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#!/usr/bin/env python3
"""
Mermaid Chart MCP Server — 流程图绘制工具。
使用 Mermaid 语法生成流程图，输出为 HTML 文件并可在浏览器中打开。
支持：流程图、时序图、甘特图、类图、状态图、ER图 等所有 Mermaid 图表类型。
"""
import os
import time
import subprocess
import webbrowser
from pathlib import Path
from mcp.server.fastmcp import FastMCP
mcp = FastMCP("mermaid-chart")
# ─── HTML 模板 ─────────────────────────────────────────────────────────────
HTML_TEMPLATE = """<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>{title}</title>
<style>
* {{ margin: 0; padding: 0; box-sizing: border-box; }}
body {{
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
background: #0d1117;
color: #c9d1d9;
min-height: 100vh;
display: flex;
flex-direction: column;
}}
header {{
background: #161b22;
border-bottom: 1px solid #30363d;
padding: 16px 24px;
display: flex;
align-items: center;
justify-content: space-between;
}}
header h1 {{
font-size: 18px;
font-weight: 600;
color: #f0f6fc;
}}
.toolbar {{
display: flex;
gap: 8px;
}}
.toolbar button {{
background: #21262d;
color: #c9d1d9;
border: 1px solid #30363d;
border-radius: 6px;
padding: 6px 16px;
cursor: pointer;
font-size: 13px;
transition: background 0.15s;
}}
.toolbar button:hover {{
background: #30363d;
border-color: #8b949e;
}}
.container {{
flex: 1;
display: flex;
flex-direction: column;
padding: 24px;
gap: 16px;
max-width: 1400px;
width: 100%;
margin: 0 auto;
}}
.chart-wrapper {{
background: #ffffff;
border-radius: 8px;
padding: 32px;
flex: 1;
display: flex;
align-items: center;
justify-content: center;
overflow: auto;
min-height: 400px;
}}
.chart-wrapper .mermaid {{
width: 100%;
}}
.chart-wrapper .mermaid svg {{
max-width: 100%;
height: auto;
}}
.source-code {{
background: #161b22;
border: 1px solid #30363d;
border-radius: 8px;
overflow: hidden;
}}
.source-code summary {{
padding: 12px 16px;
cursor: pointer;
font-size: 13px;
color: #8b949e;
user-select: none;
}}
.source-code summary:hover {{
color: #c9d1d9;
}}
.source-code pre {{
padding: 16px;
overflow-x: auto;
font-family: 'SF Mono', 'Fira Code', monospace;
font-size: 13px;
line-height: 1.6;
color: #79c0ff;
border-top: 1px solid #30363d;
}}
footer {{
text-align: center;
padding: 12px;
font-size: 12px;
color: #484f58;
border-top: 1px solid #21262d;
}}
@media print {{
body {{ background: #fff; }}
header, footer, .toolbar, .source-code {{ display: none; }}
.chart-wrapper {{ box-shadow: none; border: none; padding: 0; }}
}}
</style>
</head>
<body>
<header>
<h1>{title}</h1>
<div class="toolbar">
<button onclick="downloadSVG()">Export SVG</button>
<button onclick="downloadPNG()">Export PNG</button>
<button onclick="window.print()">Print</button>
</div>
</header>
<div class="container">
<div class="chart-wrapper">
<pre class="mermaid">
{mermaid_code}
</pre>
</div>
<details class="source-code">
<summary>View Mermaid Source</summary>
<pre>{mermaid_source}</pre>
</details>
</div>
<footer>Generated by Mermaid Chart MCP — Code Hacker</footer>
<script src="https://cdn.jsdelivr.net/npm/mermaid@11/dist/mermaid.min.js"></script>
<script>
mermaid.initialize({{
startOnLoad: true,
theme: 'default',
flowchart: {{ useMaxWidth: true, htmlLabels: true, curve: 'basis' }},
securityLevel: 'loose',
}});
function downloadSVG() {{
const svg = document.querySelector('.chart-wrapper svg');
if (!svg) {{ alert('Chart not rendered yet'); return; }}
const data = new XMLSerializer().serializeToString(svg);
const blob = new Blob([data], {{ type: 'image/svg+xml' }});
const a = document.createElement('a');
a.href = URL.createObjectURL(blob);
a.download = '{filename}.svg';
a.click();
}}
function downloadPNG() {{
const svg = document.querySelector('.chart-wrapper svg');
if (!svg) {{ alert('Chart not rendered yet'); return; }}
const data = new XMLSerializer().serializeToString(svg);
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
const img = new Image();
img.onload = function() {{
canvas.width = img.width * 2;
canvas.height = img.height * 2;
ctx.scale(2, 2);
ctx.fillStyle = '#ffffff';
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.drawImage(img, 0, 0);
const a = document.createElement('a');
a.href = canvas.toDataURL('image/png');
a.download = '{filename}.png';
a.click();
}};
img.src = 'data:image/svg+xml;base64,' + btoa(unescape(encodeURIComponent(data)));
}}
</script>
</body>
</html>"""
# ─── 工具函数 ──────────────────────────────────────────────────────────────
def _get_output_dir() -> Path:
"""获取输出目录，默认 ~/.mermaid-charts/"""
out_dir = Path.home() / ".mermaid-charts"
out_dir.mkdir(parents=True, exist_ok=True)
return out_dir
def _open_in_browser(file_path: str) -> str:
"""尝试在浏览器中打开文件"""
try:
# Termux: try termux-open first
result = subprocess.run(
["termux-open", file_path],
capture_output=True, text=True, timeout=5,
)
if result.returncode == 0:
return "已在浏览器中打开"
except (FileNotFoundError, subprocess.TimeoutExpired):
pass
try:
# 常规系统
webbrowser.open(f"file://{file_path}")
return "已在浏览器中打开"
except Exception:
pass
return "请手动在浏览器中打开文件"
def _escape_html(text: str) -> str:
"""转义 HTML 特殊字符"""
return text.replace("&", "&").replace("<", "<").replace(">", ">")
# ═══════════════════════════════════════════════════════════════════════════
# MCP Tools
# ═══════════════════════════════════════════════════════════════════════════
@mcp.tool()
async def render_mermaid(
code: str,
title: str = "Mermaid Chart",
output_path: str = "",
open_browser: bool = True,
) -> str:
"""Render Mermaid diagram code to an interactive HTML file and open in browser.
Supports all Mermaid diagram types: flowchart, sequence, gantt, class, state, ER, pie, etc.
Args:
code: Mermaid diagram code (e.g., 'graph TD\\n A-->B')
title: Chart title displayed in the HTML page
output_path: Custom output HTML file path (default: auto-generated in ~/.mermaid-charts/)
open_browser: Whether to open the HTML file in browser (default: True)
Example code:
graph TD
A[Start] --> B{Decision}
B -->|Yes| C[Do Something]
B -->|No| D[Do Something Else]
C --> E[End]
D --> E
"""
if not code.strip():
return "Error: Mermaid code cannot be empty"
# 确定输出路径
if output_path:
out_file = Path(output_path)
out_file.parent.mkdir(parents=True, exist_ok=True)
else:
out_dir = _get_output_dir()
timestamp = time.strftime("%Y%m%d_%H%M%S")
safe_title = "".join(c if c.isalnum() or c in "-_" else "_" for c in title)[:40]
out_file = out_dir / f"{safe_title}_{timestamp}.html"
filename = out_file.stem
# 生成 HTML
html = HTML_TEMPLATE.format(
title=_escape_html(title),
mermaid_code=code,
mermaid_source=_escape_html(code),
filename=filename,
)
out_file.write_text(html, encoding="utf-8")
abs_path = str(out_file.resolve())
# 打开浏览器
browser_msg = ""
if open_browser:
browser_msg = _open_in_browser(abs_path)
return (
f"Mermaid 图表已生成: {abs_path}\n"
f"标题: {title}\n"
f"{browser_msg}\n"
f"功能:\n"
f" - Export SVG / PNG 按钮\n"
f" - 打印支持\n"
f" - 展开查看 Mermaid 源码"
)
@mcp.tool()
async def flowchart(
nodes: list[dict],
title: str = "Flowchart",
direction: str = "TD",
output_path: str = "",
open_browser: bool = True,
) -> str:
"""Generate a flowchart from structured node data. Easier than writing raw Mermaid syntax.
Args:
nodes: List of node definitions. Each node is a dict with:
- id: Node ID (e.g., "A", "B")
- label: Display text (e.g., "Start", "Process Data")
- shape: Optional shape - "rect" (default), "round", "diamond", "circle", "stadium"
- next: List of target node IDs or dicts with "to" and optional "label"
e.g., ["B", "C"] or [{"to": "B", "label": "Yes"}, {"to": "C", "label": "No"}]
title: Chart title
direction: Flow direction - "TD" (top-down), "LR" (left-right), "BT" (bottom-top), "RL" (right-left)
output_path: Custom output path
open_browser: Open in browser (default: True)
Example:
nodes = [
{"id": "A", "label": "Start", "shape": "stadium", "next": ["B"]},
{"id": "B", "label": "Is Valid?", "shape": "diamond", "next": [{"to": "C", "label": "Yes"}, {"to": "D", "label": "No"}]},
{"id": "C", "label": "Process", "next": ["E"]},
{"id": "D", "label": "Error", "shape": "round", "next": ["E"]},
{"id": "E", "label": "End", "shape": "stadium"},
]
"""
if not nodes:
return "Error: nodes list cannot be empty"
shape_map = {
"rect": ("[", "]"),
"round": ("(", ")"),
"diamond": ("{", "}"),
"circle": ("((", "))"),
"stadium": ("([", "])"),
}
lines = [f"graph {direction}"]
for node in nodes:
nid = node.get("id", "")
label = node.get("label", nid)
shape = node.get("shape", "rect")
left, right = shape_map.get(shape, ("[", "]"))
lines.append(f" {nid}{left}\"{label}\"{right}")
for node in nodes:
nid = node.get("id", "")
nexts = node.get("next", [])
for nxt in nexts:
if isinstance(nxt, dict):
target = nxt.get("to", "")
label = nxt.get("label", "")
if label:
lines.append(f" {nid} -->|\"{label}\"| {target}")
else:
lines.append(f" {nid} --> {target}")
else:
lines.append(f" {nid} --> {nxt}")
mermaid_code = "\n".join(lines)
return await render_mermaid(
code=mermaid_code,
title=title,
output_path=output_path,
open_browser=open_browser,
)
@mcp.tool()
async def sequence_diagram(
interactions: list[dict],
title: str = "Sequence Diagram",
output_path: str = "",
open_browser: bool = True,
) -> str:
"""Generate a sequence diagram from structured interaction data.
Args:
interactions: List of interactions. Each is a dict with:
- from: Source participant
- to: Target participant
- message: Message text
- type: Optional arrow type - "solid" (default), "dashed", "async"
- note: Optional note text (renders as a note over the 'from' participant)
title: Chart title
output_path: Custom output path
open_browser: Open in browser (default: True)
Example:
interactions = [
{"from": "Client", "to": "Server", "message": "HTTP Request"},
{"from": "Server", "to": "Database", "message": "Query", "type": "solid"},
{"from": "Database", "to": "Server", "message": "Results", "type": "dashed"},
{"from": "Server", "to": "Client", "message": "HTTP Response", "type": "dashed"},
]
"""
if not interactions:
return "Error: interactions list cannot be empty"
arrow_map = {
"solid": "->>",
"dashed": "-->>",
"async": "-)",
}
lines = ["sequenceDiagram"]
for item in interactions:
if "note" in item:
lines.append(f" Note over {item['from']}: {item['note']}")
frm = item.get("from", "")
to = item.get("to", "")
msg = item.get("message", "")
arrow = arrow_map.get(item.get("type", "solid"), "->>")
lines.append(f" {frm}{arrow}{to}: {msg}")
mermaid_code = "\n".join(lines)
return await render_mermaid(
code=mermaid_code,
title=title,
output_path=output_path,
open_browser=open_browser,
)
@mcp.tool()
async def list_charts(directory: str = "") -> str:
"""List all generated Mermaid chart HTML files.
Args:
directory: Directory to scan (default: ~/.mermaid-charts/)
"""
scan_dir = Path(directory) if directory else _get_output_dir()
if not scan_dir.is_dir():
return f"Directory does not exist: {scan_dir}"
files = sorted(scan_dir.glob("*.html"), key=lambda f: f.stat().st_mtime, reverse=True)
if not files:
return f"No chart files found in {scan_dir}"
lines = [f"=== Mermaid Charts ({len(files)} files) ===", f"目录: {scan_dir}", ""]
for f in files[:20]:
size_kb = f.stat().st_size / 1024
mtime = time.strftime("%Y-%m-%d %H:%M", time.localtime(f.stat().st_mtime))
lines.append(f" {f.name} ({size_kb:.1f}KB, {mtime})")
if len(files) > 20:
lines.append(f" ... and {len(files) - 20} more")
return "\n".join(lines)
@mcp.tool()
async def open_chart(file_path: str) -> str:
"""Open an existing Mermaid chart HTML file in the browser.
Args:
file_path: Path to the HTML file to open
"""
path = Path(file_path)
if not path.is_file():
return f"Error: File not found: {file_path}"
abs_path = str(path.resolve())
msg = _open_in_browser(abs_path)
return f"{msg}: {abs_path}"
# ─── 入口 ──────────────────────────────────────────────────────────────────
if __name__ == "__main__":
mcp.run(transport="sse", host="0.0.0.0", port=8008)