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import sys
import subprocess
from pathlib import Path
from os import getenv
from importlib.metadata import version
from PIL import Image
from minijinja import Environment
import gradio as gr
# Config
document_name = "document-template.typ"
do_share = getenv("DO_SHARE")
concurrency_limit = getenv("CONCURRENCY_LIMIT", 1)
typst_bin_path = getenv("TYPST_BIN", "/home/user/app/typst")
# App description
title = "Typst-based PDF generation"
examples = [
"""
I begin this story with a neutral statement.
Basically this is a very silly test.
""",
]
description_head = f"""
# {title}
## Overview
We use https://typst.app to generate a PDF file with some parameters from this Gradio app.
""".strip()
tech_env = f"""
#### Environment
- Python: {sys.version}
""".strip()
def app_version(bin_path):
return subprocess.run([bin_path, "--version"], capture_output=True, text=True)
def typst_compile(typst_bin_path, filename, export_template):
args = [typst_bin_path, "compile", filename, export_template]
print("Running:", args)
return subprocess.run(
args,
capture_output=False,
)
def convert_document(bin_paths, text):
print("Converting...")
env = Environment(
templates={
"document": Path("document-template.typ").read_text(),
}
)
formatted_document = env.render_template("document", text=text)
# Write the rendered document to a temporary file
document_file = Path("document.typ")
document_file.write_text(formatted_document)
# Compile the .typ file to a .pdf file
c = typst_compile(bin_paths["typst"], "document.typ", "document.pdf")
if c.returncode != 0:
raise gr.Error("Typst compilation failed.")
print("Result:", c)
# Extract the first page of the PDF file
c = typst_compile(bin_paths["typst"], "document.typ", "file-{n}.png")
if c.returncode != 0:
raise gr.Error("Typst exporting to PNGs failed.")
print("Result:", c)
first_page = Path("file-1.png")
if not first_page.exists():
raise gr.Error("The first page has not been exported.")
# Move the image to an object
image = Image.open(first_page.absolute())
# Remove the temporary files
first_page.unlink(missing_ok=True)
document_file.unlink(missing_ok=True)
return image
typst_version_info = app_version(typst_bin_path)
if typst_version_info.returncode != 0:
print("Error: Typst version command failed.")
exit(1)
r_tech_env = f"""
#### Typst Environment
```
{typst_version_info.stdout.strip()}
```
""".strip()
tech_libraries = f"""
#### Libraries
- gradio: {version("gradio")}
""".strip()
def generate_pdf(text, progress=gr.Progress()):
if not text:
raise gr.Error("Please paste your text.")
# Remove the previous PDF file and Typst file
Path("document.pdf").unlink(missing_ok=True)
Path("document.typ").unlink(missing_ok=True)
gr.Info("Generating the PDF document", duration=1)
bin_paths = {
"typst": typst_bin_path,
}
image = convert_document(bin_paths, text)
gr.Success("Finished!", duration=2)
pdf_file = gr.DownloadButton(
label="Download document.pdf",
value="./document.pdf",
visible=True,
)
return [image, pdf_file]
demo = gr.Blocks(
title=title,
analytics_enabled=False,
theme=gr.themes.Base(),
)
with demo:
gr.Markdown(description_head)
gr.Markdown("## Usage")
with gr.Row():
text = gr.Textbox(label="Text", autofocus=True, max_lines=50)
with gr.Column():
pdf_file = gr.DownloadButton(label="Download PDF", visible=False)
preview_image = gr.Image(
label="Preview image",
)
gr.Button("Generate").click(
generate_pdf,
concurrency_limit=concurrency_limit,
inputs=text,
outputs=[preview_image, pdf_file],
)
with gr.Row():
gr.Examples(label="Choose an example", inputs=text, examples=examples)
gr.Markdown("### Gradio app uses:")
gr.Markdown(tech_env)
gr.Markdown(r_tech_env)
gr.Markdown(tech_libraries)
if __name__ == "__main__":
demo.queue()
if do_share:
demo.launch(share=True)
else:
demo.launch()
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