Mermaid

Generate diagrams, flowcharts, and piecharts from text in a similar manner as markdown.

Mermaid is library that helps you generate diagrams, flowcharts, and piecharts from text in a similar manner as markdown.

With compose theme, you can use mermaid using a custom shortcode as follows:

Sequence Diagrams

Syntax

{{< 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!
{{< /mermaid >}}

Result

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
prevail... John-->>Alice: Great! John->>Bob: How about you? Bob-->>John: Jolly good!

Flow Charts

Syntax

{{< mermaid >}}
flowchart TB
  c1-->a2
  subgraph one
  a1-->a2
  end
  subgraph two
  b1-->b2
  end
  subgraph three
  c1-->c2
  end
  one --> two
  three --> two
  two --> c2
{{< /mermaid >}}

Result

flowchart TB c1-->a2 subgraph one a1-->a2 end subgraph two b1-->b2 end subgraph three c1-->c2 end one --> two three --> two two --> c2

Graphs

Syntax

{{< mermaid >}}
graph TB
  sq[Square shape] --> ci((Circle shape))

  subgraph A
    od>Odd shape]-- Two line<br/>edge comment --> ro
    di{Diamond with <br/> line break} -.-> ro(Rounded<br>square<br>shape)
    di==>ro2(Rounded square shape)
  end

  %% Notice that no text in shape are added here instead that is appended further down
  e --> od3>Really long text with linebreak<br>in an Odd shape]

  %% Comments after double percent signs
  e((Inner / circle<br>and some odd <br>special characters)) --> f(,.?!+-*ز)

  cyr[Cyrillic]-->cyr2((Circle shape Начало));

    classDef green fill:#9f6,stroke:#333,stroke-width:2px;
    classDef orange fill:#f96,stroke:#333,stroke-width:4px;
    class sq,e green
    class di orange
{{< /mermaid >}}

Result

graph TB sq[Square shape] --> ci((Circle shape)) subgraph A od>Odd shape]-- Two line
edge comment --> ro di{Diamond with
line break} -.-> ro(Rounded
square
shape) di==>ro2(Rounded square shape) end %% Notice that no text in shape are added here instead that is appended further down e --> od3>Really long text with linebreak
in an Odd shape] %% Comments after double percent signs e((Inner / circle
and some odd
special characters)) --> f(,.?!+-*ز) cyr[Cyrillic]-->cyr2((Circle shape Начало)); classDef green fill:#9f6,stroke:#333,stroke-width:2px; classDef orange fill:#f96,stroke:#333,stroke-width:4px; class sq,e green class di orange

Syntax

{{< mermaid >}}
graph LR
  A[Hard edge] -->|Link text| B(Round edge)
  B --> C{Decision}
  C -->|One| D[Result one]
  C -->|Two| E[Result two]
{{< /mermaid >}}

Result

graph LR A[Hard edge] -->|Link text| B(Round edge) B --> C{Decision} C -->|One| D[Result one] C -->|Two| E[Result two]

Class Diagram

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

stateDiagram-v2 [*] --> Active state Active { [*] --> NumLockOff NumLockOff --> NumLockOn : EvNumLockPressed NumLockOn --> NumLockOff : EvNumLockPressed -- [*] --> CapsLockOff CapsLockOff --> CapsLockOn : EvCapsLockPressed CapsLockOn --> CapsLockOff : EvCapsLockPressed -- [*] --> ScrollLockOff ScrollLockOff --> ScrollLockOn : EvScrollLockPressed ScrollLockOn --> ScrollLockOff : EvScrollLockPressed }

stateDiagram-v2 State1: The state with a note note right of State1 Important information! You can write notes. end note State1 --> State2 note left of State2 : This is the note to the left.

Relationship Diagrams

Syntax

{{< mermaid >}}
erDiagram
  CUSTOMER ||--o{ ORDER : places
  ORDER ||--|{ LINE-ITEM : contains
  CUSTOMER }|..|{ DELIVERY-ADDRESS : uses
{{< /mermaid >}}

Result

erDiagram CUSTOMER ||--o{ ORDER : places ORDER ||--|{ LINE-ITEM : contains CUSTOMER }|..|{ DELIVERY-ADDRESS : uses

User Journey

Syntax

{{< 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: 5: Me
{{< /mermaid >}}

Result

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: 5: Me

Gantt

Syntax

{{< mermaid >}}
gantt
  dateFormat  YYYY-MM-DD
  title       Adding GANTT diagram functionality to mermaid
  excludes    weekends
  %% (`excludes` accepts specific dates in YYYY-MM-DD format, days of the week ("sunday") or "weekends", but not the word "weekdays".)

  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

  section Documentation
  Describe gantt syntax               :active, a1, after des1, 3d
  Add gantt diagram to demo page      :after a1  , 20h
  Add another diagram to demo page    :doc1, after a1  , 48h

  section Last section
  Describe gantt syntax               :after doc1, 3d
  Add gantt diagram to demo page      :20h
  Add another diagram to demo page    :48h
{{< /mermaid >}}

Result

gantt dateFormat YYYY-MM-DD title Adding GANTT diagram functionality to mermaid excludes weekends %% (`excludes` accepts specific dates in YYYY-MM-DD format, days of the week ("sunday") or "weekends", but not the word "weekdays".) 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 section Documentation Describe gantt syntax :active, a1, after des1, 3d Add gantt diagram to demo page :after a1 , 20h Add another diagram to demo page :doc1, after a1 , 48h section Last section Describe gantt syntax :after doc1, 3d Add gantt diagram to demo page :20h Add another diagram to demo page :48h

Pie Chart

{{< mermaid >}}
pie
  title Key elements in Product X
  "Calcium" : 42.96
  "Potassium" : 50.05
  "Magnesium" : 10.01
  "Iron" :  5
{{< /mermaid >}}

Result

pie title Key elements in Product X "Calcium" : 42.96 "Potassium" : 50.05 "Magnesium" : 10.01 "Iron" : 5