A minimal streamlit app for an svg2pdf converter

st_svg2pdf_app.py

"""
Run with:

   $ streamlit run st_svg2pdf_app.py
"""

import base64
import os
import subprocess
import tempfile

import streamlit as st
import svglib


# config

st.set_page_config(
    page_title="SVG to PDF Converter",
    layout="wide",
    initial_sidebar_state="auto",
)

# sidebar

st.sidebar.header("Settings")
svg_path = st.sidebar.text_input("SVG File Path")
if st.sidebar.button("Read"):
    pass

# main 

st.title('SVG to PDF')

st.markdown(
    "An experimental [streamlit.io](https://streamlit.io) UI "
    "for [svg2pdf](https://github.com/deeplook/svglib) (based "
    "on [reportlab.com](https://reportlab.com))."
)

pdf_path = ""
col1, col2 = st.beta_columns(2)
with col1:
    with st.beta_expander("SVG"):
        svg_code = ""
        if svg_path:
            svg_code = open(svg_path).read()
        svg = st.text_area("Code", value=svg_code, height=400)
        st.markdown(
            "Paste SVG code above or edit it and click below "
            "to convert it!"
        )
        if st.button("Convert", key=2):
            if svg:
                svg_tmp_path = tempfile.mktemp(suffix=".svg")
                with open(svg_tmp_path, "w") as f:
                    f.write(svg)
                pdf_path = os.path.splitext(svg_tmp_path)[0] + ".pdf"
                subprocess.check_call(["svg2pdf", svg_tmp_path])
with col2:
    with st.beta_expander("PDF"):
        if pdf_path:
            pdf_content = open(pdf_path, "rb").read()
            base64_pdf = base64.b64encode(pdf_content).decode("utf-8")
            pdf_display = (
                f'<embed src="data:application/pdf;base64,{base64_pdf}" '
                'width="500" height="400" type="application/pdf">'
            )
            st.markdown(pdf_display, unsafe_allow_html=True)