config_sway/bin/waybar_khal.py

#!/usr/bin/env python
import subprocess
import datetime
import json
from html import escape

data = {}

today = datetime.date.today().strftime("%Y-%m-%d")
days = [ "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday", "Today",
        "Tomorrow" ]

next_week = (datetime.date.today() + datetime.timedelta(days=10)).strftime("%Y-%m-%d")

title = subprocess.check_output("khal list --format \"{title}\" now "+next_week,
        shell=True).decode("UTF-8").split("\n")
start = subprocess.check_output("khal list --format \"{start}\" now "+next_week,
        shell=True).decode("UTF-8").split("\n")
end = subprocess.check_output("khal list --format \"{end}\" now "+next_week,
        shell=True).decode("UTF-8").split("\n")

lines = ""
for i in range(len(title)):
    t = escape(title[i])
    s = escape(start[i])
    e = escape(end[i])
    line = ""
    if len(t) and t.split(",")[0] in days:
        line = f"\n<b>{t}</b>"
    else:
        ss = s.split(" ")
        es = e.split(" ")
        if len(es) == 1 or len(ss) == 1:
            line = f"<i>{t}</i>"
        else:
            line = f"{ss[1]} - {es[1]}: {t}"

    lines += f"{line}\n"

if today in lines:
    event = lines.split('\n')[2]
    if len(event) > 30:
        event = f"{event[0:30]}…"
    data["text"] = f"{event}"
    data["alt"] = "event"
else:
    data["text"] = "-"
    data["alt"] = "idle"
data["tooltip"] = lines

print(json.dumps(data))