diegomarino/claude-toolshed/mermaid-render

/mermaid-render

User request: "$ARGUMENTS"

Task

Render Mermaid diagrams from an existing .mmd file or a .md file with Mermaid blocks to SVG image files.

Process

1. Resolve Plugin Path:

``bash find "$HOME/.claude/plugins/cache" -type d -name "mermaid" -path "*/skills/mermaid" 2>/dev/null | head -1 ``

If empty, run fallback:

``bash find "$HOME" -maxdepth 8 -type d -name "mermaid" -path "*/skills/mermaid" 2>/dev/null | head -1 ``

Use the returned path as PLUGIN_DIR.

1. Ensure Dependencies:

``bash bash "$PLUGIN_DIR/scripts/ensure-deps.sh" ``

If .claude/mermaid.json does not exist, display a one-time nudge before continuing:

> First time using the mermaid plugin? Run /mermaid-config to pick a theme and output settings. Using defaults for now (zinc-light, ./diagrams).

1. Read Config: If .claude/mermaid.json exists, read:

• theme (default: zinc-light)
• output_directory (default: ./diagrams)
• output_format (default: svg)

Resolve output path:

• If output_directory is "same" AND an input file path is known:

OUTPUT_DIR=$(dirname {input_file})

• If output_directory is "same" AND no argument was provided:

OUTPUT_DIR=./diagrams

• Otherwise:

OUTPUT_DIR=<output_directory from config>

1. Determine Input:

• .mmd file → render directly
• .md file → extract Mermaid blocks first:

node "$PLUGIN_DIR/scripts/extract_mermaid.js" {file}

• Directory → find all .mmd files:

find {dir} -name "*.mmd" -not -path "*/node_modules/*"

• No argument → ask: "Which file or directory should I render?"

1. Render:

Run for each input file. resilient_diagram.js renders SVG via beautiful-mermaid and maps errors to troubleshooting.md.

Theme handling:

• If theme == "custom" and themeVariables is present in config:

``bash node "$PLUGIN_DIR/scripts/resilient_diagram.js" {input_file} --output-dir $OUTPUT_DIR --custom-theme '{"bg":"#...","fg":"#..."}' ``

Pass the serialized themeVariables JSON as the --custom-theme value.

• If theme == "custom" but themeVariables is absent from config: render without custom theme and display a note:

> Custom theme configured but no themeVariables found — run /mermaid-config → option 6 to define colors.

• Otherwise:

``bash node "$PLUGIN_DIR/scripts/resilient_diagram.js" {input_file} --output-dir $OUTPUT_DIR --theme {theme} ``

1. Report:

• List all output files generated with full paths
• If rendering failed: "Run /mermaid-config → health check to diagnose missing dependencies."

Output

Rendered 3 diagrams:
  ✅ diagrams/sequence-auth.svg
  ✅ diagrams/er-users.svg
  ✅ diagrams/architecture.svg