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from __future__ import annotations
import subprocess
import tempfile
import time
import uuid
from pathlib import Path
from flask import Flask, render_template, request, send_from_directory, url_for
from werkzeug.utils import secure_filename
app = Flask(__name__)
BASE_DIR = Path(__file__).resolve().parent
GENERATED_DIR = BASE_DIR / "generated"
UPLOADS_DIR = BASE_DIR / "uploads"
LATEX_TEMPLATE = BASE_DIR / "latex" / "template.tex"
GENERATED_DIR.mkdir(parents=True, exist_ok=True)
UPLOADS_DIR.mkdir(parents=True, exist_ok=True)
ALLOWED_IMAGE_EXTENSIONS = {"png", "jpg", "jpeg", "gif", "webp", "svg"}
PAPER_SIZES = {
"a4paper": "A4",
"letterpaper": "US Letter",
"legalpaper": "US Legal",
}
MARGINS = {
"0.75in": "Narrow (0.75in)",
"1in": "Normal (1in)",
"1.25in": "Comfort (1.25in)",
"1.5in": "Wide (1.5in)",
}
MAIN_FONTS = {
"serif": "TeX Gyre Pagella",
"sans": "TeX Gyre Heros",
}
def _pick(options: dict[str, str], key: str, default_key: str) -> str:
if key in options:
return key
return default_key
def _is_allowed_image(filename: str) -> bool:
if "." not in filename:
return False
extension = filename.rsplit(".", 1)[1].lower()
return extension in ALLOWED_IMAGE_EXTENSIONS
@app.get("/")
def index():
return render_template(
"index.html",
paper_sizes=PAPER_SIZES,
margins=MARGINS,
)
@app.post("/convert")
def convert_markdown():
markdown = request.form.get("markdown", "").strip()
if not markdown:
return render_template("partials/error.html", message="Markdown content is required."), 400
paper_size_key = _pick(PAPER_SIZES, request.form.get("paper_size", ""), "a4paper")
margin_key = _pick(MARGINS, request.form.get("margin", ""), "1in")
main_family_key = request.form.get("main_font", "serif")
if main_family_key not in MAIN_FONTS:
main_family_key = "serif"
epoch = int(time.time())
unique_id = uuid.uuid4().hex
output_name = f"likha-pdf_{epoch}_{unique_id}.pdf"
output_path = GENERATED_DIR / output_name
with tempfile.TemporaryDirectory() as tmp_dir:
temp_markdown = Path(tmp_dir) / "source.md"
temp_markdown.write_text(markdown, encoding="utf-8")
command = [
"pandoc",
str(temp_markdown),
"--from",
"markdown+emoji",
"--pdf-engine=lualatex",
"--template",
str(LATEX_TEMPLATE),
"-V",
f"papersize={paper_size_key}",
"-V",
f"margin={margin_key}",
"-V",
f"mainfont={MAIN_FONTS[main_family_key]}",
"--resource-path",
f"{BASE_DIR}:{UPLOADS_DIR}:{tmp_dir}",
"-o",
str(output_path),
]
try:
subprocess.run(command, check=True, capture_output=True, text=True)
except FileNotFoundError:
return (
render_template(
"partials/error.html",
message="Pandoc is not installed or not in PATH.",
),
500,
)
except subprocess.CalledProcessError as exc:
stderr = (exc.stderr or "").strip()
error_message = stderr[-1200:] if stderr else "PDF conversion failed."
return render_template("partials/error.html", message=error_message), 400
return render_template(
"partials/result.html",
download_url=url_for("download_pdf", filename=output_name),
filename=output_name,
)
@app.post("/upload-image")
def upload_image():
image = request.files.get("image")
if image is None or image.filename is None or not image.filename.strip():
return render_template("partials/upload_error.html", message="image file is required."), 400
original_name = secure_filename(image.filename)
if not original_name or not _is_allowed_image(original_name):
return render_template("partials/upload_error.html", message="unsupported image type."), 400
extension = original_name.rsplit(".", 1)[1].lower()
epoch = int(time.time())
unique_id = uuid.uuid4().hex
stored_name = f"img_{epoch}_{unique_id}.{extension}"
image_path = UPLOADS_DIR / stored_name
image.save(image_path)
markdown_snippet = f" / stored_name).as_posix()})"
return render_template(
"partials/upload_result.html",
filename=stored_name,
markdown_snippet=markdown_snippet,
preview_url=url_for("uploaded_image", filename=stored_name),
)
@app.get("/uploads/<path:filename>")
def uploaded_image(filename: str):
return send_from_directory(UPLOADS_DIR, filename)
@app.get("/download/<path:filename>")
def download_pdf(filename: str):
return send_from_directory(GENERATED_DIR, filename, as_attachment=True)
if __name__ == "__main__":
app.run(host="0.0.0.0", port=5000, debug=False)
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