tzdump.py

#!/usr/bin/env python3

import sys
import csv
from typing import List

filename = "/usr/share/zoneinfo/tzdata.zi"
if len(sys.argv) == 2:
    filename = sys.argv[1]

def tzdata_filter(line: str) -> bool:
    """Filter tzdata.zi file for zones"""
    if line and line[0] == 'Z' :
        return True
    return False

timezones : List[str] = []
with open(filename) as zonetab:
    reader = csv.reader(filter(tzdata_filter, zonetab), delimiter=' ')

    for row in reader:
        timezones.append(row[1])

print('package main')
print()
print('// auto-generated by tzdump.py. DO NOT EDIT')
print()
print('// Timezones is a list of available timezones')
print('var Timezones = []string{')
for tz in timezones:
    print('\t"{}",'.format(tz))
print('}')
print()

# Prepare array with cities/locations only for fuzzy matching
print('// Locations is a list of locations without continent/ocean for fuzzy matching')
print('// index in Locations must match index in Timezones')
print('var Locations = []string{')
for tz in timezones:
    x = tz.split('/')
    loc = x[-1]
    loc = loc.replace('_', ' ')
    print('\t"{}",'.format(loc))
print('}')