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# app.py
import streamlit as st
import json
from pathlib import Path
from datetime import datetime
import uuid
DATA_FILE = Path("tasks.json")
def load_tasks():
if DATA_FILE.exists():
try:
return json.loads(DATA_FILE.read_text())
except Exception:
return []
return []
def save_tasks(tasks):
try:
DATA_FILE.write_text(json.dumps(tasks, indent=2))
except Exception:
pass
if "tasks" not in st.session_state:
st.session_state.tasks = load_tasks()
st.set_page_config(page_title="Simple Todo", layout="centered")
st.title("📝 Simple Todo App")
# Add task form
with st.form("add_task", clear_on_submit=True):
new_task = st.text_input("New task")
submitted = st.form_submit_button("Add")
if submitted and new_task.strip():
st.session_state.tasks.append({
"id": str(uuid.uuid4()),
"text": new_task.strip(),
"done": False,
"created": datetime.utcnow().isoformat()
})
save_tasks(st.session_state.tasks)
st.success("Added")
# Summary
col1, col2, col3 = st.columns([1,1,1])
total = len(st.session_state.tasks)
done = sum(1 for t in st.session_state.tasks if t["done"])
col1.metric("Total", total)
col2.metric("Completed", done)
if col3.button("Clear completed"):
st.session_state.tasks = [t for t in st.session_state.tasks if not t["done"]]
save_tasks(st.session_state.tasks)
st.markdown("---")
# Filter
filter_opt = st.radio("Show", ("All", "Active", "Completed"), horizontal=True)
# Display tasks (with per-row actions)
if total == 0:
st.info("No tasks yet — add one above!")
else:
for idx, task in enumerate(list(st.session_state.tasks)):
if filter_opt == "Active" and task["done"]:
continue
if filter_opt == "Completed" and not task["done"]:
continue
cols = st.columns([0.05, 0.7, 0.15, 0.1])
checked = cols[0].checkbox("", value=task["done"], key=f"chk_{task['id']}")
if checked != task["done"]:
st.session_state.tasks[idx]["done"] = checked
save_tasks(st.session_state.tasks)
txt = task["text"]
if task["done"]:
cols[1].markdown(f"~~{txt}~~")
else:
cols[1].markdown(txt)
cols[2].markdown(task["created"][:10])
if cols[3].button("Delete", key=f"del_{task['id']}"):
st.session_state.tasks.pop(idx)
save_tasks(st.session_state.tasks)
st.experimental_rerun()
st.markdown("---")
c1, c2 = st.columns(2)
if c1.button("Save to file"):
save_tasks(st.session_state.tasks)
st.success("Saved")
if c2.button("Reload from file"):
st.session_state.tasks = load_tasks()
st.success("Reloaded") |