app.py

import gradio as gr
import base64

def render_mermaid(mermaid_code):
    # Create PNG output from the Mermaid code
    graphbytes = mermaid_code.encode("utf8")
    base64_bytes = base64.urlsafe_b64encode(graphbytes)
    base64_string = base64_bytes.decode("ascii")
    png_url = "https://mermaid.ink/img/" + base64_string

    return png_url

with gr.Blocks(theme=gr.themes.Citrus()) as mrender:
    gr.Markdown("# Mermaid Diagram Renderer")
    gr.Markdown("Input your Mermaid diagram code to generate a PNG image.")
    
    with gr.Row():
        with gr.Column():
            mermaid_input = gr.Textbox(label="Mermaid Code", placeholder="Enter your Mermaid diagram code here...")
            submit_btn = gr.Button("Render")
        with gr.Column():
            image_output = gr.Image()

    submit_btn.click(fn=render_mermaid, inputs=mermaid_input, outputs=image_output)


mrender.launch()