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#!/usr/bin/env python3
# Script Dependencies:
# fpdf2
# livereload
# xreload
import asyncio, logging, sys
from traceback import print_exc
from fpdf import FPDF
from livereload.watcher import get_watcher_class
from xreload import xreload
OUT_FILEPATH = "fpdf2-demo.pdf"
def build_pdf():
pdf = FPDF()
pdf.set_font("Helvetica", size=16)
pdf.add_page()
pdf.y += 50
pdf.multi_cell(
h=10,
w=0,
align="C",
text="""Hello fpdf2 user!
Launch this script with --watch
and then try to modify this text while the script is running""",
)
pdf.output(OUT_FILEPATH)
print(f"{OUT_FILEPATH} has been rebuilt")
async def start_watch_and_rebuild():
logging.basicConfig(
format="%(asctime)s %(name)s [%(levelname)s] %(message)s",
datefmt="%H:%M:%S",
level=logging.INFO,
)
logging.getLogger("livereload").setLevel(logging.INFO)
watcher = get_watcher_class()()
watcher.watch(__file__, build_pdf)
print("Watcher started...")
await watch_periodically(watcher)
async def watch_periodically(watcher, delay_secs=0.8):
try:
watcher.examine()
except Exception:
print_exc()
await asyncio.sleep(delay_secs)
xreload(sys.modules[__name__], new_annotations={"XRELOADED": True})
await asyncio.create_task(watch_periodically(watcher))
# This conditional ensure that the code below
# does not get executed when calling xreload on this module:
if not __annotations__.get("XRELOADED"):
build_pdf()
# The --watch mode is very handy when using a PDF reader
# that performs hot-reloading, like Sumatra PDF Reader:
if "--watch" in sys.argv:
asyncio.run(start_watch_and_rebuild())
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