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Showing content from https://github.com/mermaid-js/mermaid-cli below:

mermaid-js/mermaid-cli: Command line tool for the Mermaid library

This is a command-line interface (CLI) for mermaid. It takes a mermaid definition file as input and generates an SVG/PNG/PDF file as output.

npm install -g @mermaid-js/mermaid-cli

Convert Mermaid mmd Diagram File To SVG

mmdc -i input.mmd -o output.svg

Note

See Alternative installations if you don't want to install the package globally.

Locate how to call the mmdc executable for your preferred method i.e. Docker, Yarn, NPM, local install, etc.

mmdc -i input.mmd -o output.png -t dark -b transparent

The --cssFile option can be used to inline some custom CSS.

Please see ./test-positive/flowchart1.css for an example of a CSS file that has animations.

Warning: If you want to override mermaid's themeCSS, we recommend instead adding {"themeCSS": "..."}) to your mermaid --configFile. You may also need to use !important to override mermaid's themeCSS.

Warning: Inline CSS files may be blocked by your browser, depending on the HTTP Content-Security-Policy header of the website that hosts your SVG.

mmdc --input test-positive/flowchart1.mmd --cssFile test-positive/flowchart1.css -o docs/animated-flowchart.svg

mmdc -i readme.template.md -o readme.md

This command transforms a markdown file itself. The mermaid-cli will find the mermaid diagrams, create SVG files from them and refer to those in the markdown output.

This:

### Some markdown
```mermaid
graph
   [....]
```

### Some more markdown
```mermaid
sequenceDiagram
   [....]
```

### Mermaid with custom title/desc
```mermaid
graph
   accTitle: My title here
   accDescr: My description here
   A-->B
```

Becomes:

### Some markdown
![diagram](./readme-1.svg)

### Some more markdown
![diagram](./readme-2.svg)

### Mermaid with custom title/desc
![My description here](./readme-3.svg "My title here")

You can easily pipe input from stdin. This example shows how to use a heredoc to send a diagram as stdin to mermaid-cli (mmdc).

cat << EOF  | mmdc --input -
    graph TD
    A[Client] --> B[Load Balancer]
EOF

docker pull minlag/mermaid-cli

or pull from Github Container Registry

docker pull ghcr.io/mermaid-js/mermaid-cli/mermaid-cli

or e.g. version 8.8.0

docker pull minlag/mermaid-cli:8.8.0

The container looks for input files in /data. So for example, if you have a diagram defined on your system in /path/to/diagrams/diagram.mmd, you can use the container to generate an SVG file as follows:

docker run --rm -u `id -u`:`id -g` -v /path/to/diagrams:/data minlag/mermaid-cli -i diagram.mmd

Or, if using Podman, instead do:

podman run --userns keep-id --user ${UID} --rm -v /path/to/diagrams:/data:z ghcr.io/mermaid-js/mermaid-cli/mermaid-cli -i diagram.mmd

The key differences in the podman command versus the docker command are:

• The addition of the --userns keep-id argument. This allows the container to keep the same UID as the current user's UID in the container namespace instead of mapping to a subuid. To learn more, see the userns=mode documentation.
• The addition of :z to the end of the volume mapping. This instructs podman to relabel the files in the volume with the SELinux label container_file_t, which allows processes in the container to access the files. See the "Labeling Volume Mounts" section of podman-run (1) for more info.

In previous version, the input files were mounted in /home/mermaidcli. You can restore this behaviour with the --workdir option:

docker run [...] --workdir=/home/mermaidcli minlag/mermaid-cli [...]

It's possible to call mermaid-cli via a Node.JS API. Please be aware that the NodeJS API is not covered by semver, as mermaid-cli follows mermaid's versioning.

import { run } from "@mermaid-js/mermaid-cli"

await run(
   "input.mmd", "output.svg", // {optional options},
)

Some people are having issues installing this tool globally. Installing it locally is an alternative solution:

npm install @mermaid-js/mermaid-cli
./node_modules/.bin/mmdc -h

npx is installed by default with NPM. It downloads and runs commands at the same time. To use Mermaid CLI with npx, you need to use the -p flag because the package name is different than the command it installs (mmdc). npx -p @mermaid-js/mermaid-cli mmdc -h

Warning

This method of installation is no longer supported. For more details, see the discussion. An old version of mermaid-cli can be installed with brew.

1. Linux sandbox issue
2. Docker permission denied issue
3. How to setup up mermaid to use already installed chromium?

Contributions are welcome. See the contribution guide.

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