}}
+</div>
+