Mermaid

The mermaid shortcode generates diagrams and flowcharts from text, in a similar manner as Markdown using the Mermaid library.

graph LR; If --> Then Then --> Else

Note

This only works in modern browsers.

Warning

Due to limitations with Mermaid, it is currently not possible to use Mermaid code fences in an initially collapsed expand shortcode. This is a know issue and can’t be fixed by this theme.

Usage

While the examples are using shortcodes with named parameter it is recommended to use codefences instead. This is because more and more other software supports Mermaid codefences (eg. GitHub) and so your markdown becomes more portable.

You are free to also call this shortcode from your own partials.

Note

To use codefence syntax you have to turn off guessSyntax for the markup.highlight setting (see the configuration section).

```mermaid { align="center" zoom="true" }
graph LR;
    If --> Then
    Then --> Else
```

{{< mermaid align="center" zoom="true" >}}
graph LR;
    If --> Then
    Then --> Else
{{< /mermaid >}}

{{ partial "shortcodes/mermaid.html" (dict
  "context" .
  "content" "graph LR;\nIf --> Then\nThen --> Else"
  "align"   "center"
  "zoom"    "true"
)}}

The generated graphs can be be panned by dragging them and zoomed by using the mousewheel. On mobile devices you can use finger gestures.

Parameter

Name	Default	Notes
align	`center`	Allowed values are `left`, `center` or `right`.
zoom	see notes	Whether the graph is pan- and zoomable. If not set the value is determined by the `mermaidZoom` setting of the site or the pages frontmatter or `false` if not set at all. - `false`: no pan or zoom - `true`: pan and zoom active
<content>	<empty>	Your Mermaid graph.

Configuration

Mermaid is configured with default settings. You can customize Mermaid’s default settings for all of your files thru a JSON object in your config.toml, override these settings per page thru your pages frontmatter or override these setting per diagramm thru diagram directives.

The JSON object of your config.toml / frontmatter is forwarded into Mermaid’s mermaid.initialize() function.

See Mermaid documentation for all allowed settings.

The theme setting can also be set by your used color variant. This will be the sitewide default and can - again - be overridden by your settings in config.toml, frontmatter or diagram directives.

Note

To use codefence syntax you have to turn off guessSyntax for the markup.highlight setting.

Global Configuration File

[params]
  mermaidInitialize = "{ \"theme\": \"dark\" }"
  mermaidZoom = true

[markup]
  [markup.highlight]
    # if `guessSyntax = true`, there will be no unstyled code even if no language
    # was given BUT Mermaid and Math codefences will not work anymore! So this is a
    # mandatory setting for your site if you want to use Mermaid codefences
    guessSyntax = false

Page’s Frontmatter

+++
mermaidInitialize = "{ \"theme\": \"dark\" }"
mermaidZoom = true
+++

Examples

Flowchart with Non-Default Mermaid Theme

{{< mermaid >}}
%%{init:{"theme":"forest"}}%%
graph LR;
    A[Hard edge] -->|Link text| B(Round edge)
    B --> C{<strong>Decision</strong>}
    C -->|One| D[Result one]
    C -->|Two| E[Result two]
{{< /mermaid >}}

%%{init:{"theme":"forest"}}%% graph LR; A[Hard edge] -->|Link text| B(Round edge) B --> C{<strong>Decision</strong>} C -->|One| D[Result one] C -->|Two| E[Result two]

Sequence Diagram with Configuration Directive

{{< mermaid >}}
%%{init:{"fontFamily":"monospace", "sequence":{"showSequenceNumbers":true}}}%%
sequenceDiagram
    Alice->>John: Hello John, how are you?
    loop Healthcheck
        John->>John: Fight against hypochondria
    end
    Note right of John: Rational thoughts!
    John-->>Alice: Great!
    John->>Bob: How about you?
    Bob-->>John: Jolly good!
{{< /mermaid >}}

%%{init:{"fontFamily":"monospace", "sequence":{"showSequenceNumbers":true}}}%% sequenceDiagram Alice->>John: Hello John, how are you? loop Healthcheck John->>John: Fight against hypochondria end Note right of John: Rational thoughts! John-->>Alice: Great! John->>Bob: How about you? Bob-->>John: Jolly good!

Class Diagram with Codefence Syntax

```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()
    }
```

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 Aligned to the Right

{{< mermaid align="right" >}}
stateDiagram-v2
    open: Open Door
    closed: Closed Door
    locked: Locked Door
    open   --> closed: Close
    closed --> locked: Lock
    locked --> closed: Unlock
    closed --> open: Open
{{< /mermaid >}}

stateDiagram-v2 open: Open Door closed: Closed Door locked: Locked Door open --> closed: Close closed --> locked: Lock locked --> closed: Unlock closed --> open: Open

Entity Relationship Model

{{< 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 >}}

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"

User Journey

{{< mermaid >}}
journey
    title My working day
    section Go to work
      Make tea: 5: Me
      Go upstairs: 3: Me
      Do work: 1: Me, Cat
    section Go home
      Go downstairs: 5: Me
      Sit down: 3: Me
{{< /mermaid >}}

journey title My working day section Go to work Make tea: 5: Me Go upstairs: 3: Me Do work: 1: Me, Cat section Go home Go downstairs: 5: Me Sit down: 3: Me

GANTT Chart

{{< mermaid >}}
gantt
        dateFormat  YYYY-MM-DD
        title Adding GANTT diagram functionality to Mermaid
        section A section
        Completed task            :done,    des1, 2014-01-06,2014-01-08
        Active task               :active,  des2, 2014-01-09, 3d
        Future task               :         des3, after des2, 5d
        Future task2              :         des4, after des3, 5d
        section Critical tasks
        Completed task in the critical line :crit, done, 2014-01-06,24h
        Implement parser and jison          :crit, done, after des1, 2d
        Create tests for parser             :crit, active, 3d
        Future task in critical line        :crit, 5d
        Create tests for renderer           :2d
        Add to Mermaid                      :1d
{{< /mermaid >}}

gantt dateFormat YYYY-MM-DD title Adding GANTT diagram functionality to Mermaid section A section Completed task :done, des1, 2014-01-06,2014-01-08 Active task :active, des2, 2014-01-09, 3d Future task : des3, after des2, 5d Future task2 : des4, after des3, 5d section Critical tasks Completed task in the critical line :crit, done, 2014-01-06,24h Implement parser and jison :crit, done, after des1, 2d Create tests for parser :crit, active, 3d Future task in critical line :crit, 5d Create tests for renderer :2d Add to Mermaid :1d

Pie Chart without Zoom

{{< mermaid zoom="false" >}}
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

Requirement Diagram

{{< mermaid >}}
    requirementDiagram

    requirement test_req {
    id: 1
    text: the test text.
    risk: high
    verifymethod: test
    }

    element test_entity {
    type: simulation
    }

    test_entity - satisfies -> test_req
{{< /mermaid >}}

requirementDiagram requirement test_req { id: 1 text: the test text. risk: high verifymethod: test } element test_entity { type: simulation } test_entity - satisfies -> test_req

Git Graph

{{< mermaid >}}
gitGraph
    commit
    commit
    branch develop
    checkout develop
    commit
    commit
    checkout main
    merge develop
    commit
    commit
{{< /mermaid >}}

gitGraph commit commit branch develop checkout develop commit commit checkout main merge develop commit commit

C4 Diagrams

{{< mermaid >}}
C4Context
    title System Context diagram for Internet Banking System
    Enterprise_Boundary(b0, "BankBoundary0") {
    Person(customerA, "Banking Customer A", "A customer of the bank, with personal bank accounts.")
    Person(customerB, "Banking Customer B")
    Person_Ext(customerC, "Banking Customer C", "desc")

    Person(customerD, "Banking Customer D", "A customer of the bank, <br/> with personal bank accounts.")

    System(SystemAA, "Internet Banking System", "Allows customers to view information about their bank accounts, and make payments.")

    Enterprise_Boundary(b1, "BankBoundary") {

        SystemDb_Ext(SystemE, "Mainframe Banking System", "Stores all of the core banking information about customers, accounts, transactions, etc.")

        System_Boundary(b2, "BankBoundary2") {
        System(SystemA, "Banking System A")
        System(SystemB, "Banking System B", "A system of the bank, with personal bank accounts. next line.")
        }

        System_Ext(SystemC, "E-mail system", "The internal Microsoft Exchange e-mail system.")
        SystemDb(SystemD, "Banking System D Database", "A system of the bank, with personal bank accounts.")

        Boundary(b3, "BankBoundary3", "boundary") {
        SystemQueue(SystemF, "Banking System F Queue", "A system of the bank.")
        SystemQueue_Ext(SystemG, "Banking System G Queue", "A system of the bank, with personal bank accounts.")
        }
    }
    }

    BiRel(customerA, SystemAA, "Uses")
    BiRel(SystemAA, SystemE, "Uses")
    Rel(SystemAA, SystemC, "Sends e-mails", "SMTP")
    Rel(SystemC, customerA, "Sends e-mails to")

    UpdateElementStyle(customerA, $fontColor="red", $bgColor="grey", $borderColor="red")
    UpdateRelStyle(customerA, SystemAA, $textColor="blue", $lineColor="blue", $offsetX="5")
    UpdateRelStyle(SystemAA, SystemE, $textColor="blue", $lineColor="blue", $offsetY="-10")
    UpdateRelStyle(SystemAA, SystemC, $textColor="blue", $lineColor="blue", $offsetY="-40", $offsetX="-50")
    UpdateRelStyle(SystemC, customerA, $textColor="red", $lineColor="red", $offsetX="-50", $offsetY="20")

    UpdateLayoutConfig($c4ShapeInRow="3", $c4BoundaryInRow="1")
{{< /mermaid >}}

C4Context title System Context diagram for Internet Banking System Enterprise_Boundary(b0, "BankBoundary0") { Person(customerA, "Banking Customer A", "A customer of the bank, with personal bank accounts.") Person(customerB, "Banking Customer B") Person_Ext(customerC, "Banking Customer C", "desc") Person(customerD, "Banking Customer D", "A customer of the bank, <br/> with personal bank accounts.") System(SystemAA, "Internet Banking System", "Allows customers to view information about their bank accounts, and make payments.") Enterprise_Boundary(b1, "BankBoundary") { SystemDb_Ext(SystemE, "Mainframe Banking System", "Stores all of the core banking information about customers, accounts, transactions, etc.") System_Boundary(b2, "BankBoundary2") { System(SystemA, "Banking System A") System(SystemB, "Banking System B", "A system of the bank, with personal bank accounts. next line.") } System_Ext(SystemC, "E-mail system", "The internal Microsoft Exchange e-mail system.") SystemDb(SystemD, "Banking System D Database", "A system of the bank, with personal bank accounts.") Boundary(b3, "BankBoundary3", "boundary") { SystemQueue(SystemF, "Banking System F Queue", "A system of the bank.") SystemQueue_Ext(SystemG, "Banking System G Queue", "A system of the bank, with personal bank accounts.") } } } BiRel(customerA, SystemAA, "Uses") BiRel(SystemAA, SystemE, "Uses") Rel(SystemAA, SystemC, "Sends e-mails", "SMTP") Rel(SystemC, customerA, "Sends e-mails to") UpdateElementStyle(customerA, $fontColor="red", $bgColor="grey", $borderColor="red") UpdateRelStyle(customerA, SystemAA, $textColor="blue", $lineColor="blue", $offsetX="5") UpdateRelStyle(SystemAA, SystemE, $textColor="blue", $lineColor="blue", $offsetY="-10") UpdateRelStyle(SystemAA, SystemC, $textColor="blue", $lineColor="blue", $offsetY="-40", $offsetX="-50") UpdateRelStyle(SystemC, customerA, $textColor="red", $lineColor="red", $offsetX="-50", $offsetY="20") UpdateLayoutConfig($c4ShapeInRow="3", $c4BoundaryInRow="1")