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opencode-merman

v0.1.1

Published

Native terminal Mermaid rendering for OpenCode V2, derived from the official Merman renderer

Vulnerabilities

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Links

Git

Maintainers

4nkitd4nkitd

Keywords

opencodeopencode-v2mermaidterminaltuiplugindiagrams

Readme

OpenCode Merman

Mermaid diagrams rendered directly in the OpenCode terminal.

V2 only: stable OpenCode 2.0.22+, within the 2.x series. V1 is not supported. Independent project derived from the official Merman renderer. MIT license · Upstream provenance

Install

Requires Node.js 20+, npm, and opencode on PATH. Restart the terminal client after installation.

npm

npx --yes opencode-merman@latest install

GitHub with npm

Package-only install; this does not activate the OpenCode plugin:

npm install github:4nkitd/opencode-merman#v0.1.1

Or install and configure OpenCode globally in one command:

npm install --prefix "$HOME/.local/share/opencode-merman" --omit=dev --ignore-scripts github:4nkitd/opencode-merman#v0.1.1 && node "$HOME/.local/share/opencode-merman/node_modules/opencode-merman/bin/cli.mjs" install --local

Requires Git. Keep the installed directory; OpenCode loads the plugin from there.

Requires gh. Run once with a destination that does not already exist:

mkdir -p "$HOME/.local/share" && gh repo clone 4nkitd/opencode-merman "$HOME/.local/share/opencode-merman" -- --branch v0.1.1 && cd "$HOME/.local/share/opencode-merman" && npm install --omit=dev --ignore-scripts && node bin/cli.mjs install --local

The installer preserves settings and comments, backs up existing cli.json, respects XDG_CONFIG_HOME, and disables the bundled Mermaid renderer. Reruns are safe. No API keys or server restart required; works with remote OpenCode servers too.

Supported diagrams

Supported basic syntax is listed below. All 22 examples.

| Diagram | Mermaid keyword | Terminal output | | --- | --- | --- | | Flowchart | flowchart, graph | Nodes and connections | | Sequence | sequenceDiagram | Participants and messages | | State | stateDiagram-v2 | States and transitions | | Gantt | gantt | Tasks and date ranges | | Git graph | gitGraph | Branches and commits | | Timeline | timeline | Events by period | | Line / bar chart | xychart-beta | Plots, axes and exact values | | Pie | pie | Slices, values and percentages | | Quadrant | quadrantChart | Coordinates and point legend | | Sankey | sankey-beta | Directed flows and scaled bars | | Class | classDiagram | Members and relationships | | Entity relationship | erDiagram | Attributes, keys and cardinalities | | Requirement | requirementDiagram | Requirements and relationships | | Mindmap | mindmap | Indented trees | | Journey | journey | Tasks, scores and actors | | Kanban | kanban | Columns and task cards | | Block | block-beta | Blocks, spans and connections | | Packet | packet-beta | Bit ranges and fields | | Architecture | architecture-beta | Services, ports and connections |

YAML titles, themes and XY palettes are supported. This is a terminal renderer, not the full browser Mermaid engine. Unsupported syntax falls back to the code fence.

Output previews

Actual OpenCode 2.0.22 terminal captures, shown in monochrome. Your terminal theme supplies colors. Plain-text previews.

Flowchart terminal output Line chart terminal output Bar chart terminal output Pie chart terminal output

Limitations

  • XY is vertical only; Sankey requires positive, acyclic flows.
  • Advanced class/ER syntax, nested blocks, architecture groups and browser interactions are not supported.
  • Colors and layout follow terminal constraints. Use YAML frontmatter rather than inline configuration directives for the added renderers.

Uninstall

Remove this package or checkout path and -opencode.merman from the plugins array in global cli.json, then restart the terminal client. Other settings stay unchanged.

Development

git clone https://github.com/4nkitd/opencode-merman.git && cd opencode-merman
bun install
bun run check
node bin/cli.mjs install --local

Development uses Bun 1.3+, OpenCode 2.0.22 and OpenTUI 0.5.14. Verification and integration checks.