Khal indicator for Waybar

config.json

"custom/events": {
    "format": "{}",
    "tooltip": true,
    "interval": 300,
    "format-icons": {
        "default": ""
    },
    "exec": "waybar-khal.py",
    "return-type": "json"
},

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")

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

output = subprocess.check_output("khal list now "+next_week, shell=True)
output = output.decode("utf-8")

lines = output.split("\n")
new_lines = []
for line in lines:
    clean_line = escape(line).split(" ::")[0]
    if len(clean_line) and not clean_line[0] in ['0', '1', '2']:
        clean_line = "\n<b>"+clean_line+"</b>"
    new_lines.append(clean_line)
output = "\n".join(new_lines).strip()

if today in output:
    data['text'] = " " + output.split('\n')[1]
else:
    data['text'] = ""

data['tooltip'] = output

print(json.dumps(data))

Hi, I really liked your code but for me it had some problems with notes on appointments. The time format I'm using is also different which stopped the code from working at first. I looked through the khal docs and found the --format option. This allows you from the beginning to only print what you want in the end. datetime stuff was fixed by just using now and 7days.
This is my new code:

#!/usr/bin/env python
import json
import subprocess
data = {}
output = subprocess.check_output("khal list now 7days --format \"{start-end-time-style} {title}\"", shell=True).decode("utf-8")
lines = output.split("\n")
new_lines = []
for line in lines:
    if len(line) and line[0].isalpha():
        line = "\n<b>"+line+"</b>"
    new_lines.append(line)
output = "\n".join(new_lines).strip()
if "Today" in output:
    data['text'] = " " + output.split('\n')[1]
else:
    data['text'] = ""
data['tooltip'] = output
print(json.dumps(data))

I hope this can be useful to someone. Let me know what you think, I'm kinda new to python ;)